环境工程毕业设计.doc

摘要
我国水体污染主要来自两方面,一是工业发展超标排放工业废水,二是城市化中由于城市污水排放和集中处理设施严重缺乏,大量生活污水未经处理直接进入水体造成环境污染。工业废水近年来经过治理虽有所减少,但城市生活污水有增无减,占水质污染的51%以上。
本设计要求处理水量为60000m3/d的城市生活污水,设计方案针对已运行稳定有效的A2/O活性污泥法工艺处理城市生活污水。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(CODNB)能被开环或断链,使得N、P、有机碳被同时去除,并提高对CODNB­的去除效果。它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NH3-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。
关键词:城市生活污水,活性污泥,A2/O
Abstract
Our major water pollution from two aspects, one is the industrial development of industrial wastewater discharge exceeds bid, urbanization and urban sewage discharge due to serious lack of facilities for central treatment of sewage treatment, without directly into the water environmental pollution. In recent years, through the governance of industrial wastewater is reduced, but the city life sewage grew more and more, the water pollution has kaken up to 51%.
The design requirements for 60000m3/d water treatment of municipal sewage, the design scheme for stable operation effective A2/O activated sludge process urban sewage. A2/O process due to different environment conditions, the different functions of microbes, together with anic anaerobic, hypoxia conditions, not part of anic biological catabolic (CODNB) can be open or broken, chain N, P anic carbon was also removed, and improve the effect of CODNB there. It plete removal anic matter, nitrogen and phosphorus nitrification and remove the excess intake of functions, nitrogen is the premise of NH3-N should fully nitrification, aerobic pool can finish this function plete, oxygen and nitrogen pool. an-oxygen pool and oxygen pool pleted phosphorus function.
Key words: urban sewage,activated sludge,A2/O
目录
引言……………………………………………………………………………...1
1 设计概述……………………………………………...………………………2
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设计依据 3
2 工艺流程及说明 3
工艺方案分析 3
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流程各结构介绍 4
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3构筑物设计计算 7
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