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计总说明：水是生命之源，是人类赖以生存的必需品。在人类的发展史上，无论是过去、现在还是将来，水都起着举足轻重的地位，也是农业和工业得以发展的基础。但是随着时代的更迭，人类文明的进步，社会的发展，水资源受到的污染日趋严重，这也导致人类可用的水资源日益减少，归根结底还是因为人类保护水资源的意识不够强烈，还感受不到水资源的严重紧缺，因此政府需要将保护水资源的重要性彻底灌输给民众的同时，还必须重视起来，加大兴建污水处理厂的力度，缓解水资源匮乏的这一社会乃至全世界的现实问题。48411
本设计为氧化沟法处理某地区生活污水工艺设计，其主要任务是根据某地区生活污水水质水量情况，选择适宜的处理方案及工艺，并进行主要构筑物的计算，绘制总平面图、工艺流程图及相应的构筑物图纸，并编写设计说明书。
现拟定建成一座日平均处理污水为10万m3的污水处理厂，主要接纳城镇居民生活污水及工厂排水，生活污水约占70%，污水出水需达到以下排放指标：CODcr：≤60mg/L, BOD5：≤20mg/L，SS：≤20mg/L，NH3-N：≤15mg/L，pH:6～9 ，P：≤1mg/L。
氧化沟工艺作为活性污泥处理系统的一种首尾相连的封闭的循环流曝气沟渠，但和传统的活性污泥法不同。通过长年的运行，可以看到氧化沟处理的污水不仅出水水质好，同时还具有可靠性高，运行维护方便的特点。整个氧化沟工艺可以中使处理设施大大简化并且降低运行成本和设备维护的费用，因为无需设初沉池和污泥消化池。在我国，氧化沟凭借在经济上的优势和在技术上运行可靠，已在中小型污水处理厂中成为首选工艺。
本设计采用卡鲁塞尔氧化沟工艺。污水经缺氧、好氧交替运行，去除有机物的同时，还能脱氮和除磷。该工艺具有工艺流程短、处理效果好、出水水质稳定、剩余污泥少、运行管理方便、运行费用低的特点。出水水质严格执行《城镇污水处理厂污染物排放标准》（GB 18918－2002）中一级B标准。
毕业论文关键字： 城市生活污水；卡鲁塞尔氧化沟；构筑物计算
Treatment of Urban Domestic Wastewater in Use of Oxidation Ditch
General instructions on design: Water is the source of life and the necessity for human survival. In the history of human development, water always plays the most important role either in the past, present or in the future and is the foundation of the agriculture and modern industry. But along with the change of time, the progress of mankind civilization and the development of society, the pollution of water resource is increasingly becoming more and more serious, which means that the availability of water to human beings is becoming less and less. It is because human consciousness of protecting water resource is not strong enough and they do not feel the serious shortage of water resource, the government need to let people thoroughly know the importance of water resource and put more emphasis on construction of sewage treatment plant to ease the shortage of water in our country and the whole world.
This design targets at treatment of urban domestic wastewater in use of oxidation ditch. The main task is to select the proper plan and technique according to the water quality and the amount of the use of water, to calculate the primary structure, to draw the general plan, process flow chart and the corresponding construction drawings, and to compose directions for the design.
Now it is proposed to build the wastewater treatment plant which can be able to process 100,000m3/day. The wastewater consists of 70% town residents living sewage and 30% plant drainage. The effluent water quality needs to reach the following emission targets: CODcr：≤60mg/L, BOD5：≤20mg/L，SS：≤20mg/L，NH3-N：≤15mg/L，pH:6～9 ，P：≤1mg/L.