CN115448456A - Biological sewage denitrification treatment method and application thereof - Google Patents

Biological sewage denitrification treatment method and application thereof Download PDF

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CN115448456A
CN115448456A CN202211027296.7A CN202211027296A CN115448456A CN 115448456 A CN115448456 A CN 115448456A CN 202211027296 A CN202211027296 A CN 202211027296A CN 115448456 A CN115448456 A CN 115448456A
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李祥
黄勇
袁砚
林振峰
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Suzhou University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

本发明公开了一种污水生物脱氮处理方法及其应用，属于污水处理技术领域。该脱氮处理方法采用了全膜化污水生物脱氮处理装置，该装置包括缺氧膜池1、好氧膜池2、MBR膜系统3和回流系统4；所述缺氧膜池1、好氧膜池2和MBR膜系统3依次连接；所述回流系统4的两端分别连接所述缺氧膜池1和好氧膜池2；所述缺氧膜池1包括推流器6、进水管7、缺氧曝气系统8和悬浮移动填料5；所述推流器6的推流方向与所述缺氧曝气系统8的出气方向相反；所述好氧膜池2包括固定纤维填料9和位于所述固定纤维填料9正下方的好氧曝气系统13。本发明仅以生物膜为载体，分别在不同环境中富集培养不同的微生物，提高了微生物丰度，提升了氮素转化的效能。

Figure 202211027296

The invention discloses a sewage biological denitrification treatment method and an application thereof, belonging to the technical field of sewage treatment. The denitrification treatment method adopts a full-membrane sewage biological denitrification treatment device, which includes anoxic membrane pool 1, aerobic membrane pool 2, MBR membrane system 3 and reflux system 4; the anoxic membrane pool 1, good Oxygen membrane pool 2 and MBR membrane system 3 are connected successively; The two ends of described reflux system 4 are respectively connected described anoxic membrane pool 1 and aerobic membrane pool 2; Water pipe 7, anoxic aeration system 8 and suspended mobile packing 5; the push flow direction of said pusher 6 is opposite to the air outlet direction of said anoxic aeration system 8; said aerobic membrane pool 2 includes fixed fiber packing 9 and the aerobic aeration system 13 located directly below the fixed fiber packing 9. The invention only uses the biofilm as a carrier to enrich and cultivate different microorganisms in different environments, thereby increasing the abundance of microorganisms and improving the efficiency of nitrogen conversion.

Figure 202211027296

Description

一种污水生物脱氮处理方法及其应用A sewage biological denitrification treatment method and its application

本申请是针对2021年01月28日申请的一种全膜化污水生物脱氮处理装置及污水生物脱氮处理的方法的发明专利提出的分案申请，原申请的申请号为：202110227336.6。This application is a divisional application for the invention patent of a full-membrane sewage biological denitrification treatment device and a sewage biological denitrification treatment method applied on January 28, 2021. The application number of the original application is: 202110227336.6.

技术领域technical field

本发明属于污水处理技术领域，尤其涉及一种污水生物脱氮处理方法及其应用。The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage biological denitrification treatment method and application thereof.

背景技术Background technique

生物脱氮一直被认为是最为经济的污水脱氮途径。常规的生物脱氮一般以活性污泥为载体，在缺氧和好氧环境中交替运行实现硝化微生物和反硝化微生物富集。在好氧环境中，污泥中的反硝化微生物因有氧环境及有机物的缺失，其活性处于抑制状态，而污泥中硝化微生物活性恢复，利用氧气将污水中氨氮转化为亚硝酸盐或者是硝酸盐；然后当污泥和硝化液回流到厌氧或者缺氧环境时，硝化微生物因缺少溶解氧，其活性处于抑制状态，此时反硝化微生物活性恢复利用进水中的有机物将硝酸盐转化为氮气而去除。为了能够充分利用原水中携带的有机物进行反硝化，一般前置缺氧池后置好氧池，同时设置硝化液回流系统将好氧池处理后的水回流至前端缺氧池。为了保证缺氧池和好氧池有足够的微生物，并增设沉淀池，另增设污泥回流泵将沉淀后的高浓度污泥回流到缺氧端。当前以此单一污泥为载体的脱氮系统由于载体单一并且在好氧和缺氧环境不断交替运行，存在以下几方面问题：一是硝化菌为自养微生物，生长比较缓慢；而反硝化微生物为异养微生物生长较快，导致污泥产量高。将其置于单一污泥系统中交替运行，采用单一排泥周期很难实现自养微生物比重的增加，进而很难提升硝化系统活性。二是常规的以污泥为载体的生物脱氮系统，污泥常常会因曝气搅动导致微生物聚集体破碎，导致污泥沉淀池体积大且泥水分离困难。Biological denitrification has always been considered as the most economical way to denitrify wastewater. Conventional biological denitrification generally uses activated sludge as a carrier, and operates alternately in anoxic and aerobic environments to achieve the enrichment of nitrifying microorganisms and denitrifying microorganisms. In an aerobic environment, the activity of the denitrifying microorganisms in the sludge is inhibited due to the aerobic environment and the lack of organic matter, while the activity of the nitrifying microorganisms in the sludge is restored, and the ammonia nitrogen in the sewage is converted into nitrite or nitrite by using oxygen. Nitrate; then when the sludge and nitrifying liquid return to the anaerobic or anoxic environment, the activity of nitrifying microorganisms is inhibited due to the lack of dissolved oxygen. At this time, the activity of denitrifying microorganisms recovers and uses the organic matter in the influent to convert nitrate Removed for nitrogen. In order to make full use of the organic matter carried in the raw water for denitrification, generally an anoxic tank is installed in the front and an aerobic tank is installed in the rear, and a nitrifying liquid return system is installed to return the water treated in the aerobic tank to the anoxic tank in the front. In order to ensure that there are enough microorganisms in the anoxic tank and the aerobic tank, a sedimentation tank is added, and a sludge return pump is added to return the settled high-concentration sludge to the anoxic end. The current denitrification system using a single sludge as a carrier has the following problems because of a single carrier and continuous alternate operation in an aerobic and anoxic environment: First, nitrifying bacteria are autotrophic microorganisms that grow relatively slowly; while denitrifying microorganisms For heterotrophic microorganisms grow faster, resulting in high sludge production. It is difficult to increase the proportion of autotrophic microorganisms by using a single sludge discharge cycle, and it is difficult to increase the activity of the nitrification system if it is placed in a single sludge system and operated alternately. The second is the conventional biological denitrification system using sludge as a carrier. The sludge is often broken by aeration and agitation, resulting in a large volume of sludge sedimentation tank and difficult separation of sludge and water.

为了解决单一污泥系统中存在微生物丰度较低的问题，现有一些工艺设计也在好氧区和缺氧区增设填料，增加相应池体内硝化微生物和反硝化微生物的丰度，进而形成膜泥双系统或者单一膜系统。膜泥双系统的污泥需要沉淀，并仍存在污泥量高、易碎等问题，仍然无法解决自养微生物丰度低的问题；而单一膜系统则存在以下问题：1)反硝化微生物世代时间短，繁殖速度快，生物膜增长和死亡较快，导致老化生物膜难以脱落的现象；2)硝化系统微生物增长较慢，生物膜难以快速形成，或形成后难以脱落的现象。因此，必须针对不同的微生物的生长特性，采用不同特性膜载体，并辅以独特的工艺设计解决上述问题。In order to solve the problem of low microbial abundance in the single sludge system, some existing process designs also add fillers in the aerobic zone and anoxic zone to increase the abundance of nitrifying microorganisms and denitrifying microorganisms in the corresponding tanks, thereby forming membranes. mud double system or single membrane system. The sludge of the dual-membrane system needs to be settled, and there are still problems such as high sludge volume and fragility, which still cannot solve the problem of low abundance of autotrophic microorganisms; while the single-membrane system has the following problems: 1) Generation of denitrifying microorganisms The time is short, the reproduction speed is fast, and the biofilm grows and dies faster, which leads to the phenomenon that the aging biofilm is difficult to fall off; 2) The growth of microorganisms in the nitrification system is slow, and the biofilm is difficult to form quickly, or it is difficult to fall off after forming. Therefore, according to the growth characteristics of different microorganisms, membrane carriers with different characteristics must be used, supplemented by unique process design to solve the above problems.

发明内容Contents of the invention

本发明的目的之一在于提供一种污水生物脱氮处理系统，所述处理系统包括缺氧膜池1、好氧膜池2、MBR膜系统3和回流系统4的脱氮装置；One of the objects of the present invention is to provide a sewage biological denitrification treatment system, the treatment system includes an anoxic membrane tank 1, an aerobic membrane tank 2, an MBR membrane system 3 and a denitrification device of a reflux system 4;

所述缺氧膜池1、好氧膜池2和MBR膜系统3依次连接；The anoxic membrane pool 1, the aerobic membrane pool 2 and the MBR membrane system 3 are sequentially connected;

所述回流系统4的两端分别连接所述缺氧膜池1和好氧膜池2；Both ends of the reflux system 4 are respectively connected to the anoxic membrane pool 1 and the aerobic membrane pool 2;

所述缺氧膜池1包括推流器6、进水管7、缺氧曝气系统8和悬浮移动填料5；所述推流器6的推流方向与所述缺氧曝气系统8的出气方向相反；The anoxic membrane pool 1 includes a pusher 6, a water inlet pipe 7, an anoxic aeration system 8 and a suspended mobile filler 5; in the opposite direction;

所述好氧膜池2包括固定纤维填料9和位于所述固定纤维填料9正下方的好氧曝气系统13。The aerobic membrane tank 2 includes a fixed fiber packing 9 and an aerobic aeration system 13 located directly below the fixed fiber packing 9 .

优选地，所述回流的回流比为(2～14)：1。Preferably, the reflux ratio of the reflux is (2-14):1.

更优选地，所述回流的回流比为4：1。More preferably, the reflux ratio of the reflux is 4:1.

优选地，所述悬浮移动填料5在所述缺氧膜池1中的填充度为40％～60％。Preferably, the filling degree of the suspended mobile filler 5 in the anoxic membrane cell 1 is 40%-60%.

优选地，所述悬浮移动填料5为聚乙烯移动膜填料、海绵膜或聚乙烯移动膜填料和海绵膜的组合(参见图4)。Preferably, the suspended mobile packing 5 is polyethylene mobile film packing, sponge film or a combination of polyethylene mobile film packing and sponge film (see FIG. 4 ).

优选地，所述固定纤维填料9在所述好氧膜池2中的填充度为40％～60％。Preferably, the filling degree of the fixed fiber filler 9 in the aerobic membrane tank 2 is 40%-60%.

更优选地，所述缺氧膜池1和好氧膜池2共壁构建。More preferably, the anoxic membrane pool 1 and the aerobic membrane pool 2 are constructed with a common wall.

优选地，所述好氧曝气系统13和所述缺氧曝气系统8采用微孔曝气管道。Preferably, the aerobic aeration system 13 and the anoxic aeration system 8 adopt microporous aeration pipes.

优选地，所述MBR膜系统3为外置膜。Preferably, the MBR membrane system 3 is an external membrane.

优选地，所述回流系统4采用气升回流或回流泵回流。Preferably, the reflux system 4 adopts airlift reflux or reflux pump reflux.

优选地，所述MBR膜系统3包括老生物膜出口11和出水口12；所述MBR膜系统3中内置超滤膜。Preferably, the MBR membrane system 3 includes an old biofilm outlet 11 and a water outlet 12; an ultrafiltration membrane is built in the MBR membrane system 3 .

本发明的目的之二在于提供上述处理系统的运行方法及在污水生物脱氮中的应用。The second object of the present invention is to provide the operation method of the above treatment system and its application in sewage biological denitrification.

更优选地，所述处理方法包括以下步骤：More preferably, the processing method comprises the following steps:

关闭缺氧曝气系统8，开启推流器6和好氧曝气系统13，将污水由进水管7依次进入缺氧膜池1进行缺氧处理和好氧膜池2进行好氧处理，并将好氧处理后得到的硝化液一部分通过回流系统4回流至缺氧膜池1，剩余部分通过MBR膜系统3处理实现泥水分离；Close the anoxic aeration system 8, open the pusher 6 and the aerobic aeration system 13, the sewage enters the anoxic membrane pool 1 successively by the water inlet pipe 7 for anoxic treatment and the aerobic membrane pool 2 for aerobic treatment, and A part of the nitrifying liquid obtained after the aerobic treatment is returned to the anoxic membrane pool 1 through the reflux system 4, and the remaining part is treated by the MBR membrane system 3 to realize the separation of mud and water;

当所述缺氧膜池1中悬浮移动填料5上的生物膜老化后，打开缺氧曝气系统8，使老化后的生物膜脱落；When the biofilm on the suspended mobile filler 5 in the anoxic membrane pool 1 is aged, the anoxic aeration system 8 is opened to make the aged biofilm fall off;

当所述好氧膜池2中固定纤维填料9上的生物膜老化后，瞬时增大所述好氧曝气系统13 的曝气量，使老化后的生物膜脱落。When the biofilm on the fixed fiber filler 9 in the aerobic membrane tank 2 ages, the aeration rate of the aerobic aeration system 13 is increased instantaneously to make the aged biofilm fall off.

在本发明的一个实施例中，当所述缺氧膜池1中悬浮移动填料5上的生物膜老化后，打开缺氧曝气系统8，使老化后的生物膜脱落时，所述缺氧曝气系统8的进气量与所述缺氧膜池1的进水量的体积比优选为(10～20)：1，更优选为20:1；持续时间优选为1～3h，更优选为2h。在本发明的实施例中，体积比具体为20:1，持续时间具体为2h。In one embodiment of the present invention, after the biofilm on the suspended mobile filler 5 in the anoxic membrane pool 1 is aged, the anoxic aeration system 8 is opened to shed the aged biofilm, and the anoxic The volume ratio of the air intake of the aeration system 8 to the water intake of the anoxic membrane pool 1 is preferably (10-20):1, more preferably 20:1; the duration is preferably 1-3h, more preferably 2h. In the embodiment of the present invention, the volume ratio is specifically 20:1, and the duration is specifically 2 hours.

在本发明的一个实施例中，所述好氧膜池2中的溶解氧优选为0.5～4mg/L，更优选为2mg/L；在本发明的实施例中，溶解氧具体为2mg/L。在本发明中，所述好氧膜池2中进气量与进水量的体积比优选为(3～10):1，更优选为5:1。In an embodiment of the present invention, the dissolved oxygen in the aerobic membrane pool 2 is preferably 0.5-4 mg/L, more preferably 2 mg/L; in an embodiment of the present invention, the dissolved oxygen is specifically 2 mg/L . In the present invention, the volume ratio of the air intake to the water intake in the aerobic membrane pool 2 is preferably (3-10):1, more preferably 5:1.

在本发明的一个实施例中，当所述好氧膜池2中固定纤维填料9上的生物膜老化后，增大所述好氧曝气系统13的曝气量，使老化后的生物膜脱落时，增大所述好氧曝气系统13的曝气量的具体操作优选为提高所述好氧膜池2中进气量与进水量的体积比，所述体积比优选为(5～20)：1，更优选为9:1。In one embodiment of the present invention, when the biofilm on the fixed fiber filler 9 in the aerobic membrane tank 2 is aged, the aeration rate of the aerobic aeration system 13 is increased to make the aged biofilm When falling off, the specific operation of increasing the aeration rate of the aerobic aeration system 13 is preferably to increase the volume ratio of the air intake and water intake in the aerobic membrane pool 2, and the volume ratio is preferably (5～ 20):1, more preferably 9:1.

在本发明的一个实施例中，缺氧膜和好氧膜池仅依赖生物膜中微生物，无污泥回流系统，系统悬浮污泥浓度可小于100mgMLVSS/L。In one embodiment of the present invention, the anoxic membrane and the aerobic membrane pool only rely on microorganisms in the biofilm, without a sludge return system, and the suspended sludge concentration in the system can be less than 100 mgMLVSS/L.

与现有技术相比，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:

本发明提供了一种污水生物脱氮处理方法，该方法采用了全膜化污水生物脱氮处理装置，该装置包括缺氧膜池1、好氧膜池2、MBR膜系统3和回流系统4；所述缺氧膜池1、好氧膜池2和MBR膜系统3依次连接；所述回流系统4的两端分别连接所述缺氧膜池1和好氧膜池2；所述缺氧膜池1包括推流器6、进水管7、缺氧曝气系统8和悬浮移动填料5；所述推流器6的推流方向与所述缺氧曝气系统8的出气方向相反；所述好氧膜池2包括固定纤维填料9和位于所述固定纤维填料9正下方的好氧曝气系统13。本发明以生物膜为载体，分别在不同环境中富集培养不同的微生物，实现微生物丰度的提高，有利于氮素转化效能的提升。同时针对缺氧区生长较快的异养微生物，采用移动型的悬浮移动填料为载体，增加相互摩擦几率，并增设能够与推流器的推流方向产生对流的缺氧曝气系统以强化老化生物膜的脱落，保证生物膜降解污染物的活力；而针对好氧区生长比较慢的自养微生物，采用固定纤维填料为载体，有利于微生物高效富集，底部设置曝气系统，有利于气体对固定纤维填料上的老化生物膜的冲刷，保证好氧区生物膜活力，同时不依赖于悬浮污泥脱氮，降低了水中的悬浮固体浓度，减少了硝化液的回流磨损，同时也增加了MBR膜的掺水量和使用寿命。The invention provides a sewage biological denitrification treatment method, the method adopts a full-membrane sewage biological denitrification treatment device, and the device includes an anoxic membrane pool 1, an aerobic membrane pool 2, an MBR membrane system 3 and a reflux system 4 The anoxic membrane pool 1, the aerobic membrane pool 2 and the MBR membrane system 3 are connected sequentially; the two ends of the reflux system 4 are respectively connected to the anoxic membrane pool 1 and the aerobic membrane pool 2; Membrane tank 1 comprises a pusher 6, a water inlet pipe 7, an anoxic aeration system 8 and a suspended mobile packing 5; the flow direction of the pusher 6 is opposite to the gas outlet direction of the anoxic aeration system 8; the The aerobic membrane tank 2 includes a fixed fiber packing 9 and an aerobic aeration system 13 located directly below the fixed fiber packing 9 . The invention uses the biofilm as a carrier to respectively enrich and cultivate different microorganisms in different environments, so as to realize the improvement of the abundance of the microorganisms, and is beneficial to the improvement of nitrogen conversion efficiency. At the same time, for the heterotrophic microorganisms that grow faster in the anoxic area, mobile suspension mobile packing is used as the carrier to increase the probability of mutual friction, and an anoxic aeration system that can convect the flow direction of the pusher is added to strengthen aging The shedding of the biofilm ensures the vitality of the biofilm to degrade pollutants; for the autotrophic microorganisms that grow slowly in the aerobic zone, the fixed fiber filler is used as the carrier, which is conducive to the efficient enrichment of microorganisms, and the aeration system at the bottom is beneficial to the gas The scouring of the aging biofilm on the fixed fiber filler ensures the vitality of the biofilm in the aerobic zone, and at the same time does not depend on the denitrification of the suspended sludge, which reduces the concentration of suspended solids in the water, reduces the backflow wear of the nitrifying liquid, and also increases The water content and service life of the MBR membrane.

附图说明Description of drawings

图1为本发明所述全膜化污水生物脱氮处理装置，其中，1-缺氧膜池，2-好氧膜池，3-MBR 膜系统，4-回流系统，5-悬浮移动填料，6-推流器，7-进水管，8-缺氧曝气系统，9-固定纤维填料，10-进气管，11-老生物膜出口，12-出水口，13-好氧曝气系统。Fig. 1 is the full-membrane sewage biological denitrification treatment device of the present invention, wherein, 1-anoxic membrane tank, 2-aerobic membrane tank, 3-MBR membrane system, 4-reflux system, 5-suspended mobile filler, 6-Flower, 7-Inlet pipe, 8-Anoxic aeration system, 9-Fixed fiber filler, 10-Inlet pipe, 11-Old biofilm outlet, 12-Water outlet, 13-Aerobic aeration system.

图2为实施例1所述的聚乙烯移动膜悬浮移动填料的实物图。Fig. 2 is the physical picture of the polyethylene mobile film suspended mobile filler described in Example 1.

图3为实施例1所述的固定纤维填料的实物图。Fig. 3 is the actual picture of the fixed fiber filler described in embodiment 1.

图4为本发明所述的聚乙烯移动膜填料和海绵膜的组合的实物图。Fig. 4 is the actual picture of the combination of polyethylene mobile membrane filler and sponge membrane according to the present invention.

具体实施方式detailed description

实施例1Example 1

如图1所述的全膜化污水生物脱氮处理装置，其中缺氧膜池1的体积为1m3，所述缺氧膜池1内添加聚乙烯移动膜悬浮移动填料(如图2所示)，填充度为40％；好氧膜池2的体积为5m3，所述好氧膜池2内添加固定纤维填料(如图3所示)，填充度为60％；MBR膜系统3 中内置超滤膜；回流系统4采用回流泵回流，回流比为4:1；The full-membrane sewage biological denitrification treatment device as shown in Figure 1, wherein the volume of the anoxic membrane pool 1 is 1m 3 , and polyethylene mobile membrane suspension mobile filler is added in the anoxic membrane pool 1 (as shown in Figure 2 ), the filling degree is 40%; the volume of the aerobic membrane pool 2 is 5m 3 , and a fixed fiber filler (as shown in Figure 3 ) is added in the aerobic membrane pool 2, and the filling degree is 60%; in the MBR membrane system 3 Built-in ultrafiltration membrane; the reflux system 4 uses a reflux pump to reflux, and the reflux ratio is 4:1;

污水处理过程：Sewage treatment process:

待处理污水：氨氮浓度为100mg/L，COD浓度为500mg/L；Sewage to be treated: the concentration of ammonia nitrogen is 100mg/L, and the concentration of COD is 500mg/L;

关闭缺氧曝气系统8，开启推流器6和好氧曝气系统13，将待处理污水由进水管7依次进入缺氧膜池1进行缺氧处理和好氧膜池2进行好氧处理，并将好氧处理后得到的硝化液一部分通过回流系统4回流至缺氧膜池1，剩余部分通过MBR膜系统3处理实现泥水分离，无需污泥回流，系统悬浮污泥浓度(MLVSS)浓度小于80mg/L，其中MBR膜系统3的出水中 COD浓度为33mg/L，硝酸盐浓度为5mg/L，总氮浓度为10mg/L，总氮去除率为90％，总氮去除速率达到1.5kg/(m3·d)(所述总氮的去除速率为总氮的去除时间除以停留时间)；Turn off the anoxic aeration system 8, turn on the pusher 6 and the aerobic aeration system 13, and the sewage to be treated is sequentially entered into the anoxic membrane pool 1 through the water inlet pipe 7 for anoxic treatment and the aerobic membrane pool 2 for aerobic treatment , and a part of the nitrification liquid obtained after aerobic treatment is returned to the anoxic membrane pool 1 through the reflux system 4, and the remaining part is treated through the MBR membrane system 3 to realize the separation of mud and water, without sludge reflux, and the concentration of suspended sludge in the system (MLVSS) The concentration of COD in the effluent of MBR membrane system 3 is 33mg/L, the concentration of nitrate is 5mg/L, the concentration of total nitrogen is 10mg/L, the removal rate of total nitrogen is 90%, and the removal rate of total nitrogen reaches 1.5 kg/(m 3 ·d) (the removal rate of the total nitrogen is the removal time of the total nitrogen divided by the residence time);

当所述缺氧膜池1中悬浮移动填料5上的生物膜老化后，打开缺氧曝气系统8，使老化后的生物膜脱落，所述缺氧曝气系统8的进气量与所述缺氧膜池1的进水量的体积比为20:1，持续时间为2h；After the biofilm on the suspended mobile packing 5 in the described anoxic membrane pool 1 is aged, the anoxic aeration system 8 is opened to make the aged biofilm come off, and the intake air volume of the anoxic aeration system 8 is the same as that of the anoxic aeration system 8. The volume ratio of the water intake of the anoxic membrane pool 1 is 20:1, and the duration is 2h;

当所述好氧膜池2中固定纤维填料9上的生物膜老化后，增大所述好氧曝气系统13的曝气量，使老化后的生物膜脱落，所述好氧膜池2中进气量与进水量的体积比为9:1；After the biofilm on the fixed fiber filler 9 in the aerobic membrane pool 2 is aged, increase the aeration rate of the aerobic aeration system 13 to make the aged biofilm come off, and the aerobic membrane pool 2 The volume ratio of air intake to water intake is 9:1;

上述处理过程经过360天的运行后，缺氧膜池1的聚乙烯移动膜悬浮移动填料和好氧膜池2的固定纤维填料上的生物膜均具有较强的氮转化活性，缺氧膜池1的脱氮能力达到5kg/(m3·d)，好氧膜池2的硝化能力达到2kg/(m3·d)；MBR膜系统的产水率仍维持在80％。After 360 days of operation of the above-mentioned treatment process, the biofilms on the polyethylene mobile membrane suspended mobile packing in the anoxic membrane pool 1 and the fixed fiber packing in the aerobic membrane pool 2 both had strong nitrogen conversion activity, and the anoxic membrane pool The nitrogen removal capacity of 1 reaches 5kg/(m 3 ·d), and the nitrification capacity of aerobic membrane pool 2 reaches 2kg/(m 3 ·d); the water production rate of the MBR membrane system remains at 80%.

以上所述的实施例仅是对本发明的优选方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案做出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. A biological denitrification treatment method for sewage is characterized in that a full-membrane biological denitrification treatment device for sewage, which comprises an anoxic membrane tank (1), an aerobic membrane tank (2), an MBR (membrane bioreactor) membrane system (3) and a reflux system (4), is adopted for biological denitrification;
the anoxic membrane tank (1), the aerobic membrane tank (2) and the MBR membrane system (3) are sequentially connected;
two ends of the reflux system (4) are respectively connected with the anoxic membrane pool (1) and the aerobic membrane pool (2);
the anoxic membrane tank (1) comprises a flow impeller (6), a water inlet pipe (7), an anoxic aeration system (8) and a suspended mobile filler (5); the flow pushing direction of the flow pusher (6) is opposite to the air outlet direction of the anoxic aeration system (8);
the aerobic membrane tank (2) comprises a fixed fiber filler (9) and an aerobic aeration system (13) positioned right below the fixed fiber filler (9).
2. The biological denitrification treatment method for wastewater according to claim 1, wherein the filling degree of the suspended moving filler (5) in the anoxic membrane tank (1) is 40-60%.
3. The biological denitrification treatment method for sewage according to claim 1, wherein the suspended mobile filler (5) is a polyethylene mobile film filler, a sponge film or a combination of the polyethylene mobile film filler and the sponge film.
4. The biological denitrification treatment method for sewage according to claim 1, wherein the degree of filling of the fixed fiber filler (9) in the aerobic membrane tank (2) is 40-60%.
5. The biological nitrogen removal treatment method for sewage according to any one of claims 1 to 4, wherein the anoxic membrane tank (1) and the aerobic membrane tank (2) are constructed in common wall.
6. The biological denitrification treatment process for sewage according to claim 1, wherein the aerobic aeration system (13) and the anoxic aeration system (8) employ microporous aeration conduits.
7. The biological denitrification treatment method for sewage according to claim 1, wherein the MBR membrane system (3) is an external membrane.
8. The biological denitrification treatment method for sewage according to claim 1, wherein the reflux system (4) employs a gas lift reflux or a reflux pump reflux.
9. The biological nitrogen removal treatment process for wastewater according to any one of claims 1 to 4 or 6 to 8, wherein the treatment process comprises the steps of:
closing the anoxic aeration system (8), starting the flow pushing device (6) and the aerobic aeration system (13), sequentially feeding sewage into the anoxic membrane tank (1) from the water inlet pipe (7) for anoxic treatment and the aerobic membrane tank (2) for aerobic treatment, refluxing a part of nitrified liquid obtained after the aerobic treatment to the anoxic membrane tank (1) through the reflux system (4), and treating the rest part through the MBR membrane system (3) to realize sludge-water separation;
after the biological membrane on the suspended mobile filler (5) in the anoxic membrane tank (1) is aged, opening an anoxic aeration system (8) to enable the aged biological membrane to fall off;
when the biological membrane on the fixed fiber filler (9) in the aerobic membrane tank (2) is aged, the aeration amount of the aerobic aeration system (13) is instantly increased, so that the aged biological membrane falls off.
10. Use of the treatment method according to any one of claims 1 to 4 or 6 to 8 for biological denitrification of wastewater.
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