毕设说明书 34doc.doc

西安建筑科技大学
本科毕业设计(论文)
题目
咸阳市某15万t/d城市
污水处理厂工艺设计
学生姓名
杨萌
学号
201004010243
院(系)
西安建筑科技大学华清学院
专业
环境工程
指导教师
王旭东
时间
2014年6月13日
摘要
该处理厂处理城市污水,且水质较复杂:
五日生化需氧量():200mg/L;
悬浮物(SS):190mg/L;
化学需氧量(COD):380mg/L;
TN:35mg/L
TP:
NH3-N:28mg/L;
处理后的水质要求;
BOD5≤10mg/L;
SS≤10mg/L;
COD≤50mg/L;
TN≤15
TP≤
NH3-N≤5mg/L;
根据设计要求和求新的思想,该污水处理工程进水中氮含量均偏高,在去除BOD5和SS的同时,还需要进行脱氮处理,故采用当代水处理工艺中较流行的工艺。工艺由于不同环境条件,不同功能的微生物群落的有机配合,加之厌氧、缺氧条件下,部分不可生物降解的有机物能被开环或断链,使得N、P、有机碳被同时去除,并提高对不可降解有机物的去除效果。它可以同时完成有机物的去除,硝化脱氮、磷的过量摄取而被去除等功能,脱氮的前提是NH3-N应完全硝化,好氧池能完成这一功能,缺氧池则完成脱氮功能。厌氧池和好氧池联合完成除磷功能。
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。本工艺的主要构筑物包括格栅、污水泵房、平流沉砂池、好氧池、厌氧池、缺氧池、二沉池、接触消毒池、浓缩池、污泥脱水机房等。
本设计采用了为主体工艺,工艺流程相对简单,省去了污泥消化系统,节省了基建投资和运行费用,该工艺处理污水运行稳定,易于管理,出水水质达到设计要求,真正做到了污水的综合利用。
关键词: 格栅泵房新工艺二沉池
This plant treats municipal sewage mainly. Its water quality is plicated:
Suspended substance (): 190mg/L;
The biochemical oxygen demand of five days (): 200mg/L;
The chemical oxygen demand (): 380mg/L;
NH3-N: 28mg/L;
TN:35mg/L;
TP:;
Treated water quality is required:
≤10mg/L;
SS≤10mg/L;
COD≤60 mg/L;
NH3-N≤5mg/L;
TN≤15mg/L;
TP≤;
According to the designing requirement and thought of looking for novelty: the content of nitrogen in the municipal sewage is on the high side in this project .so while getting rid of and, it should be treated with a proper process. We adopt and use a kind of craft, which is paratively popular craft at present named Anaerobic-Anoxic-Oxic.
The advantage of prehensive craft is extensive adaptability , totally suitable for reality originally designed purpose. Its main structures includes gate well , grid , sewage pumping house , earate and sinking sand pool , oxidizing ditch , the second sinking pool, contacting pool , concentration tank , mud to dehydrate in puter lab etc.
Process due to different environmental conditions, different functions of munities in anic, combined with anaerobic, anoxic condition, some n