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摘 要长江是我国最长水流量最多经过地区最多的的一条河流，长江有着全国35%的水量，长江流经过的区域大小约有全国的1/5大，此外我国有1/3的人口分布在长江沿岸。所以保护长江水资源和沿岸的生态环境非常重要。
目前长江的水环境处于“亚健康”状态。长江沿岸的经济开发存在着一些不合理的地方，水资源的处置也存在着某些不合理的地方。今天，长江的水环境存在着生态环境问题，长江沿岸的废水排放一直是关系长江水质好坏的重要因素，这些废水中绝大多数是达标排放的，但还是一些是未达标排放的，这样就影响了长江的水质。目前长江沿岸的废水排放量在以每年3%的速度增长。长江沿岸城镇的水环境都或多或少的存在着水体污染问题，一些地区的水环境质量甚至在Ⅲ类水之下，长江沿岸的湖泊也有水体污染问题，一些湖泊富营养化问题严重。保护长江流域的水环境刻不容缓，在经济发展的同时必须考虑到环境的保护。lf0077
本方案废水设计为长江上游某小镇污水处理。该小镇主要以居民住宅区为主，即产生的污水主要是生活污水。该小镇设计人口30万，设计流量Q=5×104m3/d，在本方案中，对污水的处理采用CASS工艺。
关键词：污水处理；脱氮除磷；CASS工艺
Abstract
The Yangtze River is China's longest water flow most after area up to the river, the Yangtze River has a 35 percent of the country's water, the Yangtze River flows through the size of the area about one fifth of the country, in addition to China, one third of the population distribution on the banks of the Yangtze river. So it is very important to protect the ecological environment of the Yangtze River water resources and the coastal environment.
At present, the water environment of the Yangtze River is in "sub healthy" [1] state. There are some unreasonable places in the economic development along the Yangtze River, and there are some unreasonable places for the disposal of water resources. Today, the water environment of the Yangtze River has ecological and environmental problems, along the Yangtze River wastewater discharge has been an important factor in the relationship between the Yangtze River water quality, the waste water in the vast majority of discharge of, but still some did not meet emissions. This will affect the water quality of the Yangtze river. The emissions of wastewater along the Yangtze River are growing at an annual rate of 3%.Cities and towns along the Yangtze River water environment are more or less there is a problem of water pollution, water quality of the environment in some areas even under the class III water, along the Yangtze River of the lake also water pollution problems, some lakes eutrophication problem is serious. It is urgent to protect the water environment of the Yangtze River Basin, while economic development must The design of this scheme is a small town sewage treatment in the upper reaches of the Yangtze River. The main residential areas of the main residential areas, that is the main sewage is living sewage. The design population of the town is 300000, the design flow is Q=5×104m3/d, and the wastewater treatment is treated by CASS technology in this scheme.
Keyword: Sewage treatment; Nitrogen and phosphorus removal; CASS process
目 录
第一章 绪论1
1.1 工程概况1
1.2 设计依据1
1.3 设计原则2
1.4 设计范围2
1.5 设计参数2
第二章 设计方案选择3
2.1 城镇污水处理概论3
2.2 废水可生化性分析3
2.3 工艺选择及方案比较4
2.3.1 A2/O工艺4
2.3.2氧化沟工艺及其变形5
2.3.3 CASS工艺6
2.3.4 确定工艺方案9