中水深度净化工艺试验研究

Experimental study on deep purification process of reclaimed water

某石化公司中水回用过程存在腐蚀、结垢等问题,采用臭氧氧化-组合填料滤池工艺和电渗析工艺对中水进行深度净化处理,将中水中有机物消解或氧化成可被生物降解的小分子有机物,再利用吸附能力良好的活性炭和陶粒将小分子有机物吸附、过滤;同时锰砂能将水中低价铁离子氧化为高价铁离子,再经过吸附过滤去除水中铁离子以降低中水电导率、COD、浊度、铁离子含量、氯离子含量等水质指标,提高中水回用后循环水的浓缩倍率,确保循环水系统的平稳运行,能够有效控制系统的结垢腐蚀等问题。

In order to solve the problem of corrosion and scaling in the reuse of reclaimed water at a petrochemical company,ozone oxidation-combined filter process as well as the electrodialysis process was adopted in the deep purification treatment.The organic matter was digested or oxidized into biodegradable small molecule organic matter,which was then adsorbed and filtered by activated carbon and ceramsite;at the same time,low-valent iron ions in water were oxidized into high-valent iron ions by manganese sand,and were removed from water through adsorption and filtration,so as to reduce water conductivity,COD,turbidity,iron ions,and chloride ions,which improved the reuse efficiency of reclaimed water,guaranteed the smooth operation of circulating water system and effectively controlled the scaling and corrosion.