重金属废水处理工艺设计毕业设计论文.doc

重金属废水处理工艺设计 Heavy metal wastewater treatment process design 学 院：理 学 院 专 业 班 级：环境工程班 学 号： 学 生 姓 名： 指 导 教 师： （副教授） 201 年 6 月 摘 要 关键词： Abstract At present,water pollution problem has become a global common problem,a serious impact on the survival of humanity and the social and economic development,and attaches great importance to more and more human.Therefor, to control water pollution and protect water resource have become a human target . With the speedy development of the electroplating enterprise in our country,electroplating,as one of the biggest pollutions in the world,cause the pollution more and more severely. As we all know ,electroplating can produce wastewater with a lot of heavy metal ions ,and heavy metal wastewater also has many of toxic substances,which direct efflux without treatment will cause serious water pollution.So,it is important to remove heavy metal of the wastewater in the electroplating .Chemical and physical treatment of wastewater treatment is an important means of purifying sewage，however，The combination of the two approaches is more effective. This paper first describes the significance of heavy metals in waste water treatment，the hazardous of heavy metal plating ,basic status of electroplating wastewater treatment and treatment .For example Biological , Physical chemistry ,Electrochemical ,Chemical method , then combined with the actual conditions and processing requirements of a electroplating factory in Zhejiang province ,it is decide to use the combination of Physical method and Chemical method to treat the wastewater .Chemical method is the use of a neutralization method with flocculation. The physical method is the use of physical precipitation. The approach taken in the process simple and easy to operate and simple principle. For the use of chromium-containing wastewater flocculation reaction under acidic conditions should first be adding a reducing agent, the reduction of Cr6 + to Cr3 +, then add Ca OH 2 for chemical