毕业设计 cass工艺处理生活污水辽工大

中文题目：阜新市5万m3·d﹣1生活污水处理CASS工艺设计 外文题目：THE FUXIN CITY 50000m3•d1SEWAGE TREATMENT PLANT CASS PROCESS DESIGN

毕业设计（论文）共 页 图纸共 张 完成日期 2013年 6月 答辩日期 2013年 7月 II

摘要 本设计主要工艺是使用CASS技术处理生活污水。循环活性污泥法CASS工艺是一种将变容积活性污泥法和生物选择器原理有机的结合起来，具有同步脱氮除磷的特点，并以序批曝气-非曝气方式运行的间歇活性污泥处理工艺。本设计在总体布局上简单有序，在进水口设置格栅，主要除去污水中较大的漂浮物和悬浮物；接下来设置两座沉砂池，主要除去污水中细小的无机颗粒；还设置了滤池，处理方法除去污水中的悬浮物；并且本设计设置CASS工艺作为除去污水中有机物的生物处理工艺。CASS池的前部是生物选择区，即预反应区，后部为主反应区，其主反应区后装了可升降自动撇水装置。整个工艺的曝气、沉淀、排水在同一池子内周期循环运行，省去了常规活性污泥法的二沉池和污泥回流系统;同时可连续进水，间断排水。 关键词：CASS工艺;处理生活污水;连续进水;间断排水 III

Abstract CASS cycle activated sludge short is developed on the basis of the SBR process. That is a biological selector increase in SBR pool water side, to achieve a continuous flow, intermittent drainage. The main purpose of the bio-selector is to enable the system to choose a flocculation bacterium, its volume to about 10% of the entire pond. Biological selection process to follow the accumulation of activated sludge matrix -reproduction theory, so that the activated sludge in the adsorption process wherein experiencing a high load, then in the primary reaction zone through a lower load matrix degradation stage, in order to complete the entire the whole process of matrix degradation and sludge regeneration. The process as early as applications in foreign countries, in order to better its introduction digestion development of a new sewage treatment process suitable for China's national conditions, the General Armament Department, Engineering and Research Institute Environmental Protection Center in 1994 in the laboratory of the entire system simulation experiment, investigate the effect of nitrogen and phosphorus removal mechanism and characteristics of the CASS process at room temperature sewage, cold domestic sewage, pharmaceutical and chemical industrial wastewater treatment process, valuable design parameters and process operation guiding experience. CASS front of the pool area of biological selection procreation zone, the rear of the main reaction zone, the water can be raised and lowered automatically write device is installed in the main reaction zone. The entire process of aeration sedimentation drainage run in the same pond cycle, eliminating the need for conventional activated sludge secondary sedimentation tank and sludge return system; continuous water, intermittent drainage. Keywords: CASS process; cycle activated sludge; continuous water; intermittent drainage IV

前言 从总体上看，我国是一个水资源贫乏的国家，人均占有水资源量只有世界平均水平的1/4，在世界银行连续统计的153个国家中居世界第八十八位。按目前的正常需要和不超过地下水，全国年缺水总量约为300亿～到400亿立方米。同时水资源在时间和空间上分布不平衡。有限的水资源总量中60％～ 70％是难以控制和利用的洪水，黄淮海流域入口，粮食产量和国内生产总值运站全国的2/3左右，但其多年平均水资源量站全国的7.2％。专家预计，2030年我国跟口将接近16亿，城市化水平将达52％，在充分考虑节水病扣除必须的生态环境需水后，全国预计的用水量已经接近河里利用水量的上限，从一定意义上说，水资源短缺已经成为国民经济和社会发展的主要因素。 水体污染包括地表水污染和地下水污染两部分，生产过程中生产的工业废水，工业垃圾、工业废气、生活污水和生活垃圾都能通过不同渗透方式造成水资源的污染。长期以来，用于工业生产污水直接外派而引起的环境事业屡见不鲜，它给人类生产、生活带来极坏的影响，因此，应当对生产、生活中的排放的废水加以控制 V

目录 摘要 ................................................................................................................................................. II Abstract ........................................................................................................................................... III 前言 ................................................................................................................................................ IV 1 概论 .............................................................................................................................................. 1 1.1 设计任务 ............................................................................................................................ 1 1.2设计要求 ............................................................................................................................ 1 1.3 设计基础资料 ................................................................................................................... 1 1.3.1 项目概况 ............................................................................................................... 1 1.3.2 水质情况 ............................................................................................................... 1 1.4 污水的主要来源 ............................................................................................................... 2 1.5 环境概况 ........................................................................................................................... 2 1.6 污水处理厂厂址 ............................................................................................................... 2 2. 污水处理系统 ............................................................................................................................. 3 2. 1处理程度计算 .................................................................................................................. 3 2.1.1 CODcr的处理程度 .................................................................................................. 3 2.1.2 溶解性BOD5的处理程度 ...................................................................................... 3 2.1.3 SS的处理程度 ...................................................................................................... 3 2.1.4 NH3-N的处理程度 ................................................................................................. 4 2.1.5 TP的处理程度 ...................................................................................................... 4 2.2 设计计算 ........................................................................................................................... 5 2.2 泵站的设计计算 ............................................................................................................... 8 2.3集水池 .............................................................................................................................. 11 2.4细格栅设计计算 .............................................................................................................. 11 2.5 沉砂池的选择计算 ......................................................................................................... 14 2.5.1 沉砂池的选择 ..................................................................................................... 14 2.5.2 沉砂池设计计算一般规定 ................................................................................. 14 2.5.3 设计参数 ............................................................................................................. 15 2.5.4 设计计算 ............................................................................................................. 15 2.6 配水井的设计 .................................................................................................................. 16 2.6.1 设计要求 ............................................................................................................... 16 2.6.2 设计计算 ............................................................................................................... 17 2.7 CASS池的设计计算 ........................................................................................................ 18 2.7.1 基本设计参数 ..................................................................................................... 18 2.7.2 曝气时间TA ........................................................................................................ 19 2.7.3 沉淀时间TS ........................................................................................................ 19 2.7.4 排水时间TD ........................................................................................................ 20 2.7.5 周期数的确定 ..................................................................................................... 20 2.7.6 进水时间TF ........................................................................................................ 21