WATER PURIFICATION EFFICIENCY OF SHALE GAS FLOWBACK WATER BY COAGULATION-OZONE/ADSORPTION-UF-RO COMBINED PROCESS
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摘要: 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UV254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UV254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UV254,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。
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关键词:
- 页岩气返排液 /
- 混凝-臭氧/吸附-超滤-反渗透组合工艺 /
- 水质参数 /
- 有机物
Abstract: 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 UV254 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 UV254 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 UV254 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. -
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