CN106698876B - Ultrasonic filler combined sludge reduction process - Google Patents
Ultrasonic filler combined sludge reduction process Download PDFInfo
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- CN106698876B CN106698876B CN201611176156.0A CN201611176156A CN106698876B CN 106698876 B CN106698876 B CN 106698876B CN 201611176156 A CN201611176156 A CN 201611176156A CN 106698876 B CN106698876 B CN 106698876B
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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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
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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
Abstract
The invention relates to an ultrasonic filler combined sludge reduction device and a process, wherein the sludge reduction device comprises: the main stream biological treatment component comprises an anoxic tank, an aeration tank and a sedimentation tank which are sequentially connected along the flowing direction of sludge, and the bottom of the sedimentation tank is also connected back to the anoxic tank through a pipeline; and a sidestream sludge reduction component: the anaerobic treatment device comprises an ultrasonic unit and a biological decrement unit which are sequentially connected along the flowing direction of sludge, wherein an inlet of the ultrasonic unit is connected with a pipeline at the bottom of the sedimentation tank, and an outlet of the biological decrement unit is returned and connected with the anaerobic tank. Compared with the prior art, the ultrasonic pretreatment of the invention can change the form and the composition of sludge extracellular polymers, reduce the particle size of sludge flocs and help to accelerate the hydrolysis and lysis process of sludge, and by adding suspended fillers into a sidestream sludge reduction component, a habitat can be provided for microorganisms with a reduction function, the hydraulic retention time of the microorganisms is prolonged, and thus the sludge reduction efficiency is improved.
Description
Technical Field
The invention relates to the field of sludge reduction and discharge, in particular to an ultrasonic filler combined sludge reduction device and process.
Background
With the continuous development of social economy and the acceleration of urbanization process, the discharge amount and the treatment amount of urban sewage and industrial wastewater are increased day by day, and the sludge production amount of a corresponding sewage treatment plant is also increased sharply. At present, the annual dry sludge yield of China is about 934 ten thousand tons, and the annual dry sludge yield also increases year by year at a speed of 10%.
The residual sludge has high water content and large volume, and the method of concentration, dehydration and volume reduction, incineration, sanitary landfill, composting, land utilization and the like is generally adopted for final disposal. However, the excess sludge contains a large amount of harmful chemicals, parasites, heavy metals and the like, and the ecological environment and the health of people are threatened by improper treatment. Therefore, both sanitary landfill and incineration have problems of difficult site selection, secondary pollution and the like. In addition, the sludge treatment cost usually accounts for 25-50% of the total operation cost of the sewage treatment plant, and becomes a heavy financial burden for sewage operation units.
The realization of sludge in-situ reduction in the sewage treatment process is one of the important ways for solving the problem of excess sludge. The sludge in-situ reduction technology mainly comprises two main types of physical chemistry and biological process reduction technology. The physical-chemical in-situ reduction technology is realized by adding chemical agents (oxidants, uncouplers and the like) into the sludge or adopting physical reinforcement (such as ultrasound, high-temperature pyrohydrolysis and microwave). Although the physicochemical reduction method has the advantages of good effect and high speed, the problems of toxic by-products generation, microbial activity inhibition and the like need to be solved by adding chemical agents, and the physicochemical technology also faces the problems of higher energy consumption and higher cost. The biological in-situ decrement technology comprises an aerobic-sedimentation-anaerobic (OSA) process, a microfauna predation, a hydrolytic acidification pretreatment process, an enzyme preparation or functional microorganisms and the like. The biological in-situ decrement technology has the advantages of low operation cost and convenient operation management, but the decrement effect of the existing aerobic-sedimentation-anaerobic (OSA) process and the like is not obvious.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ultrasonic filler combined sludge reduction device and process.
The purpose of the invention can be realized by the following technical scheme:
an ultrasonic filler combined sludge reduction device comprises:
mainstream biological treatment subassembly: the device comprises an anoxic tank, an aeration tank and a sedimentation tank which are sequentially connected along the flowing direction of sludge, wherein the bottom of the sedimentation tank is also connected back to the anoxic tank through a pipeline; the bottom of the aeration tank is connected back to the anoxic tank through a pipeline.
And a sidestream sludge reduction component: the anaerobic treatment device comprises an ultrasonic unit and a biological decrement unit which are sequentially connected along the flowing direction of sludge, wherein an inlet of the ultrasonic unit is connected with a pipeline at the bottom of the sedimentation tank, and an outlet of the biological decrement unit is returned and connected with the anaerobic tank.
Preferably, the biological reduction unit includes a biological reduction tank and a floating filler filled in the biological reduction tank, and a rotating unit for making the floating filler in a floating state is further provided at the bottom of the biological reduction tank.
More preferably, the suspension filler is SPR-1 filler or Germany sponge filler, and the filling rate is 5-60%
More preferably, the biological reduction tank is an anaerobic tank;
when the rotary unit works, the rotating speed of the rotary unit is 100-500 rpm.
The ultrasonic filler combined sludge reduction process comprises the following steps:
(1) feeding sewage to be treated into an anoxic tank and an aeration tank in sequence for treatment, after solid-liquid separation of sludge-water mixed liquor in the aeration tank in a sedimentation tank, returning one part of sludge precipitated at the bottom to the anoxic tank, and pumping the other part of sludge into an ultrasonic unit;
(2) after the ultrasonic unit pretreats the sludge, the sludge is continuously sent into a biological reduction unit for treatment, and finally flows back to the anoxic tank.
Preferably, the sludge discharged from the bottom of the sedimentation tank in the step (1) is fed to the ultrasonic unit in a proportion of 5 to 100%.
Preferably, in the step (2), the hydraulic retention time in the ultrasonic unit is 0.5-30 min, and the sound energy density during ultrasonic treatment is 0.1-2W/ml.
Preferably, the operation mode of the ultrasonic unit in the step (2) is as follows: ultrasound 5s, stop 5 s.
Preferably, the hydraulic retention time of the biological reduction unit in the step (2) is 1 to 15 days.
The invention relates to an in-situ reduction treatment of filler microorganism enrichment activated sludge by coupling ultrasonic pretreatment, wherein sludge reduction type anaerobic hydrolysis microorganisms are domesticated and cultured by suspended fillers in a biological reduction tank to carry out process starting and operation of sludge reduction treatment. The invention can improve the anaerobic side-stream reduction speed of the sludge in-situ reduction process, shorten the reaction time and improve the sludge reduction efficiency.
The invention provides a reduction device: 1) the front end and the rear end of the ultrasonic unit are respectively provided with an interface. The sludge in the aeration tank of the main stream biological treatment component flows into the ultrasonic unit from the front end interface, and the particle size of sludge particles is reduced to the degree suitable for microbial hydrolysis by utilizing the strong shearing force generated by the ultrasonic device in a short time, so that the specific surface area of the particles is increased. In addition, the ultrasonic treatment can crack partial sludge particles, release intracellular substances and provide more high-quality carbon sources for the proliferation of the reduced microorganisms. The sludge after the ultrasonic pretreatment flows into the biological decrement unit through the rear-end interface. 2) The front end and the rear end of the biological decrement unit are respectively provided with an interface. The sludge after ultrasonic pretreatment flows into a biological decrement unit through a front-end interface. Suspended fillers are filled in the biological decrement unit, and decrement microorganisms with longer generation growth cycle can be enriched on the surface of the fillers, so that the biomass of the system is improved, and the biological phase of the unit is enriched. After the ultrasonic pretreatment sludge is subjected to biological decrement by the unit, the ultrasonic pretreatment sludge is conveyed to the front end of the mainstream biological treatment system through the back end interface by the reflux pump. Therefore, the sidestream sludge reduction unit and the mainstream biological treatment system form a lysis-recessive growth reduction configuration.
Compared with the prior art, the invention has the following advantages:
(1) the ultrasonic wave generates strong shearing force in a short time, so that the particle size of sludge particles is reduced, the specific surface area of the particles is increased, and the ultrasonic wave is suitable for absorption and utilization of subsequent unit decrement microorganisms; more carbon source may also be lysed to provide for the proliferation of the microorganism in the reduced amount. Thereby accelerating the hydrolysis rate and reducing the volume of the SSR reactor.
(2) Because the sludge in the lateral flow pool can be fixed on the filler in a biofilm mode, the retention time of microorganisms in the lateral flow pool is prolonged, so that the microorganisms with longer growth period can also breed, the number of protozoa and metazoa is increased, and an anaerobic bacteria layer is formed by the enrichment on the filler. By combining heterotrophic bacteria introduced by the anoxic and aerobic unit, the synergistic decrement can be realized. Meanwhile, the stuffing enriches the biological phases, and the biological predation effect and the endogenous metabolism effect of microorganisms are fully exerted by adjusting the operation parameters and other methods, so that the sludge reduction is highly realized.
(3) The ultrasonic pretreatment coupled filler microorganism enrichment activated sludge in-situ reduction process integrates the advantages of the two modes, has mutual advantages, can effectively reduce the particle size through ultrasound, reduce the subsequent anaerobic hydrolysis load, accelerate the hydrolysis rate and reduce the volume of an SSR reactor; and a good living environment is provided for anaerobic bacteria by filling the filler, and the heterotrophic bacteria in the main reactor are cooperated, so that the cell-dissolving recessive growth and the biological predation effect are fully exerted, and the sludge reduction is highly realized. The SSR volume is reduced, and the energy consumption of the physicochemical technology is controlled, so that the technical advantage complementation can be realized, and the industrial application of the sludge in-situ reduction technology is promoted.
Drawings
FIG. 1 is a schematic flow diagram of an apparatus according to the present invention;
in the figure, 1 is a water inlet pump, 2 is an anoxic tank, 3 is an aeration tank, 4 is a sedimentation tank, 5 is an ultrasonic unit, 6 is a biological decrement unit, and 7 is a metering pump.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
(1) 30% of sludge at the bottom of a sedimentation tank 4 of the main flow biological treatment assembly is firstly pumped into an ultrasonic unit 5, and the hydraulic retention time of the ultrasonic unit is 20 min. The sound energy density range of the ultrasonic device is 0.5W/ml, the operation mode is 5s, the operation is stopped for 5s, and the uniformity of the ultrasonic and the lysis effect are ensured; the concentration of the sludge entering the ultrasonic unit is 4.5g/L, and the initial sludge amount of the ultrasonic unit is 2L.
(2) 200ml of sludge after ultrasonic pretreatment enters an anaerobic side flow pool (namely a biological reduction unit) 6 filled with SPR-1 type suspended fillers. The initial amount of sludge in the anaerobic sidestream tank 6 was 2L, and the filling rate was 15%. The rotation speed in the anaerobic sidestream cell was controlled to 200 rpm. The suspended filler is in a suspended and floating state in the pool.
(3) The hydraulic retention time is ensured to be 10 days, 200ml of sludge treated by the anaerobic side flow pool 6 is led out every day by a metering pump 7 and flows back to the anoxic pool 2 of the traditional in-situ reduction process.
Through data detection and analysis, the sludge reduction rate of the ultrasonic filler adding process can reach 13.23%, and the organic matter reduction rate of the sludge can reach 17.16%. In contrast, the MLSS reduction rate of comparative example 1 (which is identical to example 1 except that no biological weight reduction cell was added) was only 4.13%, and the MLVSS reduction rate was only 6.86%. In comparison, the process of example 1 with ultrasonic added filler had a 2.2 times greater decrement than the MLSS without ultrasonic added filler and a 1.5 times greater decrement than the MLVSS without ultrasonic added filler. The weight reduction effect of the ultrasound-coupled filler in example 1 is clearly seen.
Example 2
An ultrasonic filler combined sludge reduction process is shown in figure 1 and comprises the following steps:
(1) the sewage to be treated is sequentially sent into an anoxic tank 2 and an aeration tank 3 for treatment through a water inlet pump 1, after the sludge-water mixed liquid in the aeration tank 3 enters a sedimentation tank 4 for solid-liquid separation, 5% of sludge precipitated at the bottom is pumped into an ultrasonic unit 5, and the rest of sludge is completely returned to the anoxic tank 2, wherein the ultrasonic treatment process comprises the following steps: the hydraulic retention time is 0.5min, the sound energy density during ultrasonic treatment is 0.1W/m, and the operation mode is as follows: performing ultrasound for 5s, and stopping for 5 s;
(2) after the ultrasonic unit 5 pretreats the sludge, the sludge is continuously sent into a biological decrement unit 6 for treatment, and finally is conveyed and reflows to the anoxic tank 2 through a metering pump 7. The biological decrement unit 6 comprises a biological decrement unit 6 pool and suspended filler filled in the biological decrement unit 6 pool, wherein the suspended filler is SPR-1 filler, and the filling rate of the suspended filler is 5%. The bottom of the biological decrement unit 6 is also provided with a rotating unit (such as a stirring paddle and the like) which enables the suspended filler to be in a suspended or floating state, and the rotating speed of the rotating unit is 100rpm when the biological decrement unit works. The hydraulic retention time of the bioreduction unit 6 was 1 day.
The step (1) of connecting the bottom of the aeration tank 3 back to the anoxic tank 2 through a pipeline is a process of returning nitrate to the anoxic tank 2 to be reduced into nitrogen in the conventional process.
After detection, the sludge reduction rate of the embodiment can reach 12.05%, and the organic matter reduction rate of the sludge can reach 15.62%.
Example 3
The operation was the same as that of example 2 except that all the sediment at the bottom of the sedimentation tank 4 was pumped into the ultrasonic unit 5, the hydraulic retention time of the ultrasonic unit 5 was 20min, the acoustic energy density during the ultrasonic treatment was 2W/m, the suspension filler was German sponge filler, the filling rate was 60%, the rotation speed of the rotary unit was 500rpm, and the hydraulic retention time of the biological reduction unit 6 was 15 days.
After detection, the sludge reduction rate of the embodiment can reach 15.22%, and the organic matter reduction rate of the sludge can reach 18.97%.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (6)
1. An ultrasonic filler combined sludge reduction process is implemented by adopting an ultrasonic filler combined sludge reduction device, and is characterized in that the reduction device comprises:
mainstream biological treatment subassembly: the device comprises an anoxic tank, an aeration tank and a sedimentation tank which are sequentially connected along the flowing direction of sludge, wherein the bottom of the sedimentation tank is also connected back to the anoxic tank through a pipeline; the bottom of the aeration tank is connected back to the anoxic tank through a pipeline;
and a sidestream sludge reduction component: the anaerobic treatment device comprises an ultrasonic unit and a biological reduction unit which are sequentially connected along the flowing direction of sludge, wherein the inlet of the ultrasonic unit is connected with a pipeline at the bottom of the sedimentation tank, and the outlet of the biological reduction unit is connected with the anaerobic tank in a return way;
the biological decrement unit comprises a biological decrement pool and suspended filler filled in the biological decrement pool, and a rotating unit which enables the suspended filler to be in a suspended or floating state is arranged at the bottom of the biological decrement pool;
the suspension filler is SPR-1 filler or Germany sponge filler, and the filling rate is 5-60%;
the process comprises the following steps:
(1) feeding sewage to be treated into an anoxic tank and an aeration tank in sequence for treatment, feeding sludge-water mixed liquor treated in the aeration tank into a sedimentation tank for solid-liquid separation, and then refluxing a part of sludge precipitated at the bottom into the anoxic tank and pumping the other part into an ultrasonic unit;
(2) after the ultrasonic unit pretreats the sludge, the sludge is continuously sent into a biological reduction unit for treatment, and finally the sludge flows back to the anoxic tank;
the sludge reduction type anaerobic hydrolysis microorganisms are domesticated and cultured by suspended fillers in a biological reduction tank in a biofilm formation manner, and the process of sludge reduction treatment is started and operated.
2. The ultrasonic filler combined sludge reduction process according to claim 1, wherein the biological reduction tank is an anaerobic tank;
when the rotary unit works, the rotating speed of the rotary unit is 100-500 rpm.
3. The ultrasonic filler combined sludge reduction process according to claim 1, wherein the content of the sludge discharged from the bottom of the sedimentation tank in the step (1) which is sent to the ultrasonic unit is 5-100%.
4. The ultrasonic filler combined sludge reduction process according to claim 1, wherein the hydraulic retention time in the ultrasonic unit in the step (2) is 0.5-30 min, and the acoustic energy density during ultrasonic treatment is 0.1-2W/mL.
5. The ultrasonic filler combined sludge reduction process according to claim 1, wherein the operation mode of the ultrasonic unit in the step (2) is as follows: ultrasound 5s, stop 5 s.
6. The ultrasonic filler combined sludge reduction process according to claim 1, wherein the hydraulic retention time of the biological reduction unit in the step (2) is 1-15 days.
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| CN107188310B (en) * | 2017-07-18 | 2021-06-04 | 四川理工学院 | Method for enhancing sludge reduction in anoxic-aerobic-sedimentation-anaerobic process |
| CN110963648A (en) * | 2019-12-27 | 2020-04-07 | 上海电力大学 | Sewage treatment device and process for high-sludge-concentration sludge side-stream in-situ reduction and carbon-nitrogen ratio improvement |
| CN111170462B (en) * | 2020-03-16 | 2021-05-28 | 南京大学 | Alternate starvation micro-aerobic anaerobic coupling filler sludge side flow in-situ reduction strengthening process |
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| CN101468864A (en) * | 2008-01-22 | 2009-07-01 | 北京紫石千年环保设备有限公司 | Sewage treatment method and uses thereof |
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| CN105439373A (en) * | 2014-09-28 | 2016-03-30 | 青岛诚一知识产权服务有限公司 | Sewage treatment method |
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- 2016-12-19 CN CN201611176156.0A patent/CN106698876B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101468864A (en) * | 2008-01-22 | 2009-07-01 | 北京紫石千年环保设备有限公司 | Sewage treatment method and uses thereof |
| CN102092893A (en) * | 2010-12-03 | 2011-06-15 | 北京林业大学 | Excess sludge decrement method based on cooperation of ultrasonic pretreatment and membrane bioreactor |
| CN104230111A (en) * | 2014-09-24 | 2014-12-24 | 上海城市水资源开发利用国家工程中心有限公司 | Sludge ozone oxidation and reduction device and use method thereof |
| CN105439373A (en) * | 2014-09-28 | 2016-03-30 | 青岛诚一知识产权服务有限公司 | Sewage treatment method |
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