某市12万污处理厂毕业设计.docx

**市污水处理厂工艺设计 PAGE \* MERGEFORMAT 75**市污水处理厂工艺设计I摘要本设计是在邓州市拟建一座工程规模为12万m3/d的污水处理厂。通过综合考虑邓州市概况及本工程的规模、进水特性、处理要求、运行费用和维护管理等情况，经技术经济比较分析，确定采用AAO生物脱氮除磷处理工艺。该污水厂的污水处理流程为：污水从粗格栅到污水提升泵房，再从泵房到细格栅，然后到旋流沉砂池、初沉池，再进入生物池（即AAO反应池），再从生物池进入二沉池，污水再经过接触消毒池后排入自然水体；污泥处理流程为：旋流沉砂池产生的垃圾直接外运处置，二沉池产生的剩余污泥则运入贮泥池，二沉池的回流污泥则通道管道、污泥回流泵房再次进入AAO反应池，经过贮泥、消化处理后的污泥，进入污泥浓缩脱水车间，最后外运处理。AAO工艺的生物处理部分由厌氧池、缺氧池和好氧池组成。厌氧池主要功能是释放磷,同时部分有机物进行氨化。缺氧池的主要功能是脱氮。好氧池是多功能的,能够去除BOD、硝化和吸收磷。本次设计所选择的AAO工艺，具有良好的脱氮除磷功能。此外该工艺还具有高效、节能的特点，且耐冲击负荷较高，出水水质好。因此,更具有广泛的适应性，完全适合本设计的实际要求。关键词：AAO工艺，脱氮除磷，总体布置 AbstractThis capital is designed to sewage treatment factory intending to build one project scale for120000 m3/d in Deng Zhou. Condition such as handling call for ,operation cost and defending administration by scale , water-entering characteristic property , considering Deng Zhou city general situation and this project synthetically, living things takes off a nitrogen by that technical economy, analyzing comparatively , adopt AAO for sure handling handicraft except the phosphorus. The selected AAO process, has a good Nitrogen and Phosphorus Removal.This sewage treatment plant for the sewage treatment process is: sewage from the coarse grid to enhance the pumping station,then from the pump to the fine grid,And then to the cyclone grit chamber, then entering the biological pool(AAO reactor),then from the pool into the secondary sedimentation tank,after exposure to water disinfection and then discharged into the natural water ; Sludge treatment process is : vortex grit chamber sludge into the sludge dewatering plant directly,secondary settling tank sludge are also brought into the workshop, secondary sedimentation tank produced returned sludge channel pipes, returned sludge from the pump to re-enter AAO reactor, after treatment plant sludge dewatering sludge,mud into the storage pool, the last is outward processing.The Anaerobic-Anoxic-Oxic process of biological treatment in part by the anaerobic tank anoxic and aerobic tank. The mai