石化污水反渗透浓水“零排放”技术

"Zero Discharge" Process for Reverse Osmosis-Concentrated Petrochemical Wastewater

采用微滤—反渗透(RO)—蒸发—结晶工艺处理某石化企业的RO浓水,实现了RO浓水的"零排放"。试验结果表明:经加碱、微滤后,污水硬度平均减小率为98.8%,排出的滤渣平均质量分数为9.4%,减少了污水中有机物和微生物对后续RO膜的污染;微滤产水无需降低pH,可直接进入RO系统,电导率减小率可达98.0%;蒸发可将总固体质量浓度由13 290 mg/L增至172 155 mg/L,产水电导率为66μS/cm。

Reverse osmosis（RO） concentrated wastewater from a petrochemical plant was treated by microfiltration-RO-evaporation-crystallization process realizing ＂zero discharge＂ . The test results show that： After alkali addition and microfiltration, the average decreasing rate of the wastewater hardness is 98.8%, the average mass fraction of the filter residue is 9.4%, therefor the fouling of RO membrane due to organic compounds and microorganism in the wastewater is reduced; The microfiltration effluent can flow into the RO system without pH reducing, the decreasing rate of RO effluent conductivity can reach 98.0%; In the evaporation process, the total solid mass concentration is increased from 13 290 mg/L to 172 155 mg/ L, its effluent conductivity is 66 μS/cm.