CN105621806B - A kind of biological coagulation oxidation technology of quick processing kitchen garbage, waste-water - Google Patents
A kind of biological coagulation oxidation technology of quick processing kitchen garbage, waste-water Download PDFInfo
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- 239000010813 municipal solid waste Substances 0.000 title abstract description 4
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
-
- 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
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- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
本发明提供一种快速处理餐厨垃圾废水的方法，具体为采用生物聚沉氧化工艺，包括生物聚沉除渣系统和生物氧化系统。其特征在于利用特异微生物菌群以餐厨垃圾废水为培养基并添加少量营养剂使其产生大量生物絮凝剂，通过吸附桥联作用、电荷中和作用和卷扫作用与废水中的SS发生聚合而沉淀，进一步利用固液分离设备进行固液分离除渣，分离出的泥饼通过发酵后生产有机肥，分离出的清澈废水经过进一步生物氧化单元处理后实现达标排放。
The invention provides a method for quickly treating kitchen garbage waste water, which specifically adopts a bio-accumulation oxidation process, including a bio-accumulation slag removal system and a bio-oxidation system. It is characterized in that it uses specific microbial flora to use kitchen waste wastewater as a medium and adds a small amount of nutrients to produce a large amount of biological flocculants, and polymerizes with SS in wastewater through adsorption bridging, charge neutralization and sweeping effects For precipitation, solid-liquid separation equipment is further used for solid-liquid separation and slag removal, and the separated mud cake is fermented to produce organic fertilizers, and the separated clear wastewater is further treated by a biological oxidation unit to achieve standard discharge.
Description
一、技术领域1. Technical field
本发明涉及一种废水处理工艺，特别涉及一种快速处理餐厨垃圾三相分离废水的工艺，属于环境工程技术领域。The invention relates to a wastewater treatment process, in particular to a process for rapidly treating kitchen waste three-phase separation wastewater, and belongs to the technical field of environmental engineering.
二、背景技术2. Background technology
餐厨垃圾是居民在生活消费过程中形成的生活废物，极易腐烂变质，散发恶臭，传播细菌和病毒。餐厨垃圾主要包括米、面食物残余、蔬菜、动植物油、肉骨等，从化学成分来说，有淀粉、纤维素、蛋白质、脂类和无机盐等。由于餐厨垃圾含水率高(70～90％)，且有机质含量高，适合采用生物法进行处理。Kitchen waste is the domestic waste formed by residents in the process of living consumption, which is easily rotten and deteriorated, emits foul smell, and spreads bacteria and viruses. Food waste mainly includes rice, noodles, food residues, vegetables, animal and vegetable oils, meat and bones, etc. In terms of chemical composition, it includes starch, cellulose, protein, lipids, and inorganic salts. Due to the high moisture content (70-90%) and high organic matter content of kitchen waste, it is suitable for biological treatment.
目前餐厨垃圾的处理方法主要采用收集后集中处理的方法，多数采用厌氧发酵的形式进行处理。其基本流程是：(1)将收集来的餐厨垃圾集中收运至餐厨垃圾处理厂的受料坑；(2)将垃圾进行机械分拣，回收去除各种塑料制品、玻璃/金属罐等非生物物质；(3)破碎制浆，然后70-90℃高温蒸煮；(4)采用三相分离机(一种卧螺式离心机)将上述浆液分为油脂部分，废水部分，和餐厨渣。油脂部分深加工制备成生物柴油，餐厨渣则可深加工成饲料、好氧发酵后做肥料、或者直接填埋或焚烧。三相分离废水部分则进入沼气池发酵制沼气，沼液再经过物化和生化处理，达标排放或排入管网进入市政污水处理厂进一步处理。At present, the treatment method of food waste mainly adopts the method of centralized treatment after collection, and most of them are treated in the form of anaerobic fermentation. The basic process is: (1) collect and transport the collected food waste to the receiving pit of the food waste treatment plant; (2) mechanically sort the waste, and recycle and remove various plastic products, glass/metal cans (3) Crushing and pulping, and then cooking at a high temperature of 70-90°C; (4) Using a three-phase separator (a horizontal screw centrifuge) to divide the above slurry into grease, waste water, and meal Kitchen scraps. Part of the oil is processed into biodiesel, and the kitchen waste can be further processed into feed, aerobically fermented as fertilizer, or directly landfilled or incinerated. The three-phase separation wastewater part enters the biogas digester for fermentation to produce biogas, and the biogas slurry is then treated through physicochemical and biochemical treatment, and discharged up to the standard or discharged into the pipe network into the municipal sewage treatment plant for further treatment.
然而，三相分离后的餐厨垃圾废水pH呈酸性(pH＜4.5)，悬浮物固体(SS)含量高(80000-100000mg/L)，COD高(多数在90000-120000mg/L)，此外，还含有大量氨氮、残余油脂等，是一种极难处理的高浓度有机废水。因此，导致厌氧发酵时间很长(通常在25-30天)，沼液处理困难，后期好氧厌氧处理仍长达近10天，而且出水仍然很难达标，表现在色度深，COD多数在500mg/L以上，需要进一步采用混凝气浮等物化措施进行深度处理。由于处理时间长，水又难达标，导致构筑物体积大，投资大，运行成本高。因此，解决上述餐厨垃圾废水在生化处理中的问题显得尤为重要。However, the pH of kitchen waste wastewater after three-phase separation is acidic (pH<4.5), the content of suspended solids (SS) is high (80000-100000mg/L), and the COD is high (mostly 90000-120000mg/L). In addition, It also contains a large amount of ammonia nitrogen, residual oil, etc., and is a kind of high-concentration organic wastewater that is extremely difficult to treat. Therefore, the anaerobic fermentation time is very long (usually 25-30 days), the biogas slurry treatment is difficult, and the aerobic anaerobic treatment in the later stage is still as long as nearly 10 days, and the effluent is still difficult to meet the standard, which is manifested in deep color, COD Most of them are above 500mg/L, and further physical and chemical measures such as coagulation and air flotation are needed for advanced treatment. Due to the long processing time and the difficulty in meeting the water standards, the structure is large in size, large in investment and high in operating costs. Therefore, it is particularly important to solve the above-mentioned problems in the biochemical treatment of kitchen waste wastewater.
三、发明内容3. Contents of the invention
本发明提供一种快速处理餐厨垃圾废水的方法，采用生物聚沉氧化工艺，能够快速去除餐厨垃圾废水中的SS，COD，具有处理时间短、去除率高的优势，可显著缩短后期厌氧产沼和生化处理时间，大大提高出水的水质。The invention provides a method for quickly treating kitchen waste wastewater, adopting a biological coagulation oxidation process, which can quickly remove SS and COD in kitchen waste wastewater, has the advantages of short processing time and high removal rate, and can significantly shorten the post-stage annoyance. Oxygen biogas generation and biochemical treatment time greatly improve the water quality of the effluent.
所述的一种快速处理餐厨垃圾废水的方法，是采用生物聚沉氧化工艺，其特征在于利用特异微生物菌群以餐厨垃圾废水为培养基并添加少量营养剂使其产生大量生物絮凝剂，通过吸附桥联作用、电荷中和作用和卷扫作用与废水中的SS发生聚合而沉淀，进一步利用固液分离设备进行固液分离除渣，分离出的泥饼通过发酵后生产有机肥，分离出的清澈废水经过进一步生物氧化处理后实现达标排放。The method for quickly treating kitchen waste wastewater is to adopt a bio-coagulation oxidation process, which is characterized in that the use of specific microbial flora uses kitchen waste wastewater as a medium and adding a small amount of nutrients to produce a large amount of biological flocculants , through adsorption bridging, charge neutralization and volume sweeping, polymerize and precipitate with SS in wastewater, further use solid-liquid separation equipment for solid-liquid separation and slag removal, and the separated mud cake is fermented to produce organic fertilizer. The separated clear wastewater can be discharged up to standard after further biological oxidation treatment.
所述的特异微生物菌群是嗜酸菌Acidiphilium sp.J6(保藏单位：中国微生物菌种保藏管理委员会普通微生物中心，保藏地址：北京市朝阳区大屯路中国科学院微生物研究所，保存编号：CGMCC No.11036，保藏时间：2015年7月2日，分类命名：嗜酸菌Acidiphilium sp.)和克雷伯氏菌Klebsiella sp.F1(保藏单位：中国微生物菌种保藏管理委员会普通微生物中心，保藏地址：北京市朝阳区大屯路中国科学院微生物研究所，保藏时间：2009年4月23日，保存编号：CGMCC No.3032，分类命名：克雷伯氏菌Klebsiella sp.)组成的复合菌，两者的比例为1∶1。The specific microbial flora is acidophilic bacteria Acidiphilium sp.J6 (preservation unit: General Microbiology Center of China Microbiological Culture Collection Management Committee, preservation address: Institute of Microbiology, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing, preservation number: CGMCC No.11036, storage time: July 2, 2015, classification and name: acidophilus Acidiphilium sp.) and Klebsiella sp. Address: Institute of Microbiology, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing, preservation time: April 23, 2009, preservation number: CGMCC No.3032, classification name: complex bacteria composed of Klebsiella sp.), The ratio of the two is 1:1.
所述的一种快速处理餐厨垃圾废水的处理工艺，包括生物聚沉除渣系统和生物氧化系统。所述的生物聚沉除渣系统依次包括调节池、水解酸化池、集泥池、微生物培养池、生物聚沉反应池、固液分离设施。所述的生物氧化系统包括集水池、厌氧产沼池、好氧-厌氧生化池、二沉池。The described treatment process for rapid treatment of kitchen waste wastewater includes a bio-accumulation and slag removal system and a bio-oxidation system. The bio-accumulation and slag removal system sequentially includes a regulating tank, a hydrolysis acidification tank, a sludge collection tank, a microorganism cultivation tank, a bio-coagulation reaction tank, and solid-liquid separation facilities. The biological oxidation system includes a sump, an anaerobic biogas pond, an aerobic-anaerobic biochemical pond, and a secondary sedimentation pond.
在上述生物处理工艺中，废水进入调节池进行调节水量，后进入水解酸化池，起到对高温的餐厨垃圾废水进行降温和自动调节pH的作用。餐厨垃圾废水在水解酸化池停留时间为2～3d，此时，pH上升到6左右，COD去除率在20％左右。随后，将水解酸化池中的浓浆废水泵入集泥池。In the above biological treatment process, the wastewater enters the regulating tank to adjust the water volume, and then enters the hydrolytic acidification tank to cool down the high-temperature kitchen waste wastewater and automatically adjust the pH. The residence time of kitchen waste wastewater in the hydrolytic acidification tank is 2-3 days. At this time, the pH rises to about 6, and the COD removal rate is about 20%. Subsequently, the thick slurry wastewater in the hydrolytic acidification tank is pumped into the sludge collection tank.
将集泥池的浓浆废水泵入生物聚沉反应池，在该生物聚沉反应池中，浓浆废水与微生物菌液在搅拌机的作用下进行充分混合，加入少量微生物营养剂(主要由氮磷钾钙镁铁硫等营养元素及少量有机碳源组成)，采用曝气系统提供微生物所需O2，在微生物菌液作用下浓浆废水中污泥颗粒内部结合水被破坏，理化性质得到改变，提高浓浆废水的脱水性能。浓浆废水在生物聚沉反应池中停留时间在1.0～5.0h，浓浆废水与菌液的体积比例在5∶1～20∶1。The thick slurry wastewater from the sludge collection tank is pumped into the bio-coagulation reaction tank. In the bio-coagulation reaction tank, the thick slurry wastewater and the microbial bacterial liquid are fully mixed under the action of the mixer, and a small amount of microbial nutrients (mainly composed of nitrogen Phosphorus, potassium, calcium, magnesium, iron, sulfur and other nutrients and a small amount of organic carbon source), the aeration system is used to provide O 2 required by microorganisms, under the action of microbial bacteria liquid, the internal bound water of sludge particles in the thick slurry wastewater is destroyed, and the physical and chemical properties are improved. Change to improve the dehydration performance of thick slurry wastewater. The residence time of the thick slurry wastewater in the biological coagulation reaction tank is 1.0-5.0h, and the volume ratio of the thick slurry wastewater to the bacterial solution is 5:1-20:1.
经过生物聚沉反应池后的浓浆废水的脱水性能得到改善，进入固液分离设备，如隔膜厢式压滤机，进行固液分离，SS全部回收变成半干化的泥饼。因其含水率较低，因此，可以直接破碎成粉末状，因其含有丰富的有机物和氮磷等养分，可作为生产有机肥的原材料，固液分离所得清澈的废水进入集水池。此时，清澈的废水SS含量接近于0，COD去除率达到85％以上。The dehydration performance of the thick slurry wastewater after passing through the biocoagulation reaction tank is improved, and it enters solid-liquid separation equipment, such as a diaphragm chamber filter press, for solid-liquid separation, and all SS is recovered and turned into semi-dried mud cake. Because of its low moisture content, it can be directly crushed into powder. Because it is rich in organic matter and nutrients such as nitrogen and phosphorus, it can be used as raw materials for the production of organic fertilizers. The clear wastewater from solid-liquid separation enters the sump. At this time, the SS content of the clear wastewater is close to 0, and the COD removal rate reaches more than 85%.
集水池出口与厌氧产沼池连接，沼气池设计为上流式厌氧污泥床(UASB)，清澈废水在沼气池中持留时间为2～3d，沼气回收净化后，用于发电和供热。沼液进入后续的生化单元。The outlet of the sump is connected to the anaerobic digester. The digester is designed as an upflow anaerobic sludge bed (UASB). The clear wastewater stays in the digester for 2 to 3 days. After the biogas is recovered and purified, it is used for power generation and heat supply. The biogas slurry enters the subsequent biochemical unit.
生化单元由一系列生化池组成，采用A2/O工艺，由1个缺氧池、1个厌氧池和1个好氧池组成，所述的缺氧池和厌氧池内设置潜水搅拌机进行混合，所述的好氧池采用罗茨风机进行供氧。生化单元处理时间2d左右。The biochemical unit is composed of a series of biochemical pools, using the A 2 /O process, consisting of 1 anoxic pool, 1 anaerobic pool and 1 aerobic pool. The anoxic pool and anaerobic pool are equipped with submersible mixers for Mixing, the aerobic pool adopts Roots blower to carry out oxygen supply. The processing time of the biochemical unit is about 2 days.
所述的缺氧池溶解氧浓度为＜0.4mg/L，所述厌氧池溶解氧＜0.2mg/L，所述好氧池溶解氧浓度≥2.0mg/L。The dissolved oxygen concentration in the anoxic pool is <0.4 mg/L, the dissolved oxygen in the anaerobic pool is <0.2 mg/L, and the dissolved oxygen concentration in the aerobic pool is ≥2.0 mg/L.
生化池出来的泥水混合液进入二沉池，进行泥水分离，分离出的水质可进行达标排放，沉淀后污泥部分回流至好氧池，其余的污泥经过浓缩后，进入生物聚沉池进行脱水处理。The mud-water mixture from the biochemical tank enters the secondary sedimentation tank for mud-water separation, and the separated water can be discharged up to standard. After sedimentation, part of the sludge flows back to the aerobic tank, and the rest of the sludge is concentrated and then enters the biological coagulation tank for further processing. Dehydration treatment.
本发明的有益效果是：利用特异微生物菌群产生生物絮凝剂，在1～5h的极短时间内通过吸附桥联作用、电荷中和作用和卷扫作用与餐厨垃圾浓浆废水中的SS发生聚沉，改善其脱水性，经机械固液分离后，几乎100％地去除废水中SS和85％以上COD等污染物，后续只需经过不到7d的生物氧化(包括厌氧产沼与生化处理)处理，可使餐厨垃圾废水达标排放。处理时间仅为常规处理的1/5，因此，可大量节约处理投资和运行成本，具有良好的经济性。The beneficial effects of the present invention are: using the specific microbial flora to produce the biological flocculant, and within a very short time of 1 to 5 hours, through adsorption bridging, charge neutralization and sweeping, the SS in the kitchen garbage thick slurry wastewater Coagulation occurs to improve its dehydration. After mechanical solid-liquid separation, almost 100% of SS and more than 85% of COD and other pollutants in wastewater are removed, and subsequent biological oxidation (including anaerobic biogas production and Biochemical treatment) treatment can make the kitchen waste wastewater discharge up to the standard. The processing time is only 1/5 of conventional processing, therefore, it can save a lot of processing investment and operating costs, and has good economy.
四、附图说明4. Description of drawings
在参照附图阅读了本发明的具体实施方式以后，本领域技术人员将会更清楚地了解本发明的各个方面。本领域技术人员应当理解的是：这些附图仅仅用于配合具体实施方式说明本发明的技术方案，而并非意在对本发明的保护范围构成限制。其中，Those skilled in the art will understand various aspects of the present invention more clearly after reading the detailed description of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that: these drawings are only used to describe the technical solutions of the present invention in conjunction with specific implementation methods, and are not intended to limit the protection scope of the present invention. in,
图1为本发明一种快速处理餐厨垃圾废水的生物聚沉氧化法工艺流程图。Fig. 1 is a process flow diagram of a biological coagulation oxidation method for rapidly treating kitchen waste wastewater according to the present invention.
图2为本发明一种快速处理餐厨垃圾废水生物聚沉氧化法的一个实施例的工艺流程图。Fig. 2 is a process flow chart of an embodiment of a bioaccumulation oxidation method for rapidly treating kitchen waste wastewater according to the present invention.
五、具体实施方式5. Specific implementation
下面结合附图1对本发明作进一步的详细描述。The present invention will be described in further detail below in conjunction with accompanying drawing 1 .
一种快速处理餐厨垃圾废水的生物聚沉氧化工艺，包括生物聚沉除渣系统和生物氧化系统。生物聚沉除渣系统依次包括调节池、水解酸化池、集泥池、微生物培养池、生物聚沉反应池、生物聚沉专用除渣机。所述的生物氧化系统包括集水池、厌氧产沼池、好氧-厌氧生化池、二沉池。The invention discloses a biological coagulation oxidation process for rapidly treating kitchen garbage wastewater, comprising a bio-coagulation slag removal system and a biological oxidation system. The bio-coagulation and slag removal system sequentially includes a regulating tank, a hydrolysis acidification tank, a sludge collection tank, a microbial cultivation tank, a bio-coagulation reaction tank, and a special slag removal machine for bio-coagulation. The biological oxidation system includes a sump, an anaerobic biogas pond, an aerobic-anaerobic biochemical pond, and a secondary sedimentation pond.
餐厨垃圾废水各污染物浓度如下：COD 108000mg/L、SS 97500mg/L、氨氮300mg/L。The concentration of each pollutant in the kitchen waste wastewater is as follows: COD 108000mg/L, SS 97500mg/L, ammonia nitrogen 300mg/L.
上述生物处理工艺中，三相分离后餐厨垃圾废水10m3进入调节池进行调节水质水量，然后进入有效容积30m3水解酸化池。餐厨垃圾废水在水解酸化池停留时间为2.5d，经过水解酸化后，pH上升到6.05，COD降低到81200mg/L，温度降低到常温(28℃)。随后，将水解酸化池中的浓浆废水泵入集泥池。In the above biological treatment process, after the three -phase separation, 10m3 of kitchen waste wastewater enters the regulating tank to adjust the water quality and quantity, and then enters the effective volume of 30m3 to hydrolyze and acidify the tank. The residence time of kitchen waste wastewater in the hydrolytic acidification tank is 2.5 days. After hydrolysis and acidification, the pH rises to 6.05, the COD decreases to 81200mg/L, and the temperature drops to normal temperature (28°C). Subsequently, the thick slurry wastewater in the hydrolytic acidification tank is pumped into the sludge collection tank.
集泥池中10m3经过水解酸化后的浓浆废水进入池容为15m3的生物聚沉反应池，在该生物聚沉反应池中，按浓浆废水体积与菌液体积比10∶1添加菌液1m3，浓浆废水与微生物菌液在搅拌机的作用下进行充分混合，加入占浓浆废水体积0.5％的微生物营养剂(主要由氮磷钾钙镁铁硫等营养元素及少量有机碳源组成)50kg，采用曝气系统提供微生物所需O2，在微生物菌液作用下浓浆废水颗粒物(即污泥)内部结合水被破坏，理化性质改变，提高了脱水性能，浓浆废水在生物聚沉反应池中停留时间为3.0h。10m3 thick slurry wastewater after hydrolysis and acidification in the sludge collection tank enters the bio-coagulation reaction tank with a pool capacity of 15m3 . In the bio-coagulation reaction tank, add Bacteria liquid 1m 3 , thick pulp wastewater and microbial bacterial liquid are fully mixed under the action of a mixer, and microbial nutrients (mainly composed of nitrogen, phosphorus, potassium, calcium, magnesium, iron, sulfur and other nutrients and a small amount of organic carbon) are added to account for 0.5% of the thick slurry wastewater volume. Source composition) 50kg, the aeration system is used to provide the O 2 required by microorganisms, under the action of microbial bacteria liquid, the internal bound water of the thick slurry wastewater particles (ie sludge) is destroyed, the physical and chemical properties are changed, and the dehydration performance is improved. The residence time in the bioaccumulation reaction tank is 3.0h.
经过生物聚沉反应池后的浓浆废水进入生物聚沉专用厢式隔膜压滤机进行固液分离，其中的固体被压滤成半干化的泥饼，泥饼的含水率为58％，直接破碎后，可作为生产有机肥的原材料，固液分离所得清澈废水进入集水池。此时，清澈的废水SS含量接近为0，COD浓度为15600mg/L，较之处理前原水，COD去除率达到85.6％。The thick slurry wastewater after passing through the bio-coagulation reaction tank enters the special box-type diaphragm filter press for bio-coagulation for solid-liquid separation, and the solids in it are filtered into semi-dried mud cakes, and the moisture content of the mud cakes is 58%. After direct crushing, it can be used as a raw material for the production of organic fertilizers, and the clear wastewater obtained from solid-liquid separation enters the sump. At this time, the SS content of the clear wastewater is close to 0, and the COD concentration is 15600mg/L. Compared with the raw water before treatment, the COD removal rate reaches 85.6%.
集水池出水口与上流式厌氧污泥床(UASB)的进水口相连，清澈废水在沼气池中持留时间为2d，沼气回收净化后，用于发电和供热，沼液进入后续的生化单元。此时，沼液COD仅为1820mg/L，氨氮216mg/L。The outlet of the sump is connected to the inlet of the upflow anaerobic sludge bed (UASB). The clear waste water stays in the biogas digester for 2 days. After the biogas is recovered and purified, it is used for power generation and heat supply, and the biogas slurry enters the subsequent biochemical unit . At this time, the COD of the biogas slurry is only 1820mg/L, and the ammonia nitrogen is 216mg/L.
生化单元由一系列生化池组成，采用A2/O工艺，由1个有效容积为3m3缺氧池、1个3m3厌氧池和1个15m3的好氧池组成。好氧池混合液部分回流至缺氧池，实现硝化反硝化脱氮，在生化单元中水力持留时间为共2d，其中好氧池的水力持留时间为1.5d。缺氧池和厌氧池内设置潜水搅拌机进行混合，好氧池采用罗茨风机进行供氧，保证溶解氧浓度不低于2mg/L。The biochemical unit consists of a series of biochemical pools, using A 2 /O process, consisting of an anoxic pool with an effective volume of 3m 3 , an anaerobic pool with an effective volume of 3m 3 and an aerobic pool with an effective volume of 3m 3 . Part of the mixed liquid in the aerobic tank is returned to the anoxic tank to realize nitrification and denitrification. The hydraulic retention time in the biochemical unit is 2 days in total, and the hydraulic retention time of the aerobic tank is 1.5 days. The anoxic pool and the anaerobic pool are equipped with a submersible mixer for mixing, and the aerobic pool uses a Roots blower for oxygen supply to ensure that the dissolved oxygen concentration is not lower than 2mg/L.
好氧池泥水混合液进入二沉池进行沉淀出水，沉淀时间为4h。经排放口排放上清液，上清液中氨氮含量为4.7mg/L、SS为28mg/L、COD为58mg/L、总磷0.2mg/L。The mud-water mixture in the aerobic tank enters the secondary settling tank for precipitation and effluent, and the settling time is 4 hours. The supernatant is discharged through the discharge port. The content of ammonia nitrogen in the supernatant is 4.7mg/L, SS is 28mg/L, COD is 58mg/L, and total phosphorus is 0.2mg/L.
将沉淀污泥回流至生物聚沉反应池进行下一批的处理。The sedimentation sludge is returned to the biological coagulation reaction tank for the next batch of treatment.
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