毕业设计 青岛城阳污水处理厂设计.doc

I 摘要 A 2/O法是流程最简单, 应用最广泛的脱氮除磷工艺。污水首先进入厌氧池,兼性厌氧菌将污水中的易降解有机物转化成 VFAs 。回流污泥带入的聚磷菌将体内的聚磷分解, 此为释磷, 所释放的能量一部分可供好氧的聚磷菌在厌氧环境下维持生存,另一部分供聚磷菌主动吸收 VFAs ,并在体内储存 PHB 。进入缺氧区, 反硝化细菌就利用混合液回流带入的硝酸盐及进水中的有机物进行反硝化脱氮, 接着进入好氧区, 聚磷菌除了吸收利用污水中残留的易降解 BOD 外,主要分解体内储存的 PHB 产生能量供自身生长繁殖, 并主动吸收环境中的溶解磷, 此为吸磷, 以聚磷的形式在体内储存。污水经厌氧,缺氧区,有机物分别被聚磷菌和反硝化细菌利用后浓度已很低, 有利于自养的硝化菌的生长繁殖。最后, 混合液进入沉淀池, 进行泥水分离, 上清液作为处理水排放, 沉淀污泥的一部分回流厌氧池,另一部分作为剩余污泥排放。本工艺在系统上可以称为最简单的同步脱氮除磷工艺, 总的水力停留时间少于其他同类工艺。而且在厌氧- 缺氧- 好养交替运行条件下, 不易发生污泥膨胀。关键词: 厌氧池,缺氧池,好氧池,脱氮除磷,A 2/O, 有机负荷 Abstract II Abstract A 2/O method is the most simple process, one of the most widely applied to take off the nitrogen phosphorus removal process. First YanYangChi into wastewater, sewage of facultative anaerobic bacteria of easily anics into VFAs. Backflow sludge into the phosphorus enrichment bacteria body phosphorus enrichment pose, this for release phosphorus, the release of energy for the part of aerobic bacteria phosphorus enrichment in anaerobic environment survive, the other part of phosphorus enrichment bacteria for active absorption VFAs, and in store inside body PHB. Oxygen into the area, denitrifying bacteria by using the mixture of nitrate and water into the backflow anic matter for denitrification denitrification, then into good oxygen area, phosphorus enrichment bacteria in addition to absorbing sewage residual of easily degradable BOD outside, main position of the store inside body produces energy PHB grow for itself, and the dissolution of active absorption conditions of phosphorus, this isp uptake, in the form of phosphorus enrichment in store inside body. The sewage is anaerobic, lack of oxygen area, organic matter were phosphorus enrichment bacteria and denitrifying bacteria using the concentration is low, which is helpful for the denitrifying bacteria growth autotrophic breeding. Finally, the mixture into the sediment basins, spate separation, clear liquid water treatment on as emissions, part of the sludge precipitation backflow YanYangChi, another