CN107188310B - Method for enhancing sludge reduction in anoxic-aerobic-sedimentation-anaerobic process - Google Patents

Method for enhancing sludge reduction in anoxic-aerobic-sedimentation-anaerobic process Download PDF

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CN107188310B
CN107188310B CN201710587370.3A CN201710587370A CN107188310B CN 107188310 B CN107188310 B CN 107188310B CN 201710587370 A CN201710587370 A CN 201710587370A CN 107188310 B CN107188310 B CN 107188310B
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CN107188310A (en
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宁欣强
唐棠
高旭
左勇
乔文文
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Sichuan University of Science and Engineering
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis

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  • Engineering & Computer Science (AREA)
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Abstract

The invention belongs to the technical field of sewage treatment, and discloses a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process. Introducing sewage into an anoxic tank to provide a carbon source for a denitrification process, allowing the sewage to flow through an aeration tank for aerobic treatment and a nitrification process, pumping a sludge-water mixture at the tail end of the aeration tank into the anoxic tank to realize denitrification, and introducing the sewage in the aeration tank into a sedimentation tank to carry out natural sedimentation to realize sludge-water separation; the method comprises the steps of pumping precipitated sludge in a sedimentation tank to an anaerobic tank, installing a stirring device and a filler device in the anaerobic tank, adding 20-30% of filler by volume into the filler device, adding sludge attachment specific surface area, and controlling the temperature and stirring speed of the anaerobic tank to realize 80% of sludge reduction effect so as to remarkably increase the sludge reduction effect of an anoxic-aerobic-sedimentation-anaerobic process. Meanwhile, the anaerobic tank is improved in an outflow mode, the outflow pipe is arranged at the tank wall, outflow is gravity overflow, energy consumption is saved, and the comprehensive utilization rate is effectively improved.

Description

Method for enhancing sludge reduction in anoxic-aerobic-sedimentation-anaerobic process
Technical Field
The invention belongs to the technical field of sewage treatment, relates to a sludge reduction technology, and particularly relates to a method for enhancing sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process.
Background
The activated sludge process is the most common biological sewage treatment technology, and more than 90 percent of municipal sewage and about 50 percent of industrial wastewater all adopt the activated sludge process to treat the sewage worldwide, but since the activated sludge process is applied to sewage treatment, a main problem is that a large amount of excess sludge is generated. The cost of sludge treatment accounts for 50% -60% of the operation cost of the whole sewage plant. And with the development of economic society, the sewage treatment capacity is increasing continuously, the treatment requirement is also increasing continuously, and a large amount of generated excess sludge is the biggest bottleneck faced by the activated sludge process.
Excess sludge disposal is part of the complete sewage treatment process and therefore efforts are being made to reduce the amount of sludge produced during the sewage treatment process, i.e. at the source. Among various sludge in-situ reduction technologies, the aerobic-settling-anaerobic (OSA) process is considered to be one of more ideal reduction ways due to the characteristics of obvious reduction effect, no need of adding any chemical agent, no secondary pollution, simple process, low energy consumption and the like.
The A + OSA process organically combines the traditional A/O denitrification process and the OSA sludge reduction process together, and can realize sludge reduction under the condition of ensuring the effluent quality. However, the process is still in the research stage, the stability and reliability of the production operation are still problematic, and according to the current status of sludge disposal, it is very necessary to enhance the sludge reduction efficiency of the a + OSA process, and currently, the practical measures for this aspect are still to be further explored.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for enhancing sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which can obviously increase the sludge reduction effect in an A + OSA process, is simple to operate and does not increase the operation cost.
The technical scheme for solving the technical problems is as follows:
a method for strengthening sludge decrement in an anoxic-aerobic-sedimentation-anaerobic process comprises the following steps:
(1) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; sewage flows into an aeration tank to carry out aerobic treatment and nitrification processes;
(2) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 150-200% of nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(3) pumping part of precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 50-100%, wherein a continuous stirring device and a filling device are arranged in the anaerobic tank, and the filling volume filling rate of the filling device is 20-30%; adjusting the temperature of the anaerobic tank and the rotating speed of the continuous stirring device, and controlling the concentration of dissolved oxygen in the anaerobic tank to be 0.2-0.3 mg/L; the sludge in the anaerobic tank stays for 5-9 hours and then is pumped to the upper part of the anoxic tank, so that the sludge backflow is realized; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Further, the sludge concentration of the aeration tank is 2500-3000 mg/L.
Furthermore, the filling device is an annular space surrounded by two concentric net cylinders, the two net cylinders and the anaerobic tank have the same circle center, and the diameter of the net cylinder with the larger outer diameter is smaller than that of the anaerobic tank; the difference between the diameters of the two net cylinders is slightly larger than the diameter of the filler; a corresponding annular cover is provided over the annular space to confine the charge within the annular space to facilitate securement of the charge.
Furthermore, the filler is made of polypropylene or polyethylene materials with a multi-fold spherical shape inside, and the specific surface area of the filler is larger, which is equivalent to increase the area of the wall of the anaerobic tank for the attachment and growth of microorganisms; the particle size of the filler is larger than the mesh diameter of the net drum.
Furthermore, the anaerobic tank is a sealing device, a vent hole is formed in the top cover of the tank, a flow outlet pipe is arranged on the wall of the tank, and the flow outlet mode is gravity overflow; the water inlet pipe of the anaerobic tank is provided with a lifting water pump.
Further, the temperature in the anaerobic tank is 20-25 ℃, and the temperature in the anaerobic tank is controlled through a water bath; the stirring speed is 100-120 r/min.
Further, the anoxic pond is in a continuous flow running state.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the filler is added into the anaerobic pool of the traditional A + OSA process, the volume filling rate of the filler is controlled to be 20-30%, the sludge attachment specific surface area is increased, the sludge reduction effect of 80% can be realized, and the sludge reduction effect of the A + OSA process is obviously increased.
2. The continuous stirring device is arranged in the anaerobic tank, dissolved oxygen in the anaerobic tank is controlled by adjusting the stirring intensity, and the dissolved oxygen is controlled to be 0.2-0.3 mg/L, so that sludge continuously flows back, the sludge reduction effect is obviously improved, and the improvement rate reaches more than 20%.
3. The invention improves the outflow mode of the anaerobic tank, the outflow pipe is arranged at the tank wall, the outflow is gravity overflow, and the energy consumption is saved.
4. The invention only needs to add a small amount of filler in the anaerobic tank, is easy to reform, does not need to add a reaction device and equipment, and keeps the sludge treatment cost unchanged.
Drawings
FIG. 1 is a schematic diagram of a conventional A + OSA process flow;
FIG. 2 is a schematic process flow diagram of the process of example 3A + OSA (T) of the present invention;
FIG. 3 is a graph showing the sludge reduction effect of the A + OSA (T) process and the conventional A + OSA process according to the embodiment of the present invention;
FIG. 4 is a diagram showing the water quality treatment effect of the A + OSA (T) process and the conventional A + OSA process in the embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
The experimental sludge is taken from the aerobic section sludge of the traditional AAO process of the cockscomb rock sewage treatment plant in Chongqing, the concentration of Mixed Liquid Suspended Solid (MLSS) anoxic zone and the aeration zone for inoculating the sludge is 3000mg/L, and the concentration of the Mixed Liquid Suspended Solid (MLSS) anoxic zone and the concentration of the Mixed Liquid Suspended Solid (MLSS) aeration zone in the anaerobic tank are 6000 mg/L.
The invention relates to a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which comprises the following steps as shown in figure 1:
(1) adding a stirring device and a filling device into an anaerobic pool of the A + OSA process, wherein the filling device is an annular space surrounded by two cylindrical stainless steel concentric net cylinders; adding a polypropylene material with a multi-fold ball shape inside between the two net cylinders, and controlling the filling ratio to be 20%; an outlet pipe is arranged at a corresponding position of the wall of the anaerobic tank and is led to the upper part of the anoxic tank;
(2) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; the sewage flows into an aeration tank for aerobic treatment and nitrification, and the sludge concentration of the aeration tank is 2500 mg/L;
(3) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 150% nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(4) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 50%, adjusting the temperature of the anaerobic tank to 20 ℃, stirring at a speed of 120r/min, and controlling the dissolved oxygen concentration in the anaerobic tank to be 0.2 mg/L; after staying for 5 hours, sludge in the anaerobic tank flows into the anoxic tank in a gravity overflow mode to realize sludge backflow; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Example 2
The experimental sludge is taken from the aerobic section sludge of the traditional AAO process of the cockscomb rock sewage treatment plant in Chongqing, the concentration of Mixed Liquid Suspended Solid (MLSS) anoxic zone and the aeration zone for inoculating the sludge is 3000mg/L, and the concentration of the Mixed Liquid Suspended Solid (MLSS) anoxic zone and the concentration of the Mixed Liquid Suspended Solid (MLSS) aeration zone in the anaerobic tank are 6000 mg/L.
The invention relates to a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which comprises the following steps as shown in figure 1:
(1) adding a stirring device and a filling device into an anaerobic pool of the A + OSA process, wherein the filling device is an annular space surrounded by two cylindrical stainless steel concentric net cylinders; adding a polypropylene material with a multi-fold ball shape inside between the two net cylinders, and controlling the filling ratio to be 20%; an outlet pipe is arranged at a corresponding position of the wall of the anaerobic tank and is led to the upper part of the anoxic tank;
(2) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; the sewage flows into an aeration tank for aerobic treatment and nitrification, and the sludge concentration of the aeration tank is 2500 mg/L;
(3) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 150% nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(4) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 50%, adjusting the temperature of the anaerobic tank to 20 ℃, stirring at a speed of 120r/min, and controlling the dissolved oxygen concentration in the anaerobic tank to be 0.2 mg/L; after staying for 5.56 hours, sludge in the anaerobic tank flows into the anoxic tank in a gravity overflow mode to realize sludge backflow; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Example 3
The experimental sludge is taken from the aerobic section sludge of the traditional AO process of the cockscomb rock sewage treatment plant in Chongqing city, the concentration of Mixed Liquid Suspended Solid (MLSS) anoxic zone and the aeration zone for inoculating the sludge is 3000mg/L, and the concentration of the Mixed Liquid Suspended Solid (MLSS) anoxic zone and the concentration of the Mixed Liquid Suspended Solid (MLSS) aeration zone in the anaerobic tank are 6000 mg/L.
The invention relates to a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which comprises the following steps as shown in figure 1:
(1) adding a filling device into an anaerobic pool of the conventional A + OSA process, wherein the filling device is an annular space surrounded by two cylindrical stainless steel concentric net cylinders; adding a polypropylene material with a multi-fold spherical shape inside between the two net cylinders, and controlling the filling ratio to be 25%; an outlet pipe is arranged at a corresponding position of the wall of the anaerobic tank and is led to the upper part of the anoxic tank;
(2) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; the sewage flows into an aeration tank for aerobic treatment and nitrification, and the sludge concentration of the aeration tank is 3000 mg/L;
(3) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 200% nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(4) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 100%, adjusting the temperature of the anaerobic tank to 25 ℃, stirring at a speed of 100r/min, and controlling the dissolved oxygen concentration of the anaerobic tank to be 0.25 mg/L; sludge in the anaerobic tank stays for 7.14 hours and then is pumped to the upper part of the anoxic tank, so that sludge backflow is realized; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Example 4
The experimental sludge is taken from the aerobic section sludge of the traditional AAO process of the cockscomb rock sewage treatment plant in Chongqing, the concentration of Mixed Liquid Suspended Solid (MLSS) anoxic zone and the aeration zone for inoculating the sludge is 3000mg/L, and the concentration of the Mixed Liquid Suspended Solid (MLSS) anoxic zone and the concentration of the Mixed Liquid Suspended Solid (MLSS) aeration zone in the anaerobic tank are 6000 mg/L.
The invention relates to a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which comprises the following steps as shown in figure 1:
(1) adding a stirring device and a filling device into an anaerobic pool of the conventional A + OSA process, wherein the filling device is an annular space surrounded by two cylindrical stainless steel concentric net cylinders; adding a polypropylene material with a multi-fold spherical shape inside between the two net cylinders, and controlling the filling ratio to be 30%; an outlet pipe is arranged at a corresponding position of the wall of the anaerobic tank and is led to the upper part of the anoxic tank;
(2) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; the sewage flows into an aeration tank for aerobic treatment and nitrification, and the sludge concentration of the aeration tank is 3000 mg/L;
(3) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 180 percent of nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(4) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 80%, adjusting the temperature of the anaerobic tank to 23 ℃, stirring at a speed of 100r/min, and controlling the dissolved oxygen concentration of the anaerobic tank to be 0.25 mg/L; the sludge in the anaerobic tank stays for 8.75 hours and then is pumped to the upper part of the anoxic tank, so that the sludge backflow is realized; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Example 5
The experimental sludge is taken from the aerobic section sludge of the traditional AAO process of the cockscomb rock sewage treatment plant in Chongqing, the concentration of Mixed Liquid Suspended Solid (MLSS) anoxic zone and the aeration zone for inoculating the sludge is 3000mg/L, and the concentration of the Mixed Liquid Suspended Solid (MLSS) anoxic zone and the concentration of the Mixed Liquid Suspended Solid (MLSS) aeration zone in the anaerobic tank are 6000 mg/L.
The invention relates to a method for strengthening sludge reduction in an anoxic-aerobic-sedimentation-anaerobic process, which comprises the following steps as shown in figure 1:
(1) adding a stirring device and a filling device into an anaerobic pool of the conventional A + OSA process, wherein the filling device is an annular space surrounded by two cylindrical stainless steel concentric net cylinders; adding a polypropylene material with a multi-fold spherical shape inside between the two net cylinders, and controlling the filling ratio to be 30%; an outlet pipe is arranged at a corresponding position of the wall of the anaerobic tank and is led to the upper part of the anoxic tank;
(2) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; the sewage flows into an aeration tank for aerobic treatment and nitrification, and the sludge concentration of the aeration tank is 3000 mg/L;
(3) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank according to the reflux ratio of 180 percent of nitrifying liquid, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(4) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank at a sludge reflux ratio of 80%, adjusting the temperature of the anaerobic tank to 23 ℃, stirring at a speed of 100r/min, and controlling the dissolved oxygen concentration of the anaerobic tank to be 0.25 mg/L; sludge in the anaerobic tank stays for 9 hours and then is pumped to the upper part of the anoxic tank, so that sludge backflow is realized; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
Comparative example
The conventional A + OSA process is used as a control group, the experimental conditions are the same, and the process flow is shown in figure 1.
Test results
Fig. 3 shows a comparison of the sludge reduction effect in the normal operation stage of the a + OSA process of example 3 of the present invention and the conventional a + OSA process, and it can be seen that the sludge reduction effect is significantly improved after the filler is added to the anaerobic tank, and the improvement rate is about 20%.
Fig. 4 shows a comparison of the water treatment effect of the normal operation stage of the a + OSA process of the embodiment 3 of the present invention and the conventional a + OSA process, and it can be seen that the addition of the filler in the anaerobic tank does not significantly affect the pollutant removal capability of the a + OSA process, and the effluent can reach the discharge standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. A method for strengthening sludge reduction of an anoxic-aerobic-sedimentation-anaerobic process is characterized by comprising the following steps: the method comprises the following steps:
(1) introducing the sewage into an anoxic tank to provide a carbon source for denitrification; sewage flows into an aeration tank to carry out aerobic treatment and nitrification processes; the sludge concentration of the aeration tank is 2500-3000 mg/L;
(2) pumping the sludge-water mixture at the tail end of the aeration tank to an anoxic tank by a 150-200% nitrification liquid reflux ratio to realize denitrification, and introducing the residual sewage in the aeration tank into a sedimentation tank for natural sedimentation to realize sludge-water separation;
(3) pumping part of the precipitated sludge in the sedimentation tank to an anaerobic tank by a sludge reflux ratio of 50-100%, wherein the anaerobic tank is a sealing device, a vent hole is formed in the top cover of the tank, a flow outlet pipe is arranged on the wall of the tank, and the flow outlet mode is gravity overflow; the anaerobic tank is internally provided with a continuous stirring device and a filling device, the filling device is an annular space surrounded by two concentric net cylinders, the two net cylinders and the anaerobic tank have the same circle center, and the diameter of the net cylinder with the larger outer diameter is smaller than that of the anaerobic tank; a corresponding annular cover is arranged above the annular space so as to limit the filler in the annular space; the filler is a polypropylene or polyethylene material with a multi-fold spherical inner part, and the particle size of the filler is larger than the mesh diameter of the net drum; the filling volume filling rate of the filling material in the filling device is 20-30%; adjusting the temperature of the anaerobic tank to be 20-25 ℃, controlling the dissolved oxygen concentration of the anaerobic tank to be 0.2-0.3 mg/L, wherein the rotating speed of the continuous stirring device is 100-; the sludge in the anaerobic tank stays for 5-9 hours and then is pumped to the upper part of the anoxic tank, so that the sludge backflow is realized; and discharging the residual sludge in the sedimentation tank through a sludge discharge pipe.
2. The method for enhancing sludge reduction in an anoxic-aerobic-precipitation-anaerobic process according to claim 1, wherein: the anoxic tank is in a continuous flow running state.
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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
CN112759083B (en) * 2021-01-12 2022-07-08 中山大学 Sludge source reduction device and sludge source reduction process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101544423A (en) * 2009-04-29 2009-09-30 重庆大学 A/O denitrification sewage treatment process and device capable of realizing sludge reduction
CN202337723U (en) * 2011-11-21 2012-07-18 傅剑锋 Sludge reduction treatment device
CN106698876A (en) * 2016-12-19 2017-05-24 上海电力学院 Ultrasonic/filler combined sludge decrement device and process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101544423A (en) * 2009-04-29 2009-09-30 重庆大学 A/O denitrification sewage treatment process and device capable of realizing sludge reduction
CN202337723U (en) * 2011-11-21 2012-07-18 傅剑锋 Sludge reduction treatment device
CN106698876A (en) * 2016-12-19 2017-05-24 上海电力学院 Ultrasonic/filler combined sludge decrement device and process

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