CA2315407A1 - Method and apparatus for sewage water treatment using the biological activating system - Google Patents
Method and apparatus for sewage water treatment using the biological activating system Download PDFInfo
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- CA2315407A1 CA2315407A1 CA 2315407 CA2315407A CA2315407A1 CA 2315407 A1 CA2315407 A1 CA 2315407A1 CA 2315407 CA2315407 CA 2315407 CA 2315407 A CA2315407 A CA 2315407A CA 2315407 A1 CA2315407 A1 CA 2315407A1
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- activation
- sewage water
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- aeration
- sludge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
A two-stage sewage water treatment plant using a biological activating system with suspended activated sludge, formed by a storage tank with sewage water inlet, air pump pumping raw water into the activation tank and emergency level indicator, the activation thank with aeration equipment and air pump being designed to fill the post-sedimentation tank provided with the clear water outlet. The activation tank (2) is provided with sludge drainage air pump (12) designed to pump excessive sludge into the sludge box (19), provided with the aeration device (20), connected with the aeration device (10) of the activation tank (2) to form one branch of the aeration system, while the storage tank (1) is provided with aeration device (3) of the second branch of the aeration system, both branches being connected with the changeover switch. And a method for sewage water treatment.
Description
Method and apparatus for sewage water treatment using the biological activating system Technical Field The invention relates to the method and apparatus for sewage water treatment using the biological activating system with suspended activated sludge, suitable in particultir for small domestic sewage water treatment plants.
gac round Art The biological method of sewage water treatment consists in utilizing the activated sludge formed by a mixture of various bacteria and small microorganisms. For its existence;
this sludge needs organic substances contained in sewage water which is decomposed and thus cleared by these substances. The activatipg process is only possible when there is suffcient oxygen introduced as a mle by blowing air into the activation tank The sewage water treatment plants using the suspended activated sludge method known hitherto can be generally divided into systems using a continuous sewage water passage through the activation tank, and systems using a discontinuous or intermittent passage. In the continuous sewage wafer treatment systems, the. sewage water is supplied after its coarse pre-treatment to the activation tank and, after a technologically necessitated period needed for its clearing, drained to a separate post-sedimentation tank together with the activated sludge. In this tank, 2 0 the sludge is finally separated by sedimentation and the cleared water is drained away.
In the system using the discontinuous sewage water passage, the sewage water is supplied to the activation tank in cycles. The water treatment cycle starts once the activation tank is filled and comes to an end when the aeration is intemtpted, the sludge settles on the bottom of the activation tank and the cleared water is eventually drained away. When the activation tank is empty, the cycle is terminated arid a new one starts with the activation tank refilling. This means that in this case the system does not contain the post-sedimentation tank.
Small domestic sewage water treatment plants operate in a situation where the sewage water inlet is non-uniform, mostly during morning and evening hours, and at.
the same time the sewage wafer quality is very varied. This causes diflicultiea in the process of water ri-eattuent carried out in common domestic sewage water treatment plants, particularly icl the 0 systems using the continuous sewage water passage through the activation tank Disclosure of lnventlon The above stated disadvantages are overcome by the method and apparatus for the sewage water treatment according to the present invention, whereby the sewage water flows into the storage tank which serves at the same time as the equalizing tank Sewage water is homogenized and pre-treated in this tank. The sewage water without large impurities is pumped continuously by the air pump iato the activation tarok where the water treatment is completed. The mixture of the cleared sewage water and the sludge is pumped by the air pump into the post-sedimentation tank which is inserted in the activation tank, thus forming Z
its -part. One part of the sludge and cleared: water mixture flaws out through the outlet in the bottom of the post-sedimentation tank getting back to the activation tank and the part without the sludge sedunent rises to the surface of the past-sedimentation tank being drained to the cleared water outlet.
The invention is based on the feet that the activation and the storage tanks are aerated alternately so that simultaneous aeration never occurs. The aeration switching-over betwaan the storage and the activation tanks, that is between the first and the second activation stages, is either set at fixed time intervals, or depends on the sewage water level in the storage tank.
The aeration of the activation tank takes place at the same time as the aeration of the sludge box. In case the sewage water volume in the storage tank raa~ches the maximum level setting, the change-over switch is disconnected and the sewage water treatment plant operates using the second activation stage. When the sewage water volume in the storage tank drops below tll~s cnaxi~nmti level setting, the plant st.u~ts operatcng ag:~ri~ lIl the alterzrsu.ing, switch-over mode.
The two-stage sewage water treatment plant using the biological activating system with suspended activated sludge as defined by the present invention is formed by a storage tank with a sewage water inlet, an aeration device and maximum and emergency level indicators. The sewage water is pumped from this tank with a raw water air pump into the activation tank which contains an aeration device and an air pump designed for filling the post-sedimentation tank provided with a cleared water outlet. The activation tank is also provided with a sludge air pump which pumps the excessive sludge away into the aerated sludge box. The sludge box aeration together with the activation tank aeration form one bc-anch of the aeration system. The second branch of the aeration system is formed by the 2 0 ~°~e ~k aeration. The alternating activation of both aeration system branches is controlled by a change-over switch formed either by a time switch or a level switch sikuated in the storage tank In case it is formed by a time switch, the. storage tank is provided with a maximum level indicator designed to block the aeration of this tank. The post-sedimentation tank is provided with an air pump for floating impurities, activated only during the time of the storage tank aeration.
Each of the sewage water treatment plant tanks has specific qualities which, combined together, forma high utility value equipment with minimum operating requirements.
The advantage of the sewage water treatment plant constructed as described by the present invention is its high operating reliability, minimum maintenance requirements, suitability for intermittent operation of recreational facilities and high resistance to impact load and to varying sewage water quality. Impact inflows accumulate by the activation tank 30 inlet being gca~dualty pumped into this tank. In this way the activation tank, as well as the post-sedimentation tank are protected against hydraulic overload, thus allowing to achieve a better quality sewage water treatment. Also the capacity of the post-sedimentation tank is smaller in coirtpwi~m with the commonly known sewage water tt~eutment platats not equipped with the equaliaang tank.
Switching over the aeration results in alternating aerobic and anaerobic (anoxic) conditions which is highly suitable for the biological characteristics of tha activated sludge.
At the same time the activated sludge in the torage tank becomes highly concentrated fa~ciiitating the sewage water pre-treatment and elimination of various chemicals used in households t~rhich..co~l:d..affeet the. quality of the. cleaning,process under way in he activation . .
Large impurities. which get trapped in the storage teak can remain there even for a longer time. Since this tank is aerated in an intermittent way, the impurities undergo a gradual organic decomposition. If there are substances which are not biodegradable, mechanical means must be used to remove them from the storage tank: Duriag idle time, when the storage tank is not being aerated, denitrification processes take place, that is the decomposition of nitrates in the cleared water regularly pumped into this tank from the activation teak.
. Another advantage is the fact that the raw water air pump, the so-called mammoth pump or air-lift pump, increases its capacity according to the immersion depth, that is according to the quantity of sewage water in the storage tank. As a result, should there be an invpact load of sewage vvatei~ i.~flow or a long-lasting iucreaaed inflow, the raw water pump capacity gradually increases up to five times.
The post-sedimentation tank is designed without bottom and instead of the usual position of the air pump by the post-sedimentation tank bottom, the post-sedimentation tank in this case is f fled through a deaerator and floating impurities catch pit.
The advantage of this arrangement is that even when the sewage water treatment plant is out of operation for a longer period of time, the equipment remains functional and the post-sedimentation tank bottom does not get clogged by the sludge.
Another advantage of the sewage water treatment plant as described by the present invention is the withdrawal of the floating sludge and impurities f~om the post-sedimentation tank surface. The advantage of this two tank system consists in that the exhaustion device, the 20 mr-lift; pump, starts ncnning as soon as the Ireatmentplant operating mode is switched over. In this case the sludge, rising from the post-sedimentation tank bottom towards the outlet, cannot flow out as the cleared water outflow does not occur either.
An outstanding operating advantage is the separate sludge box with sludge aeration and aerobe stabilization. The activation tank aeration takes place at the same time as the sludge box aeration. During the storage tank aeration the sludge is removed from the activation tank, the sludge box is not aerated, the sludge settles there and the excessive water overflows into the equalizing tank.
Further benef t of the treatment plant design is the fact that all pumps used are air pumps and the power drive of the entire sewage water treatment plant is provided by one or two compressors the power being distributed to individual devices through calibrated nozzles not requiring any adjustments.
~0 Brief description of Drawin~~
One of the possible implementations of the sewage water activation treatment plant described by the present invention is shown in the attached drawings. Fig. 1 illustrates the ground plan of the water treatmznt plant, Fig. 2 shows the principal plant diagram, namely the version with the time switch. Fig. 3 illustrates the implementation of the storage tank z~rith the float switch while alternative possibilities of implementing the aeration system are shown in Fig. d. and 5.
Description of preferred'$mbodiment The tvc~o-stage activation-type sewage water treatment plant as.illustrated by Fig. 1 and 2 ig formed by the storage ;tank l, activation tank 2, post-sedimentation tank 15 and sludge box 19. The storage tank 1 is provided with the aeration system 3; formed by raw water air-lift pump 4, the so called rriammoth pump, eorltaining large impurities filter 5.
Furthermore it contains the sewage water inlet 6, blocking level indicator 9 and emergency level indicator 8 for sound and light signalling: The activation tank 2 is provided with the aeration device 10, at the raw water inlet with floating impurities catch pit 11, sludge air pump 12 and post-sedimentation tank air pump 13 with floating impurities catch pit 14. The post-sedirilentation tank 15 is provided with an opening 1S in the boftam and cIeai- water drainage 17, ended with the clear wfltes° outlet pipes 7 with -a safety overflow and safety overflow scumboard and, furthermore, with the air pump 18 designed to pump away floating impurities.
Besides that the sewage water treatment pant comprises the sludge box 19 with the aeration device 20, used alternately for sludge :drainage. The aeration device ~0 is formed by the sir-lift pump whose delivery pipe is closed at the outlet. Thus the air supply passes through the inlet opening of the air-lift pump delivery pipe into the sludge box 19 aerating and stirring its content. In case the sludge needs to be drained away from the sludge box 19, the pressure hose outlet ofthe air-lift pump opens interrupting the sludge box 19 aeration and stirring; and the air-lift pump then performs its primary function, that is, in this case, pumping off the sludge. As illustrated by Fi:g. 3, the sewage water h~entment plant also contains the aeration device foi~ed by one compressor 2I and two electrova(ves 22, 23 with air distributors 24, 25, -or, as shown in Fig.:S, only with-one three-way electrovalve 30. Another alternative is the aeration device illustrated in Fig. 4 which is formed by tvvo compressors 27, 28 with air distributors without electrovalves. The last but not least is the electrical distributor with the 2 o time switch 26 which may be replaced by the level indicator switch 34, as shown is Fig. 3.
Sewage water is supplied to the equalizing tank 1 via the sewage water inlet 6 and continuously pumped offby the raw water air pump 4 through the floating impurities catch pit _l l to the activation tank 2 where it is treated in the second activation stags. At the same time, the post-sedimentation tank air pump 13 constantly pumps the mixture of cleared sewage water and sludge via the floating impurities catch pit 14 into the post-sedimentation tank 15.
A bigger part of the sewage water and sludge mixture passes through the bottom opening 16 in the post-sedimentation tank 13 getting back to the activation tank 2. Some of the cleared sev~~age water, the quantity ofvvhich corresponds to the immediate capacity of the ravr~ water air-lift pump 4 flows out from the post-sedimentation tank 15 by the cleared water drainage 1? to the clean water drainage tube 7. What also occurs at this stage is the sludge box 19 aeration provided by the aeration device 20. At the same time the large impurities filter S at the inlet of the raw water air pump 4, is cleaned by an air flow: The compressor 21 with the 3 0 open electrovalve 23 and/or the compressor 27 are in operation. Having passed the time set for the actlVflttOfl tank 2 aeration, usually in Ehe intetvai between two and ten hoeu~s, the electrical distributor with the time switch 26 interl-upts the activation'tank 2 aet-ation turning on the storage tank 1 aeration and excessive sludge drainage from the activation tank 2 to the sludge box 19. In this way, the first activation stage ie put into operation.
The storage tank 1 aeration lasts for the duration of the pre-set time, usually from half an hour to two hours, and after that the operating mode of the sewage water tt~eatcnent plant is switched over again restarting the activation tank 2 and sludge box 19 aeration. . In ' the system comprising one compressor 21 and twv electrovalves 22, 23, the time switch _26 switches over the electrovalves -in such a way that air is alternately supplied to the air distributor 24 carving the actiYation : tank aor- to . she .sicr. distributor . 25; serving. the storage:. tank 1: > This . intermittent aeration of the first and the second activation stages takes.place continuously for the duration of the whole 24-hour period. In case the two .coypressors 27; 28 are in use, the time switch 2G
turns on alternately the acorapressor 27 with the air distributor 24 providing; the activation tank 2 aeration and the compressor 28 with the sir distributor 25 providing the equalizing tank 1 aeration and/or switches over the three-way valve 30. If there is an increase in the sewage water inflow and the water ire the storage tank 1 rises as high as the blocking level setting 29, the level indicator 9 blocks the switchover of the treatment plant operating mode in order to prevent any further increase .iri the equalizing tank 1 water level as a result of back pumping.
Should the storage tank 1 level continue to rise, the emergency level switch 8 turns on the sound and light signals. Once the sewage water level in the storage tank 1 drops below the blacking level setting 29, the electrical distributor with the time switch 2G
is unblocked and the sewage water treatment plant starts operating again in the alternating mode, as indicated ~ove_ In case the changeover switch function is performed by the level indicator switch 34, situated in the storage tank l and connected with the electrical distributor 31, the aeration changeover occurs depending on the storage tank 1 level. If the storage tank -1 level does not drop below the minimum level setting 32, continuous activation in the activation tank 2 takes place, the sludge box 19 is aerated at the same time and the cleared sewage water and sludge mixture is pumped continuously into the post-sedimentation tank 15 and subsequently into the outlet tube 7. Should the level in the storage tank 1 drop below the minimum level setting 32, the level indicator switch 34 switches the sewage water treatment plant into the first activation stage. When the storage tank level rises exceeding the switchover level setting 33, due to additional sewage water inflow, the plant switches over back to the second activation stage.
2 0 All large impurities are, held up in the storage tank 1 where they can remain even for a Longer period of time. Due to the intermittent aeration, these impurities undergo a gradual organic decomposition: If there are substances which are not biodegradable, mechanical means must be used to remove them from the storage tank 1. During idle time, when the storage tank 1 is not being aerated, denitrification processes take place, that is the decomposition of nitrates in the cleared water regularly pumped into this tank from the activation tank 2:
gac round Art The biological method of sewage water treatment consists in utilizing the activated sludge formed by a mixture of various bacteria and small microorganisms. For its existence;
this sludge needs organic substances contained in sewage water which is decomposed and thus cleared by these substances. The activatipg process is only possible when there is suffcient oxygen introduced as a mle by blowing air into the activation tank The sewage water treatment plants using the suspended activated sludge method known hitherto can be generally divided into systems using a continuous sewage water passage through the activation tank, and systems using a discontinuous or intermittent passage. In the continuous sewage wafer treatment systems, the. sewage water is supplied after its coarse pre-treatment to the activation tank and, after a technologically necessitated period needed for its clearing, drained to a separate post-sedimentation tank together with the activated sludge. In this tank, 2 0 the sludge is finally separated by sedimentation and the cleared water is drained away.
In the system using the discontinuous sewage water passage, the sewage water is supplied to the activation tank in cycles. The water treatment cycle starts once the activation tank is filled and comes to an end when the aeration is intemtpted, the sludge settles on the bottom of the activation tank and the cleared water is eventually drained away. When the activation tank is empty, the cycle is terminated arid a new one starts with the activation tank refilling. This means that in this case the system does not contain the post-sedimentation tank.
Small domestic sewage water treatment plants operate in a situation where the sewage water inlet is non-uniform, mostly during morning and evening hours, and at.
the same time the sewage wafer quality is very varied. This causes diflicultiea in the process of water ri-eattuent carried out in common domestic sewage water treatment plants, particularly icl the 0 systems using the continuous sewage water passage through the activation tank Disclosure of lnventlon The above stated disadvantages are overcome by the method and apparatus for the sewage water treatment according to the present invention, whereby the sewage water flows into the storage tank which serves at the same time as the equalizing tank Sewage water is homogenized and pre-treated in this tank. The sewage water without large impurities is pumped continuously by the air pump iato the activation tarok where the water treatment is completed. The mixture of the cleared sewage water and the sludge is pumped by the air pump into the post-sedimentation tank which is inserted in the activation tank, thus forming Z
its -part. One part of the sludge and cleared: water mixture flaws out through the outlet in the bottom of the post-sedimentation tank getting back to the activation tank and the part without the sludge sedunent rises to the surface of the past-sedimentation tank being drained to the cleared water outlet.
The invention is based on the feet that the activation and the storage tanks are aerated alternately so that simultaneous aeration never occurs. The aeration switching-over betwaan the storage and the activation tanks, that is between the first and the second activation stages, is either set at fixed time intervals, or depends on the sewage water level in the storage tank.
The aeration of the activation tank takes place at the same time as the aeration of the sludge box. In case the sewage water volume in the storage tank raa~ches the maximum level setting, the change-over switch is disconnected and the sewage water treatment plant operates using the second activation stage. When the sewage water volume in the storage tank drops below tll~s cnaxi~nmti level setting, the plant st.u~ts operatcng ag:~ri~ lIl the alterzrsu.ing, switch-over mode.
The two-stage sewage water treatment plant using the biological activating system with suspended activated sludge as defined by the present invention is formed by a storage tank with a sewage water inlet, an aeration device and maximum and emergency level indicators. The sewage water is pumped from this tank with a raw water air pump into the activation tank which contains an aeration device and an air pump designed for filling the post-sedimentation tank provided with a cleared water outlet. The activation tank is also provided with a sludge air pump which pumps the excessive sludge away into the aerated sludge box. The sludge box aeration together with the activation tank aeration form one bc-anch of the aeration system. The second branch of the aeration system is formed by the 2 0 ~°~e ~k aeration. The alternating activation of both aeration system branches is controlled by a change-over switch formed either by a time switch or a level switch sikuated in the storage tank In case it is formed by a time switch, the. storage tank is provided with a maximum level indicator designed to block the aeration of this tank. The post-sedimentation tank is provided with an air pump for floating impurities, activated only during the time of the storage tank aeration.
Each of the sewage water treatment plant tanks has specific qualities which, combined together, forma high utility value equipment with minimum operating requirements.
The advantage of the sewage water treatment plant constructed as described by the present invention is its high operating reliability, minimum maintenance requirements, suitability for intermittent operation of recreational facilities and high resistance to impact load and to varying sewage water quality. Impact inflows accumulate by the activation tank 30 inlet being gca~dualty pumped into this tank. In this way the activation tank, as well as the post-sedimentation tank are protected against hydraulic overload, thus allowing to achieve a better quality sewage water treatment. Also the capacity of the post-sedimentation tank is smaller in coirtpwi~m with the commonly known sewage water tt~eutment platats not equipped with the equaliaang tank.
Switching over the aeration results in alternating aerobic and anaerobic (anoxic) conditions which is highly suitable for the biological characteristics of tha activated sludge.
At the same time the activated sludge in the torage tank becomes highly concentrated fa~ciiitating the sewage water pre-treatment and elimination of various chemicals used in households t~rhich..co~l:d..affeet the. quality of the. cleaning,process under way in he activation . .
Large impurities. which get trapped in the storage teak can remain there even for a longer time. Since this tank is aerated in an intermittent way, the impurities undergo a gradual organic decomposition. If there are substances which are not biodegradable, mechanical means must be used to remove them from the storage tank: Duriag idle time, when the storage tank is not being aerated, denitrification processes take place, that is the decomposition of nitrates in the cleared water regularly pumped into this tank from the activation teak.
. Another advantage is the fact that the raw water air pump, the so-called mammoth pump or air-lift pump, increases its capacity according to the immersion depth, that is according to the quantity of sewage water in the storage tank. As a result, should there be an invpact load of sewage vvatei~ i.~flow or a long-lasting iucreaaed inflow, the raw water pump capacity gradually increases up to five times.
The post-sedimentation tank is designed without bottom and instead of the usual position of the air pump by the post-sedimentation tank bottom, the post-sedimentation tank in this case is f fled through a deaerator and floating impurities catch pit.
The advantage of this arrangement is that even when the sewage water treatment plant is out of operation for a longer period of time, the equipment remains functional and the post-sedimentation tank bottom does not get clogged by the sludge.
Another advantage of the sewage water treatment plant as described by the present invention is the withdrawal of the floating sludge and impurities f~om the post-sedimentation tank surface. The advantage of this two tank system consists in that the exhaustion device, the 20 mr-lift; pump, starts ncnning as soon as the Ireatmentplant operating mode is switched over. In this case the sludge, rising from the post-sedimentation tank bottom towards the outlet, cannot flow out as the cleared water outflow does not occur either.
An outstanding operating advantage is the separate sludge box with sludge aeration and aerobe stabilization. The activation tank aeration takes place at the same time as the sludge box aeration. During the storage tank aeration the sludge is removed from the activation tank, the sludge box is not aerated, the sludge settles there and the excessive water overflows into the equalizing tank.
Further benef t of the treatment plant design is the fact that all pumps used are air pumps and the power drive of the entire sewage water treatment plant is provided by one or two compressors the power being distributed to individual devices through calibrated nozzles not requiring any adjustments.
~0 Brief description of Drawin~~
One of the possible implementations of the sewage water activation treatment plant described by the present invention is shown in the attached drawings. Fig. 1 illustrates the ground plan of the water treatmznt plant, Fig. 2 shows the principal plant diagram, namely the version with the time switch. Fig. 3 illustrates the implementation of the storage tank z~rith the float switch while alternative possibilities of implementing the aeration system are shown in Fig. d. and 5.
Description of preferred'$mbodiment The tvc~o-stage activation-type sewage water treatment plant as.illustrated by Fig. 1 and 2 ig formed by the storage ;tank l, activation tank 2, post-sedimentation tank 15 and sludge box 19. The storage tank 1 is provided with the aeration system 3; formed by raw water air-lift pump 4, the so called rriammoth pump, eorltaining large impurities filter 5.
Furthermore it contains the sewage water inlet 6, blocking level indicator 9 and emergency level indicator 8 for sound and light signalling: The activation tank 2 is provided with the aeration device 10, at the raw water inlet with floating impurities catch pit 11, sludge air pump 12 and post-sedimentation tank air pump 13 with floating impurities catch pit 14. The post-sedirilentation tank 15 is provided with an opening 1S in the boftam and cIeai- water drainage 17, ended with the clear wfltes° outlet pipes 7 with -a safety overflow and safety overflow scumboard and, furthermore, with the air pump 18 designed to pump away floating impurities.
Besides that the sewage water treatment pant comprises the sludge box 19 with the aeration device 20, used alternately for sludge :drainage. The aeration device ~0 is formed by the sir-lift pump whose delivery pipe is closed at the outlet. Thus the air supply passes through the inlet opening of the air-lift pump delivery pipe into the sludge box 19 aerating and stirring its content. In case the sludge needs to be drained away from the sludge box 19, the pressure hose outlet ofthe air-lift pump opens interrupting the sludge box 19 aeration and stirring; and the air-lift pump then performs its primary function, that is, in this case, pumping off the sludge. As illustrated by Fi:g. 3, the sewage water h~entment plant also contains the aeration device foi~ed by one compressor 2I and two electrova(ves 22, 23 with air distributors 24, 25, -or, as shown in Fig.:S, only with-one three-way electrovalve 30. Another alternative is the aeration device illustrated in Fig. 4 which is formed by tvvo compressors 27, 28 with air distributors without electrovalves. The last but not least is the electrical distributor with the 2 o time switch 26 which may be replaced by the level indicator switch 34, as shown is Fig. 3.
Sewage water is supplied to the equalizing tank 1 via the sewage water inlet 6 and continuously pumped offby the raw water air pump 4 through the floating impurities catch pit _l l to the activation tank 2 where it is treated in the second activation stags. At the same time, the post-sedimentation tank air pump 13 constantly pumps the mixture of cleared sewage water and sludge via the floating impurities catch pit 14 into the post-sedimentation tank 15.
A bigger part of the sewage water and sludge mixture passes through the bottom opening 16 in the post-sedimentation tank 13 getting back to the activation tank 2. Some of the cleared sev~~age water, the quantity ofvvhich corresponds to the immediate capacity of the ravr~ water air-lift pump 4 flows out from the post-sedimentation tank 15 by the cleared water drainage 1? to the clean water drainage tube 7. What also occurs at this stage is the sludge box 19 aeration provided by the aeration device 20. At the same time the large impurities filter S at the inlet of the raw water air pump 4, is cleaned by an air flow: The compressor 21 with the 3 0 open electrovalve 23 and/or the compressor 27 are in operation. Having passed the time set for the actlVflttOfl tank 2 aeration, usually in Ehe intetvai between two and ten hoeu~s, the electrical distributor with the time switch 26 interl-upts the activation'tank 2 aet-ation turning on the storage tank 1 aeration and excessive sludge drainage from the activation tank 2 to the sludge box 19. In this way, the first activation stage ie put into operation.
The storage tank 1 aeration lasts for the duration of the pre-set time, usually from half an hour to two hours, and after that the operating mode of the sewage water tt~eatcnent plant is switched over again restarting the activation tank 2 and sludge box 19 aeration. . In ' the system comprising one compressor 21 and twv electrovalves 22, 23, the time switch _26 switches over the electrovalves -in such a way that air is alternately supplied to the air distributor 24 carving the actiYation : tank aor- to . she .sicr. distributor . 25; serving. the storage:. tank 1: > This . intermittent aeration of the first and the second activation stages takes.place continuously for the duration of the whole 24-hour period. In case the two .coypressors 27; 28 are in use, the time switch 2G
turns on alternately the acorapressor 27 with the air distributor 24 providing; the activation tank 2 aeration and the compressor 28 with the sir distributor 25 providing the equalizing tank 1 aeration and/or switches over the three-way valve 30. If there is an increase in the sewage water inflow and the water ire the storage tank 1 rises as high as the blocking level setting 29, the level indicator 9 blocks the switchover of the treatment plant operating mode in order to prevent any further increase .iri the equalizing tank 1 water level as a result of back pumping.
Should the storage tank 1 level continue to rise, the emergency level switch 8 turns on the sound and light signals. Once the sewage water level in the storage tank 1 drops below the blacking level setting 29, the electrical distributor with the time switch 2G
is unblocked and the sewage water treatment plant starts operating again in the alternating mode, as indicated ~ove_ In case the changeover switch function is performed by the level indicator switch 34, situated in the storage tank l and connected with the electrical distributor 31, the aeration changeover occurs depending on the storage tank 1 level. If the storage tank -1 level does not drop below the minimum level setting 32, continuous activation in the activation tank 2 takes place, the sludge box 19 is aerated at the same time and the cleared sewage water and sludge mixture is pumped continuously into the post-sedimentation tank 15 and subsequently into the outlet tube 7. Should the level in the storage tank 1 drop below the minimum level setting 32, the level indicator switch 34 switches the sewage water treatment plant into the first activation stage. When the storage tank level rises exceeding the switchover level setting 33, due to additional sewage water inflow, the plant switches over back to the second activation stage.
2 0 All large impurities are, held up in the storage tank 1 where they can remain even for a Longer period of time. Due to the intermittent aeration, these impurities undergo a gradual organic decomposition: If there are substances which are not biodegradable, mechanical means must be used to remove them from the storage tank 1. During idle time, when the storage tank 1 is not being aerated, denitrification processes take place, that is the decomposition of nitrates in the cleared water regularly pumped into this tank from the activation tank 2:
Claims (16)
1. Method for sewage water treatment using the biological activation system with suspended activated sludge where sewage water is activated while passing through the storage, activation and post-sedimentation tanks, characterized in that,the activation and storage tanks are aerated alternately.
2. Method for sewage water treatment according to claim 1, characterized in that, alternating aeration of the activation and storage tanks is carried out in fixed preset time intervals.
3.Method for sewage water treatment according to claim 1 characterized in that, the alternating aeration of the activation and storage tanks occurs depending on the sewage water lever in the storage tank.
4. Method for sewage water treatment according to claims 1 and 2, characterized in that,having been reached the blocking level setting in the storage tank, the alternating aeration is disconnected and the aeration takes place only in the activation tank until sewage water volume in the storage tank drops below this level.
5. Method for sewage water treatment according to claims 1 and 3, characterized in that, having dropped the sewage water volume in the storage tank below the minimum level setting, the activation process taking place in the activation tank is terminated starting the storage tank aeration and at the same time the re-pumping of excessive sludge from the storage tank into the sludge box
6. Method for sewage water treatment according to claims 1 to 5, characterized in that, the aeration takes places simultaneously in the activation tank and the sludge box.
7.Method for sewage water treatment according to claims 1 to 6, characterized in that, the post-sedimentation tank, connected with the activation tank by an opening in the bottom, is filled from the activation tank, while the quantity of the activation mixture drawn from the post-sedimentation tank is bigger than the amount of the cleared water drained into the outlet.
8. The two-stage sewage water treatment plant using the biological activating system with suspended activated sludge, formed by the storage tank with sewage water inlet, air pump pumping raw water into the activation tank and emergency level indicator, as well as by the activation tank with aeration equipment and air pump designed to fill the post-sedimentation tank provided with the clear water outlet, characterised in that, the activation tank (2) is provided with sludge drainage air pump (12) designed to pump excessive sludge into the sludge box (19), provided with the aeration device (24), connected with the aeration device (10) of the activation tank (2) to form one branch of the aeration system, while the storage tank (1) is provided with aeration device (3) of the second branch of the aeration system, both branches being connected with the changeover switch
9. The two-stage sewage water. activation treatment plant according to claim 8, characterized in that, the changeover switch is formed by a time switch (26).
10. The two-stage sewage water activation treatment plant according to claim 8, characterized in that, the changeover switch is formed by a level indicator switch (34) situated in the storage tank (1).
11. The two-stage sewage water activation treatment plant according to claims 8 to 10, characterized in that, the aeration system is formed by the compressor (21) with two valves (22) and (23), while the electrovalve (23) is connected with the first air distributor (24) forming one of the aeration system branches and the electrovalve (22) is connected with the second air distributor (25) forming the second branch of the aeration system.
12. The two-stage sewage water activation treatment plant according to claims 8 to 10, characterized in that, the aeration system is formed by two compressors (27) and (28), while the first compressor (27) is connected with the first air distributor (24) and the second compressor (28) is connected with the second air distributor (25).
13. The two-stage sewage water activation treatment plant according to claims 8 to 10, characterized in that, the aeration system is formed by the compressor (21) connected with the three-way electrovalve (30) designed for intermittent switching on/off of air distributors (24) and (25).
14. The two-stage sewage water activation treatment plant according to claims 8, 9 and 11 to 13, characterized in that, the storage tank (1) is provided with the blocking level (29) indicator (9) designed to block the storage tank (1) aeration, as well as the emergency level indicator (8) for sound and light signalling.
15. The two-stage sewage water activation treatment plant according to claims 8 to 14, characterized in that, the post-sedimentation tank (19) is provided with the air pump (18) of floating impurities, activated only for the duration of the activation tank (2) and the sludge box (19) aeration.
16. The two-stage sewage water activation treatment plant according to claims 8 to 15, characterized in that, the aeration device (20) is formed by the air-lift pump the delivery pipe of which has stot a closed outlet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CZ19994226A CZ291934B6 (en) | 1999-11-26 | 1999-11-26 | Sewage water bio-aeration process and a plant for making the same |
| CZPV4226-99 | 1999-11-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2315407A1 true CA2315407A1 (en) | 2001-05-26 |
Family
ID=5467841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2315407 Abandoned CA2315407A1 (en) | 1999-11-26 | 2000-08-08 | Method and apparatus for sewage water treatment using the biological activating system |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2315407A1 (en) |
| CZ (1) | CZ291934B6 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2624074A (en) * | 2022-09-07 | 2024-05-08 | Topol Jan | Wastewater treatment method and equipment for implementing said method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ307806B6 (en) * | 2012-04-02 | 2019-05-22 | Jan Topol | A method for treating waste water with controlled de-nitrification and equipment for carrying out the process |
| CZ36051U1 (en) * | 2022-03-23 | 2022-05-26 | Jan Ing Topol | Domestic wastewater treatment plant with sludge dewatering |
-
1999
- 1999-11-26 CZ CZ19994226A patent/CZ291934B6/en not_active IP Right Cessation
-
2000
- 2000-08-08 CA CA 2315407 patent/CA2315407A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2624074A (en) * | 2022-09-07 | 2024-05-08 | Topol Jan | Wastewater treatment method and equipment for implementing said method |
Also Published As
| Publication number | Publication date |
|---|---|
| CZ9904226A3 (en) | 2002-06-12 |
| CZ291934B6 (en) | 2003-06-18 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |