技术领域technical field
本发明属于污水处理与环境保护领域，具体涉及一种污水处理和N2O减排的耦合装置及其运行方法。The invention belongs to the field of sewage treatment and environmental protection, and in particular relates to a coupling device for sewage treatment andN2O emission reduction and an operating method thereof.
背景技术Background technique
污水生物脱氮除磷工艺被广泛应用于城市污水处理厂，主要用于去除污水中的氮磷污染物，以控制水体的富营养化。生物脱氮过程包括：（1）硝化作用，即硝化菌将污水中的氨氮转化为硝酸盐；（2）反硝化作用，即反硝化菌利用有机物作为反硝化碳源将硝酸盐还原为N2，从而达到将氮从污水中脱除的目的。Sewage biological nitrogen and phosphorus removal process is widely used in urban sewage treatment plants, mainly used to remove nitrogen and phosphorus pollutants in sewage to control eutrophication of water bodies. The biological denitrification process includes: (1) nitrification, that is, nitrifying bacteria convert ammonia nitrogen in sewage into nitrate; (2) denitrification, that is, denitrifying bacteria use organic matter as a denitrifying carbon source to reduce nitrate toN2 , so as to achieve the purpose of removing nitrogen from sewage.
氧化亚氮（N2O）是全球3大主要的温室气体之一，其增温势能分别约为CO2的310倍、CH4的4-30倍。大气中90%以上的N2O来源于生物氮循环过程，其中污水生物脱氮是N2O的一个重要产生源，每年排放的N2O量约为(0.13-3.00)×1012kg，占全球N2O总排放量的21.5%-25.0%，且有日益增加的趋势。N2O是生物硝化和反硝化过程的产物，生物脱氮过程中不可避免地会释放N2O气体。因此，如何在保证污水生物脱氮效果的同时实现N2O的减排是全球污水处理厂面临的一个重要难题。Nitrous oxide (N2 O) is one of the three major greenhouse gases in the world, and its warming potential energy is about 310 times that of CO2 and 4-30 times that of CH4 . More than 90% of the N2 O in the atmosphere comes from the biological nitrogen cycle process, and the biological denitrification of sewage is an important source of N2 O, and the annual N2 O emission is about (0.13-3.00)×1012 kg, It accounts for 21.5%-25.0% of the total global N2 O emissions, and there is an increasing trend. N2 O is the product of biological nitrification and denitrification process, and N2 O gas will inevitably be released in the process of biological denitrification. Therefore, how to reduce N2 O emissions while ensuring the effect of biological denitrification of sewage is an important problem faced by global sewage treatment plants.
发明内容Contents of the invention
本发明解决的技术问题是提供了一种污水处理和N2O减排的耦合装置及其运行方法，该组合装置的水处理工艺主体为污水处理常用的生物脱氮工艺：缺氧/好氧（AO）、厌氧/缺氧/好氧（A2O）等；N2O的减排包括两部分，一是由集气罩收集污水脱氮过程中产生的N2O气体，传输进入填料吸收塔利用气液传质将气体N2O传入液相；二是将溶解了N2O的污水输送到缺氧池，通过缺氧池中的反硝化作用将溶解态的N2O还原为N2，该过程所用的吸收水为好氧池与缺氧池的内循环污水，在实现污水处理工艺内循环的同时，这部分污水将水处理过程产生的N2O吸收并输送到缺氧池，在反硝化作用下将N2O还原为N2，达到了N2O减排的目的，实现“一水两用”，避免增加额外运行费用。The technical problem solved by the present invention is to provide a coupling device for sewage treatment and N2 O emission reduction and its operation method. The main body of the water treatment process of the combined device is the biological denitrification process commonly used in sewage treatment: anoxic/aerobic (AO), anaerobic/anoxic/aerobic (A2 O), etc.; N2 O emission reduction includes two parts, one is to collect the N2 O gas generated in the sewage denitrification process by the gas collection hood, and transmit it into the The packed absorption tower uses gas-liquid mass transfer to transfer the gas N2 O into the liquid phase; the second is to transport the sewage dissolved in N2 O to the anoxic tank, and the dissolved N2 O is denitrified in the anoxic tank. It is reduced to N2 . The absorption water used in this process is the internal circulation sewage of the aerobic pool and the anoxic pool. While realizing the internal circulation of the sewage treatment process, this part of the sewage absorbs and transports the N2 O produced in the water treatment process to the The anoxic pool reduces N2 O to N 2 under the action of denitrification, which achieves the purpose of reducing N2 O emissions, realizes "one water fortwo purposes", and avoids additional operating costs.
本发明为解决上述技术问题采用如下技术方案，一种污水处理和N2O减排的耦合装置，其特征在于包括缺氧处理池、好氧处理池、污泥沉淀池和填料吸收塔，缺氧处理池上部的缺氧处理池进水口与污水排放管道连接，缺氧处理池中设有缺氧池搅拌器，缺氧处理池出水通过缺氧处理池出水口溢流进入好氧处理池，好氧处理池的底部设有与气泵相连的曝气管，好氧处理池上部的好氧处理池出水口通过管道与污泥沉淀池连接，污泥沉淀池的上部设有溢流堰和污泥沉淀池出水口，污泥沉淀池的下部设有污泥沉淀池排泥口，污泥沉淀池通过污泥回流泵和管道与缺氧处理池连接，缺氧处理池和好氧处理池的上方设有封闭的集气罩，该集气罩上部的集气罩出气口通过管道与填料吸收塔下部的填料吸收塔进气口连接，填料吸收塔顶部的填料吸收塔进水口通过循环泵和管道与好氧处理池连接，填料吸收塔底部的填料吸收塔出水口通过管道与缺氧处理池连接，填料吸收塔的内部设有喷淋系统、填料支撑板和填料层，其中喷淋系统设置于填料吸收塔的上部，填料层通过填料支撑板固定于填料吸收塔的中部，该填料层的填料为聚乙烯鲍尔环，填料吸收塔的上部设有填料吸收塔排气口。In order to solve the above technical problems, the present invention adopts the following technical scheme, a coupling device for sewage treatment and N2 O emission reduction, which is characterized in that it includes anoxic treatment pool, aerobic treatment pool, sludge sedimentation tank and packing absorption tower, lacking The water inlet of the anoxic treatment pool on the upper part of the anoxic treatment pool is connected to the sewage discharge pipe. An anoxic pool agitator is installed in the anoxic treatment pool. The effluent from the anoxic treatment pool overflows into the aerobic treatment pool through the outlet of the anoxic treatment pool The bottom of the aerobic treatment tank is provided with an aeration pipe connected to the air pump, and the outlet of the aerobic treatment tank on the upper part of the aerobic treatment tank is connected to the sludge sedimentation tank through a pipeline. The upper part of the sludge sedimentation tank is provided with an overflow weir and a sewage The outlet of the sludge settling tank, the lower part of the sludge settling tank is provided with the sludge discharge port of the sludge settling tank, the sludge settling tank is connected to the anoxic treatment tank through the sludge return pump and pipeline, the anoxic treatment tank and the aerobic treatment tank A closed gas collection hood is arranged above, and the air outlet of the gas collection hood on the upper part of the gas collection hood is connected with the air inlet of the packed absorption tower at the lower part of the packed absorption tower through a pipeline, and the water inlet of the packed absorption tower at the top of the packed absorption tower is passed through the circulation pump and The pipeline is connected to the aerobic treatment tank, and the outlet of the packed absorption tower at the bottom of the packed absorption tower is connected to the anoxic treatment tank through a pipeline. The inside of the packed absorption tower is equipped with a spray system, a packing support plate and a packing layer, and the spray system is set On the upper part of the packing absorption tower, the packing layer is fixed in the middle part of the packing absorption tower through the packing support plate. The packing of the packing layer is polyethylene Pall ring, and the upper part of the packing absorption tower is provided with the exhaust port of the packing absorption tower.
本发明所述的污水处理和N2O减排的耦合装置的运行方法，其特征在于具体步骤为：污水通过缺氧处理池上部的缺氧处理池进水口进入缺氧处理池，污水在缺氧处理池中的停留时间为1.5-2h，缺氧处理池中设有缺氧池搅拌器用于保持污水处理装置中污泥处于悬浮的状态，搅拌速率为500r/min；缺氧处理池中处理过的污水通过缺氧处理池出水口溢流进入好氧处理池，污水在好氧处理池中的停留时间为6-8h，好氧处理池的底部设有与气泵相连的曝气管，气泵通过曝气管在好氧处理池中进行曝气用于维持好氧处理池中泥水混合物的溶解氧浓度，溶解氧浓度控制在1.5-3mg/L；好氧处理池中处理过的污水通过好氧处理池出水口溢流进入污泥沉淀池，污水在污泥沉淀池中的停留时间为1-2h，污泥沉淀池中沉淀后的污水通过污泥沉淀池溢流堰溢流后经污泥沉淀池出水口排出，经污泥沉淀池中沉淀后的污泥部分由污泥回流泵回流至缺氧处理池用于保持足够的微生物浓度，污泥回流比为100%-200%，剩余污泥则由污泥沉淀池排泥口排出；填料吸收塔中的污水通过填料吸收塔出水口排入缺氧处理池，该过程实现了缺氧与好氧处理过程中内回流液循环的回流，同时循环水还作为填料塔的吸收剂，吸收通过集气罩收集的污水处理过程中产生的N2O，内循环液再通过循环泵将好氧处理池中硝化过程产生的硝酸盐输送到缺氧处理池进行反硝化，同时还吸收了气体中的N2O，溶解态的N2O随着内循环液进入缺氧处理池，在反硝化作用下，溶解态N2O被还原为N2，大幅度减少了污水处理过程N2O的排放量。The operation method of the coupling device for sewage treatment and N2 O emission reduction according to the present invention is characterized in that the specific steps are: the sewage enters the anoxic treatment pool through the water inlet of the anoxic treatment pool on the upper part of the anoxic treatment pool, and the sewage enters the anoxic treatment pool in the anoxic treatment pool. The residence time in the oxygen treatment tank is 1.5-2h, and the anoxic tank agitator is provided in the anoxic treatment tank to keep the sludge in the sewage treatment device in a suspended state, and the stirring rate is 500r/min; the treatment in the anoxic treatment tank The treated sewage overflows into the aerobic treatment tank through the outlet of the anoxic treatment tank. The residence time of the sewage in the aerobic treatment tank is 6-8h. The bottom of the aerobic treatment tank is equipped with an aeration pipe connected to the air pump. Aeration is carried out in the aerobic treatment tank through the aeration pipe to maintain the dissolved oxygen concentration of the mud-water mixture in the aerobic treatment tank, and the dissolved oxygen concentration is controlled at 1.5-3mg/L; the treated sewage in the aerobic treatment tank passes through the well The overflow of the outlet of the oxygen treatment tank enters the sludge sedimentation tank, and the residence time of the sewage in the sludge sedimentation tank is 1-2h. The sludge is discharged from the outlet of the sludge sedimentation tank, and the part of the sludge settled in the sludge sedimentation tank is returned to the anoxic treatment tank by the sludge return pump to maintain sufficient microbial concentration. The sludge return ratio is 100%-200%, and the remaining The sludge is discharged from the sludge outlet of the sludge sedimentation tank; the sewage in the packed absorption tower is discharged into the anoxic treatment tank through the outlet of the packed absorption tower. At the same time, the circulating water is also used as the absorbent of the packed tower, absorbing the N2 O produced in the sewage treatment process collected by the gas collecting hood, and the internal circulating liquid transports the nitrate produced in the nitrification process in the aerobic treatment tank to the The anoxic treatment tank performs denitrification, and at the same time absorbs N2 O in the gas. The dissolved N2 O enters the anoxic treatment tank along with the internal circulation liquid. Under the action of denitrification, the dissolved N2 O is reduced to N2 , greatly reducing the discharge of N2 O in the sewage treatment process.
本发明与现有技术相比具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1、设备简单，运行费用低，不产生二次污染；1. The equipment is simple, the operating cost is low, and no secondary pollution is generated;
2、保持污水处理效果的同时可实现污水生物脱氮过程中N2O的大幅减排；2. While maintaining the sewage treatment effect, it can realize the substantial reduction of N2 O in the process of biological denitrification of sewage;
3、应用范围广，可应用于缺氧/好氧工艺（AO）、厌氧缺氧好氧工艺（A2O）、氧化沟等现有常见污水处理工艺；3. It has a wide range of applications, and can be applied to existing common sewage treatment processes such as anoxic/aerobic process (AO), anaerobic anoxic-oxic process (A2O), and oxidation ditch;
4、对现有污水处理工艺改造时，只需增设填料吸收塔和集气罩，简单易行，可操作性强。4. When revamping the existing sewage treatment process, it is only necessary to add packing absorption towers and gas collecting hoods, which is simple and easy to operate.
附图说明Description of drawings
图1是本发明的结构示意图。Fig. 1 is a schematic structural view of the present invention.
图中：1-缺氧处理池进水口；2-缺氧处理池；3-缺氧池搅拌器；4-缺氧处理池出水口；5-好氧处理池；6-曝气管；7-好氧处理池出水口；8-气泵；9-污泥沉淀池；10-溢流堰，11-污泥沉淀池出水口；12-污泥沉淀池排泥口；13-污泥回流泵；14-填料吸收塔；15-集气罩；16-填料吸收塔进气口；17-集气罩出气口；18-循环泵；19-密封法兰；20-填料吸收塔进水口；21-喷淋系统；22-填料支撑板；23-填料层；24-填料吸收塔排气口；25-填料吸收塔出水口。In the figure: 1-water inlet of anoxic treatment tank; 2-anoxic treatment tank; 3-mixer of anoxic tank; 4-outlet of anoxic treatment tank; 5-aerobic treatment tank; 6-aeration pipe; 7 -Aerobic treatment tank outlet; 8-air pump; 9-sludge sedimentation tank; 10-overflow weir, 11-sludge sedimentation tank outlet; 12-sludge sedimentation tank outlet; 13-sludge return pump ;14-packing absorption tower; 15-gathering hood; 16-inlet of packing absorption tower; 17-gas outlet of gas gathering hood; 18-circulation pump; 19-sealing flange; -spray system; 22-packing support plate; 23-packing layer; 24-exhaust port of packing absorption tower; 25-water outlet of packing absorption tower.
具体实施方式detailed description
结合附图详细描述本发明的具体内容。如图1所示，一种污水处理与N2O减排的耦合装置，包括缺氧处理池2、好氧处理池5、填料吸收塔14和污泥沉淀池9，具体连接方式为：缺氧处理池2出水通过缺氧处理池出水口4进入好氧处理池5，好氧处理池5出水通过好氧处理池出水口7进入污泥沉淀池9，集气罩15收集的废气由集气罩出气口17送入填料吸收塔14中，好氧处理池5中一部分污水由循环泵18送入填料吸收塔14中，填料吸收塔14的填料吸收塔出水口25与缺氧处理池2连接，缺氧处理池2和污泥沉淀池9由污泥回流泵13连接。The specific content of the present invention will be described in detail in conjunction with the accompanying drawings. As shown in Figure 1, a coupling device for sewage treatment and N2 O emission reduction, including anoxic treatment pool 2, aerobic treatment pool 5, packing absorption tower 14 and sludge sedimentation tank 9, the specific connection method is: The effluent from the oxygen treatment tank 2 enters the aerobic treatment tank 5 through the outlet 4 of the anoxic treatment tank, the effluent from the aerobic treatment tank 5 enters the sludge sedimentation tank 9 through the outlet 7 of the aerobic treatment tank, and the waste gas collected by the gas collection hood 15 is collected by the collector The air outlet 17 of the gas hood is sent into the packing absorption tower 14, and a part of sewage in the aerobic treatment tank 5 is sent into the packing absorption tower 14 by the circulation pump 18, and the packing absorption tower water outlet 25 of the packing absorption tower 14 is connected with the anoxic treatment tank 2 Connection, anoxic treatment tank 2 and sludge settling tank 9 are connected by sludge return pump 13.
处理污水通过缺氧处理池2上部的缺氧处理池进水口1进入缺氧处理池2，污水在缺氧处理池2中的停留时间为1.5-2h，缺氧处理池2中处理过的污水通过缺氧处理池出水口4溢流进入好氧处理池5，该过程仅依靠重力流动，不产生额外能耗；污水在好氧处理池5中的停留时间为6-8h，好氧处理池5中处理过的污水通过好氧处理池出水口7溢流进入污泥沉淀池9，该过程仅依靠重力流动，不产生额外能耗；污水在污泥沉淀池9中的停留时间为1-2h，污泥沉淀池9中沉淀后的污水通过污泥沉淀池溢流堰10溢流后经污泥沉淀池出水口11排出，该过程仅靠重力流动，不产生额外能耗，经污泥沉淀池9中沉淀后的污泥部分由污泥回流泵13回流至缺氧处理池2，污泥回流比为100%-200%，用于保持足够的微生物浓度，剩余污泥则由污泥沉淀池排泥口12排出。The treated sewage enters the anoxic treatment pool 2 through the anoxic treatment pool inlet 1 on the upper part of the anoxic treatment pool 2, and the residence time of the sewage in the anoxic treatment pool 2 is 1.5-2h. The overflow of the outlet 4 of the anoxic treatment pool enters the aerobic treatment pool 5. This process only relies on gravity flow and does not generate additional energy consumption; the residence time of sewage in the aerobic treatment pool 5 is 6-8h, and the aerobic treatment pool The sewage treated in 5 overflows into the sludge sedimentation tank 9 through the outlet 7 of the aerobic treatment tank. This process only relies on gravity flow and does not generate additional energy consumption; 2h, the settled sewage in the sludge settling tank 9 overflows through the overflow weir 10 of the sludge settling tank and then is discharged through the outlet 11 of the sludge settling tank. The sludge after sedimentation in the sedimentation tank 9 is returned to the anoxic treatment tank 2 by the sludge return pump 13, and the sludge return ratio is 100%-200%, which is used to maintain sufficient microbial concentration, and the remaining sludge is returned by the sludge The sludge outlet 12 of the sedimentation tank is discharged.
缺氧处理池2中设有缺氧池搅拌器3以保持污水处理装置中污泥的悬浮状态，搅拌速率约为500r/min；好氧处理池5中设有曝气管6，气泵8与曝气管6连接，装置运行时，气泵8通过曝气管6在好氧处理池5中进行曝气，以维持好氧处理池5中泥水混合物的溶解氧浓度，溶解氧浓度控制在1.5-3mg/L；填料吸收塔14中的污水通过填料吸收塔出水口25排入缺氧处理池2，该过程不仅实现了缺氧与好氧处理过程中内回流液循环的回流，同时循环水还作为填料吸收塔的吸收剂，吸收通过集气罩15收集的污水处理过程中产生的N2O，实现“一水两用”，并且不增加额外运行费用。内循环液在通过循环泵18将好氧处理池5中硝化过程产生的硝酸盐输送到缺氧处理池2进行反硝化，同时还吸收了气体中的N2O，溶解态的N2O随着内循环液进入缺氧处理池2，在反硝化作用下，溶解态N2O被还原为N2，从而大幅度减少了污水处理过程N2O的排放量。Anoxic tank agitator 3 is provided in anoxic treatment tank 2 to keep the suspended state of sludge in the sewage treatment plant, and the stirring rate is about 500r/min; aeration pipe 6 is provided in aerobic treatment tank 5, and air pump 8 and The aeration pipe 6 is connected, and when the device is running, the air pump 8 is aerated in the aerobic treatment tank 5 through the aeration pipe 6, so as to maintain the dissolved oxygen concentration of the mud-water mixture in the aerobic treatment tank 5, and the dissolved oxygen concentration is controlled at 1.5- 3mg/L; the sewage in the packing absorption tower 14 is discharged into the anoxic treatment pool 2 through the water outlet 25 of the packing absorption tower. As the absorbent of the packed absorption tower, it absorbs the N2 O produced in the sewage treatment process collected by the gas collecting hood 15, realizing "one water and two uses", and does not increase additional operating costs. The internal circulating liquid transports the nitrate produced in the nitrification process in the aerobic treatment tank 5 to the anoxic treatment tank 2 for denitrification through the circulating pump 18, and also absorbs N2 O in the gas, and the dissolved N2 O The internal circulating fluid enters the anoxic treatment tank 2, and the dissolved N2 O is reduced to N2 under the action of denitrification, thereby greatly reducing the discharge of N2 O in the sewage treatment process.
本装置设有填料吸收塔14用于内循环液对污水处理过程释放N2O的吸收，填料吸收塔14塔体材质为PVC，塔体内填料使用聚乙烯鲍尔环，该填料具有通量大、阻力小、分离效率高及操作弹性大等优点，并且成本低廉，适合大规模污水处理过程使用；另外，这种填料有利于内循环液在填料塔内的均匀分布，增大水体和气体的接触面积，有效促进水体紊流状态减少层流流态，从而加强内循环液和N2O之间的气液传质效率；所述填料吸收塔14内部设有喷淋系统21、填料支撑板22及填料层23，喷淋系统能促进内循环液在填料中的均匀分布，增加气液接触面积，加强液体的紊流状态，从而增强N2O吸收效率；缺氧处理池2和好氧处理池5上部设有集气罩15收集废气，所述集气罩15为梯形体，下部敞口，上部密封，上部设有集气罩出气口17，下部与缺氧-好氧处理池上部通过密封法兰19密封连接；集气罩15所收集的废气为含有N2O的混合气体，集气罩出气口17与填料吸收塔进气口16相连，气体在好氧区曝气过程中气体动力作用下进入集气罩15并通过集气罩出气口17进入填料吸收塔14，无需设置气泵用于气体的传输，避免系统运行额外费用的增加；好氧处理池5中的污水由循环泵18泵入填料吸收塔14，通过填料吸收塔14上部的填料吸收塔进水口20进入填料吸收塔14，喷淋系统21将污水逆向气流喷洒，有利于N2O和内循环液的充分接触，增加吸收效率；内循环液的用量可利用循环泵18进行调节，通过控制液体速率，调整系统整体的运行状态和对N2O的吸收，以提高N2O的溶解率；随后污水通过填料吸收塔14底部的填料吸收塔出水口25排入缺氧处理池2，该过程主要依靠重力作用，无需额外运行费用；在缺氧处理池2中，溶解态的N2O利用污水中存在的有机碳源进行缺氧反硝化反应，最终被还原为N2，填料吸收塔14内其余的废气由填料吸收塔14上部的填料吸收塔排气口24排出。The device is equipped with a packing absorption tower 14 for the absorption of N2 O released by the internal circulating fluid in the sewage treatment process. The tower body of the packing absorption tower 14 is made of PVC, and the packing in the tower uses polyethylene Pall rings. The packing has a large flux , small resistance, high separation efficiency and large operating flexibility, etc., and low cost, suitable for large-scale sewage treatment process; in addition, this kind of packing is conducive to the uniform distribution of internal circulating liquid in the packing tower, increasing the volume of water and gas The contact area can effectively promote the turbulent flow state of the water body and reduce the laminar flow state, thereby enhancing the gas-liquid mass transfer efficiency between the internal circulating liquid andN2O ; the inside of the packed absorption tower 14 is equipped with a spray system 21 and a packing support plate 22 and packing layer 23, the spray system can promote the uniform distribution of the internal circulating liquid in the packing, increase the gas-liquid contact area, strengthen the turbulent state of the liquid, thereby enhancing the N2 O absorption efficiency; the anoxic treatment pool 2 and the aerobic The upper part of the processing tank 5 is provided with a gas collecting hood 15 to collect waste gas. The gas collecting hood 15 is a trapezoidal body with an open bottom and a sealed upper part. It is sealed and connected through the sealing flange 19; the exhaust gas collected by the gas collection hood 15 is a mixed gas containing N2 O, and the gas collection hood gas outlet 17 is connected with the inlet 16 of the packed absorption tower, and the gas is aerated in the aerobic zone Under the action of gas power, it enters the gas collection hood 15 and enters the packed absorption tower 14 through the gas collection hood gas outlet 17. There is no need to set up an air pump for gas transmission, which avoids the increase of additional costs for system operation; the sewage in the aerobic treatment pool 5 is circulated The pump 18 pumps into the packing absorption tower 14, enters the packing absorption tower 14 through the packing absorption tower water inlet 20 on the upper part of the packing absorption tower 14, and the spray system 21 sprays the sewage against the air flow, which is conducive to the full contact of N2 O and the internal circulation liquid , to increase the absorption efficiency; the amount of internal circulating liquid can be adjusted by the circulating pump 18, and by controlling the liquid rate, the overall operating state of the system and the absorption of N2 O can be adjusted to increase the dissolution rate of N2 O; then the sewage passes through the filler The water outlet 25 of the packing absorption tower at the bottom of the absorption tower 14 is discharged into the anoxic treatment pool 2, and this process mainly relies on gravity without additional operating costs; in the anoxic treatment pool2 , the dissolved N2O utilizes the The organic carbon source undergoes anoxic denitrification reaction and is finally reduced to N2 . The rest of the waste gas in the packed absorption tower 14 is discharged from the exhaust port 24 of the packed absorption tower 14 at the upper part of the packed absorption tower 14 .
实施例1Example 1
以某小区排放的生活污水为例，污水进水水质为：COD浓度400mg/L，NH4+-N浓度45mg/L，TN浓度50mg/L，污水处理量为80L/d，反应器接种污泥采用污水处理厂好氧处理池新鲜活性污泥，反应器内污泥浓度维持在2500-3000mg/L，好氧处理池DO维持在1.5-2mg/L，污泥泥龄维持在12d。Taking the domestic sewage discharged from a residential area as an example, the influent quality of sewage is: COD concentration 400mg/L, NH4+ -N concentration 45mg/L, TN concentration 50mg/L, sewage treatment capacity 80L/d, reactor inoculation sewage The sludge is fresh activated sludge from the aerobic treatment tank of the sewage treatment plant. The sludge concentration in the reactor is maintained at 2500-3000 mg/L, the DO in the aerobic treatment tank is maintained at 1.5-2 mg/L, and the sludge age is maintained at 12 days.
（1）污水处理：污水经缺氧处理池和好氧处理池处理后的出水主要污染物浓度及去除率如表1所示，出水达到城镇污水处理一级B标准。(1) Sewage treatment: The concentration and removal rate of main pollutants in the effluent treated by the anoxic treatment tank and the aerobic treatment tank are shown in Table 1, and the effluent meets the first-class B standard of urban sewage treatment.
（2）污泥处理：经处理的好氧处理池内的泥水混合物通过好氧处理池出水口进入污泥沉淀池，沉淀1-2h后的污泥一部分由污泥回流泵回流到缺氧处理池以保持缺氧处理池内的污泥浓度，其余污泥作为剩余通过污泥沉淀池排泥口排出，经过沉淀后的上清液通过沉淀池上部的排水口排出。(2) Sludge treatment: The mud-water mixture in the treated aerobic treatment tank enters the sludge sedimentation tank through the outlet of the aerobic treatment tank, and part of the sludge after settling for 1-2 hours is returned to the anoxic treatment tank by the sludge return pump In order to maintain the sludge concentration in the anoxic treatment tank, the rest of the sludge is discharged through the sludge outlet of the sludge sedimentation tank as surplus, and the supernatant after sedimentation is discharged through the outlet of the upper part of the sedimentation tank.
（3）气体收集：缺氧处理池和好氧处理池处理污水过程中逸散的N2O及其他气体组成的混合气体在好氧处理池曝气过程气体动力作用下进入集气罩，通过集气罩进入填料吸收塔。(3) Gas collection: The mixed gas composed of N2 O and other gases dissipated during the sewage treatment process in the anoxic treatment tank and the aerobic treatment tank enters the gas collection hood under the action of gas power during the aeration process of the aerobic treatment tank, and passes through The gas collecting hood enters the packed absorption tower.
（4）N2O气体的气液传质及还原：集气罩内的含有N2O的混合气体首先通过填料吸收塔下部进气口进入填料吸收塔，同时好氧处理池内的污水由填料吸收塔的上部的进水口输入并经喷淋系统均匀喷入均匀布撒在填料上，大部分N2O气体溶解到水中，随后污水排入缺氧处理池，一方面可以为缺氧处理池提供反硝化底物硝酸盐，另一方面溶解的N2O被缺氧反硝化还原为N2。(4) Gas-liquid mass transfer and reduction of N2 O gas: the mixed gas containing N2 O in the gas collection hood first enters the packed absorption tower through the lower air inlet of the packed absorption tower, and at the same time, the sewage in the aerobic treatment tank is discharged by the packing The water inlet on the upper part of the absorption tower is input and evenly sprayed into the filler through the spray system, and most of the N2 O gas is dissolved in the water, and then the sewage is discharged into the anoxic treatment pool. On the one hand, it can be an anoxic treatment pool. Provide denitrification substrate nitrate, on the other hand dissolved N2 O is reduced to N2 by anoxic denitrification.
污水处理过程中释放的N2O处理前后浓度如表2所示，经本装置应用实施后，N2O释放量减少了93%，避免了大量N2O直接释放到空气中。The concentration of N2 O released during sewage treatment before and after treatment is shown in Table 2. After the application of this device, the release of N2 O was reduced by 93%, avoiding the direct release of a large amount of N2 O into the air.
表1污水处理前后主要污染物浓度变化及去除率（mg/L）Table 1 Concentration changes and removal rates of main pollutants before and after sewage treatment (mg/L)
表2 N2O处理前后浓度变化（ppm）Table 2 Concentration changes before and after N2 O treatment (ppm)
实施例2Example 2
以某污水处理厂处理污水为例，污水进水水质为：COD浓度470mg/L，NH4+-N浓度53mg/L，TN浓度58mg/L，污水处理量为80L/d，反应器接种污泥采用污水处理厂好氧处理池新鲜活性污泥，反应器内污泥浓度维持在3500-4000 mg/L，好氧处理池DO维持在1.5-2mg/L，污泥泥龄维持在15d。Taking sewage treatment of a sewage treatment plant as an example, the quality of sewage influent is: COD concentration 470mg/L, NH4+ -N concentration 53mg/L, TN concentration 58mg/L, sewage treatment capacity 80L/d, reactor inoculation sewage The sludge is fresh activated sludge from the aerobic treatment tank of the sewage treatment plant. The sludge concentration in the reactor is maintained at 3500-4000 mg/L, the DO in the aerobic treatment tank is maintained at 1.5-2 mg/L, and the sludge age is maintained at 15 days.
装置启动，经处理后的出水主要污染物浓度及去除率如表3所示，出水达到城镇污水处理一级B标准；污水处理过程中释放的N2O处理前后浓度如表4所示，经本装置应用实施后，N2O释放量减少了94%，避免了大量N2O直接释放到空气中。After the device was started, the concentration and removal rate of main pollutants in the treated effluent were shown in Table 3, and the effluent reached the first-class B standard of urban sewage treatment; the concentration of N2 O released during sewage treatment before and after treatment was shown in Table 4. After the application of this device, the release of N2 O was reduced by 94%, avoiding the direct release of a large amount of N2 O into the air.
表3污水处理前后主要污染物浓度变化及去除率（mg/L）Table 3 Concentration change and removal rate of main pollutants before and after sewage treatment (mg/L)
表4 N2O处理前后浓度变化（ppm）Table 4 Concentration changes before and after N2 O treatment (ppm)
本装置在减少污水生物脱氮过程中N2O气体大量排放的同时保证了污水处理效率，同时不增加额外的运行费用，操作简单，无二次污染。本发明对于各种常见生物脱氮工艺改造简单易行，只需增设填料吸收塔。随着我国经济发展和城镇化水平的提高，生活污水处理量不断增大，N2O排放问题也日益严重，本发明对于缓解N2O带来的环境负面效应具有积极作用。The device can reduce a large amount of N2 O gas discharge in the process of biological denitrification of sewage, while ensuring the efficiency of sewage treatment, and at the same time does not increase additional operating costs, and is simple to operate and has no secondary pollution. The invention is simple and easy to transform various common biological denitrification processes, and only needs to add packing absorption towers. With the improvement of China's economic development and urbanization level, the amount of domestic sewage treatment continues to increase, and the problem of N2 O discharge is also becoming more and more serious. The invention has a positive effect on alleviating the negative environmental effects brought by N2 O.
以上显示和描述了本发明的基本原理，主要特征和优点，在不脱离本发明精神和范围的前提下，本发明还有各种变化和改进，这些变化和改进都落入要求保护的本发明的范围。The basic principles, main features and advantages of the present invention have been shown and described above. On the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall into the claimed invention. range.
| Application Number | Priority Date | Filing Date | Title |
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| CN201610650607.3ACN106277570A (en) | 2016-08-10 | 2016-08-10 | A coupling device for sewage treatment and N2O emission reduction and its operation method |
| Application Number | Priority Date | Filing Date | Title |
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| CN201610650607.3ACN106277570A (en) | 2016-08-10 | 2016-08-10 | A coupling device for sewage treatment and N2O emission reduction and its operation method |
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| CN106277570Atrue CN106277570A (en) | 2017-01-04 |
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| CN201610650607.3APendingCN106277570A (en) | 2016-08-10 | 2016-08-10 | A coupling device for sewage treatment and N2O emission reduction and its operation method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | Application publication date:20170104 | |
| WD01 | Invention patent application deemed withdrawn after publication |