污水处理技术外文翻译

本科毕业设计

外文文献及译文

文献、资料题目：Study on Disin fecti on and

Anti —microbial Tech no logies for Drinking Water

文献、资料来源：期干刊_____________________________

文献、资料发表（出版）日期：2001.1.9 院（部）：

专业：给水排水工程___________________________

班级：_________________________________

姓名：_________________________________

学号：_________________________________

指导教师：__________________________________

翻译日期：2010.3.30

外文文献：

Study on Disinfection and Anti-microbial Technologies for Drinking Water

ZHU Kun, FU Xiao Yong

(Dept. of Environmental Engineering, LAN Zhou Railway University, LAN Zhou 730070, China) Abstract: Disinfection by-products produced by the reaction between chlorine and dissolved organic compounds and other chemicals are considered as a worrying problem in the drinking water treatment process since a series of mutagenic carcinogen substances are formed including trihalomethanes (THMs). Among the tested disinfectants(chlorine , ozone , chlorine dioxide , potassium permanganate , chloramines and hydrogen peroxide etc. ) , chlorine dioxide has proved to be the most feasible and effective oxidant for drinking water treatment and removal of pathogens due to its oxidation efficiency , low cost and simple way of utilization.

A series of experiments indicate that chlorine dioxide can significantly restrain production of trihalomethanes (THMs) and control bacteria growth particularly for Cryptosporidium oocysts. The experiments verified that both ozone and chlorine dioxide are absolutely vital to ensure that any microorganisms arising from fecal contamination of water storage are destroyed. The paper discusses oxidation capacity of chlorine dioxide, especially for removing petroleum compounds, which is affected by reaction time, gas injection way, and pH of treated water.

Key words: disinfection; oxidants; water treatment; pathogens; chlorine dioxide CLC number: X523 Document code: A

1 Introduction

Chemical and filtration processes are two main methods used in China for treating drinking water meanwhile UV radiation has been used successfully for water treatment with relatively low flow rate. On the individual family level, usually chemical treatment is a feasible alternative. The following guidelines exist for the selection of suitable disinfectants: the reaction must be strong enough to extinct bacteria and control growth of micro - organisms, removal of contaminants should be done by decomposition, evaporation or precipitation etc, to eliminate or decrease the toxicity, oxidants or reaction by-products should not be harmful to human health, and the purification processesshould be practical and economical. The objective of this paper is to evaluate and discuss available dis in fecta nts for drinking