5万吨天生活污水厂设计(改良氧化沟工艺)学位论文.doc

PAGE  PAGE 43 2013届毕业生 毕业设计 题 目:某县 5.0万吨/天生活污水厂设计（改良氧化沟工艺） 院系名称： 化 学 学院 专业班级： 学生姓名： 学 号： 指导教师： 教师职称： 教 授 2013年05月18日  摘 要 在我国目前的技术、经济条件下，氧化沟污水处理技术被认为是出水水质好、运行可靠的污水生物处理方法，特别是其封闭循环式的池型较适用于污水的除磷脱氮。对于中小城市及乡镇采用氧化沟处理污水来说，其建设速度快、投资省、管理方便等优点，使得能收到很好的预期效果。 日处理量为5.0万吨的小型污水处理厂，采用改良氧化沟工艺，以改进型四沟式氧化沟和曝气生物滤池为核心处理构筑物。污水通过管道进入提升泵房、经细格栅后进入厌氧池+氧化后的生物反应池中，在氧化沟内与回流污泥在厌氧池内混合，进行磷的释放，然后进入改进型的四沟式氧化沟，出来的清水进入气水反冲洗滤池中进行深度处理，最后经紫外线消毒后出水。四沟式氧化沟采用边沟排泥，这样既有利于除磷，又有利于后续的污泥处理；通过工程实践，根据氧化沟工艺设计和应用中存在的缺点和问题，提出氧化沟处理生活污水和工业废水的完善措施和发展趋势。 关键词：改进型四沟式氧化沟；曝气生物滤池；脱氮除磷；  Title 50,000 t/d sewage plant design based on improved oxidation ditch process for a county Abstract In our current technology, economic conditions, the oxidation ditch wastewater treatment technology is considered the water quality is good, reliable operation of biological wastewater treatment methods, Especially its closed circular pool type is more suitable for phosphorus and nitrogen removal of sewage. Oxidation ditch sewage treatment for small and medium-sized cities and towns, the speed of its construction, investment, management and easy, so expected to receive good effect. Daily processing capacity of 50,000 tons of small sewage treatment plants, improved oxidation ditch process, improved four oxidation ditch and Biological Aerated Filter as the core processing structures. Sewage through a pipe into the upgrading pumping stations, into the anaerobic tank through fine grid + oxidized biological reaction vessel, in the oxidation ditch and the return sludge in the anaerobic tanks mixed phosphorus release, and then enter the Improvedthe four oxidation ditch, out of the clear water into the gas-water backwash filter depth processing, the final effluent after UV disinfection. The four oxidation ditch Ditch mud, both for phosphorus removal, but also conducive to subsequent sludge treatment; engineering practice, according to the