【摘要】 以2 000 mg/L氯化钠模拟苦咸水,采用二价无机盐作为汲取液,研究了正渗透淡化苦咸水时的水通量;通过软件计算和试验研究了不同组成汲取液的纳滤性能,并且设计了二级纳滤系统用于汲取液的回收。结果表明:相同浓度时硫酸镁汲取液正渗透水通量最低,而氯化镁汲取液水通量最高;相反在纳滤过程中,硫酸镁汲取液性能最佳,氯化镁最差;稀释硫酸钠汲取液浓度为30 g/L时,二级纳滤过程可以将汲取液浓缩至初始浓度(60 g/L),并制得浓度低于500 mg/L的产水。更多还原

【Abstract】 Simulating 2 000 mg/L NaCl as brackish water,using divalent salt(Na2SO4,MgSO4,MgCl2 and their mixture solution) as draw solution,the water flux of forward osmosis(FO) for brackish water desalination was investigated.The nanofiltration(NF) performance for the recovery of draw solution was determined by software and experiment,and a dual NF process was designed for the recovery of diluted draw solution.Results show that the water flux of MgSO4 in FO process is lowest,and that of MgCl2 is highest.It is opposite in NF process that the NF performance of MgSO4 is best,and that of MgCl2 is worst.When the diluted draw solution of Na2SO4 is 30 g/L,it could be concentrated to the initial concentration(60 g/L) by a dual stage NF process,and the permeate TDS is lower than 500 mg/L.更多还原