以MVR为核心的含盐废水处理工艺设计  

Design of Saline Wastewater Treatment Process with MVR as Core Treatment Unit

作　　者：张军 宋萌萌[2] 高兴 张茂刚 华佳 ZHANG Jun;SONG Meng-meng;GAO Xing;ZHANG Mao-gang;HUA Jia(Wuxi Research Center for Environmental Science and Engineering,Wuxi 214153,China;College of Architectural and Environmental Engineering,Wuxi City College of Vocational Technology,Wuxi 214153,China)

机构地区：[1]无锡环境科学与工程研究中心,江苏无锡214153 [2]无锡城市职业技术学院建筑与环境工程学院,江苏无锡214153

出　　处：《中国给水排水》2020年第24期109-114,共6页China Water & Wastewater

基　　金：江苏省大学生创新项目(201813748010Y);无锡城市职业技术学院院级重点课题(WXCY-2017-KZ-04);无锡城市职业技术学院科研创新团队项目(KYCXTD201801、KYCXTD201901);无锡城市职业技术学院“青蓝工程”资助项目;无锡市科学技术协会软科学重点课题(KX-19-C49);江苏高校“青蓝工程”资助项目。

摘　　要：无锡某化工厂含盐废水设计废水量约17 m^(3)/d,废水中主要含有钙、镁、铜、硝酸铵等污染物。根据原水水质特点并结合企业需求,进行了软化工艺与浓缩工艺的详细比选,确立了以石灰+碳酸钠为前端软化工艺,蒸汽机械再压缩技术(MVR)为核心浓缩工艺,并辅以RO末端处理的整体处理工艺。设计中,根据硝酸铵浓水回收的浓度需求结合废水易结晶特性,选定MVR压缩机为罗茨式压缩机并对级间管路进行了详细的保温与降阻设计。经过半年运行监测,系统运行稳定,操作管理方便,硝酸铵回收率达到92.6%,总体脱盐率在99%以上。通过硝酸铵废液浓缩回收与冷凝水脱盐回用,降低了一半以上废水处理成本。The wastewater treatment capacity of a chemical plant in Wuxi is about 17 m^(3)/d,which mainly contains calcium,magnesium,copper,ammonium nitrate and other pollutants. According to the characteristics of raw water quality and the needs of enterprises,the detailed comparison of softening and concentration process was carried out,and the whole treatment process with lime + sodium carbonate as the front softening stage,MVR as the core concentration unit and RO as the end treatment stage was established. In the designing process,according to the requirement of ammonium nitrate concentration for recovery of concentrated water and the easy crystallization characteristic of wastewater,MVR compressor was chosen as Roots compressor,and the detailed heat preservation and resistance reduction design of interstage pipeline were carried out. After operation monitoring for half a year,the system operation was stable,management was convenient,the recovery rate of ammonium nitrate was 92. 6%,and the total desalination rate was over 99%. More than half of the cost of wastewater treatment was reduced by concentrated recovery of ammonium nitrate wastewater and desalination of condensate water.

关 键 词：含盐废水 软化 蒸汽机械再压缩 

分 类 号：TU992.3[建筑科学—市政工程]