CN111268887A - Step-by-step filter pressing method for sludge dewatering - Google Patents
Step-by-step filter pressing method for sludge dewatering Download PDFInfo
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- CN111268887A CN111268887A CN202010172340.8A CN202010172340A CN111268887A CN 111268887 A CN111268887 A CN 111268887A CN 202010172340 A CN202010172340 A CN 202010172340A CN 111268887 A CN111268887 A CN 111268887A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a step-by-step pressure filtration method for sludge dewatering, which comprises the following steps: A. conveying the sludge into a plate-and-frame filter press by using a diaphragm pump for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than a set high pressure; B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, the sludge is pumped into the plate-and-frame filter press by a screw; C. when the pressure in the plate-and-frame filter press is higher than the set high pressure, the screw pump stops working; D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, conveying the sludge into the plate-and-frame filter press by using a screw pump; E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge. The invention utilizes the characteristic of large flow of the diaphragm pump to carry out the first-stage conveying, thereby reducing the conveying time of the first stage and improving the efficiency; in the second stage, the screw pump is used for conveying, and the water in the sludge mixed liquor is easier to be extruded due to higher pressure, so that the dehydration rate is improved.
Description
Technical Field
The invention relates to the technical field of sludge dewatering, in particular to a step-by-step filter pressing method for sludge dewatering.
Background
The global social economy is rapidly developed, the living standard of people is gradually improved, and the environmental problems are gradually increased. Wherein, the problems of sewage and sludge are more serious, the sewage discharge and treatment amount is gradually increased, and the corresponding sludge generation amount is also increased. Therefore, how to effectively treat the municipal sludge and realize the harmlessness, reclamation and high value of the sludge becomes an urgent problem which must be solved in China. In order to effectively treat the sludge, the country sets strict requirements on the water content of various sludge treatment modes, for example, the water content of the sludge is required to be lower than 60% when land is buried, the water content of dewatered sludge of a municipal sewage treatment plant is required to be lower than 80%, and the water content of the sludge for aerobic composting is required to be lower than 65%. The water content of untreated sludge in a sewage treatment plant is up to more than 99%, the water content of the concentrated sludge can be reduced to 94-97%, the water content of the sludge subjected to conventional medicament conditioning and mechanical dehydration treatment can be reduced to 70-80%, and obviously, the water content of the sludge does not meet the requirements of recycling and disposal. It can be seen that the high water content of the sludge is a key factor limiting the sludge disposal.
In the prior art, in order to reduce the water content of sludge, the processes of adding chemicals, conditioning, dehydrating, squeezing and the like are generally adopted for the sludge. For example, patent document CN 110590121a discloses a sludge dewatering method in which a specific sludge dewatering agent is used to dewater sludge so that the specific resistance of the sludge is within a range suitable for mechanical dewatering, thereby reducing the water content of the sludge to 20% or less.
When the sludge is subjected to mechanical filter pressing, the sludge is generally conveyed to a filter press by a single screw pump or a diaphragm pump to be subjected to single-step filter pressing, and for example, in patent document CN110590122A, the sludge slurry is conveyed into the filter press by a high-low pressure variable frequency screw pump to obtain a sludge cake with the water content of 50-55% and wastewater.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a step-by-step pressure filtration method for sludge dewatering, which solves the problems that a screw pump is easy to wear a conveying overflowing part for a long time, the equipment maintenance time is long, and the maintenance cost is high, solves the problems that the pressure of a diaphragm pump is relatively low and the sludge dewatering rate is relatively low, and achieves the effects of obviously improving the equipment utilization rate and the sludge dewatering rate.
The purpose of the invention is realized by the following technical scheme:
the invention provides a step-by-step pressure filtration method for sludge dewatering, which comprises the following steps:
A. conveying the sludge into a plate-and-frame filter press by using a diaphragm pump for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than a set high pressure;
B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, the sludge is pumped into the plate-and-frame filter press by a screw;
C. when the pressure in the plate-and-frame filter press is higher than the set high pressure, the screw pump stops working;
D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, conveying the sludge into the plate-and-frame filter press by using a screw pump;
E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge.
Preferably, in steps A and C, the high pressure is 0.55-0.6 MPa.
Preferably, in steps B and D, the low pressure is 0.3 MPa.
Preferably, the pressure is measured using an electro-contact pressure gauge.
Preferably, the flow rate of the diaphragm pump is 10-15m3H, more preferably a flow rate of 12m3/h。
Preferably, the screw pump has a head of 55-65m, more preferably a head of 60 m.
If the flow rate of the diaphragm pump and the lift of the screw pump are not within the above ranges, the effect is reduced.
Preferably, the diaphragm pump and the screw pump are connected in parallel.
Preferably, the sludge is concentrated sludge with water content of 60-80%.
Compared with the prior art, the invention has the following beneficial effects:
(1) the first stage of conveying is carried out by utilizing the characteristic of large flow of the diaphragm pump, so that the first stage of conveying time is shortened, and the efficiency is improved; and secondly, the abrasion of the long-time conveying overflowing part of the screw pump is reduced, so that the maintenance cost of the equipment is reduced, and the utilization rate of the equipment is improved.
(2) By utilizing the characteristic of higher pressure of the screw pump, the water in the sludge mixed liquid is easier to be extruded out, and the dehydration rate is improved. The dehydration rate of the invention can reach 55 percent.
(3) By using two pumps, one pump can be ensured to be continuously used under the condition of failure, the working continuity of the equipment is ensured, and the equipment shutdown is reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a step-by-step pressure filtration apparatus for sludge dewatering of the present invention;
wherein, 1-plate and frame filter press; 2-a screw pump; 3-a diaphragm pump; 4-electric contact pressure gauge.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the following examples, diaphragm pumps with a flow rate of 10-15m were used3When any value in/h or the head of the screw pump is 55-65m, the effect equivalent to the following embodiment can be achieved.
Example 1
A step-by-step pressure filtration method for sludge dewatering adopts equipment shown in figure 1 and comprises a plate-and-frame filter press 1, a screw pump 2 and a diaphragm pump 3, wherein the screw pump 2 and the diaphragm pump 3 are connected in parallel and then connected with an inlet of the plate-and-frame filter press 1, and the plate-and-frame filter press 1 is also connected with an electric contact pressure gauge 4 for detecting pressure. The step pressure method specifically comprises the following steps:
A. the concentrated sludge (water content 70%) was subjected to a diaphragm pump (flow rate 12 m)3H) conveying the mixture to a plate-and-frame filter press for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.55 MPa;
B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump (with the lift of 60 m);
C. when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.55MPa, the screw pump stops working;
D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump;
E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge.
The water content of the prepared dewatered sludge is only 28%, and the dewatering rate can reach 42%.
Example 2
A step-by-step pressure filtration method for sludge dewatering adopts equipment shown in figure 1 and comprises a plate-and-frame filter press 1, a screw pump 2 and a diaphragm pump 3, wherein the screw pump 2 and the diaphragm pump 3 are connected in parallel and then connected with an inlet of the plate-and-frame filter press 1, and the plate-and-frame filter press 1 is also connected with an electric contact pressure gauge 4 for detecting pressure. The step pressure method specifically comprises the following steps:
A. the concentrated sludge (water content 80%) was subjected to a diaphragm pump (flow rate 12 m)3H) conveying the mixture to a plate-and-frame filter press for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.6 MPa;
B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump (with the lift of 60 m);
C. when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.6MPa, the screw pump stops working;
D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump;
E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge.
The water content of the prepared dewatered sludge is only 25%, and the dewatering rate can reach 55%.
Example 3
A step-by-step pressure filtration method for sludge dewatering adopts equipment shown in figure 1 and comprises a plate-and-frame filter press 1, a screw pump 2 and a diaphragm pump 3, wherein the screw pump 2 and the diaphragm pump 3 are connected in parallel and then connected with an inlet of the plate-and-frame filter press 1, and the plate-and-frame filter press 1 is also connected with an electric contact pressure gauge 4 for detecting pressure. The step pressure method specifically comprises the following steps:
A. the concentrated sludge (water content 60%) was subjected to a diaphragm pump (flow rate 12 m)3H) conveying the mixture to a plate-and-frame filter press for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.6 MPa;
B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump (with the lift of 60 m);
C. when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.6MPa, the screw pump stops working;
D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure of 0.3MPa, conveying the sludge into the plate-and-frame filter press by using a screw pump;
E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge.
The water content of the prepared dewatered sludge is only 18 percent, and the dewatering rate can reach 42 percent.
Comparative example 1
A stepwise pressure filtration method for sludge dewatering comprises the following steps:
A. conveying the concentrated sludge (with water content of 70%) to a plate-and-frame filter press by a screw pump (with the lift of 60m) for filter pressing, wherein when the pressure in the plate-and-frame filter press is higher than the set high pressure of 0.55 MPa; the screw pump stops working;
steps B to E were the same as those in example 1.
The dehydrated sludge thus obtained had a water content of 31% and a dehydration rate of 39%. However, the overall press filtration time of this comparative example is significantly longer than that of example 1.
Comparative example 2
A stepwise pressure filtration process for dewatering sludge, substantially the same as that of example 1, except that: in steps A and C of this comparative example, the high pressure was set at 0.4 MPa.
The dehydrated sludge thus obtained had a water content of 38% and a dehydration rate of 32%.
Comparative example 3
A stepwise pressure filtration process for dewatering sludge, substantially the same as that of example 1, except that: in steps B and D of this comparative example, the low pressure was set at 0.4 MPa.
The dehydrated sludge thus obtained had a water content of 30% and a dehydration rate of 40%.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. A step-by-step pressure filtration method for sludge dewatering is characterized by comprising the following steps:
A. conveying the sludge into a plate-and-frame filter press by using a diaphragm pump for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than a set high pressure;
B. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, the sludge is pumped into the plate-and-frame filter press by a screw;
C. when the pressure in the plate-and-frame filter press is higher than the set high pressure, the screw pump stops working;
D. when the pressure in the plate-and-frame filter press is reduced to a set low pressure, conveying the sludge into the plate-and-frame filter press by using a screw pump;
E. and D, repeating the steps C and D until the pressure is not reduced any more, and obtaining the dewatered sludge.
2. A staged pressure filtration process for sludge dewatering according to claim 1, wherein in steps a and C said high pressure is between 0.55MPa and 0.6 MPa.
3. A staged pressure filtration process for sludge dewatering according to claim 1, wherein in steps B and D the low pressure is 0.3 MPa.
4. A staged pressure filtration method for sludge dewatering according to claim 1, characterized in that the flow rate of the membrane pump is 10-15m3/h。
5. The staged pressure filtration method for sludge dewatering according to claim 1, wherein the screw pump has a head of 55-65 m.
6. A staged pressure filtration method for dewatering sludge according to claim 1, wherein the diaphragm pump and screw pump are connected in parallel.
7. The stepwise pressure filtration method for sludge dewatering according to claim 1, wherein the sludge is a thickened sludge having a water content of 60-80%.
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| CN202010172340.8A CN111268887A (en) | 2020-03-12 | 2020-03-12 | Step-by-step filter pressing method for sludge dewatering |
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| CN202010172340.8A CN111268887A (en) | 2020-03-12 | 2020-03-12 | Step-by-step filter pressing method for sludge dewatering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504604A (en) * | 2022-10-17 | 2022-12-23 | 江西心连心化学工业有限公司 | High-efficiency energy-saving and environment-friendly high-pressure roller filter pressing system |
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Cited By (2)
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| CN115504604A (en) * | 2022-10-17 | 2022-12-23 | 江西心连心化学工业有限公司 | High-efficiency energy-saving and environment-friendly high-pressure roller filter pressing system |
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