CN104891656A - Integrated sewage treatment tank for improving AAO (Anaerobic-Anoxic-Oxic) process and sewage treatment method - Google Patents
Integrated sewage treatment tank for improving AAO (Anaerobic-Anoxic-Oxic) process and sewage treatment method Download PDFInfo
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Abstract
The invention discloses an integrated sewage treatment tank for improving an AAO (Anaerobic-Anoxic-Oxic) process and a sewage treatment method. The treatment tank comprises an anaerobic phosphorus removal zone, a low-oxygen aeration zone, a strengthened aeration zone and a precipitation zone, which are adjacent to one another in sequence, are arranged integrally and are separated from one another by virtue of separating walls, wherein the anaerobic phosphorus removal zone is divided into a first anaerobic phosphorus removal zone and a second anaerobic phosphorus removal zone by virtue of a first separating wall; the low-oxygen aeration zone is divided into a first low-oxygen aeration zone and a second low-oxygen aeration zone by virtue of a second separating wall; and a sludge return passage is arranged between the precipitation zone and the first anaerobic phosphorus removal zone. The sewage treatment tank and the sewage treatment method disclosed by the invention have the advantages of good nitrogen and phosphorus removal effect, good stability and high treatment efficiency.
Description
Technical field
The present invention relates to waste disposal plant, particularly relate to a kind of integration improvement AAO treatment tank and sewage water treatment method.
Background technology
Along with the development of society, the problem of water scarcity is day by day serious, and water will become an important factor of restriction social development.People also more and more pay attention to exploitation and the improvement of water technology.
Biologic process for treating sewage is one commonplace in sewage treatment process, is also called activated sludge process.Activated sludge process can be divided into aerobic method and anaerobic process etc.In aerobe Sewage treatment systems, microorganism utilizes the dissolved oxygen in water, and then the organic pollutant in oxidative degradation water carries out the lock out operation of microorganism and water, reaches the object of purifying waste water.
AAO Process is also known as A
2o method, being the abbreviation (anaerobic-anoxic-oxic method) of English Anaerobic-Anoxic-Oxic first letter, is a kind of conventional sewage treatment process, can be used for B-grade sewage process or three grades of sewage disposals, and Treated sewage reusing.
Anaerobic reactor, raw waste water and the phosphorous returned sluge of discharging from settling tank synchronously enter, and this reactor major function is release phosphorus, and partial organic substances carries out ammonification simultaneously;
Anoxic reacter, premiere feature is denitrogenation, and nitric nitrogen is sent here by aerobic reactor by internal recycle, and the mixing liquid measure of circulation is comparatively large, is generally 2Q (Q is raw waste water flow);
Aerobic reactor---aeration tank, this reaction member is multi-functional, removes COD, and nitrated and absorption phosphorus etc. carries out all herein.Flow is that the mixed solution of 2Q is from being back to anoxic reacter here.
Settling tank, function is mud-water separation, and a mud part is back to anaerobic reactor, and supernatant liquor is as the discharge of process water.
The feature of AAO method denitrification process:
1. under anaerobism (anoxic), aerobic alternate run condition, thread fungus can not breed in a large number, and not easily mud filamentous bulking occurs, SVI value is generally less than 100;
2. do not need dispensing in running, two A sections are only with stirring gently, and not increase dissolved oxygen for degree, working cost is low;
3. not needing additional carbon and rear aeration tank, take raw waste water as carbon source, build and working cost lower;
Tradition AAO method Problems existing:
1.AAO technique is difficult to the effect of the denitrogenation dephosphorizing simultaneously obtained;
2. sludge circulation is than little, poor stability;
3. will by sewage disposal to conformance with standard, the residence time of sewage is long, and processing efficiency is low.
Summary of the invention
It is little that first object of the present invention is to provide a kind of floor space, can reduce the integrated sewage disposal pond for improveing AAO of cost of sewage disposal.
Another object of the present invention is to provide and adopts the above-mentioned integrated sewage disposal pond sewage water treatment method for improveing AO, has good denitrogenation and dephosphorization effect, good stability, advantage that processing efficiency is high.
Integrated sewage disposal pond for improveing AAO of the present invention, this treatment tank is comprised adjacent successively and is wholely set and the anaerobism dephosphorization district separated by partition wall, low-oxygen aeration district, enhanced aeration district and settling region, and each partition wall is respectively arranged with water stream channel; Described anaerobism dephosphorization district is divided into the first anaerobism dephosphorization district and the second anaerobism dephosphorization district by the first partition wall, and described first partition wall two ends are respectively arranged with water stream channel, and influent waste water end in the first anaerobism dephosphorization district and the second anaerobism dephosphorization district all arrange plug-flow whipping appts away from one end of influent waste water end; Described low-oxygen aeration district is divided into the first low-oxygen aeration district and the second low-oxygen aeration district by the second partition wall, and described second partition wall two ends are respectively arranged with water stream channel, and described first low-oxygen aeration district is provided with air plug-flow district at feed-water end; By sludge reflux channel connection between described settling region and anaerobism dephosphorization district.
Optionally, be provided with online dissolved oxygen meter in described low-oxygen aeration district, described online dissolved oxygen meter is connected with Controlling System, to carry out on-line monitoring and control to the dissolved oxygen in low-oxygen aeration district.
Optionally, suction mud scraper is set in described settling region, inhales mud scraper sludge outlet and communicate with sludge reflux passage, to scrape the mud at the bottom of pond, settling region and to be delivered in sludge reflux passage, thus realize backflow; Also effluent trough is provided with, to carry out outer row after supernatant liquor above collecting precipitation district above described settling region.
Optionally, the aerating apparatus with self-cleaning function is provided with in described low-oxygen aeration district and enhanced aeration district.
Optionally, in described air plug-flow district, be provided with air impeller, to play plug-flow effect to the sludge water mixture in low-oxygen aeration district, realize the circulation of mud in the first low-oxygen aeration district and the second low-oxygen aeration district.
Present invention also offers a kind of sewage water treatment method of the integrated sewage disposal pond for described improvement AAO, comprise the following steps:
S10, waste water is transported in the first anaerobism dephosphorization district mixes with the mixed solution be circulated in the first anaerobism dephosphorization district from the second anaerobism dephosphorization district, under the environment of absolute anaerobism, then carry out denitrification and anaerobic phosphorus release reaction in the first anaerobism dephosphorization district and the second anaerobism dephosphorization district;
S20, by second anaerobism dephosphorization district process after most of mixed solution be circulated to first anaerobism dephosphorization district's water inlet place with intake continue to mix, small portion mixed solution enters into the first low-oxygen aeration district and the second low-oxygen aeration district successively, under dissolved oxygen DO<0.5mg/L condition, utilize microorganism to COD (chemical oxygen demand (COD), down together), ammonia nitrogen, TN (total nitrogen, lower same) and TP (total phosphorus, lower same) carry out absorbing and degrading, carry out nitration reaction and anti-nitration reaction simultaneously; Control dissolved oxygen DO<0.5mg/L can carry out nitrification and denitrification effect simultaneously, thus effectively remove the organism of part difficult degradation, improve organic removal efficiency, simplify the operational scheme of system denitrogenation, save energy consumption, improve nitric efficiency;
Most of mixed solution after S30, the process of the second low-oxygen aeration district is mixed by the mixed solution of coming in the second anaerobism dephosphorization district after air plug-flow district plug-flow, small portion mixed solution enters into enhanced aeration district, at dissolved oxygen concentration 2 ~ 4mg/L, strengthen the removal to COD, ammonia nitrogen, TN (total nitrogen) and TP (total phosphorus); Enhanced aeration district Dissolved Oxygen concentration Control is at 2 ~ 4mg/L, and high dissolved oxygen controls to improve the absorption of microorganism to phosphorus, improves the removal efficiency of phosphorus;
Mixed solution in S40, step S30 after process enters by mud-water separation in settling region, sludge reflux to the first anaerobism dephosphorization district after separation, and supernatant liquor is outer row above settling region.
In described step S10, absolute anaerobism refers to below dissolved oxygen concentration 0.1mg/L.
Optionally, the amount of the mixed solution in the first anaerobism dephosphorization district and the volume ratio > 20 of the first anaerobism dephosphorization district influent waste water amount is circulated in described step S10 from the second anaerobism dephosphorization district.
Optionally, in described step S20, the volume ratio > 20 mixing liquid measure that the amount being back to the mixed solution the first low-oxygen aeration district from the second low-oxygen aeration district is come in the first anaerobism dephosphorization district, to carry out the circulation dilution of large ratio, treatment tank feed-water end is significantly reduced to the organic concentration gradient of water side, on the one hand, the impact load of mud can be reduced, improve the stability of system; On the other hand, metastable growing environment is created to microorganism.
Optionally, in described first anaerobism dephosphorization district, the second anaerobism dephosphorization district, the first low-oxygen aeration district, the second low-oxygen aeration district and enhanced aeration district, sludge concentration is 4 ~ 8g/L, high sludge concentration makes antimicrobial absorbent, degradation capability strengthen, sludge loading is relatively low, volumetric loading is relatively high, construction investment can be saved, the system impact resistance simultaneously added.
Integrated sewage disposal pond for improveing AAO of the present invention, due to settling region, anaerobism dephosphorization district, low-oxygen aeration district, enhanced aeration district are wholely set, therefore, anaerobic treatment, hypoxemia process, aerobic treatment, sludge reflux, function that mud-water separation is different is achieved in same treatment tank, eliminate second pond and sludge reflux pump house, floor space is reduced greatly, also reduces construction cost simultaneously, thus reduce cost of sewage disposal.
The sewage water treatment method in the integrated sewage disposal pond for improveing AAO that employing of the present invention is above-mentioned, owing to adopting described integrated sewage disposal pond, therefore cost of sewage disposal is low, in addition, because low-oxygen aeration district (A) carries out Air Exposure under the condition of DO<0.8mg/L, nitrification and denitrification effect can be carried out simultaneously, thus effectively remove the organism of part difficult degradation, improve organic removal efficiency, simplify the operational scheme of system denitrogenation, save energy consumption, improve nitric efficiency, it also avoid the disadvantageous effect because NO3-N accumulation brings simultaneously, decrease the mechanical means between each reactor, both the good denitrification effect realized, again reduce air blast energy consumption, achieve double effects that is energy-saving and cost-reducing and good treatment effect, and the state modulator of large ratio circulation and high sludge concentration, improve the stability of system, enhanced aeration district (O), under the condition of DO=2 ~ 4mg/L, effectively can improve the absorption of microorganism to phosphorus, improve the removal efficiency to total phosphorus, the integrated design of anaerobism dephosphorization district (A), low-oxygen aeration district (A), enhanced aeration district (O), settling region, saves floor space, reduces construction investment, simplify treatment scheme simultaneously, reduce operation power consumption.
Accompanying drawing explanation
Fig. 1 is that the present invention is for improveing the structural representation in the integrated sewage disposal pond of AAO.
In figure, mark is illustrated as: 1-enhanced aeration district; 2-settling region; 3-first partition wall; 401-first anaerobism dephosphorization district; 402-second anaerobism dephosphorization district; 5-plug-flow whipping appts; 6-second partition wall; 701-first low-oxygen aeration district; 702-second low-oxygen aeration district; 8-air plug-flow district; 9-sludge reflux passage; The online dissolved oxygen meter of 10-.
Embodiment
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is further elaborated.
Embodiment 1
See Fig. 1, present embodiments provide a kind of integrated sewage disposal pond for improveing AAO, comprise adjacent successively and be wholely set and the anaerobism dephosphorization district separated by partition wall, low-oxygen aeration district, enhanced aeration district 1 and settling region 2, each partition wall is respectively arranged with water stream channel, described anaerobism dephosphorization district is divided into the first anaerobism dephosphorization district 401 and the second anaerobism dephosphorization district 402 by the first partition wall 3, and described first partition wall 3 two ends are respectively arranged with water stream channel, so that the mixed solution in the first anaerobism dephosphorization district 401 can enter into the second anaerobism dephosphorization district 402, then be recycled to the first anaerobism dephosphorization district 401 from second anaerobism dephosphorization district 402 the other end after process in the second anaerobism dephosphorization district 402, and the influent waste water end in the first anaerobism dephosphorization district 401 and the second anaerobism dephosphorization district 402 all arrange plug-flow whipping appts 5 away from one end of influent waste water end, described low-oxygen aeration district is divided into the first low-oxygen aeration district 701 and the second low-oxygen aeration district 702 by the second partition wall 6, described second partition wall 6 two ends are respectively arranged with water stream channel, so that the mixed solution after process in the first low-oxygen aeration district 701 can enter into the second low-oxygen aeration district 702, be then recycled to the first low-oxygen aeration district 701 from the other end in the second low-oxygen aeration district 702 after process in the second low-oxygen aeration district 702, described first low-oxygen aeration district 701 is provided with air plug-flow district 8 at feed-water end, be communicated with by sludge reflux passage 9 between described settling region 2 with anaerobism dephosphorization district, and preferably settling region 2 be communicated in the first anaerobism dephosphorization district 401 in anaerobism dephosphorization district by sludge reflux passage 9.
Integrated sewage disposal pond for improveing AAO of the present invention, due to settling region 2, anaerobism dephosphorization district, low-oxygen aeration district, enhanced aeration district 1 are wholely set, therefore, anaerobic treatment, hypoxemia process, aerobic treatment, sludge reflux, function that mud-water separation is different is achieved in same treatment tank, eliminate second pond and sludge reflux pump house, floor space is reduced greatly, also reduces construction cost simultaneously, thus reduce cost of sewage disposal.
In the present embodiment, optionally, be provided with online dissolved oxygen meter 10 in described low-oxygen aeration district, described online dissolved oxygen meter 10 is connected with Controlling System (not shown), to carry out on-line monitoring and control to the dissolved oxygen in low-oxygen aeration district.Described online dissolved oxygen meter 10 is preferably provided with the water side in the second low-oxygen aeration district 702, to be better controlled the oxyty in low-oxygen aeration district.
In the present embodiment, optionally, arrange in described settling region 2 and inhale mud scraper (not shown), inhale mud scraper sludge outlet and communicate with sludge reflux passage 9, to scrape the mud at the bottom of pond, settling region 2 and to be delivered in sludge reflux passage 9, thus realize backflow; Effluent trough (not shown) is also provided with, to carry out outer row after supernatant liquor above collecting precipitation district 2 above described settling region 2.
In the present embodiment, optionally, in described low-oxygen aeration district and enhanced aeration district 1, be provided with the aerating apparatus (not shown) with self-cleaning function, to carry out aeration to low-oxygen aeration district and enhanced aeration district 1.
In the present embodiment, optionally, be provided with air impeller (not shown) in described air plug-flow district 8, to play plug-flow effect to the sludge water mixture in low-oxygen aeration district, realize the circulation of mud in the first low-oxygen aeration district 701 and the second low-oxygen aeration district 702.
In the present embodiment, described in there is the aerating apparatus of self-cleaning function, plug-flow whipping appts, inhale mud scraper, air impeller is common equipment of the prior art, repeats no more its structure at this.
Embodiment 2
See Fig. 1, present invention also offers a kind of sewage water treatment method of the integrated sewage disposal pond for described improvement AAO, comprise the following steps:
S10, waste water is transported in the first anaerobism dephosphorization district 401 and mixes with the mixed solution be circulated in the first anaerobism dephosphorization district 401 from the second anaerobism dephosphorization district 402, under the environment of absolute anaerobism, then carry out denitrification in the first anaerobism dephosphorization district 401 and the second anaerobism dephosphorization district 402 and anaerobic phosphorus release reacts;
S20, most of mixed solution after the second anaerobism dephosphorization district 402 processes is circulated to the first anaerobism dephosphorization district 404 water inlet place to continue to mix with water inlet, small portion mixed solution enters into the first low-oxygen aeration district 701 and the second low-oxygen aeration district 702 successively, under DO<0.5mg/L condition, utilize microorganism to COD, ammonia nitrogen, TN and TP carries out absorbing and degrading, carry out nitration reaction and anti-nitration reaction simultaneously, first low-oxygen aeration district 701 and the second low-oxygen aeration district 702 Dissolved Oxygen concentration Control are at DO<0.5mg/L, dissolved oxygen controls to carry out nitrification and denitrification effect at below DO<0.5mg/L simultaneously, thus effectively remove the organism of part difficult degradation, improve organic removal efficiency, simplify the operational scheme of system denitrogenation, save energy consumption, improve nitric efficiency,
Most of mixed solution after S30, the second low-oxygen aeration district 702 process is mixed by the mixed solution of coming in the second anaerobism dephosphorization district 402 after air plug-flow district 8 plug-flow, small portion mixed solution enters into enhanced aeration district 1, at dissolved oxygen concentration 2 ~ 4mg/L, strengthen the removal to COD, ammonia nitrogen, TN and TP; Enhanced aeration district Dissolved Oxygen concentration Control is at 2 ~ 4mg/L, and high dissolved oxygen controls to improve the absorption of microorganism to phosphorus, improves the removal efficiency of phosphorus.
Mixed solution in S40, step S30 after process enters by mud-water separation in settling region 2, sludge reflux to the first anaerobism dephosphorization district 401 after separation, and supernatant liquor is outer row above settling region.
In the present embodiment, optionally, the amount of the mixed solution in the first anaerobism dephosphorization district 401 and the volume ratio > 20 of the first anaerobism dephosphorization district 401 influent waste water amount is circulated in described step S10 from the second anaerobism dephosphorization district 402.
In the present embodiment, optionally, in described step S20, the volume ratio > 20 mixing liquid measure that the amount being back to the mixed solution the first low-oxygen aeration district 701 from the second low-oxygen aeration district 702 is come in the first anaerobism dephosphorization district 401, to carry out the circulation dilution of large ratio, treatment tank feed-water end is significantly reduced, on the one hand to the organic concentration gradient of water side, the impact load of mud can be reduced, improve the stability of system; On the other hand, metastable growing environment is created to microorganism.
In the present embodiment, optionally, in described first low-oxygen aeration district 702 of low-oxygen aeration district 701, second of anaerobism dephosphorization district 402, first of anaerobism dephosphorization district 401, second and enhanced aeration district 1, sludge concentration is 4 ~ 8g/L, high sludge concentration makes antimicrobial absorbent, degradation capability strengthen, sludge loading is relatively low, volumetric loading is relatively high, can save construction investment, the system impact resistance simultaneously added.
Empirical tests, can be found out by table 1, and the sewage water treatment method dephosphorization efficiency by using of the present embodiment reaches 65% ~ 85%, simultaneously with traditional AAO technics comparing, draining COD index can reduce by 20% ~ 40%, saves power consumption about 25% ~ 40%, and nitric efficiency improves 20% ~ 40%.
Table 1 improves AAO technique and traditional AAO process ration table
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. for improveing an integrated sewage disposal pond of AAO, it is characterized in that, comprising adjacent successively and being wholely set and the anaerobism dephosphorization district separated by partition wall, low-oxygen aeration district, enhanced aeration district and settling region; Each partition wall is respectively arranged with water stream channel; Described anaerobism dephosphorization district is divided into the first anaerobism dephosphorization district and the second anaerobism dephosphorization district by the first partition wall, and described first partition wall two ends are respectively arranged with water stream channel, and influent waste water end in the first anaerobism dephosphorization district and the second anaerobism dephosphorization district all arrange plug-flow whipping appts away from one end of influent waste water end; Described low-oxygen aeration district is divided into the first low-oxygen aeration district and the second low-oxygen aeration district by the second partition wall, and described second partition wall two ends are respectively arranged with water stream channel, and described first low-oxygen aeration district is provided with air plug-flow district at feed-water end; By sludge reflux channel connection between described settling region and anaerobism dephosphorization district.
2. the integrated sewage disposal pond for improveing AAO according to claim 1, is characterized in that, is provided with online dissolved oxygen meter in described low-oxygen aeration district, and described online dissolved oxygen meter is connected with Controlling System.
3. the integrated sewage disposal pond for improveing AAO according to claim 1, is characterized in that, arrange suction mud scraper in described settling region, inhales mud scraper sludge outlet and communicates with sludge reflux passage, be also provided with effluent trough above described settling region.
4. the integrated sewage disposal pond for improveing AAO according to claim 1, is characterized in that, is provided with the aerating apparatus with self-cleaning function in described low-oxygen aeration district and enhanced aeration district.
5. the integrated sewage disposal pond for improveing AAO according to claim 1, is characterized in that, is provided with air impeller in described air plug-flow district.
6. adopting the sewage water treatment method in the integrated sewage disposal pond for improveing AAO described in any one of claim 1-5, it is characterized in that, comprise the following steps:
S10, waste water is transported in the first anaerobism dephosphorization district mixes with the mixed solution be circulated in the first anaerobism dephosphorization district from the second anaerobism dephosphorization district, under the environment of absolute anaerobism, then carry out denitrification and anaerobic phosphorus release reaction in the first anaerobism dephosphorization district and the second anaerobism dephosphorization district;
S20, by second anaerobism dephosphorization district process after most of mixed solution be circulated to first anaerobism dephosphorization district's water inlet place with intake continue to mix, small portion mixed solution enters into the first low-oxygen aeration district and the second low-oxygen aeration district successively, under dissolved oxygen DO<0.5mg/L condition, utilize microorganism absorb COD, ammonia nitrogen, TN and TP and degrade, carry out nitration reaction and anti-nitration reaction simultaneously;
Most of mixed solution after S30, the process of the second low-oxygen aeration district is mixed by the mixed solution of coming in the second anaerobism dephosphorization district after air plug-flow district plug-flow, small portion mixed solution enters into enhanced aeration district, at dissolved oxygen concentration 2 ~ 4mg/L, strengthen the removal to COD, ammonia nitrogen, TN and TP;
Mixed solution in S40, step S30 after process enters by mud-water separation in settling region, sludge reflux to the first anaerobism dephosphorization district after separation, and supernatant liquor is outer row above settling region.
7. sewage water treatment method according to claim 6, it is characterized in that, in described step S10, be circulated to the amount of the mixed solution in the first anaerobism dephosphorization district and the volume ratio > 20 of the first anaerobism dephosphorization district influent waste water amount from the second anaerobism dephosphorization district.
8. sewage water treatment method according to claim 6, it is characterized in that, in described step S20, the volume ratio > 20 mixing liquid measure that the amount being back to the mixed solution the first low-oxygen aeration district from the second low-oxygen aeration district is come in the first anaerobism dephosphorization district.
9. sewage water treatment method according to claim 6, is characterized in that, in described first anaerobism dephosphorization district, the second anaerobism dephosphorization district, the first low-oxygen aeration district, the second low-oxygen aeration district and enhanced aeration district, sludge concentration is 4 ~ 8g/L.
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| CN106045232A (en) * | 2016-08-04 | 2016-10-26 | 迈邦（北京）环保工程有限公司 | Culture sewage treatment method and system |
| CN106830322A (en) * | 2017-03-02 | 2017-06-13 | 南京市市政设计研究院有限责任公司 | It is a kind of suitable for low CN than modified form AAO ponds that sewage/wastewater is administered |
| CN107720963A (en) * | 2017-11-27 | 2018-02-23 | 湖北加德科技股份有限公司 | Low energy consumption low-level oxidation sewage treatment process and device |
| CN110526399A (en) * | 2019-09-10 | 2019-12-03 | 浙江中裕环境科技有限公司 | A kind of sewage disposal system |
| CN110526399B (en) * | 2019-09-10 | 2024-04-30 | 浙江中裕环境科技有限公司 | Sewage treatment system |
| CN114853174A (en) * | 2022-06-09 | 2022-08-05 | 山东本源环境科技有限公司 | Energy-saving consumption-reducing carbon-removing denitrification wastewater treatment equipment and treatment process |
| CN115557607A (en) * | 2022-08-31 | 2023-01-03 | 达斯玛环境科技（北京）有限公司 | Integrated biological reaction tank system and method |
| CN115557607B (en) * | 2022-08-31 | 2024-02-23 | 达斯玛环境科技（北京）有限公司 | Integrated biological reaction tank system and method |
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