CN212102192U - Rural sewage integrated treatment equipment switched to operate in AAO or SBBR mode - Google Patents

Abstract

The invention relates to rural sewage integrated treatment equipment switched to operate in an AAO or SBBR mode, which comprises a sewage regulating tank, wherein the sewage regulating tank is communicated with and provided with an integrated equipment body, the inside of the integrated equipment body comprises an anaerobic zone, an anoxic zone, a primary aerobic zone, a secondary aerobic zone, a sedimentation zone and an equipment room which are sequentially communicated, a water inlet submersible pump is arranged in the sewage regulating tank, the water inlet submersible pump is connected with the bottom of the anaerobic zone through a water inlet pipeline, a sludge return pipeline is communicated with a return sludge pump, one end of the sludge return pipeline is communicated with a sludge hopper, the other end of the sludge return pipeline is communicated with a water inlet of the anaerobic zone, an inner return pump is communicated with a nitrification liquid return pipeline, one end of the nitrification liquid return pipeline is communicated with a water inlet of the anoxic zone, the other end of the nitrification liquid return pipeline is communicated between the sludge hopper and an upflow inclined pipe sedimentation zone, a blower is communicated with three aeration pipelines extending into the, the effect of improving the rural sewage treatment efficiency is achieved.

Description

Rural sewage integrated treatment equipment switched to operate in AAO or SBBR mode

Technical Field

The invention relates to the technical field of sewage treatment, in particular to rural sewage integrated treatment equipment switched to operate in an AAO or SBBR mode.

Background

The annual output of rural sewage in China is about 80 hundred million tons. A large amount of sewage generated by rural residents in production and life is discharged at will, so that the rural water pollution is aggravated, and the health and ecological environment of the rural residents are seriously harmed. In recent years, the government of China pays attention to and strengthens the environmental protection of rural areas, proposes the construction of beautiful villages and takes the ecological civilization construction as the basic national policy. How to treat rural sewage with high efficiency and high quality becomes a problem to be solved urgently in the environment protection work.

Rural sewage has the characteristics of dispersed sewage distribution, large water quality fluctuation, small water quantity, unstable change coefficient and the like. The conventional sewage treatment process mainly includes AAO ("anaerobic-anoxic-aerobic" sewage treatment process), SBR (sequencing batch reactor activated sludge process) technology, and oxidation ditch technology. The oxidation ditch process is generally applied to a large-scale centralized sewage treatment plant due to the process characteristics. The AAO process adopts continuous flow water inflow, simultaneously performs nitrogen and phosphorus removal, has shorter total hydraulic retention time and is simple and convenient to operate. The SBBR (sequencing batch biofilm process) process has less residual sludge and small occupied area, and is suitable for occasions with intermittent discharge and large flow change. However, the hydraulic load of rural sewage is greatly changed, the concentration of pollutants is high, and the sewage treatment by only one sewage treatment process cannot cope with the complex situation of rural sewage, so that the treatment efficiency of rural sewage is lower.

Disclosure of Invention

The invention aims to provide rural sewage integrated treatment equipment which improves rural sewage treatment efficiency and is switched to operate in an AAO or SBBR mode.

The technical purpose of the invention is realized by the following technical scheme:

a rural sewage integrated treatment device switched to operate in an AAO or SBBR mode comprises a sewage adjusting tank, wherein the sewage adjusting tank is communicated with an integrated device body, the integrated device body internally comprises an anaerobic zone, an anoxic zone, a primary aerobic zone, a secondary aerobic zone, a sedimentation zone and a device room which are sequentially communicated, a water inlet submersible pump is arranged in the sewage adjusting tank and is connected with the bottom of the anaerobic zone through a water inlet pipeline, an ascending inclined pipe sedimentation zone is arranged at the upper part of the sedimentation zone, a sludge hopper is arranged at the lower part of the sedimentation zone, a return sludge pump, an internal return pump and a blower are arranged in the device room, a sludge return pipeline is communicated with the return sludge pump, one end of the sludge return pipeline is communicated with the sludge hopper, the other end of the sludge return pipeline is communicated with a water inlet of the anaerobic zone, a nitrified liquid return pipeline is communicated with the internal return pump, and one end of the nitrified liquid return, the other end is communicated between a sludge hopper and an upflow inclined tube sedimentation area, the blower is communicated with three aeration pipelines which extend into the bottom of the anoxic area, the bottom of the primary aerobic area and the bottom of the secondary aerobic area, and the aeration pipelines are provided with aeration valves.

Through the technical scheme, sewage is discharged into a sewage regulating tank, the sewage is primarily settled and separated in the sewage regulating tank, a water inlet submersible pump pumps the sewage into an anaerobic zone for anaerobic treatment, part of organic matters in the sewage are aminated and subjected to anaerobic phosphorus release in the process, then the sewage sequentially passes through an anoxic zone, a primary aerobic zone, a secondary aerobic zone and a settling zone, the sewage is subjected to denitrification and deoxidation in the anoxic zone, the organic matters are removed in the primary aerobic zone and the secondary aerobic zone, the nitrification and aerobic phosphorus absorption of ammonia nitrogen are carried out, after the sewage continuously enters the settling zone, as the upper part of the settling zone is an upflow inclined tube settling zone, namely, the inclined tube settling zone is an upward flow, the upper layer is effluent and enters a clear water tank, the effluent is disinfected and the lower layer is sludge and falls into a sludge hopper to achieve the purpose of sludge-water separation, meanwhile, a sludge return pipe extending into the sludge hopper can recycle part of the sludge, the returned sludge continues to act as a carrier, and on the other hand, the loss of biological bacteria in the sludge can be reduced, the ammonia nitrogen removal effect is improved, and the sewage treatment strength is further improved. Nitrifying liquid flows back to the anoxic zone through a nitrifying liquid return pipeline, so that the concentration of sludge can be effectively maintained, and the denitrification capability is improved. And this application can be as required select to open and close interior backwash pump and open the opportunity of air-blower and realize the switching of AAO mode or SBBR mode, and sewage treatment of two kinds of modes can be realized to same batch of equipment, greatly reduced sewage treatment cost to the wholeness of equipment is stronger, and occupation space is little, and sewage treatment efficiency improves greatly.

The invention is further configured to: the bottom end of the aeration pipeline extends into the bottom of the anoxic zone, the bottom of the primary aerobic zone and the bottom of the secondary aerobic zone and is communicated with an aeration disc for increasing the aeration area.

Through above-mentioned technical scheme, when needs are aerated to one-level aerobic zone and second grade aerobic zone inside, can open the air-blower, the air-blower passes through the aeration pipe with oxygen and gets into aerobic zone, and setting up of aeration dish has increased the aeration area to make one-level aerobic zone and second grade aerobic zone inside can be fast, aerate uniformly.

The invention is further configured to: and biological fillers are filled in the anoxic zone, the primary aerobic zone and the secondary aerobic zone.

Through above-mentioned technical scheme, pack the biofilm carrier in one-level aerobic zone and second grade aerobic zone, can provide the adhesion condition for aerobic microorganism, as the carrier of microorganism, the biofilm carrier plays important effect to the quantity of microorganism, the utilization ratio of oxygen, rivers condition and the contact state of sewage and biomembrane in the contact oxidation pond (being one-level aerobic zone, second grade aerobic zone), effectively improves the effect of water treatment.

The invention is further configured to: the biological filler is a waterweed-like spiral biological filler.

Through the technical scheme, the waterweed-like spiral biological filler can greatly improve the specific surface area, further improve the film forming rate and biomass, and improve the comprehensive performance of the spiral biological filler to a greater extent, so that the spiral biological filler has better biological film fixation performance, is free from agglomeration and easy to fluidize in the operation process, has the specific gravity close to water, is low in energy consumption, and has the advantage of good ventilation and water permeability.

The invention is further configured to: the filling ratio of the biological filler in the anoxic zone, the primary aerobic zone and the secondary aerobic zone is 40-60 percent.

Through the technical scheme, the filling ratio of the biological filler is 40-60%, so that good attachment conditions can be provided for aerobic microorganisms in the primary aerobic zone and the secondary aerobic zone, oxygen deficiency and blockage in the aerobic zone can not be caused, and the biofilm formation rate and biomass of the biological filler are ensured.

The invention is further configured to: the air blower is provided with two.

Through the technical scheme, the two air blowers can greatly improve the aeration quantity, so that sufficient oxygen content can be available in an aerobic area (a primary aerobic area and a secondary aerobic area) to carry out nitrification of ammonia nitrogen and aerobic phosphorus absorption, the two air blowers are arranged to improve the fault tolerance rate, when one air blower breaks down and is damaged, the other air blower can be continuously used, and the oxygen in the aerobic area can not be interrupted.

In conclusion, the beneficial technical effects of the invention are as follows:

1. by arranging the integrated equipment and simultaneously having two operation modes of AAO and SBBR, the operation modes can be switched according to actual needs, and rural sewage with large water quality and water quantity change can be treated reasonably, economically and efficiently;

2. when the reactor operates in an AAO mode, the concentration of dissolved oxygen is controlled according to the concentration of pollutants, an aeration strategy is changed, synchronous nitrogen and phosphorus removal is realized, and energy is saved;

3. when the reactor operates in an SBBR mode, the anaerobic time sequence and the aerobic time sequence are adjusted according to the concentration of pollutants, the HRT of a system is changed, the aim of synchronously removing nitrogen and phosphorus is achieved, and energy is saved.

Drawings

FIG. 1 is a schematic view of an AAO-operated integrated rural sewage treatment facility in this embodiment;

FIG. 2 is a rural sewage integrated treatment facility operated in the SBBR mode in this embodiment.

Reference numerals: 1. a sewage adjusting tank; 11. a water intake submersible pump; 111. a water inlet pipe; 2. an integrated equipment body; 3. an anaerobic zone; 4. an anoxic zone; 5. a primary aerobic zone; 6. a secondary aerobic zone; 7. a settling zone; 71. an upflow inclined tube settling zone; 711. an upward inclined tube; 72. a sludge hopper; 8. a device room; 81. a return sludge pump; 811. a sludge return line; 82. an internal reflux pump; 821. a nitrifying liquid return line; 83. a blower; 831. an aeration pipeline; 832. an aeration valve; 833. an aeration disc; 9. an overflow aperture; 10. a third-stage biochemical reaction area.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

The utility model provides a rural sewage integration treatment facility with AAO or SBBR mode switching operation, as shown in figure 1, includes sewage equalizing basin 1 and integration equipment body 2, integration equipment body 2 is inside including setting gradually and the anaerobic zone 3 that communicates in order, anoxic zone 4, one-level aerobic zone 5, second grade aerobic zone 6 and the settling zone 7, and one side that settling zone 7 deviates from second grade aerobic zone 6 is provided with equipment room 8. The sewage enters an anaerobic zone 3 for anaerobic treatment after primary sedimentation and separation in a regulating tank, then enters an anoxic zone 4 for denitrification and deoxidation, then enters a primary aerobic zone 5 and a secondary aerobic zone 6 for organic matter removal, and finally enters a settling zone 7 for sludge-water separation under the actions of ammonia nitrogen nitrification and aerobic phosphorus absorption, thereby achieving the sewage treatment effect.

Be provided with into water immersible pump 11 in the sewage equalizing basin 1, the immersible pump 11 intercommunication of intaking has inlet channel 111, and 3 bottoms in anaerobic zone are stretched into to the one end of keeping away from sewage equalizing basin 1 of inlet channel 111 for carry out preliminary sewage of adjusting in sewage equalizing basin 1 and get into anaerobic zone 3 along sewage equalizing basin 1 and carry out anaerobic treatment.

Overflowing holes 9 communicated with each other are arranged between the anaerobic zone 3 and the anoxic zone 4, between the anoxic zone 4 and the first-stage aerobic zone 5, between the first-stage aerobic zone 5 and the second-stage aerobic zone 6, and between the second-stage aerobic zone 6 and the settling zone 7, so that all the areas inside the integrated equipment body 2 can be communicated with each other. Wherein, overflowing holes 9 between the anaerobic zone 3 and the anoxic zone 4, between the anoxic zone 4 and the first-stage aerobic zone 5, and between the first-stage aerobic zone 5 and the second-stage aerobic zone 6 are located at the position of the integrated equipment body 2 close to the top end, and overflowing holes 9 between the second-stage aerobic zone 6 and the precipitation zone 7 are located at the middle lower part of the integrated equipment body 2.

The upper part of the settling zone 7 is provided with an upflow inclined tube settling zone 7 area, the lower part is provided with a sludge hopper 72, the upflow inclined tube settling zone 7 area is provided with a plurality of upward flow inclined tubes which are communicated up and down, the inclination angle of the upward flow inclined tubes is 30-60 degrees, the inclination angle is preferably 60 degrees in the embodiment, and the overflowing hole 9 between the secondary aerobic zone 6 and the settling zone 7 is positioned between the sludge hopper 72 and the upflow inclined tube settling zone 7 area. Therefore, the sewage entering the settling zone 7 flows upwards through the upward flow inclined pipe, the upper layer of the settling zone 7 is the effluent and enters the clean water tank, the effluent is obtained after disinfection, and the lower layer is the sludge and falls into the sludge hopper 72, so that the purpose of sludge-water separation is achieved.

Be provided with return sludge pump 81 in the equipment room 8, interior backwash pump 82 and two sets of air-blowers 83, the intercommunication is provided with mud return line 811 on the return sludge pump 81, the inside intercommunication of one end and sludge bucket 72 of mud return line 811, the other end communicates with the bottom in anaerobic zone 3, the partial mud that subsides in the sludge bucket 72 can flow back to inside the anaerobic zone 3 through mud return line 811, the effect of carrier is continued to be played in the partial mud of backward flow, on the other hand also can reduce the loss of biological fungus in the mud, improve the effect of getting rid of ammonia nitrogen, and then improve sewage treatment dynamics.

The internal reflux pump 82 is provided with a nitrified liquid reflux pipeline 821 in a communicated manner, one end of the nitrified liquid reflux pipeline 821 is communicated between the sludge hopper 72 and the upflow inclined tube sedimentation zone 7, the other end of the nitrified liquid reflux pipeline 821 is communicated with the overflowing hole 9 between the anaerobic zone 3 and the anoxic zone 4, and nitrified liquid flows back to the anoxic zone 4 through the nitrified liquid reflux pipeline 821, so that the concentration of sludge can be effectively maintained, and the denitrification capacity is improved.

Two air-blowers 83 set up side by side, the intercommunication has same aeration pipeline 831, aeration pipeline 831 divide into three once, extend to anoxic zone 4, one-level aerobic zone 5 and second grade aerobic zone 6 bottom respectively from last to down, aeration pipeline 831 is provided with three aeration valve 832 of control oxygen content respectively on three vertical branches, aeration pipeline 831's bottom intercommunication is provided with the aeration dish 833 that is used for increasing the aeration area.

Example 2

With reference to fig. 1, the integrated apparatus body 2 operates in an AAO mode, and domestic sewage in certain village of wujin, wu is used as an experimental object: ammonia nitrogen: 15-40 mg/L, total phosphorus: 1-8 mg/L, COD: 100-200 mg/L. The cross section of an inclined tube sedimentation zone 7 of the sedimentation tank is 1.87 m 2. The operation method comprises the following steps:

(1) water inflow: the sewage adjusting tank 1 collects rural sewage, the intake submersible pump 11 sends the collected sewage and return sludge (40-60% reflux ratio) to the integrated equipment body 2 at a flow rate of 0.1-1.5 m3/h, and the sewage enters the bottom of the anaerobic zone 3;

(2) anaerobic zone 3 treatment: the water flow of the anaerobic zone 3 is upward flow, the hydraulic retention time is 2-4 h, and part of organic matters in the water are aminated and subjected to anaerobic phosphorus release in the process;

(3) and (4) treatment in an anoxic zone: the effluent of the anaerobic zone 3 and nitrifying reflux liquid are injected into the anoxic zone 4 together, the hydraulic retention time is 2-4 h, and denitrification is carried out in the process;

(4) and (3) aerobic zone treatment: the effluent of the anoxic tank enters a primary aerobic zone 5 and a secondary aerobic zone 6 through a flow hole 9, the hydraulic retention time is 6-8 h, meanwhile, an air blower 83 aerates the aerobic zone through an aeration disc 833 arranged at the bottom of the aerobic zone (the primary aerobic zone 5 and the secondary aerobic zone 6) with the air volume of 0.2 m3/min, and the process carries out the removal of organic matters, the nitrification of ammonia nitrogen and the aerobic phosphorus absorption;

(5) a precipitation zone 7: the settling zone 7 is provided with an upflow inclined tube settling zone 7 area with the cross section of 1.87 m2, the hydraulic retention time is 1-2.8 h, the effluent water of the aerobic area is arranged at the bottom of the upflow inclined tube settling zone 7 area through a pipeline, the upflow inclined tube settling zone 7 area is upward flow, the effluent water at the upper layer enters a clean water tank, the effluent water after disinfection is discharged, and the sludge at the lower layer falls into a sludge hopper 72 to achieve the purpose of sludge-water separation. Meanwhile, the sludge reflux starting end is arranged at the lower layer of the sludge hopper 72, and the nitrified liquid reflux starting end is arranged between the inclined tube settling zone 7 and the sludge hopper 72.

When the COD of the inlet water is more than 150mg/L and the ammonia nitrogen is more than 30mg/L, a strong aeration strategy is used to control the dissolved oxygen concentration of an aerobic area to be 5-6 mg/L; when the COD of the inlet water is less than 150mg/L and the ammonia nitrogen is less than 30mg/L, a weak aeration strategy is used, and the dissolved oxygen concentration in the aerobic zone is controlled to be 4-5 mg/L.

After one month of operation, the final effluent of the example 2 reaches the first class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002).

Example 3

With reference to fig. 2, the integrated equipment body 2 is operated in SBBR mode, domestic sewage in certain village of Diwu, Tianjin is used as an experimental object, and the quality of inlet water is as follows: the ammonia nitrogen is more than 40mg/L, the total phosphorus is 1-8 mg/L, and the COD is more than 200 mg/L. The operation mode comprises the following steps:

(1) sequence 1: water is fed for 2 hours at 2.5 m3/h, and water is automatically discharged at the same time;

(2) and (2) time sequence: in the anaerobic stage for 2-4 hours, the anoxic zone 4, the primary aerobic zone 5 and the secondary aerobic zone 6 are set as SBBR third-level biochemical reaction zone 10, and an aeration system is closed in the SBBR third-level biochemical reaction zone 10 to perform denitrification and anaerobic phosphorus release;

(3) sequence 3: in the aeration period of 6-8 hours, starting an air blower 83, carrying out SBBR three-stage biochemical reaction, carrying out nitration reaction in 10, and degrading organic matters and aerobically absorbing phosphorus;

(4) the anaerobic zone 3 and the settling zone 7 act as in reference example 2.

When the COD of the inlet water is more than 300mg/L and the ammonia nitrogen is more than 50mg/L, the anaerobic stage of the time sequence 2 is adjusted to be 5 hours, the aeration stage of the time sequence 3 is adjusted to be 8 hours, and the integral HRT of the equipment is increased from 12 hours to 15 hours; when the COD of the inlet water is less than 300mg/L and the ammonia nitrogen is less than 50mg/L, the anaerobic stage of the time sequence 2 is adjusted to be 3 hours, the aeration stage of the time sequence 3 is adjusted to be 5 hours, and the integral HRT of the equipment is reduced to 10 hours from 12 hours.

After one month of operation, the final effluent of example 3 reaches the first class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002).

Example 4

The integrated equipment body 2 runs in an AAO mode, when the water quantity monitoring of the water quality and the water quantity of the incoming water is changed to be less than or equal to 10 tons/day, the ammonia nitrogen is more than 40mg/L, the COD is more than 200mg/L, and the integrated equipment body 2 is switched to an SBBR mode from the AAO mode:

(1) the water inlet pump changes continuous flow water inlet into water inlet every 10 hours for 2 hours;

(2) the anoxic zone 4 and the two-stage aerobic zone (the primary aerobic zone 5 and the secondary aerobic zone 6) are switched to SBBR operation modes, and the specific implementation process refers to example 3;

(3) the internal reflux pump 82 is turned off to stop the reflux of the nitrified liquid;

after the operation mode is switched, the biomembrane is quickly adapted to the quality of the incoming water, the nitrogen and phosphorus removal effect of the biochemical reaction zone is obvious, and after the operation mode is changed for 1 week, the quality of the outgoing water is stable and reaches the first-class A standard of pollutant discharge Standard of urban wastewater treatment plant (GB 18918-2002).

The implementation principle of the above embodiment is as follows: the AAO mode is suitable for sewage with small variation of the quality and the quantity of the incoming water, continuous flow operation is adopted, the total hydraulic retention time is short, and energy is saved by controlling the aeration intensity; the SBBR mode is suitable for sewage with large variation of the quality of incoming water, adopts intermittent flow, has strong impact resistance, but has longer total hydraulic retention time, and saves energy by controlling aeration time; because the equipment has two operation modes of AAO/SBBR, the rural sewage with large water quality and water quantity change can be treated reasonably, economically and efficiently.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (6)

1. A rural sewage integrated treatment device switched to operate in an AAO or SBBR mode comprises a sewage adjusting tank (1) and is characterized in that the sewage adjusting tank (1) is communicated with an integrated device body (2), the integrated device body (2) comprises an anaerobic zone (3), an anoxic zone (4), a primary aerobic zone (5), a secondary aerobic zone (6), a settling zone (7) and an equipment room (8) which are sequentially communicated, a water inlet submersible pump (11) is arranged in the sewage adjusting tank (1), the water inlet submersible pump (11) is connected with the bottom of the anaerobic zone (3) through a water inlet pipeline (111), an upflow inclined pipe settling zone (7) is arranged at the upper part of the settling zone (7), a sludge hopper (72) is arranged at the lower part, a return sludge pump (81), an inner return pump (82) and an air blower (83) are arranged in the equipment room (8), and a sludge return pipeline (811) is communicated with the return sludge pump (81), sludge return line (811) one end communicates in sludge hopper (72), the other end communicates in the water inlet of anaerobic zone (3), the intercommunication has nitrified liquid return line (821) on interior backwash pump (82), the one end of nitrified liquid return line (821) communicates to anoxic zone (4) water inlet, the other end communicates to between sludge hopper (72) and upflow pipe settler (7) region, the intercommunication has three aeration pipelines (831) that stretch into anoxic zone (4) bottom on air-blower (83), one-level aerobic zone (5) bottom and second grade aerobic zone (6) bottom, be provided with aeration valve (832) on aeration pipeline (831).

2. The integrated treatment equipment for rural sewage switched to operate in an AAO or SBBR mode according to claim 1, wherein the bottom end of the aeration pipeline (831) extends into the bottom of the anoxic zone (4), the bottom of the primary aerobic zone (5) and the bottom of the secondary aerobic zone (6) and is communicated with an aeration disc (833) for increasing the aeration area.

3. The integrated treatment equipment for rural sewage switched to operate in an AAO or SBBR mode according to claim 1, wherein the anoxic zone (4), the primary aerobic zone (5) and the secondary aerobic zone (6) are filled with biological fillers.

4. The integrated treatment equipment for rural sewage switched to operate in an AAO or SBBR mode according to claim 3, wherein the biological filler is a waterweed-like spiral biological filler.

5. The integrated treatment equipment for rural sewage switched to operate in AAO or SBBR mode according to claim 4, wherein the filling ratio of the biological filler in the anoxic zone (4), the primary aerobic zone (5) and the secondary aerobic zone (6) is 40-60%.

6. The integrated treatment equipment of rural sewage switched to operate by AAO or SBBR according to claim 1, wherein two blowers (83) are provided.

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