污水处理厂初步设计方案..docVIP

污水处理厂初步设计方案 摘 要 本设计是天津市某开发区污水处理厂的初步设计和施工图设计。该处理厂处理城市污水。水质较复杂： 悬浮物（SS）：200mg/L； 五日生化需氧量（BOD5）：200mg/L； 化学需氧量（CODcr）：400mg/L； 总氮（N）：40mg/L； 总磷（P）：4.0mg/L； 重金属及有毒物质：微量； 处理后的水质要求： BOD5≤20mg/L； SS≤20mg/L； N≤15mg/L； P≤1mg/L； 根据设计要求和求新的思想，该污水处理工程进水中氮、磷含量均偏高，在去除BOD5和SS的同时，还需要进行脱氮除磷处理，故采用当代水处理工艺中较流行的三沟式氧化沟工艺。该工艺综合了以往工艺的优点，具有广泛的适应性，完全适合本设计的实际要求。本工艺的主要构筑物包括闸门井、格栅、污水泵房、曝气沉砂池、氧化沟、接触池、浓缩池、污泥脱水机房等。 本设计采用了脱氮除磷工艺和性能优良的设备，且工艺流程简单，省去了初沉池、二沉池、消化系统和回流设备，节省了基建投资和运行费用，同时曝气设备和构造形式多样，运行灵活，管理方便，保证出水达到污水排放标准，做到了水资源的合理利用。 关键词：三沟式氧化沟 格栅 浓缩池 泵房 新工艺 Abstract It is a preliminary design and construction drawing for the sewage treatment plant development zone of Tianjin . This plant treat municipal sewage,mainly.Itswaterqualityismorecomplicated: Suspended substance (SS ): 200mg/L; The biochemical oxygen demand (BOD5 ) of five days: 200mg/L;  The chemical oxygen demand (CODcr ): 400mg/L;  Total nitrogen (N ): 40mg/L;  Total phosphorus (P ): 4.0mg/L; Heavy metal and noxious substance: Trace; Treated water quality is required:  BOD5≤20mg/L;  SS≤20mg/L;  N≤20mg/L;  P≤1mg/L; According to the designing requirement and thought of looking for novelty: the content of nitrogen andphosphorus are on the high side in this project water quality,so it shoud be dealed with,while get rid of BOD5 and SS .We adopt and use a kind of craft,which is a comparatively extensive denitrification crafts at present, namely, 3 ditch type oxidizing craft. The advantage of this comprehensive craft is extensive adaptability , totally suitable for reality originally designeds purpose. Its main structures includ gate well , grid , sewage pumping house , earate and sinking sand pool , oxidizing ditch , contacting pool , concentration tank , mud to dehydrate in the computer lab etc.  This design have adopted the denitrification craft and equipment of good performance, and the procedure is simple, management is convenient, do not