答：生活污水处理的六个步骤

 　污水处理流程1：废水**历经格栅、筛网后流至絮凝沉淀池,为了更好地使处理效果好,在絮凝沉淀池中加入混凝剂,使废水中悬浮物治理效果更好,混凝加药也起到调节废水的作用.絮凝沉淀后的废水流入预曝气调节池中。

　　污水处理流程2：曝气调节池中通入空气,起到预曝气调节的作用.调节均匀的废水用泵**到一级浮动填料生化池里。

　　污水处理流程3：生化池里组装充氧高效率很高的曝气头,并装入浮动填料,实践证明该项技术对COD和BOD有较高的除去高效率。一级浮动填料生化池里废水自流入二级浮动填料生化池,二池采用方法相同。

　　污水处理流程4：二级浮动填料生化池水自流入斜板沉淀池中.池里加入聚丙烯蜂窝斜管,可大幅提高沉降高效率,此外水力负载高,停留时间短,占地总面积小。

　　污水处理流程5：混凝沉淀池与斜板沉淀池沉淀污泥排入污泥浓缩池中,然后经污泥脱水机械脱水。

　　污水处理流程6：斜板沉淀池排出的水流入清水池中,经检测后外排。

　　污水处理按照处理程度来分可分为一级处理、二级处理和三级处理。

　　①一级处理主要是除去污水中呈悬浮状态的固体物质，常用物理法。

　　②二级处理的主要任务是大幅度除去污水中的**物，BOD去除率为80%～90%。

　　③三级处理的目的是更进一步除去某种特殊的污染物质，如除氟、除磷等，归属于深层处理，常用化学法。

　污水处理方法：

　　1、按作用分：污水处理按照其作用可分为物理法、生物法和化学法三种。

　　(1)物理法：主要利用物理作用分离污水中的非溶解性物质，在处理过程中不改变化学性质。常用的有重力分离、离心分离、反渗透、气浮等。物理法处理构筑物较简单、经济，用于村镇水体容量大、自净能力强、污水处理程度要求不高的情况。

　　(2)生物法：利用微生物的新陈代谢功能，将污水中呈溶解或胶体状态的**物分解氧化为稳定的无机物质，使污水得到净化。常用的有活性污泥法和生物膜法。生物法处理程度比物理法要高。

　　(3)化学法：是利用化学反应作用来处理或回收污水的溶解物质或胶体物质的方法，多用于工业废水。常用的有混凝法、中和法、氧化还原法、离子交换法等。化学处理法处理效果好、费用高，多用作生化处理后的出水，作进一步的处理，提高出水水质。

　　2、按处理程度分：污水处理按照处理程度来分可分为一级处理、二级处理和三级处理。

　　(1)一级处理主要是去除污水中呈悬浮状态的固体物质，常用物理法。

　　(2)二级处理的主要任务是大幅度去除污水中呈胶体和溶解状态的**物，BOD去除率为80%～90%。

　　(3)三级处理的目的是进一步去除某种特殊的污染物质，如除氟、除磷等，属于深度处理，常用化学法。

　　参考资料来源：百度百科--污水处理

　　污水处理的集中方法：

　　**种可直接利用的污水，家庭就可以直接处理了，如：淘米水，洗菜的水、洗衣服的水等生活用水，淘米水、洗菜水等可以直接用了浇花、浇菜。洗衣服的水可以用来冲厕所。

　　第二种不能直接利用的，就有一下几自方法：

　　1) 物理法：利用物理作用处理、分离和回收废水中的污染物。例如沉淀法(重力分离法)除去水中相对密度大于1的悬浮物; 过滤法(滤网 沙层 活性碳)可除去水中的悬浮物;蒸发法用于浓缩废水中不挥发性和可溶性物质，另外还有离心分离法、汽浮(浮选)法、 高梯度磁分离法等。

　　2)化学法：利用化学反应或物理化学作用处理回收可溶性废物或胶状物质。例如中和法用于中和酸性或碱性废水;萃取法利用可溶性废物在两相作用中溶解度不同的“分配”，回收酚类和重金属等;氧化还原法用来除去废水中还原性或氧化性污染物，杀灭天然水体中的病原菌。此外还有混凝法和化学沉淀法等。

　　3) 物理化学法：吸附法、离子交换法、萃取法、膜析法、蒸发法。

　　4)生物法：利用微生物的生化作用处理废水中的**污染物。例如，生物过滤法和活性污泥法来处理生活污水或**生产废水，使**物转化降解成无机盐而得到净化。还有生物膜法、生物塘法。

　　5) 污泥土地处理法：用于**质处理。污水灌溉，慢速下渗，快速下渗就要通过污水处理厂进行处理，然后在循环使用，用来冲厕所等用。

　　Answer: six steps of domestic sewage treatment

　　Sewage treatment process 1: the wastewater flows to the flocculation sedimentation tank after passing through the grid and screen first. In order to make the treatment effect better, coagulants are added to the flocculation sedimentation tank to make the treatment effect of suspended solids in the wastewater better. Coagulant dosing also plays a role in regulating the wastewater The wastewater after flocculation and sedimentation flows into the pre aeration regulating tank.

　　Sewage treatment process 2: air is introduced into the aeration regulating tank to play the role of pre aeration regulation The evenly regulated wastewater is pumped into the primary floating filler biochemical tank.

　　Sewage treatment process 3: the aeration head with high oxygenation efficiency is assembled in the biochemical tank and loaded with floating filler. Practice has proved that this technology has high removal efficiency for COD and BOD. The wastewater in the primary floating filler biochemical tank flows into the secondary floating filler biochemical tank by itself, and the methods used in the secondary tank are the same.

　　Sewage treatment process 4: the water of the secondary floating filler biochemical tank flows into the inclined plate sedimentation tank by itself Adding polypropylene honeycomb inclined pipe into the pool can greatly improve the sedimentation efficiency. In addition, it has high hydraulic load, short residence time and small total area.

　　Sewage treatment process 5: the sludge precipitated in the coagulation sedimentation tank and inclined plate sedimentation tank is discharged into the sludge thickener, and then dewatered by the sludge dewatering machine.

　　Sewage treatment process 6: the water discharged from the inclined plate sedimentation tank flows into the clean water tank and is discharged after detection.

　　Sewage treatment can be divided into primary treatment, secondary treatment and tertiary treatment according to the degree of treatment.

　　① The primary treatment is mainly to remove the suspended solid substances in the sewage, which is commonly used by physical methods.

　　② The main task of the secondary treatment is to greatly remove the organic matter in the sewage, and the BOD removal rate is 80% - 90%.

　　③ The purpose of tertiary treatment is to further remove some special pollutants, such as fluoride and phosphorus removal. It belongs to deep treatment and is commonly used by chemical methods.

　　Treatment method:

　　1. By function: according to its function, sewage treatment can be divided into physical method, biological method and chemical method.

　　(1) Physical method: it mainly uses physical action to separate insoluble substances in sewage, and does not change chemical properties during treatment. Commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation, etc. Physical treatment of structures is relatively simple and economical. It is used in villages and towns with large water capacity, strong self purification capacity and low requirements for sewage treatment.

　　(2) Biological method: using the metabolic function of microorganisms, decompose and oxidize the dissolved or colloidal organic matter in the sewage into stable inorganic substances, so that the sewage can be purified. Activated sludge process and biofilm process are commonly used. The treatment degree of biological method is higher than that of physical method.

　　(3) Chemical method: it is a method that uses chemical reaction to treat or recover dissolved substances or colloidal substances in sewage, which is mostly used in industrial wastewater. Commonly used are coagulation method, Zhonghe method, oxidation-reduction method, ion exchange method, etc. The chemical treatment method has good treatment effect and high cost. It is mostly used as the effluent after biochemical treatment for further treatment to improve the effluent quality.

　　2. According to the degree of treatment: sewage treatment can be divided into primary treatment, secondary treatment and tertiary treatment according to the degree of treatment.

　　(1) The primary treatment is mainly to remove the suspended solid substances in the sewage, which is commonly used by physical methods.

　　(2) The main task of the secondary treatment is to greatly remove the colloidal and dissolved organic matter in the sewage, and the BOD removal rate is 80% - 90%.

　　(3) The purpose of tertiary treatment is to further remove some special pollutants, such as fluoride and phosphorus removal. It belongs to advanced treatment, and chemical methods are commonly used.

　　Reference source: Baidu Encyclopedia - sewage treatment

　　Centralized method of sewage treatment:

　　The first kind of sewage that can be directly used can be directly treated by families, such as rice washing water, vegetable washing water, clothes washing water and other domestic water. Rice washing water and vegetable washing water can be directly used to water flowers and vegetables. The water for washing clothes can be used to flush the toilet.

　　The second method that cannot be directly used is the following:

　　1) Physical method: use physical action to treat, separate and recover pollutants in wastewater. For example, sedimentation method (gravity separation method) removes suspended solids with a relative density greater than 1 in water; Filtration method (activated carbon in filter screen sand layer) can remove suspended solids in water; Evaporation method is used to concentrate nonvolatile and soluble substances in wastewater. In addition, centrifugal separation method, steam flotation (flotation) method, high gradient magnetic separation method, etc.

　　2) Chemical method: use chemical reaction or physical and chemical action to treat and recover soluble waste or colloidal substances. For example, neutralization method is used to neutralize acidic or alkaline wastewater; Extraction method uses the "distribution" of different solubility of soluble waste in two-phase interaction to recover phenols and heavy metals; Oxidation reduction method is used to remove reducing or oxidizing pollutants in wastewater and kill pathogenic bacteria in natural water. In addition, there are coagulation method and chemical precipitation method.

　　3) Physical and chemical methods: adsorption method, ion exchange method, extraction method, membrane analysis method, evaporation method.

　　4) Biological method: use the biochemical action of microorganisms to treat organic pollutants in wastewater. For example, biological filtration method and activated sludge method are used to treat domestic sewage or organic production wastewater, so that organic matter can be transformed and degraded into inorganic salts and purified. There are also biofilm method and biological pond method.

　　5) Sludge land treatment method: used for organic matter treatment. Sewage irrigation, slow infiltration, fast infiltration is to be treated through the sewage treatment plant, and then recycled for toilet flushing, etc.