摘要
本设计是对某乡镇污水处理厂的设计。其日处理量为1000t/d，进水水质为：COD 290mg/L、BOD 155mg/L、SS 90mg/L、NH2-N 27mg/L、TP 4mg/L、pH 6~7。处理后的水质要求为：CODle;50mg/L 、BODle;10mg/L、SS le;10mg/L、NH2-Nle;5mg/L、TPle;0.5mg/L、PH 6~7。
根据设计要求，考虑到该废水处理工程中进水的含氮量均量偏高，在去除BOD和SS的同时，还需要进行脱氮处理，所以采用水处理工艺中的A2/O工艺。A2/O工艺由于不同环境条件，不同功能的微生物群落的有机配合，加之厌氧、缺氧条件下，部分不可生物降解的有机物能被开环或者断链，使N、P、有机碳被同时去除，并提高对不可降解有机物的去除效果。其可以同时完成有机物的去除，硝化脱氮、磷的过量摄取而被去除等功能，脱氮的前提是NH2-N应完全硝化，好氧池能完成这一功能，缺氧池则完成脱氮功能。厌氧池和好氧池联合完成除磷功能。
该工艺还具备高效、节能等特点，且耐冲击负荷较高，出水水质好。所以，更具有广泛的适应性，完全适合本设计的实际要求。该工艺的主要建筑包括格栅、污水泵房、平流沉砂池、好氧池、厌氧池、二沉池、接触消毒池、浓缩池、污泥脱水机房。
设计中采用A2/O为主体的工艺，其流程相对简单，省去了污泥消化系统，节省了基建投资和运行费用，并且处理污水运行稳定，易于管理，处理后的水达到国家规定的一级A标准排放标准，允许直接排入河流和湖泊，真正充分考虑了环境效益与经济效益之间的关系，尽量最大限度使两者协调。
关键字： 格栅、 经济效益、 A2/O、 好氧池、 厌氧池、 二沉池
Abstract
This design is a town sewage treatment plant design. The daily treatment capacity is 1000t / D, and the influent water quality is cod 290mg / L, BOD 155mg / L, SS 90mg / L, nh2-n 27mg / L, TP 4mg / L, pH 6-7. After treatment, the water quality requirements are: cod le; 50mg / L, BOD le; 10mg / L, SS le; 10mg / L, nh2-n le; 5mg / L, TP le; 0.5mg/l, pH 6 ~ 7.
According to the design requirements, considering that the average nitrogen content of the influent water in the wastewater treatment project is high, while removing BOD and SS, denitrification is also required, so A2 /O process in the water treatment process is adopted. Due to different environmental conditions, organic coordination of microbial communities with different functions, and anaerobic and anoxic conditions, part of the non biodegradable organics can be broken or broken, so that N, P and organic carbon can be removed at the same time, and the removal effect of non degradable organics can be improved. It can remove organic matter, nitrification, denitrification, excessive uptake of phosphorus and other functions at the same time. The premise of denitrification is that nh2-n should be completely nitrated, aerobic tank can complete this function, and anoxic tank can complete the denitrification function. The anaerobic tank and aerobic tank jointly complete the phosphorus removal function.
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