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摘要
本设计是黑龙江G市污水处理厂的初步设计,主要任务是完成污水及污泥处理方法选择、工艺设计计算、污水厂平面图、高程图及单项处理构筑物施工图设计。
该城市排放的污水中BOD5、CODcr及SS严重超标,依据污水的水质、水量以及受纳水体的环境容量等相关资料,必须对其进行二级处理方可去除水中过量的有机污染物,达到排放标准进而保护环境,所以本设计采用SBR序列间歇式活性污泥法。
SBR是序列间歇式活性污泥法的简称,与传统污水处理工艺不同,SBR技术采用时间分割的操作方式替代空间分割的操作方式,非稳定生化反应替代稳态生化反应,静置理想沉淀替代传统的动态沉淀。它的主要特征是在运行上的有序和间歇操作,SBR技术的核心是SBR反应池,该池集均化、初沉、生物降解、二沉池等功能于一池,无污泥回流系统。经过这个废水处理工艺的废水可达到设计要求,可以直接排放。处理后的污泥经机械脱水后用作肥料。
通过此设计,污水处理厂建成后,本市的水污染问题能得到较好的解决,产生良好的环境效益,同时也会收到很好的经济效益和社会效益。
关键词: SBR工艺;污水处理厂;城市污水;活性污泥
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Abstract
This is the preliminary design of the sewage treatment plant of city G in Heilongjiang Province. The main task of this project is plete the scheme selection of sewage and sludge treatment putation and design the sewage plant horizontal plan elevation map and construction drawing of the monomer structure.
The contents of BOD5、CODcr and SS of the discharged sewage have surpassed the national standard in this city. It must be used secondary treatment to remove anic pollutants in sewage in order to meet discharge standards and protect environment,which is based on the quality and quantity of sewage the environmental capacity of the receiving water bodies and other relevant information. Therefore,sequencing batch reactor activated sludge process was used in this design.
SBR is the abbreviation of the sequencing batch reactor activated sludge process. Different from traditional sewage treatment process, SBR technology uses to substitute time division operation mode for space division, non-stable biochemical reactions for stable state, ideal precipitation for the traditional dynamic precipitation. The main feature is the sequencing and batch operation. The core of the SBR technology is SBR tank, which sets all of the functions of homogenization, primary sedimentation, biodegradation and secondary sedimentation in a tank, and no sludge return system. The outlet water of the plant meets the design requirements, which is allowed direct discharge into rivers. The t