混凝-臭氧/吸附-超滤-反渗透组合工艺对页岩气返排液水质净化效能分析

WATER PURIFICATION EFFICIENCY OF SHALE GAS FLOWBACK WATER BY COAGULATION-OZONE/ADSORPTION-UF-RO COMBINED PROCESS

页岩气返排液中部分小分子有机物如二甲基苄胺(DMBA)、吲哚啉和6-甲基喹啉较难去除,采用混凝-臭氧/吸附-超滤-反渗透组合工艺处理页岩气返排液,探究了其有机、无机组分的去除规律。结果表明:混凝-臭氧-超滤-反渗透组合工艺对离子的去除率为96.7%~99.86%,对DOC和UV_(254)的去除率分别为98.7%和99.13%,对DMBA、吲哚啉和6-甲基喹啉去除率分别为82.02%、98.02%和97.67%;混凝-吸附-超滤-反渗透组合工艺对离子的去除率为95.99%~99.86%,对DOC和UV_(254)的去除率分别为95.31%和97.54%,对DMBA、吲哚啉和6-甲基喹啉去除率分别为70.19%、94.70%和87.93%。混凝-臭氧/吸附-超滤-反渗透工艺可有效去除返排液中的离子、DOC和UV_(254),对DMBA、吲哚啉和6-甲基喹啉的去除效果显著,有利于返排液的外部回用。

Some low molecular weight organics,such as dimethylbenzylamine(DMBA),indoline and 6-methylquinoline are difficult to remove from shale gas flowback water(SGFW).The combined process of coagulation-ozonation/adsorption-UF-RO was used to treat the SGFW to explore organic and inorganic components’removal efficiency.The results showed that:the removal rates of ions by coagulation-ozone-UF-RO combination process were 96.7~99.86%,the removal rates of DOC and UV_(254)were 98.7%and 99.13%,and the removal rates of DMBA,indoline and 6-methylquinoline were 82.02%,98.02%and 97.67%;the removal rates of ions by coagulation-adsorption-UF-RO combination process were 95.99~99.86%,and the removal rates of DOC and UV_(254)were 95.99%~99.86%,the removal rates of DMBA,indoline and 6-methylquinoline were 70.19%,94.70%and 87.93%.Coagulation-ozonation/adsorption-UF-RO process could effectively remove ions,DOC and UV_(254)in the effluent,and has significant removal effect on DMBA,indoline and 6-methylquinoline.The combined process could effectively ensure the external reuse of SGFW.