城市生活污水处理CASS工艺.docxVIP

摘要随着城市化和工业化进程的加快，生活污水污染日趋严重，制约了社会经济的可持续发展。本文主要对某小型城市生活污水中的COD、BOD、SS进行处理设计。目前，其处理方法有很多，主要有物化处理、化学处理 、生化处理以及多种方法的组合处理等，各种处理方法具有各自的优势及不足，本文较详细的介绍了常见的几种生化处理工艺，比较他们各自的优缺点，并根据该项目的实际情况选择合适的处理工艺。最终选择CASS工艺来处理该城市生活污水，并对其工艺和主要设备进行了设计。处理后，达到国家污水综合排放一级B标准。关键词: 城市生活污水 污水处理工艺 CASS 曝气沉砂池 BOD AbstractWith theacceleration of the process of urbanization and industrialization, sewage pollution is worsening, the constraints of sustainable socio-economic development. In this paper, a small urban sewage of COD, BOD, SS processing design. At present, there are many treatment methods, the main physico-chemical treatment, chemical treatment, biological treatment, as well as a combination of treatment of a variety of methods, various approaches have their respective advantages and shortcomings, this paper more detailed description of several common biochemical processing process to compare their respective advantages and disadvantages, and in accordance with the actual situation of the project to select the appropriate treatment process. Final choice of the CASS process to handle the sewage of the city, and its process and equipment design. Treatment to achieve a B standard of the national wastewater discharge.Keywords:Urban sewage Wastewater treatment process CASS Aerated Grit BOD 目录摘要IAbstractI一、绪论- 1 -1.1水环境- 1 -1.2水资源概述- 1 -1.3水资源的重要性- 2 -1.4城市生活污水的特点- 3 -1.3污水处理现状- 3 -1.3.1国外污水处理现状- 4 -1.3.2 国内污水处理现状- 5 -二、处理方案的确定- 6 -2.1 污水工艺简介- 6 -2.2 处理工艺的优选- 8 -2.2.1 常规活性污泥法和氧化沟、SBR工艺的比较- 8 -2.2.2 氧化沟、SBR工艺的比较- 8 -2.2.3 最终工艺的确定- 9 -2.3 CASS工艺- 10 -2.3.1概述- 10 -2.3.2 CASS工艺的优点- 11 -2.3.3与其他工艺对比- 13 -2.4工艺流程- 14 -三、工艺设计与计算- 15 -3.1集水井的设计- 15 -3.2格栅的设计与计算- 16 -3.2.1泵前粗格栅的设计与计算- 16 -3.2.2泵后细格栅的设计与计算- 19 -3.3提升泵站- 22 -3.3.1设计参数- 22 -3.3.2提升泵房设计计算- 22 -3.4曝气沉砂池的设计与计算- 23 -3.4.1曝气沉砂池- 23 -3.4.2曝气沉砂池的设计与计算- 24 -3.4.3设计计算- 24 -3.4.4吸砂泵房与砂水分离器- 26 -3.4.5鼓风机房- 26 -3.5 CASS池的设计与计算- 26 -3.5.1CASS工艺运行过程- 27 -3.5.2 BOD-污泥负荷- 28 -3.5.3 曝气时间- 28 -3.5.4 沉淀时间- 28 -3.5.5运行周期- 29 -3.5.6曝气池容积- 29 -3.5.7 复核出