城生活污水厂处理工艺设计方案方案.docVIP

PAGE \* MERGEFORMAT I PAGE \* MERGEFORMAT I 摘要 当今随着经济的迅速发展，人民生活的不断提高，环境污染越来越严重，加大城市生活污水治理势在必行。本次设计是以相关的资料为依据，设计一座城镇生活污水处理厂，其日处理量为30000 m3/dm。. 水质条件：进水水质CODCr=350 mg/L；BOD5=180mg/L；SS=220 mg/L；氨氮28 mg/L；总氮35 mg/L；总磷4 mg/L由于城市污水的主要成分为固体悬浮污染物（即SS）和 溶解和胶体状态的有机污染物（即BOD）,所以本次设计采用了CASS工艺，经比较CASS工艺投资小，处理效果好， 管理简单等优点，适宜使用。本设计包含工艺流程的确定，工艺流程中单体的计算，施工图纸的绘制等。本工程的实施将显著改善受纳水体水质，同时间接产生经济效益，促进经济可持续发展，污水处理厂处理后的出水达到《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A标准 关键词：污水处理厂 CASS工艺 设计 Design of a Sewage Treatment plant in a city Abstract With the rapid development of todays economy, the continuous improvement of peoples living standards, more and more serious environmental pollution, increase urban sewage treatment is imperative.The design is based on the basis of relevant information, design an city sewage treatment plants,that daily processing capacity is 30000 m3/dm The parameter of enter water quality is that, BOD is 180mg/L, COD is 350mg/ L, SS is 220mg/L, NH3-N is 28mg/L, TP is 4mg /L，TN is 35mg /L .As the main component of urban sewage was suspended solid pollutants (ie, SS) and organic contaminants dissolved and colloidal state (ie BOD), so this design uses CASS process, small by comparison CASS technology investment, good effect, management and simple, suitable for use. The design includes the determination process, the process of calculating the monomer, construction drawings and other drawing.Implementation of this project will significantly improve the water quality of receiving water bodies affected, while indirect economic benefits, and promote sustainable economic development.The sewage after be treated from the tourist resort can achieve the emission requirements stairwastewater discharge standards (GB8978-2002). Key words: Sewage Treatment Plant ;CASS ditch; design 第一章 设计概论 1.1 设计原始资料 1.1.1 设计任务来源 辽宁科技大学环境工程系下达的任务书。设计题目为《城市污水处理CASS工艺的设计》。 1.1.2 设计水量和进出水水质 1、设计水量：景区日平均最大处理污水量为3万m3/d，，时变化系数1.5，最大日处理规模为4.5万m3/d。 2、城市处理水质达到《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A标准。进出水水质如表1所