毕业设计（论文）摘要随着我国经济的不断发展，人们对于环境的要求也越来越高。尤其是近年来城镇的快速发展，进行城镇的生活污水处理是建设美好环境的必要步骤 。本次设计是针对 20000m3/d 的低浓度城镇污水进行设计，通过分析给定的污水进水水质以及出水要求，设计合理地污水处理工艺，完成工艺的平面布置图、高程图绘制以及主要构筑物的选型计算和绘制，同时对设计的工艺进行工程概预算以及效益分析。本次设计的出水标准是一级 A 出水标准，通过水质分析以及工艺比较，本次设计选择“预处理—细格栅—沉砂池—A2/O—絮凝池—平流沉淀池—滤布滤池—接触消毒池”的污水处理工艺，并对每一个部分进行了详细的设备或工艺比选以及他们的设计计算和设备选型，污泥采用浓缩脱水一体机进行处理。最终经过处理后的污水可以进行回用，可以用来满足景区用水、道路的清洁用水等。本次设计可以加深对于污水处理工艺的了解，并通过直接参与和回忆所学的知识掌握污水处理厂的初步设计的相关知识，为以后从事专业工作打下基础。关键词：低浓度污水处理 A2/O 生物处理第 1 页毕业设计（论文）AbstractWith the continuous development of China's economy, people have higher and higher requirements on the environment. Especially in recent years, the rapid development of cities and towns, urban sewage treatment is a necessary step to build a better environment.This design is for 20000 m3 / d the low concentration of urban sewage to carry on the design, through the analysis of a given sewage water quality and water requirements, design reasonable wastewater treatment process, the complete process of floor plan, elevation drawing and main structure of the type selection calculation and drawing, engineering budget and benefit for the design of process analysis.The design of the effluent standard is the level of A water, by comparing with water quality analysis and process, the design choices "pretreatment, fine screen, grit chamber, A2 / O - flocculation pool - advection sedimentation tank, filter cloth filter, contact d...
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