The process of zero hardness membrane chemical reactor (MCR)+ reverse osmosis of concentrated water+ nanofiltration+ disc tube reverse osmosis (DTRO)/electro dialysis (ED)+ evaporate and crystallize was applied to treat high salinity wastewater to achieve zero liquid discharge in petrochemical industry. The results showed that, the salt content in ED concentrated water was 15％ 25％, and that in DTRO concentrated water was 15％ -22％. There was negligible difference between ED and DTRO regarding the concentration of TDS, but the water quality and desalination rate of DTRO were significantly higher than that of ED. The quality of sodium sulfate separated by freezing crystallization was higher than that of thermal separation, although the thermal salt splitting was a simple and reliable operation, with low capital and operating cost. The process was stable and reliable in long-term operation. The product of sodium chloride and sodium sulfate was comparable to the purity of industrial salt.
NETL
NSTL
维普
万方数据
