CN101602541B - Biological sewage treatment technology and biological sewage treatment device - Google Patents
Biological sewage treatment technology and biological sewage treatment device Download PDFInfo
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- CN101602541B CN101602541B CN2008101149041A CN200810114904A CN101602541B CN 101602541 B CN101602541 B CN 101602541B CN 2008101149041 A CN2008101149041 A CN 2008101149041A CN 200810114904 A CN200810114904 A CN 200810114904A CN 101602541 B CN101602541 B CN 101602541B
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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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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a biological sewage treatment technology which comprises the following steps: injecting sewage into a biological reaction tank; mixing a circulatory water-sludge mixture in the biological reaction tank and the injected sewage and then filling the mixture into an aeration area, wherein the dissolved oxygen content of the aeration area is 0.1 mg/L to 0.5 mg/L; and separating the water-sludge mixture passing through the aeration area to obtain clear water. Compared with the prior art, the biological sewage treatment technology is beneficial to removing organic matter in the sewage and realizes the denitriding process of synchronous nitrification and denitrification because the dissolved oxygen content is controlled from 0.1 mg/L to 0.5 mg/L and a dissolved oxygen concentration value in an aeration tank is not beyond the range, thereby needing not to carry out the denitriding process of a denitrification tank, saving technical steps and equipment and being capable of achieving a discharge standard. The invention also discloses a biological sewage treatment device which can realize the biological sewage treatment technology.
Description
Technical field
The present invention relates to a kind of sewage treatment process and device, relate in particular to a kind of bio sewage treating process and device, belong to water treatment field.
Background technology
Along with the development of society, the problem of water scarcity is serious day by day, and water will become an important factor of restriction social development.People also more and more pay attention to the exploitation and the improvement of water technology.
Bio sewage treating process is more special a kind of in the sewage treatment process, is called activated sludge process again.Activated sludge process can be divided into aerobic method and anaerobic process etc.In the aerobe Sewage treatment systems, mikrobe utilizes the dissolved oxygen in the water, and the organic pollutant in the oxidative degradation water carries out the lock out operation of mikrobe and water then, reaches the purpose of purifying waste water.The dissolved oxygen English name is Dissolved Oxygen, and usually note is made DO, is meant the content that is dissolved in oxygen in the water, shows that with milligram numerical table of oxygen in every premium on currency unit is mg/L.Oxygen in water how much be a very important index in the bio sewage treating process.
Mikrobe obtains enough dissolved oxygens in the water in order to make, and people utilize gas blower pressurized air or inflate in water through the surface stirring.Air-blowing device and supporting pipeline, stationary installation of oxygen etc. are provided for mikrobe, are referred to as aerating system.Aerating system has disc type aerating system, tubular type aerating system, shows to expose to the sun system etc.
In sewage purification process,, also to remove the nitrogenous compound in the sewage in addition except removing the organism in the water.Total nitrogen is an important indicator weighing pollution level in the water body, and the total nitrogen English name is total nitrogen, and note is made TN usually, and total nitrogen comprises the summation of the nitrogen element in all nitrogenous compounds in the water body.For example nitrite nitrogen, nitrate nitrogen, inorganic salt nitrogen and nitrogen-containing organic compound etc.The removal of nitrogen element is accomplished through three phases in the water body, at first organonitrogen is changed into ammonia nitrogen, then ammonia nitrogen is oxidized to nitric nitrogen, is that nitrogen or nitrous oxide are discharged into the atmosphere with nitrate-nitrogen reduction at last.Wherein, the process that ammonia nitrogen is oxidized to nitric nitrogen is a nitration reaction; With nitrate-nitrogen reduction is that the process of nitrogen or nitrous oxide is anti-nitration reaction, just denitrification process.If nitration reaction and anti-nitration reaction occur in the same biological reaction tank, be synchronous nitration and denitrification.Synchronous nitration and denitrification can be divided into short distance synchronous nitration and denitrification and omnidistance synchronous nitration and denitrification.Biological reaction tank can be realized the short-cut nitrification and denitrification denitrogenation according to the process of ammonia nitrogen → nitrite → nitrogen; Be about to the ammonia nitrogen oxidation and be controlled at the nitrosification stage; Carry out denitrification then, this two elementary reaction can take place synchronously, and this phenomenon is called the short distance synchronous nitration and denitrification.Traditional phenomenon that can realize the complete nitrification denitrification denitrogenation according to the process of organonitrogen → ammonia nitrogen → nitrite nitrogen → nitre nitrogen → nitrite nitrogen → nitrogen; Be that the ammonia nitrogen oxidation is in the nitrated stage; Carry out denitrification then, and two stages take place synchronously, this phenomenon is called omnidistance synchronous nitration and denitrification.The advantage of synchronous nitration and denitrification is conspicuous, can simplify technology and save the space occupation of land.
In traditional bio sewage treating process, aeration tank dissolved oxygen generally is controlled at about 2mg/L, and thinks that dissolved oxygen is high more; Help organic removal in the waste water more; But when improving dissolved oxygen, need bigger aeration energy consumption, improved the running cost of bio sewage treating process; Dissolved oxygen is high more, can not realize synchronous nitration and denitrification more.
Summary of the invention
An object of the present invention is to provide a kind of bio sewage treating process, this bio sewage treating process can reduce aeration energy consumption, realizes synchronous nitration and denitrification.
Another object of the present invention provides a kind of biology sewage treatment equipment.
In order to realize above goal of the invention, the present invention provides following technical scheme:
A kind of bio sewage treating process comprises the steps:
Sewage is fed biological reaction tank, after the mud mixture in the said biological reaction tank and the sewage of feeding mix, get into the aeration zone, the dissolved oxygen in said aeration zone is 0.1～0.5mg/L, will separate through the mud mixture in aeration zone to obtain clear water.The dissolved oxygen in said aeration zone is preferably 0.15～0.4mg/L, more preferably 0.25～0.35mg/L.
In traditional bio sewage treating process; Aeration tank dissolved oxygen generally is controlled at about 2mg/L, and thinks that the concentration of dissolved oxygen is the bigger the better, and the inventor discovers through secular groping; If the dissolved oxygen concentration in aeration zone is 0.1～0.5mg/L; The dissolved oxygen concentration value is no more than this scope in the aeration tank, and is not only favourable to organic removal in the waste water, and realized the denitrification process of synchronous nitration and denitrification simultaneously; Therefore do not need to carry out again the denitrogenation processing in denitrification pond, practiced thrift process step and equipment.
In the above-mentioned bio sewage treating process, the difference of the COD value after the mud mixture in the said biological reaction tank and the sewage of feeding are mixed and the COD value of said clear water is more preferably less than 100mg/L, most preferably less than 50mg/L preferably less than 150mg/L.
The COD value is important index during biological sewage is handled, and English name is Chemical OxygenDemand, i.e. COD.The COD value is meant under certain condition, adopts the oxygen amount that water consumed of chemical oxidizing agent oxidation unit volume.It is what a index of reducing substances in the expression water.Reducing substances in the water has various organism, nitrite, sulfide, ferrous salt etc.But main is organism.Again often as weighing what index of organic content in the water.COD is big more, explains that water body receives organic pollution serious more.The common COD value of sewage that has just fed is all higher; Want high a lot of with respect to the water outlet of processing requirement or the COD value of title clear water; If with sewage that feeds and the mud mixture in the biological reaction tank, can a diluting effect be arranged to the sewage that feeds, if the difference of the value of the COD of the COD value of the mud mixture that dilution obtains and water outlet is less than 150mg/L; The pollutant load of so whole biological reaction tank inside is more even; Variable gradient is little, has so just avoided influent quality to change to cause to mikrobe to be the impact of active sludge suddenly, has strengthened the capacity of resisting impact load of technology; And can play synergy with above-mentioned dissolved oxygen concentration collocation use, handle more effective for synchronous nitration denitrification denitrogenation.The difference of value of COD of COD value and water outlet that is more preferably the mud mixture that obtains of dilution most preferably is less than 50mg/L less than 100mg/L.
This method can realize through the internal circulating load of the mud mixture in the adjusting biological reaction tank and the flooding quantity of sewage.For different sewage, the multiple of dilution is different.For example, can dilute 15～20 times and get final product for the processing of sewage; And for the processing of rubbish parting liquid, it is bigger that extension rate then needs, sometimes even can reach 1000 times extension rate.For example, the sewage flooding quantity that handle is 1m
3/ h, water inlet COD value is 1000mg/L, and water outlet requires the COD value less than 100mg/L.Through design calculation, the hydraulic detention time of biological reaction tank is can water pollutant be degraded to below the 100mg/L in 15 hours, that is to say, and COD value＜100mg/L in the terminal water outlet of biological reaction tank circulation, and the system design internal circulating load is 20m
3/ h that is to say that extension rate is 20 times, and after water inlet and circulation mud mixture mixed, the COD value was through calculating less than 150mg/L.
Preferably, the mud mixture in the biological reaction tank of mentioning in the mud mixture in the said biological reaction tank and the sewage of feeding is the mud mixture that has just obtained through separation.In each technical scheme of the present invention; Mud mixture in the biological reaction tank obtains two portions through separating; A part is a clear water, and another part is a mud mixture, and this part mud mixture continues circulation in biological reaction tank; The COD value is lower in the mud mixture that process separation just obtains; The minimum that part of mud mixture of COD in the mud mixture in the biological reaction tank if this part mud mixture removes to dilute the sewage of firm feeding, can reach in the biological reaction tank the comparatively average purpose of pollutant load everywhere so.
Preferably, before dividing plate is set in the aeration zone, the top of dividing plate is lower than the water surface, before dividing plate, utilizes the upwelling of air that mud mixture is pushed the aeration zone.This part can be referred to as air plug-flow system.
A kind of biology sewage treatment equipment; Sludge-water separating system is arranged in the inside of biological reaction tank, promote mud mixture round-robin system and aerating system; Aerating system comprises many aeration tubes and air-blast device; Spacing between the adjacent aeration tube is 8～30cm, and preferably, the spacing between the aeration tube is 10～20cm.
Utilize this biology sewage treatment equipment, can realize bio sewage treating process provided by the invention.
Sludge-water separating system is used to separate the mud mixture through the aeration zone.Promoting mud mixture round-robin system is the mobile power that provides of water cycle in the biological reaction tank.
Preferably, said aeration tube is an aeration flexible pipe.Aeration flexible pipe helps installing and changing more.
Preferably, said sludge-water separating system comprises two partition walls, and a plurality of swash plates or precipitation filling are set between the partition wall.
Preferably, two partition walls are arranged, between said two partition walls air feeder is arranged at an end of said aerating system.Preferably, the aerating system partition wall that closes in said two partition walls is vertical wall, and another one is the partition wall that tilts to aerating system.Preferably, said air feeder is near the bottom of biological reaction tank; More preferably, said air feeder is the ported sub that is connected with air-blast device.
Bio sewage treating process provided by the invention compared with prior art; Because dissolved oxygen content is controlled between 0.1～0.5mg/L, the dissolved oxygen concentration value is no more than this scope in the aeration tank, and is highly beneficial to organic removal in the waste water; And realized the denitrification process of synchronous nitration and denitrification simultaneously; Therefore do not need to carry out again the denitrogenation processing in denitrification pond, practiced thrift process step and equipment, and can reach emission standard.
Biology sewage treatment equipment provided by the invention compared with prior art can be realized bio sewage treating process provided by the invention, can in a biological reaction tank, accomplish the processing to sewage.
Description of drawings
Fig. 1 is a kind of concrete embodiment of process flow sheet of the present invention;
Fig. 2 is the floor plan synoptic diagram of a kind of concrete embodiment provided by the present invention;
Fig. 3 is that the A-A of Fig. 2 is to sectional view;
Fig. 4 is that the B-B of Fig. 2 is to sectional view.
The implication of each mark is among the figure:
1---inlet flume, 2---air plug-flow system, 3---the aeration zone, 4---effluent trough, 5---dissolved oxygen meter, 6---transmitter; 7---PLC VFC cabinet, 8---Root's blower, 9---sludge-water separating system, 10---partition wall, 11---partition wall; 12---air diffuser, 13---perforated baffle, 14---the air arm, 15---clip, 16---air distribution; 17---the stretching roller bearing, 18---equilibrator, 19---aeration flexible pipe, 20---the stretching roller bearing, 21---the air feed arm; 22---partition wall, 23---the clear water receiving tank, 24---partition wall, 25---precipitation filling, 26---the mud passage.
Embodiment
Technical scheme for a better understanding of the present invention, set forth below in conjunction with embodiment:
See also Fig. 1, Fig. 1 is a kind of concrete embodiment of process flow sheet of the present invention.Dotted portion is for carrying out in a biological reaction tank or title pond body among Fig. 1.Pending sewage; At first get into inlet flume and mix the back and get into air plug-flow system from the mud mixture that sludge-water separating system comes, air plug-flow system with the mud mixture plug-flow to the aeration zone; Mud mixture through the aeration zone gets into sludge-water separating system, obtains clear water through separating.Another part mud mixture continues to be mixed into next circulation with the new sewage that gets into.The dissolved oxygen of said aeration zone is controlled at 0.1～0.5mg/L by dissolved oxygen meter.In this embodiment, the air of air plug-flow system and aeration zone is all provided by the gas blower of same air blast machine room, and preferably it is set to program control type.Also can use difference independently gas blower or air blast machine room.
In the aeration zone, adopt aeration flexible pipe as air diffuser, be installed at the bottom of the aeration tank, spacing is 10～20cm between every, the intensive aeration flexible pipe that lays of trying one's best is realized the big area aeration mode.In aeration process, control the air flow of lower unit length aeration flexible pipe, the air flow of general aeration flexible pipe is not less than 3m
3Air/rice aeration flexible pipe, perhaps littler, the such aeration flexible pipe layout and the mode of air flow; Make that aeration is more even relatively in the aeration tank, body any corner in pond all can have air to charge into, and the aeration dead angle do not occur; Because air flow is little, and the bobble rise velocity that micro-pore aeration flexible pipe diffuses out is little, the residence time in water is long simultaneously; The efficient of oxygen transmission is improved greatly, can reach about 25%～35%, refer in sewage; Under the situation of 6 meters depth of waters, and other technologies oxygen transfer efficiency under equal conditions is not higher than 15%.
See also accompanying drawing 2～4, accompanying drawing 2 is floor plan synoptic diagram of a kind of concrete embodiment provided by the present invention, Fig. 3 be the A-A of Fig. 2 to sectional view, Fig. 4 is that the B-B of Fig. 2 is to sectional view.Deliver to the inlet flume 1 of biological reaction tank through pretreated waste water by pump or other modes,, get into the pond body-internal-circulation through behind the water distribution uniformity.Get into the waste water behind the internal recycle of pond, at first mixes, diluted back entering air plug-flow system 2 with mud passage 26 circulation fluids from sludge-water separating system 9 bottoms; Air plug-flow system leaves water entry in mid-board 10 bottoms, and circulation fluid gets into air plug-flow system from the bottom, and partition wall 11 tops are positioned under the liquid level; Circulation fluid portion from it flows out, and perforated baffle 13 is arranged at partition wall 11 bottoms, prevents that liquid from refluxing from here; Pocket is arranged on the baffle plate, supply aeration flexible pipe to pass.Air diffuser 12 is set between two partition walls, blasts air by air feed arm 21, when air blasts, can cause in the partition wall zone and outside liquid level difference, then promote liquid-flow, the amount of liquid-flow and speed all can be regulated through air demand.In water treatment procedure, be full of sewage in the various piece of biological reaction tank, comprise between body of wall 11 and the body of wall 10 also being full of sewage; In water treatment procedure, the liquid level of sewage will be higher than the top of body of wall 11 and be lower than the top of body of wall 10, from the next air draught of air supply device; After forming a large amount of bubbles and emerging, air and sewage is thorough mixing between body of wall 10 and body of wall 11, and air water mixed solution density is lower than the density of the water on body of wall 11 right sides; Under the hydraulic pressure effect; The air water mixed solution continually, forms plug-flow circulation in the pond in body of wall 11 tops get into the aeration zone.The hybrid mode of air and sewage like this can be so that mixing of sewage provides the outside growing environment of homogeneous for active sludge.The liquid level difference of body of wall 11 both sides preferably is controlled at below the 20cm, below the preferred 10cm.
Circulation fluid gets into aeration zone 3, and the bottom, aeration zone is thick with aeration flexible pipe 19, and the spacing between the adjacent aeration flexible pipe is 10～20cm; Air gets into air arm 14 from gas blower 8; And, having micropore on the aeration flexible pipe 19 by air distribution 16 entering aeration flexible pipes, air is diffused in the water through micropore; Produce a large amount of bubbles, microbiological deterioration pollutent use in the feedwater is provided oxygen.Circulation fluid is in process of flowing, and aeration zone leading portion pollutant load is high, and oxygen requirement is big, but aeration is uniform relatively, so show COD concentration high (representing pollutent with COD concentration) at leading portion, DO concentration is little.Along with flowing of mixed solution, COD concentration is more and more lower, and the DO that thereupon changes is increasingly high; When arriving the aeration zone end, technology is provided with dissolved oxygen meter 5, if dissolved oxygen meter 5 detects when in the water dissolved oxygen being arranged; Just explain that the mikrobe in the water has no longer needed so many air capacity, for fear of the waste and the deficiency of oxygen amount (air capacity), through setting the bound of dissolved oxygen meter 5; And combine transmitter 6 and PLC VFC cabinet 7 control Root's blowers 8, according to dissolved oxygen meter 5 detection datas, adjust the frequency of gas blower; Increase or reduce what of wind supply quantity, the oxyty span of control is 0.25～0.35mg/L.
Aeration flexible pipe flattens and guarantees the level of aeration flexible pipe by equilibrator 18, and the inlet end of aeration flexible pipe 19 has clip 15 to be connected with air distribution 16, and the other end is fastened on pre-buried hook by the nylon withdrawal line pull-up.Respectively there is row's stretching roller bearing 17 at two ends at the bottom of the pond, play the leading sheave effect when changing aeration flexible pipe.
Effluent cycle after treatment gets into sludge-water separating system 9, carries out mud-water separation here, and swash plate or other precipitation fillings 25 are set between partition wall 24 and partition wall 22; Mud mixture slowly gets into filler from the bottom of filler 25; Because the filler water flow inside is mild relatively, stable, muddy water separates on the surface of filler; Sludge settling is on the surface of filler and owing to gravity landing again goes out filler; And the clear water zone that the clear water after separating rises is collected by clear water receiving tank 23, and finally flows in the effluent trough 4.
Mud after the separation sinks in the filler bottom mud passage 26, after following circulation fluid and water inlet mixing, gets into circulation again.
For the air plug-flow system 2 in the above-mentioned concrete embodiment; Main effect is to promote mud mixture circulation in the body of pond, makes aeration zone internal contamination substrate concentration relative equilibrium, be exactly the Pollutant levels difference of aeration zone front end and rear end try one's best little; The COD concentration in any zone will differ very little in the aeration zone like this; Oxygen requirement relative equilibrium in any zone, whole aeration zone in the process of aeration, can not occur local because COD concentration is just distinguished bigger; And cause the severe local oxygen supply not enough or superfluous, cause body interior dissolved oxygen conditions in pond to change greatly.Pond internal contamination substrate concentration relative equilibrium is one of key condition of dissolved oxygen stable control.Application of air plug-flow of the present invention system promotes that mixed solution circulates in the aeration tank in the body of pond, realized that body inside, whole pond does not have higher concentration gradient poor; Simultaneously; According to the variation of influent concentration, the air capacity of air plug-flow system is also finely tuned with the interlock of aeration zone air capacity, and the adjustment recycle ratio doubly; It is even relatively that purpose is exactly the intravital pollutant load in pond, the oxygen requirement relative equilibrium of aeration zone various piece.
System of laying and aeration mode for the aeration flexible pipe in the above-mentioned concrete embodiment; The intensive decoration form that lays of aeration flexible pipe and the control of low air flow make that aeration is more even relatively in the aeration tank; Body any corner in pond all can have air to charge into; The aeration dead angle do not occur, can not cause local aeration rate big or little yet, guarantee that the homogeneity of air diffuser also is evenly to control the key of dissolved oxygen.The intensive diameter that can reduce the aeration bubble that lays of aeration tube; Increase the specific surface area of aeration bubble; The contact surface of aeration bubble and sewage also increases accordingly, can improve the dissolved efficiency of oxygen, increases the utilization ratio of air; Thereby the saving energy consumption, the dissolution evenness and the efficient of raising dissolved oxygen.
In above-mentioned embodiment, on the basis of aeration and air plug-flow technology, guarantee that body inner Pollutant levels gradient difference in pond is less; The aeration zone aeration is even, but will control the intravital dissolved oxygen in pond still is not easy about 0.1～0.3mg/L (illustrating), and reason is the variation of influent waste water water quality; As after the COD concentration of intaking increased, the intravital overall load in pond will raise, and oxygen requirement also can raise; This just needs to improve wind supply quantity, otherwise, reduce wind supply quantity.Can find out that from Fig. 2～4 end has been installed a dissolved oxygen meter in the aeration zone, dissolved oxygen meter (is generally selected Root's blower through PLC and gas blower; And be furnished with frequency transformer) couple together, dissolved oxygen meter is surveyed the concentration of oxygen in water, through transmitter concentration signal is converted into electrical signal and discerns by PLC; Control dissolved oxygen concentration scope is 0.1～0.3mg/L in the PLC program, that is to say that concentration is higher than 0.3mg/L if dissolved oxygen meter measures oxygen in water; The electrical signal that PLC obtains will be higher than its capping, and through after the computing, PLC is transferred to frequency transformer with signal; Turn down the frequency of gas blower through frequency transformer, reduce wind supply quantity; Otherwise, improve wind supply quantity.Simultaneously; The front is mentioned; The air capacity of air plug-flow system is that the air capacity with the aeration zone is that interlock changes, and the internal circulating load of air plug-flow system has also been regulated in the adjusting of dissolved oxygen meter-frequency-changing control system of fan simultaneously, more helps balanced pollutant load; Help the control of dissolved oxygen, function supplements and complements each other.In the actual process operational process, be decided to be 0.3～0.5Hz to the frequency number of each blower fan frequency rising or reduction, so both can have reached the purpose of adjustment, also can not cause excessive adjustment, cause overshoot.
After having had automatic control to regulate, the dissolved oxygen control of technology in operational process just can change hook with actual influent quality, adjusts the frequency of gas blower at any time, satisfies the demand of the intravital air quantity in pond, also can not cause waste.
Utilize above-mentioned system to carry out actual water treatment test, specific embodiment is:
Embodiment 1
Certain chemical fibre factory's waste water is raw material with toluene, produces caprolactam monomer; COD in the waste water, ammonia nitrogen concentration are higher, and original technology is SBR technology, uses biologic treating technique provided by the invention and transforms; Dissolved oxygen concentration is controlled at 0.25～0.35mg/L, is spaced apart 15cm between the adjacent aeration flexible pipe, transforms the back technical process and is: oil trap+equalizing tank+biological reaction tank+water outlet; System's operational excellence, running cost has reduced half the than original technology, and each item effluent index is as shown in table 1:
The desired value of certain chemical fibre factory's waste water of table 1 before and after biologic treating technique is handled
| Biological reaction tank | COD(mg/L) | NH 3-N(mg/L) | TN(mg/L) |
| Water inlet | 6000～8000 | 300～500 | 2000 |
| Water outlet before transforming | 200～300 | 50 | 400～800 |
| Transform the back water outlet | 70-150 | ＜10 | ＜100 |
NH
3-N represents the ammonia nitrogen in the water, and ammonia nitrogen refers to the chemical combination ammonia that exists with ammonia or ammonium ion form.Ammonia nitrogen is the nutrient substance in the water body, can cause the water eutrophication phenomenon to produce, and is the main oxygen consumption pollutent in the water body, and is toxic to fish and some hydrobiont.
Embodiment 2
Certain acrylonitrile plant waste water, principal pollutant are in factory's eliminating waste water: prussiate, formaldehyde, octanol, phenol, organic acid, petroleum-type and sulfide or the like, directly cause COD in the waste water
Cr, ammonia nitrogen concentration is higher, toxic, original technology is SBR technology, subject matter is that the water outlet ammonia nitrogen exceeds 3 to 4 times of influent ammonia nitrogens, reason is that waste water contains more itrogenous organic substance, is converted into ammonia nitrogen in aeration process.The biologic treating technique of using in the practical implementation method of the present invention is transformed; Transforming the back technical process is: oil trap+equalizing tank+biological reaction tank+water outlet, and dissolved oxygen concentration is controlled at 0.25～0.35mg/L, is spaced apart 15cm between the adjacent aeration flexible pipe; System's operational excellence; Running cost has reduced about 30% than original technology, and water outlet is thoroughly up to standard, and each item effluent index is as shown in table 2:
The desired value of certain acrylonitrile plant waste water of table 2 before and after biologic treating technique is handled
| Biological reaction tank | COD(mg/L) | NH 3-N(mg/L) | TN(mg/L) |
| Water inlet | 800～1200 | 30～60 | 120～180 |
| Water outlet before transforming | 300～500 | 80～120 | 120～150 |
| Transform the back water outlet | 40-120 | ＜20 | ＜35 |
Embodiment 3
Certain municipal wastewater treatment plant; Using biologic treating technique provided by the invention designs; Technical process is: coarse rack+water inlet pump house+thin barrier+sedimentation basin+biological reaction tank provided by the invention+sterilization+water outlet, and dissolved oxygen concentration is controlled at 0.25～0.35mg/L, is spaced apart 15cm between the adjacent aeration flexible pipe; System's operational excellence, each item effluent index is as shown in table 3:
The desired value of certain municipal wastewater of table 3 before and after biologic treating technique is handled
| Biological reaction tank | COD(mg/L) | NH 3-N(mg/L) | TN(mg/L) | TP(mg/L) |
| Water inlet | 300～600 | 40 | 50 | 10～15 |
| Water outlet | ＜50 | ＜5 | ＜10 | ＜1 |
Can find out from above-mentioned wastewater treatment efficiency; Bio sewage treating process provided by the invention and device, operation energy consumption is more saved, and can realize synchronous nitration and denitrification; Need not build the denitrification pond in addition; Reduce and take up an area of, low dissolved oxygen obtains better COD water outlet effect down, and the whole effluent index of technology is better.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (5)
1. a bio sewage treating process comprises the steps:
Sewage is fed biological reaction tank; After the mud mixture in the said biological reaction tank and the sewage of feeding mix, get into the aeration zone, the mud mixture in the said biological reaction tank is just through separating the mud mixture that obtains; Processing for sewage; Extension rate is 15～20 times, and for the processing of rubbish parting liquid, extension rate is 1000 times;
The dissolved oxygen in said aeration zone is 0.25～0.35mg/L, will separate through the mud mixture in aeration zone to obtain clear water, and there is sludge-water separating system the inside of said biological reaction tank, promotes mud mixture round-robin system and aerating system.
2. bio sewage treating process according to claim 1 is characterized in that, the difference of the COD value after the mud mixture in the said biological reaction tank and the sewage of feeding are mixed and the COD value of said clear water is less than 150mg/L.
3. bio sewage treating process according to claim 2 is characterized in that, the difference of the COD value after the mud mixture in the said biological reaction tank and the sewage of feeding are mixed and the COD value of said clear water is less than 100mg/L.
4. bio sewage treating process according to claim 3 is characterized in that, the difference of the COD value after the mud mixture in the said biological reaction tank and the sewage of feeding are mixed and the COD value of said clear water is less than 50mg/L.
5. bio sewage treating process according to claim 1 is characterized in that, before dividing plate is set in the aeration zone, and the top of dividing plate is lower than the water surface, before dividing plate, utilizes the upwelling of air that mud mixture is pushed the aeration zone.
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| CN102795745A (en) * | 2012-08-18 | 2012-11-28 | 江苏凌志市政工程设计研究院有限公司 | Integrated multi-cycle biological multiplication sewage treatment system |
| CN104045154B (en) * | 2013-03-12 | 2016-07-20 | 江苏瑞盛水处理有限公司 | Sewage biological treatment system based on Biological Contact Oxidation Process |
| CN103395944B (en) * | 2013-08-15 | 2015-09-30 | 浙江大学苏州工业技术研究院 | A kind of full pneumatic type Domestic sewage integrated treatment unit and method |
| CN104003517B (en) * | 2014-06-20 | 2016-04-27 | 必德普(北京)环保科技有限公司 | A kind of biological multiplication sewage water denitrification treatment system and sewage water denitrification handling method |
| WO2015192367A1 (en) * | 2014-06-20 | 2015-12-23 | 必德普(北京)环保科技有限公司 | Bio-dopp sewage denitrification system and sewage denitrification method |
| CN106145201A (en) * | 2015-03-27 | 2016-11-23 | 南通海陵环境检测有限公司 | A kind of sewage detection processing means |
| CN107140786A (en) * | 2017-05-25 | 2017-09-08 | 清水源（上海）环保科技有限公司 | A kind of biology sewage treatment equipment |
| CN107244754B (en) * | 2017-07-15 | 2023-04-21 | 北京得世达环保科技有限公司 | Adjustable air plug flow equipment and installation mode |
| UA120201C2 (en) * | 2017-10-05 | 2019-10-25 | Александр Тетеря | WASTEWATER TREATMENT METHOD (OPTIONS) AND INSTALLATION FOR ITS IMPLEMENTATION |
| IL261837A (en) * | 2018-09-17 | 2019-01-31 | S G T Sustainable Green Tech Ltd | Process and apparatus for the treatment of organic feedstock |
| IL261842A (en) | 2018-09-17 | 2019-01-31 | S G T Sustainable Green Tech Ltd | Efficient operation of an anaerobic-aerobic sbr |
| CN109305725B (en) * | 2018-11-23 | 2021-06-01 | 恩格拜（武汉）生态科技有限公司 | Biochemical sewage treatment process |
| CN110211473B (en) * | 2019-05-16 | 2021-04-09 | 河海大学 | Water tank model capable of simulating different wind field effects |
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