CN210974309U - Strengthen biochemical treatment pond of activated sludge process sewage - Google Patents
Strengthen biochemical treatment pond of activated sludge process sewage Download PDFInfo
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- CN210974309U CN210974309U CN201921288224.1U CN201921288224U CN210974309U CN 210974309 U CN210974309 U CN 210974309U CN 201921288224 U CN201921288224 U CN 201921288224U CN 210974309 U CN210974309 U CN 210974309U
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- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
The utility model provides a strengthen activated sludge process sewage biochemical treatment pond, including the district that mixes in advance that intakes, main aeration district, at least one air stripping device, water distribution facility, clarification district, return channel, wherein: the front end of the water inlet premixing area is provided with a water inlet, the tail end of the water inlet premixing area is communicated with the front end of the main aeration area, and the bottom of the water inlet premixing area is provided with a micropore aeration system; the air lifting device is arranged at the tail end of the main aeration area, the water distribution facility is arranged behind the air lifting device, the water distribution facility is respectively communicated with the front end of the water inlet premixing area and the front end of the backflow channel, and the tail end of the backflow channel is communicated with the front end of the main aeration area; the clarifying area is arranged above or beside the backflow channel and is provided with a water outlet channel; compare in traditional biochemical treatment pond, the utility model discloses a configuration is intake and is thoughtlessly distinguished in advance, will intake and give certain dwell time after the part circulation backward flow intensive mixing, reentrant main aeration district, and the whole pond adopts accurate dissolved oxygen control simultaneously, further strengthens sludge activity, improves activated sludge's pollutant degradation efficiency to reach better play water quality.
Description
Technical Field
The utility model relates to the technical field of sewage biochemical treatment, in particular to a reinforced activated sludge process sewage biochemical treatment tank.
Background
In 1914, E.Ardern and W.T. L ockett created an activated sludge process, in the fifth and sixty years of the last century, relevant theories were created and developed, and in the past decades, the classical biochemical water treatment process was continuously improved, from international conventional technologies (A/O, AAO, 2-level or three-level biochemical treatment, SBR and the like) to various new technologies, the stability of the activated sludge method is continuously improved, relevant parameters (sludge suspension solid concentration, volume load, oxygen transfer rate and the like) are improved, and the activated sludge method is also applied in a large scale.
At present, the requirement of China on sewage treatment is continuously improved due to the improvement of objective requirements and technical levels of the environment, and the requirement of China on sewage treatment is continuously improved from 120 mg/L to 50 mg/L or even lower from the integrated wastewater discharge standard (GB 8978-88) for thirty years, and the requirement on the effluent indexes of TN and TP is continuously improved.
In order to meet the standard-raising requirement, a process flow of secondary reinforcement and advanced treatment is often selected in a sewage treatment plant, and in order to make the effluent quality better or meet the special requirement of certain indexes (such as TN less than 10 mg/L), a deep-bed denitrification advanced treatment process is also added.
For the denitrification process alone, many people have one such assumption: why does not directly utilize the BOD in the feed water for denitrification? In fact, classical pre-denitrificationThe process has tried in this respect, the anoxic tank is set up before the aerobic tank, and a large amount of NO is formed in the aerobic tank3 —And the N flows back to the anoxic tank, and the denitrification process is realized by using the electron equivalent of BOD in the inlet water without adding a large amount of carbon sources additionally. This typical process can reduce aeration and agent costs, but because the amount of recirculation required is too large (enough NO is added)3N brought back to the anoxic tank) which greatly increases the cost of piping and pumps and also does not degrade the contaminants to the utmost.
Even though the simultaneous nitrification and denitrification of 100% nitrogen removal by Rittmann and L angeland applied in the 1985 has been reported, the successful case parameter design in the past is extremely conservative and has no parameter combination for ensuring the stable and reliable operation of the system, meanwhile, according to the related theory of SND, the nitrifying bacteria need to grow and propagate in the environment with low DO or even zero DO, and the sludge age is longer (providing a greater safety factor), so that the high M L SS concentration is needed, and the high sludge concentration of the 'health' is difficult to maintain.
In 2006, 3, Wilke Engelbart, germany, published a new process, BioDopp (also translated domestically as "bio-doubling"), the most impressive important traits being: very low dissolved oxygen concentrations were maintained throughout the biochemical aeration tank and extensive practice demonstrated that nitrification reactions continued to occur under very low DO conditions.
In response to the market and technical development requirements, it is hoped that a sludge can be cultured in a biochemical pond, nitrification, denitrification and COD degradation can be synchronously carried out, and phosphorus in water can be removed through phosphorus accumulation and phosphorus release. Under the large environment of continuous improvement in various places, the removal rate of COD and TN is required to be close to 100%. The utility model provides a strengthen activated sludge process sewage treatment process to low dissolved oxygen, high sludge concentration, low sludge load are surface characteristics, and the essence is the synchronous nitrification and denitrification (or integrate the denitrification process into the nitration) technology of improvement sludge activity, and the treatment effect is superior, and it can reach extremely low pollutant concentration to go out water under ideal state, like earth's surface II class water standard.
SUMMERY OF THE UTILITY MODEL
The utility model provides a reinforced activated sludge process sewage biochemical treatment tank; the reinforced activated sludge process sewage biochemical treatment tank comprises: the system comprises a water inlet premixing area, a main aeration area, at least one air lifting device, a water distribution facility, a clarification area and a backflow channel, wherein:
the front end of the water inlet premixing area is provided with a raw water inlet, the tail end of the water inlet premixing area is communicated with the front end of the main aeration area, and the bottom of the water inlet premixing area is provided with a micropore aeration system;
the air lifting device is arranged at the tail end of the main aeration area, the water distribution facility is arranged behind the air lifting device, the water distribution facility is respectively communicated with the front end of the water inlet premixing area and the front end of the backflow channel, and the tail end of the backflow channel is communicated with the front end of the main aeration area;
the clarifying area is arranged above or beside the backflow channel and is communicated with the backflow channel, and the clarifying area is provided with a water outlet channel for discharging clarified and separated water;
after the sludge-water mixture in the main aeration area is pushed by the air lifting device and is distributed by the water distribution facility, a small part of the sludge-water mixture is mixed with raw water flowing in from the water inlet, enters the water inlet premixing area, finally flows into the main aeration area through the water inlet premixing area, and the rest of the sludge enters the return channel, is screened and intercepted by sludge in the clarification area, and then enters the main aeration area through the return channel.
Furthermore, a micropore aeration system adopting an intermittent aeration mode is arranged at the bottom of the water inlet premixing area, and a micropore aeration system adopting an intermittent aeration mode is also arranged in the main aeration area.
Preferably, the micro-pore aeration system of the water inlet premixing area and the micro-pore aeration system of the main aeration area respectively comprise a micro-pore aeration device and an automatic control device.
Further, the return channel is provided with a sludge purging device.
Further, a sludge hopper is arranged at the bottom of the tank at the tail end of the return channel.
The utility model discloses intake raw water and the interior material mixing position setting of reaction tank behind the water distribution facility, intake and mix the district front end in advance, the mixed liquid that pushes away the flow through the air stripping device is got back to in the main aeration district through the backward flow passageway and the intake of clarification district below respectively in advance mixed the district.
First, in order to complete the large circulation in the biochemical tank (municipal sewage is generally more than 15 times of the circulation volume, sometimes up to 50 times), the tail end of the main aeration zone is provided with an air-stripping device to push a very large amount of mixed liquor to flow in the right direction. Such a stripping apparatus is similar to a reflux pump, which is common in conventional activated sludge processes, but saves energy and costs far more than pumps in the conventional sense.
In the water inlet, part of circulating mixed liquid distributed by a water distribution facility meets inlet water and passes through a long and narrow water inlet premixing area together, in the process, return sludge and the inlet water are fully mixed, meanwhile, in a short retention time (HRT is more than 15min and less than 30min), microorganisms absorb a large amount of pollutants such as COD (chemical oxygen demand) and the like in the inlet water, but the pollutants are not completely hydrolyzed, so that a tighter sludge floc is formed, the sludge concentration in a biochemical pond is easier to control to a higher level (such as 8000 mg/L-12000 mg/L), the sludge activity is higher, the sludge load can be improved by 20%, the effluent quality is cleaner, and the effluent can reach the ground surface class II under ideal conditions.
It is noted that, in order to achieve a better effect of culturing activated sludge and avoid the sludge bulking phenomenon, the concentration of dissolved oxygen needs to be strictly controlled while ensuring that the sludge is not precipitated and anaerobic fermentation does not occur in the water inlet premixing area. However, the circulating mixed liquor pushed by the stripping apparatus already carries some dissolved oxygen into the feedwater premixing zone.
In order to solve the problem, firstly, a small amount of micropore aeration devices are arranged in the water inlet premixing area, dissolved oxygen is accurately controlled, and the concentration of low dissolved oxygen in the area is controlled while mud deposition is avoided; secondly, the design of the water distribution facility is very important, so that a small part (not more than 50%) of the mixed liquid pushed by the gas stripping device flows into the water inlet premixing area, and simultaneously, the oxygen carried by the mixed liquid is ensured to be only in a small proportion (such as 10%) of the oxygen provided by the microporous aeration facility in the water inlet premixing area.
Another benefit of the design of the influent premixing area is that the sludge sedimentation performance cultured by the influent premixing area is better (SVI < 60), the sludge activity in the whole biochemical pond is higher, and M L VSS/M L SS keeps a higher level, so that the activated sludge is not easy to run off, and therefore, even if the sludge concentration of the process is higher than that of the traditional process, the risk of sludge running of the effluent of the clarification area is higher, and the risk can be avoided by the design.
Meanwhile, the clarification zone can play a role in screening and culturing microorganisms at the beginning of the operation of the biochemical tank, broken and scattered microbial flocs flow out along with water, the screened sludge remained in the biochemical tank has relatively good properties, and activated sludge with longer sludge age and better floc structure can be cultured after repeated circulation and repetition. After the biochemical tank operates stably, the stability of the activated sludge can be optimized in the clarification area, so that the effluent quality is cleaner.
Utilize the utility model discloses a when biochemical treatment pond handles sewage, the sewage raw water mixes with the backward flow mixed liquid in the mixed department of intaking, mixes district control oxygen deficiency environment in advance intaking to cultivate the better activated sludge of property, further degrading the pollutant after getting into main aeration district, when reaching aeration district tail end, pollutant concentration has reduced to being close to 0 (especially NH)3N), the gas stripping device pushes flow to generate large circulation, most of the flow enters a return channel at the bottom of the clarification zone, and the other part of the flow returns to the water inlet premixing zone to complete a large circulation, so that the activated sludge is optimized and stabilized.
As mentioned above, under the known activated sludge treatment principle, when the proper total pollutant load is selected according to the actual performance of the activated sludge, the treatment of the utility model can achieve better effect, such as the II-class standard of surface water; meanwhile, as the selection and the culture of the activated sludge are further enhanced, the capability of the sludge for absorbing the phosphorus-containing pollutants is improved, the proportion of removing the phosphorus-containing pollutants through biochemical sludge discharge is increased, and the required chemical phosphorus removal agents can be reduced.
In conclusion, the utility model discloses a biochemical treatment pond to the excellent application of air stripping device, adopt into water and mix district and return passage in advance and carry out the major cycle, and the design in clarification district, has improved the reactor flow state, has strengthened the performance in each aspect of activated sludge, can degrade difficult biochemical organic matter more, is close to 100% denitrogenation simultaneously.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it.
FIG. 1 is a plan view of the enhanced activated sludge process biochemical sewage treatment tank of the present invention.
[ main component symbol description ]
1. A water inlet; 2. a water inlet premixing area; 3. a primary aeration zone; 4. a gas stripping device; 5. a water distribution facility; 6. A clarification zone; 7. a return channel; 8. a water outlet channel; 9. a tank body.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. The examples given are only for explaining the invention and are not intended to limit the scope of the invention.
As shown in FIG. 1, the utility model provides a strengthen activated sludge process sewage biochemical treatment pond, this cell body 9 of strengthening activated sludge process sewage biochemical treatment pond includes: the system comprises a water inlet premixing area 2, a main aeration area 3, at least one air stripping device 4, a water distribution facility 5, a clarification area 6 and a return channel 7, wherein:
the front end of the water inlet premixing area 2 is provided with a raw water inlet 1 which is a mixing point of inlet water and a circulating reflux mud-water mixture, the tail end of the water inlet premixing area 2 is communicated with the front end of the main aeration area 3, and the bottom of the water inlet premixing area 2 is provided with a micropore aeration system; the influent premixing zone 2 is used for mixing raw water and a circulating return sludge-water mixture, and simultaneously controlling the low dissolved oxygen condition to culture more compact sludge flocs, and then flows into the main aeration zone 3.
The air lifting device 4 is arranged at the tail end of the main aeration zone 3, the water distribution facility 5 is arranged behind the air lifting device 4, the water distribution facility 5 is respectively communicated with the front end of the water inlet premixing zone 2 and the front end of the backflow channel 7, and the tail end of the backflow channel 7 is communicated with the front end of the main aeration zone 3;
the clarification area 6 is arranged above or beside the backflow channel 7 and is communicated with the backflow channel 7, and the clarification area 6 is provided with a water outlet channel 8 for discharging clarified and separated water; the clarification zone 6 can realize the screening and interception of sludge, and simultaneously clarify and separate the treated sewage which is discharged into a water collecting system through a water outlet channel 8.
After the sludge-water mixture in the main aeration area 3 is pushed to flow by the air-lifting device 4 and is distributed by the water distribution facility 5, a small part (not more than 50%) of the sludge-water mixture is mixed with raw water flowing in from the water inlet 1, then the mixture enters the water inlet premixing area 2, finally the mixture flows into the main aeration area 3 through the water inlet premixing area 2, and most of the rest enters the return channel 7, is screened and intercepted by sludge in the clarification area 6, and then enters the main aeration area 3 through the return channel 7.
Furthermore, the bottom of the inlet water premixing area 2 is provided with a micropore aeration system adopting an intermittent aeration mode, and the main aeration area 3 is also provided with a micropore aeration system adopting an intermittent aeration mode, so that the dissolved oxygen concentration is kept to be lower than 0.3 mg/L.
Preferably, the micro-pore aeration system of the water inlet premixing area 2 and the micro-pore aeration system of the main aeration area 3 respectively comprise a micro-pore aeration device and an automatic control device so as to realize the accurate dissolved oxygen control of the biochemical tank.
Further, the return passage 7 is provided with a sludge purge device.
Furthermore, a sludge hopper is arranged at the bottom of the tank at the tail end of the return channel 7, so that the excess sludge in the biochemical treatment tank is concentrated and then discharged.
The utility model discloses keep limited dissolved oxygen condition throughout in main aeration zone 3, adopt air stripping device 4 plug flow to realize the circulation of pond internal mixing liquid, set up into water and cultivate inseparable mud floc in thoughtlessly district 2 in advance: the bottom of the water inlet premixing area 2 is provided with a microporous aeration system, a water inlet 1 is arranged at the front end of the water inlet premixing area 2, raw water and a circulating and refluxing mud-water mixture are mixed at the front end, meanwhile, the low dissolved oxygen condition is controlled, more compact sludge floc is cultured, and then the sludge floc flows into a main aeration area 3; a clarification area 6 is arranged above or beside the return channel 7, and the clarification area 6 can realize sludge screening and interception, and simultaneously clarify and separate the treated sewage to be discharged into a water outlet channel 8. After the mud-water mixture in the main aeration area 3 is pushed to flow by the air-lifting device 4 at the tail end, the water distributed by the water distribution facility 5 respectively flows into the water inlet premixing area 2 and the return channel 7 at the bottom of the clarification area 6 and then returns to the main aeration area 3; after the circulating mixed liquid is pushed to flow by the air stripping device 4, no more than 50 percent of the circulating mixed liquid passes through the water inlet premixing area 2 and then returns to the main aeration area 3.
The utility model completes the large circulation of the whole pool through the design of the air lifting device 4; a water inlet premixing area 2 is arranged, part of circulating mixed liquor distributed by a water distribution facility 5 meets inlet water at a water inlet 1 at the front end of the water inlet premixing area 2, and then passes through the long and narrow water inlet premixing area 2 together, in the process, return sludge and the inlet water are fully mixed, and meanwhile, in a short retention time (HRT is more than 15min and less than 30min), microorganisms absorb a large amount of pollutants such as COD (chemical oxygen demand) in the inlet water, but are not completely hydrolyzed, so that a more compact sludge floc is formed, and the microorganisms have better settling property; meanwhile, the clarification zone 6 is matched with and optimizes the activated sludge, so that the effluent is cleaner.
Specific embodiment example 1:
this example provides a reinforced biochemical activated sludge sewage treatment tank, which has a specific tank size of 15m × 8m × 5m (× m in length and width)× high), effective water depth of 4.6m, total volume of 550m3The amount of treated water was 1000m3Wherein the size of the main aeration zone is 15m × 4.4.4 m × 5m (length × 0 width × 1 height), the size of the clarification zone is 12m × 3.6.6 m × 4m (length × width × height), a sludge stabilizing zone (return channel) is arranged below the clarification zone, the air stripping device is positioned at one side of the clarification zone, and the size of the air stripping zone is 3.2m × 1m × 5m (length × width × height);
the sewage treatment method comprises the following steps of (1) carrying out pretreatment on sewage (a grating and a sand settling tank) to remove larger suspended matters and sand particles, then feeding the sewage into the biochemical treatment tank of the embodiment, wherein the inlet water quality requires TCOD: TN >4, (2) carrying out synchronous degradation of COD, ammonia nitrogen and nitrate nitrogen in the biochemical treatment tank with the activated sludge concentration of 8000 mg/L within 12 hours of the retention time of the sewage, and finally carrying out synchronous nitrification-denitrification with the COD <20 mg/L < 1.0 mg/L when the outlet water of the clarification zone meets the requirements of the III-class water body of surface water, and (3) carrying out mixed raw water and the sewage after circulation at the inlet water, culturing tighter sludge flocs, feeding the sludge flocs into a main aeration zone, keeping low dissolved oxygen (DO <0.2 mg/L) in the main aeration zone, maintaining the synchronous nitrification-denitrification state, feeding the sewage into an air stripping zone after finishing the biological degradation of most of COD and TN with the circulation of the circulation water flowing to the tail end of the main aeration zone, feeding a majority of mixed liquid into a backflow channel under the pushing flow of the air stripping device, wherein a part of the mixed liquid flows through the main aeration zone, and then passes through a small mixed liquid and returns to the whole mixed liquid to the whole aeration zone.
Specific embodiment example 2:
the embodiment provides a reinforced activated sludge process biochemical sewage treatment tank, and the specific tank size is 57.5m × 22.4.4 m × 6.5.5 m (length × width × height), the effective water depth is 6.0m, and the total volume is 7700 m3Wherein the size of the main aeration zone is 57.5m × 12.8.8 m × 6m (length × 0 width × 1 height), the size of the clarification zone is 52.5m × 9.6.6 m × 5.0.0 m (length × width × height), a sludge stabilizing zone (return channel) is arranged below the clarification zone, the air stripping device is positioned at one side of the clarification zone, and the size of the air stripping zone is 11.6m × 1m × 6m (length × width × height);
the sewage treatment mode is as follows: (1) the itemThe target project is a standard improvement project, and the water inflow is 20000m3Part of the effluent is the first-stage A effluent of the upstream oxidation ditch, part of the effluent is pretreated raw water, and a carbon source (sodium acetate or ethanol and the like) adding device is prepared to ensure that the TCOD is TN>4, (2) the COD of the inlet water is less than 175 mg/L and less than 37 mg/L, and the outlet water meets the requirements of surface water III class water, namely COD<20 mg/L is less than 1.0 mg/L, (3) oxygen supply 176kgO is provided for the main aeration area2The water concentration fluctuates, the low dissolved oxygen state is kept, and the surface load of the clarification zone is less than 1.5m3/m2H, maintaining better clarification effect along with fluctuation of the water inlet amount and yielding water SS<10mg/L。
Further, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
It should also be noted that the above description is a preferred embodiment of the present invention, and it should be noted that, for a person skilled in the art, several improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A reinforced activated sludge process sewage biochemical treatment tank is characterized by comprising: the system comprises a water inlet premixing area, a main aeration area, at least one air lifting device, a water distribution facility, a clarification area and a backflow channel, wherein:
the front end of the water inlet premixing area is provided with a raw water inlet, the tail end of the water inlet premixing area is communicated with the front end of the main aeration area, and the bottom of the water inlet premixing area is provided with a micropore aeration system;
the air lifting device is arranged at the tail end of the main aeration area, the water distribution facility is arranged behind the air lifting device, the water distribution facility is respectively communicated with the front end of the water inlet premixing area and the front end of the backflow channel, and the tail end of the backflow channel is communicated with the front end of the main aeration area;
the clarifying area is arranged above or beside the backflow channel and is communicated with the backflow channel, and the clarifying area is provided with a water outlet channel for discharging clarified and separated water;
after the sludge-water mixture in the main aeration area is pushed by the air lifting device and is distributed by the water distribution facility, a small part of the sludge-water mixture is mixed with raw water flowing in from the water inlet, enters the water inlet premixing area, finally flows into the main aeration area through the water inlet premixing area, and the rest of the sludge enters the return channel, is screened and intercepted by sludge in the clarification area, and then enters the main aeration area through the return channel.
2. A biochemical treatment tank for sewage by enhanced activated sludge process as claimed in claim 1, wherein the bottom of the influent premixing zone is provided with a micro-aeration system using an intermittent aeration method, and the main aeration zone is also provided with a micro-aeration system using an intermittent aeration method.
3. The enhanced activated sludge process biochemical treatment tank as claimed in claim 2, wherein the micro-pore aeration system of the influent premixing zone and the micro-pore aeration system of the main aeration zone respectively comprise a micro-pore aeration device and an automatic control device.
4. An enhanced activated sludge process wastewater biochemical treatment tank as claimed in claim 1, wherein said return channel is provided with a sludge purging device.
5. The biochemical sewage treatment tank with the enhanced activated sludge process as claimed in claim 4, wherein a sludge hopper is arranged at the bottom of the tank at the tail end of the return channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921288224.1U CN210974309U (en) | 2019-08-09 | 2019-08-09 | Strengthen biochemical treatment pond of activated sludge process sewage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921288224.1U CN210974309U (en) | 2019-08-09 | 2019-08-09 | Strengthen biochemical treatment pond of activated sludge process sewage |
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| Publication Number | Publication Date |
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| CN210974309U true CN210974309U (en) | 2020-07-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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