CN216039136U - Integrated double-circulation oxidation ditch sewage treatment device - Google Patents
Integrated double-circulation oxidation ditch sewage treatment device Download PDFInfo
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Abstract
The utility model discloses an integrated double-circulation oxidation ditch sewage treatment device, which comprises an anaerobic zone, an anoxic zone, an aerobic zone and a secondary sedimentation tank which are communicated in sequence; the anoxic zone comprises a first anoxic zone and a second anoxic zone; the aerobic zone comprises a first aerobic zone and a second aerobic zone, and a reflux pump is arranged between the anoxic zone and the aerobic zone. Diving stirrers are arranged in the anaerobic zone, the anoxic zone and the aerobic zone, and partition walls and guide walls are arranged in the anoxic zone and the aerobic zone to form circulation in respective sections; the synchronous denitrification dephosphorization of the nitrate nitrogen is realized in the anoxic zone, thereby achieving the purposes of stably removing organic pollutant COD and nitrogen and phosphorus, improving the COD removal effect and improving the nitrification denitrification nitrogen and phosphorus removal efficiency. The integrated structure of the device has the characteristics of simple structure operation and low cost, and can further reduce the investment and the operation cost.
Description
Technical Field
The utility model belongs to the field of wastewater treatment, and particularly relates to an integrated double-circulation oxidation ditch sewage treatment device.
Background
With the rapid development of social economy and the increasing population, the consumption of resources and energy is accelerated to a certain extent. The continuous deterioration of water environment caused by the industrialized development and the unreasonable grazing and the like leads to the shortage of available fresh water resources, and the water supply problem becomes a problem to be solved urgently in many countries.
The shortage of water resources poses a serious threat to the development of the human society. The recovery and reuse of wastewater is considered to be the best strategy to meet current and future water demand. The environmental protection consciousness of the public and the government is enhanced, and the sewage treatment capacity of China is also rapidly expanded. Wastewater treatment involves primary, secondary and sometimes advanced treatment processes using various biological, physical and chemical techniques. At present, the sewage treatment process adopted by sewage treatment plants in China comprises a conventional activated sludge method and anaerobic-anoxic-aerobic (A)2O), anaerobic-aerobic (A/O), Sequencing Batch Reactor (SBR), oxidation ditch, etc. The treatment efficiency of a sewage treatment plant is not only related to the process but also to the scale of the sewage treatment plant. The discharge and treatment efficiency of sewage and sewage treatment facilities varies from region to region. The influence of different treatment technologies on sludge utilization is on the rise in China. Economic growth is faster in the eastern region, especially Zhejiang and Jiangsu, due to the heterogeneous nature of economic development. This variability depends on many factors, including the large population in china (14.1 billion), rapid economic growth, industrialization, urbanization, and insufficient infrastructure investment. However, government investment is mainly used for construction and operation of sewage treatment plants, and has the defects of long construction period, high cost, high energy consumption and the like. These disadvantages therefore mean that the sewage treatment plant cannot meet the required discharge standards.
With the acceleration of the urbanization and industrialization process, a large amount of nutrient substances containing nitrogen, phosphorus and the like exist in the domestic sewage discharged by people, so that algae and other plankton are rapidly propagated, the eutrophication of the water body is accelerated, and great harm is caused to the health and aquatic ecological environment of people. Therefore, the research on the denitrification and dephosphorization technique of the domestic sewage is paid more attention and attention by the water treatment community. Therefore, the utility model aims to provide an integrated double-circulation oxidation ditch sewage treatment device facility which is low in energy consumption, economical and applicable.
Luo et al, which have been studied about activated sludge from a municipal sewage treatment plant, have studied the sequencing of bacterial community-specific genes in the oxidation ditch system of a sewage treatment plant operating well in cold regions (Xinjiang) by using the high-throughput 16srrna technique. The result shows that the temperature of the inlet water in winter and spring is 7-12 ℃, the temperature of the inlet water in summer is 13-17 ℃, and the Sludge Volume Index (SVI) of the sample is 51-74 ml/g. Chemical Oxygen Demand (COD), average removal rate of biochemical oxygen demand (BOD5), suspended matters (SS), ammonia nitrogen (NH4+ -N), Total Nitrogen (TN) and total phosphorus (TN) are 94%, 95%, 91%, 73% and 89% respectively, while Chemical Oxygen Demand (COD), average removal rate of biochemical oxygen demand (BOD5), ammonia nitrogen (NH4+ -N), Total Nitrogen (TN) and total phosphorus (TN) are 94.2%, 98.26%, 98.25%, 72.2% and 91.87% respectively. The values of the parameters of the other indicators, except for a slightly lower total nitrogen parameter value, were higher than those of the Luo et al study (Bacterial community structure in activated slice).
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of ammonia nitrogen load in domestic sewage and water body environment and high inflow concentration of COD, BOD, ammonia nitrogen, TN and TP of comprehensive wastewater, the utility model aims to provide integrated double-circulation oxidation ditch sewage treatment equipment, which can effectively reduce the ammonia nitrogen load and can be used as circulating water for replenishing water for recycling after treatment.
The purpose of the utility model is realized by at least one of the following technical schemes:
the integrated double-circulation oxidation ditch sewage treatment device comprises an anaerobic zone, an anoxic zone, an aerobic zone and a secondary sedimentation tank which are sequentially communicated; the anoxic zone comprises a first anoxic zone and a second anoxic zone; the aerobic zone comprises a first aerobic zone and a second aerobic zone, and a reflux pump is arranged between the anoxic zone and the aerobic zone. In the anoxic zone, sewage mixed liquor input from the anaerobic zone is mixed with return sludge input through an internal reflux pump, the return sludge containing a large amount of nitrate nitrogen in the aerobic zone is mixed under the action of a submersible stirrer, and the aim of stably removing the nitrate nitrogen in the sewage mixed liquor is fulfilled in the adsorption and metabolism processes of denitrifying bacteria on organic matters by utilizing the anoxic environment, so that the removal effect of ammonia nitrogen and total nitrogen is promoted.
Preferably, the anaerobic zone is provided with a water inlet, the anaerobic zone and the anoxic zone are provided with a first communicating port, the anoxic zone and the aerobic zone are provided with a second communicating port, and a third communicating port is arranged between the aerobic zone and the secondary sedimentation tank.
Further preferably, the first communication port is arranged at the lower end of a partition wall between the anaerobic zone and the anoxic zone; the second communicating port is arranged at the lower end of a partition wall between the anoxic zone and the aerobic zone; the third through hole is arranged at the lower end of the partition wall between the aerobic zone and the anaerobic zone of the secondary sedimentation tank and the anoxic zone.
Preferably, a first guide wall is arranged between the first anoxic zone and the second anoxic zone; a second guide wall is arranged between the first aerobic zone and the second aerobic zone;
preferably, the aerobic zone is provided with a partition wall, and the partition walls of the first aerobic zone and the second aerobic zone are respectively provided with a self-suction plug flow aerator to form circulating flow between the first aerobic zone and the second aerobic zone; the effects of enhancing the denitrification and dephosphorization and removing organic pollutants are achieved. The self-suction plug flow aerator is arranged at two ends of the partition wall of the aerobic zone, so that the energy consumption of the aeration fan can be saved, and the maintenance time and the maintenance cost in the operation process of the aeration system can be reduced.
Preferably, the aerobic zone is provided with an aeration fan for aeration of the aerobic tank.
Preferably, the secondary sedimentation tank is provided with a water outlet channel, a sludge outlet, an emptying pipe and a return channel, the water outlet channel is provided with a water outlet, and a sludge return pipe is arranged between the return channel and the anaerobic zone; the water outlet channel and the return channel are arranged at two ends of the upper part of the secondary sedimentation tank;
preferably, the bottom of the secondary sedimentation tank is provided with an emptying pipeline for sludge discharge or maintenance; all treatment areas are integrally built, sewage mixed liquid is conveyed through the communicating ports, occupied area for building structures and the amount of laid pipelines are reduced, head loss is reduced, construction of middle lifting facilities is reduced, and investment and operating cost are reduced.
Preferably, a first submersible stirrer is installed in the anaerobic zone, a second submersible stirrer is installed in the anoxic zone, and a third submersible stirrer is installed in the aerobic zone;
preferably, the internal reflux pump is a propeller pump with large flow and low lift. Not only reduces the energy consumption of backflow in the operation process, but also can be installed on the pool wall, and saves the investment for building the backflow pump station.
Preferably, the water outlet channel is provided with a water collecting tank, and the water collecting tank is used for collecting supernatant obtained after mud-water separation in the secondary sedimentation tank to the water outlet channel;
preferably, a foam scraping and rope sucking machine is arranged in the secondary sedimentation tank; the device is provided with a sludge return pump for returning sludge to the return channel.
Preferably, the sludge subjected to sludge-water separation is settled to the middle-lower part of the secondary sedimentation tank, the sludge pump lifts the sludge into the return channel in the reciprocating motion process of the foam scraping and rope sucking machine, and a sludge return pipe is arranged between the return channel and the anaerobic zone and has the function of forming return flow by utilizing the liquid level difference between the return channel and the anaerobic zone, so that the construction investment and the operation cost for constructing a return pump room are reduced.
In the utility model, after passing through the double-circulation oxidation ditch device, the average COD (chemical oxygen demand) concentration is reduced from 341.5mg/L to 19.7mg/L, the average removal rate is 94.2 percent, and the COD load of a sewage station is reduced; the average BOD concentration is reduced from 149.6mg/L to 2.58mg/L, and the average removal rate is 98.2 percent; the average ammonia nitrogen concentration is reduced from 33.4mg/L to 0.57mg/L, the average removal rate is 98.2 percent, the average TN concentration is reduced from 41.7mg/L to 11.4mg/L, and the average removal rate is 72.2 percent; the average concentration of TP is reduced from 3.17mg/L to 0.24mg/L, and the average removal rate is 91.8 percent.
Compared with the prior art, the utility model has the following advantages and effects:
(1) the town sewage integrated double-circulation oxidation ditch sewage treatment device has the characteristics of simple operation and low cost, can further reduce the investment and the operation cost, and improves the economic benefit;
(2) the utility model reduces the original COD, BOD, ammonia nitrogen, TN and TP concentration entering the sewage plant, effectively improves the removal rate of the wastewater, and creates suitable conditions for the subsequent denitrification treatment of the wastewater.
Drawings
FIG. 1 is a device diagram of an integrated urban sewage dual-circulation oxidation ditch sewage treatment device of the utility model;
FIG. 2 is a COD concentration change diagram of the town sewage integrated double-circulation oxidation ditch sewage treatment device of the utility model after being started for 120 days;
FIG. 3 is a BOD concentration change diagram of the town sewage integrated double-circulation oxidation ditch sewage treatment device of the utility model after being started for 120 days;
FIG. 4 is a graph showing the change of ammonia nitrogen concentration after the town sewage integrated double-circulation oxidation ditch sewage treatment device is started for 120 days;
FIG. 5 is a TN concentration change diagram of the town sewage integrated double-circulation oxidation ditch sewage treatment device of the utility model after being started for 120 days;
FIG. 6 is a TP concentration change diagram of the town sewage integrated double-circulation oxidation ditch sewage treatment device of the utility model after being started for 120 days;
symbolic illustration in the drawings:
a1-an anaerobic zone, B1-a first anoxic zone, B2-a second anoxic zone, C3-a first aerobic zone, C4-a second aerobic zone and a D-secondary sedimentation tank;
1-water inlet, 2-first submersible mixer, 3-first communicating port, 4-second submersible mixer, 5-first guide wall, 6-second communicating port, 7-reflux pump, 8-plug flow aerator, 9-second guide wall, 10-third submersible mixer, 11-aeration fan, 12-third communicating port, 13-sludge outlet and emptying pipe, 14-reflux channel, 15-sludge reflux pipe, 16-foam scraping and rope sucking machine, 17-water collecting tank and 18-water outlet channel.
Detailed Description
The present invention is further described with reference to the following drawings and examples, which should not be construed as limiting the scope of the utility model.
Example 1
The town sewage integrated double-circulation oxidation ditch sewage treatment device shown in the figure 1 comprises an anaerobic zone A1, an anoxic zone (B1, B2), an aerobic zone (C3, C4) and a secondary sedimentation tank D; the anoxic zones (B1, B2) comprise a first anoxic zone B1, a second anoxic zone B2; the aerobic zones (C3, C4) comprise a first aerobic zone C3, a second aerobic zone C4;
a water inlet 1 is formed in the anaerobic zone A1, a first communicating port 3 is formed in the lower end of a partition wall between the anaerobic zone A1 and the anoxic zone (B1, B2), a second communicating port 6 is formed in the lower end of a partition wall between the anoxic zone (B1, B2) and the aerobic zone (C3, C4), and a third communicating port 12 is formed in the lower end between the aerobic zone (C3, C4) and the secondary sedimentation tank D; a first guide wall 5 is arranged in the anoxic zone (B1, B2), a second guide wall 9 is arranged in the aerobic zone (C3, C4), two partition walls are arranged between the aerobic zones (C3, C4), two self-suction plug flow aerators 8 are respectively added at two ends of each partition wall, the secondary sedimentation tank D is provided with a water outlet channel 18, a sludge outlet, a emptying pipe 13 and a return channel 14, and the water outlet channel 18 and the return channel 14 are arranged at two ends of the upper part of the secondary sedimentation tank D; a water outlet is formed in the water outlet channel 18, a sludge return pipe 15 is arranged between the return channel 14 and the anaerobic zone A1, and an emptying pipeline is arranged at the bottom of the secondary sedimentation tank; all treatment areas are integrally built, and sewage mixed liquid is conveyed through the communicating ports, so that the occupied area for building the structures and the laying amount of pipelines are reduced, the head loss is reduced, the construction of middle lifting facilities is reduced, and the investment and the operating cost are reduced;
a first submersible stirrer 2, a second submersible stirrer 4 and a third submersible stirrer 10 are respectively arranged in the anaerobic zone A1, the anoxic zone (B1, B2) and the aerobic zone (C3, C4);
an inner reflux pump 7 is arranged on the partition wall of the aerobic zone (C3, C4) and the anoxic zone (B1, B2), the inner reflux pump 7 adopts a propeller type pump with large flow and low lift, so that the reflux energy consumption is reduced in the operation process, and the inner reflux pump can be arranged on the pool wall, so that the investment for building a reflux pump station is saved;
partition walls are arranged between the aerobic zones (C3 and C4), two self-suction plug flow aeration machines 8 aeration systems are respectively added at two ends of each partition wall, the self-suction plug flow aeration machines 8 are arranged at two ends of the partition walls of the aerobic zones (C3 and C4), so that the energy consumption of aeration fans can be saved, and the maintenance time and the maintenance cost in the operation process of the aeration systems can be reduced; the aerobic zone is provided with an aeration fan 11 for aeration of the aerobic tank.
The water outlet channel 18 is provided with a water collecting tank 17 which is used for collecting supernatant liquid obtained after mud-water separation in the secondary sedimentation tank D to the water outlet channel;
a foam scraping and rope sucking machine 16 is arranged in the secondary sedimentation tank D; the device is provided with a sludge recirculation pump for recirculating sludge to the recirculation channel 14.
Example 2
The method for treating sewage by using the town sewage integrated double-circulation oxidation ditch sewage treatment device comprises the following steps:
1) sewage enters an anaerobic zone A1 from a water inlet 1 through a conveying pipeline of a pipe network, and under the plug flow action of a first submersible stirrer 2, the sewage mixed liquor utilizes an anaerobic environment to release phosphorus in phosphorus accumulating particles in the sewage mixed liquor in the metabolic process of anaerobic flora to organic matters, so that necessary conditions are provided for the next excess phosphorus absorption process in aerobic zones (C3 and C4); meanwhile, the sewage mixed liquor entering through the return pipe 15 ensures the sludge concentration required in the biochemical process of the integrated dual-circulation oxidation ditch; the sludge mixed liquor which finishes the anaerobic treatment process enters the anoxic zone (B1, B2) through the first communicating port 3;
2) in the anoxic zone (B1, B2), the sewage mixed liquor input from the anaerobic zone A1 is mixed with return sludge containing a large amount of nitrate nitrogen in the aerobic zone (C3, C4) input through the internal reflux pump 7 under the action of the second submersible stirrer 4, and the purpose of stably removing the nitrate nitrogen in the sewage mixed liquor is realized by utilizing the circulating flow of an anoxic environment in the adsorption and metabolism process of denitrifying bacteria on organic matters, so that the removal effect of ammonia nitrogen and total nitrogen is promoted; the sewage mixed liquid after completing the anoxic treatment process enters an aerobic zone (C3, C4) through the second communicating port 6 under the pushing action of the submersible stirrer 4;
3) under the action of the second submersible mixer 10, the sewage mixed liquid entering the aerobic areas (C3, C4) utilizes the circulation flow of the aerobic environment to realize BOD and COD in the sewage mixed liquid in the process of the adsorption and metabolism of organic matters by the aerobic florascrThe carbon source pollutants are removed, and carbon dioxide and water are generated simultaneously; after the nitrogen source pollutants in the sewage mixed liquor are converted into nitrate nitrogen through nitrification in an aerobic environment, the nitrate nitrogen again flows back into the anoxic zone (B1, B2) through the internal reflux pump 7, namely, after the cyclic and repeated process of the step B, the purpose of removing the nitrogen source pollutants in the sewage mixed liquor is completed through nitrification and denitrification, and in the process, carbon dioxide, nitrogen, ammonia and water are generated; meanwhile, after the phosphorus-accumulating bacteria excessively absorb the phosphorus element released in the anaerobic environment in the aerobic environment, the phosphorus-accumulating bacteria are adsorbed to suspended matters in sewage mixed liquor and sediment substances formed in the biochemical process, and then are discharged along with sludge in the next sludge-water separation process; the generated gases are discharged out of the structures; the above-mentioned anaerobic A1, anoxic (B1, B2) and aerobic (C3, C4) treatment processes, together with the simultaneous internal reflux and residual sludge reflux processes, complete the cyclic repetition A of the sewage mixed liquor2After the biochemical treatment, various pollutants in the sewage mixed liquid are subjected to reduction treatment; wherein, the wastewater enters the secondary sedimentation tank D through the third communication port 12;
4) the flow area of the sewage mixed liquor entering the secondary sedimentation tank D is greatly increased, the flow speed is reduced, a good mixed liquor biological flocculating constituent is formed, the sludge sedimentation speed and the sludge-water separation effect of the secondary sedimentation tank D are improved, and supernatant liquid obtained by sludge-water separation enters the water outlet channel 18 after being collected by the water collecting tank 17 and is discharged to a clean water tank through the water outlet via the water discharge pipeline;
5) and the sludge separated from the mud and the water is settled to the middle lower part of the secondary sedimentation tank D, the sludge pump lifts the sludge into a return channel 14 in the reciprocating motion process of the foam scraping and rope sucking machine 16, a sludge return pipe 15 is arranged between the return channel 14 and the anaerobic zone A1, and the sludge return pipe has the function of forming return flow by utilizing the liquid level difference between the return channel 14 and the anaerobic zone A1, so that the construction investment and the operation cost for constructing a return pump room are reduced.
In the embodiment, a newly designed town sewage integrated double-circulation oxidation ditch sewage treatment device demonstration project is adopted, the sewage treatment scale is 10000 tons/day, the hydraulic retention time HRT is 8-12 days, and the sludge age is as follows: SRT 15-22 days, mixed liquor concentration: MLSS 3000-4500mg/l, sludge load: fw is 0.1-0.2KgBOD5The reflux ratio of the aerobic zone C to the anoxic zone B is 150-100 percent and the reflux ratio of the sludge is 50-100 percent.
As can be seen from fig. 2, 3, 4, 5 and 6: under the normal production condition, the original average COD concentration of the sewage plant is 341.5mg/L, the average BOD concentration is 149.6mg/L, the average ammonia nitrogen concentration is 33.4mg/L, the average TN concentration is 41.7mg/L and the average TP concentration is 3.17 mg/L. After the treatment by the equipment, the COD concentration is greatly reduced to 19.7mg/L compared with the prior art, the BOD average concentration of the wastewater is greatly reduced to 2.58mg/L, the ammonia nitrogen average concentration is greatly reduced to 0.57mg/L, the TN average concentration is greatly reduced to 11.4mg/L, and the TP average concentration is also greatly reduced to 0.24 mg/L. The average removal rate is improved from 72% to 98%, which is beneficial to providing sufficient carbon source for denitrification. The operation cost of the sewage treatment station is reduced, and the economic benefit is improved.
The denitrification dephosphorization effect of the nitro nitrogen is realized in the anoxic zone, so that the purposes of stably removing organic pollutant COD and denitrifying dephosphorization are achieved, the COD removal effect is improved, the nitrification denitrification and dephosphorization efficiency are improved, and the indexes of main pollutants of the effluent of the tank body reach or are superior to the national and A standards; the integrated structure of the pool body has the characteristics of simple operation and low cost, and can further reduce the investment and the operation cost.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The integrated double-circulation oxidation ditch sewage treatment device is characterized by comprising an anaerobic zone (A1), an anoxic zone, an aerobic zone and a secondary sedimentation tank (D) which are communicated in sequence; the anoxic zone comprises a first anoxic zone (B1), a second anoxic zone (B2); the aerobic zone comprises a first aerobic zone (C3) and a second aerobic zone (C4), and a reflux pump (7) is arranged between the anoxic zone and the aerobic zone.
2. The integrated double-circulation oxidation ditch sewage treatment device according to claim 1, characterized in that the anaerobic zone (A1) is provided with a water inlet (1), the anaerobic zone (A1) and the anoxic zone are provided with a first communicating port (3), the anoxic zone and the aerobic zone are provided with a second communicating port (6), and a third communicating port (12) is arranged between the aerobic zone and the secondary sedimentation tank (D).
3. The integrated dual-circulation oxidation ditch sewage treatment plant according to claim 2, characterized in that the first communication port (3) is arranged at the lower end of the partition wall between the anaerobic zone (A1) and the anoxic zone; the second communicating port (6) is arranged at the lower end of a partition wall between the anoxic zone and the aerobic zone; the third communication port (12) is arranged at the lower end of a partition wall between the aerobic zone and the anaerobic zone of the secondary sedimentation tank (D) and the anoxic zone (C).
4. The integrated double-circulation oxidation ditch sewage treatment device of claim 1, wherein a first guide wall (5) is arranged between the first anoxic zone (B1) and the second anoxic zone (B2); a second guide wall (9) is arranged between the first aerobic zone (C3) and the second aerobic zone (C4).
5. The integrated double-circulation oxidation ditch sewage treatment device of claim 1, wherein the aerobic zone is provided with a partition wall, and self-suction type plug-flow aerators (8) are respectively arranged on the partition walls of the first aerobic zone (C3) and the second aerobic zone (C4) to form a circulating flow between the first aerobic zone (C3) and the second aerobic zone (C4); the aerobic zone is provided with an aeration fan (11) for aeration of the aerobic tank.
6. The integrated dual-circulation oxidation ditch sewage treatment device according to claim 1, wherein the secondary sedimentation tank (D) is provided with an outlet channel (18), a sludge outlet, an emptying pipe (13) and a return channel (14), the outlet channel (18) is provided with a water outlet, and a sludge return pipe (15) is arranged between the return channel (14) and the anaerobic zone (A1); the water outlet channel (18) and the return channel (14) are arranged at two ends of the upper part of the secondary sedimentation tank (D); and an emptying pipeline is arranged at the bottom of the secondary sedimentation tank (D) and is used for discharging sludge or overhauling.
7. The integrated dual cycle oxidation ditch sewage treatment plant of claim 1, wherein a first submersible mixer (2) is installed in the anaerobic zone (A1), a second submersible mixer (4) is installed in the anoxic zone, and a third submersible mixer (10) is installed in the aerobic zone.
8. The integrated dual-circulation oxidation ditch sewage treatment plant according to claim 1, characterized in that the internal reflux pump (7) is a propeller pump with high flow and low lift.
9. The integrated sewage treatment plant of the dual-circulation oxidation ditch according to claim 6, wherein the water outlet channel (18) is provided with a water collecting tank (17) which is used for collecting supernatant liquid obtained after mud-water separation in the secondary sedimentation tank (D) to the water outlet channel.
10. The integrated double-circulation oxidation ditch sewage treatment device according to claim 1, characterized in that a foam scraping rope absorbing machine (16) is installed in the secondary sedimentation tank (D); the device is provided with a sludge return pump for returning sludge to the return channel (14).
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