按处理方法，中水处理工艺一般分为 3 种类型：
1 ．物理处理法：
膜滤法，适用于水质变化大的情况。
采用这种流程的特点是：装置紧凑，容易操作，以及受负荷变动的影响小。
膜滤法是在外力的作用下，被分离的溶液以一定的流速沿着滤膜表面流动，溶液中溶剂和低分子量物质、无机离子从高压侧透过滤膜进入低压侧，并作为滤液而排出；而溶液中高分子物质、胶体微粒及微生物等被超滤膜截留，溶液被浓缩并以浓缩形式排出。 
2 ．物理化学法：
适用于污水水质变化较大的情况。一般采用的方法有：砂滤、活性炭吸附、浮选、混凝沉淀等。这种流程的特点是：采用中空纤维超滤器进行处理，技术先进，结构紧凑，占地少，系统间歇运行，管理简单。
3 ．生物处理法
适用于有机物含量较高的污水。一般采用活性污泥法、接触氧化法（如图所示）、生物转盘等生物处理方法。或是单独使用，或是几种生物处理方法组合使用，如接触氧化 + 生物滤池；生物滤池 + 活性炭吸附；转盘十砂滤等流程。这种流程具有适应水力负荷变动能力强、产生污泥量少、维护管理容易等优点。
Water treatment process
According to the processing method, sewage treatment process is generally divided into 3 types:
one:Physical treatment:
Membrane filtration method, suitable for big change of water quality situation.The characteristics of using this process is: the device is compact, easy to operate, and the influence of load change little.Membrane filtration method is under the action of external force, the solution is separated with a certain velocity along membrane surface flow, solvent and low molecular weight substances,inorganic ions in the solution from the high voltage side through the membrane into the low pressure side, and as the filtrate and the discharge; while the solution polymer material, colloidal particles and microorganisms by ultrafiltration the solution was concentrated, and in the from of a concentrate discharge.
two: Physical Chemistry method:
Applicable to the sewage water quality changes in the larger situation. Methods generally used are:sand filtration, activated carbon adsorption, flotation, coagulation precipitation. The characteristics of this process is: using hollow fiber ultrafiltration device for processing, advanced technology,compact structure, less land occupation, system of intermittent operation, simple management.
there: biological treatment method
Applicable for high organic content of sewage. The general use of activated sludge process,contact oxidation (as sh, own), rotating biological contactor and other biological treatment method.Or is used alone, or a combination of several methods such as the use of biological treatment,contact oxidation and biological aerated filter; biological aerated filter + activated carbon adsorption; turntable ten sand filtration process. This process has to adapt to changes in hydraulicload ability strong, produce less amount of sludge, the advantages of easy maintenancemanagement.
