Hardness removal of reverse osmosis drained wastewater and its effect on vacuum membrane distillation process
Revised date: 2009-12-02
Online published: 2010-10-01
Novel hydrophobic polyvinylidene fluoride （PVDF） hollow fiber membrane has been used for treating reverse osmosis（RO） drained wastewater from a chemical plant by vacuum membrane distillation（VMD） method. The effects of the hardness removing method,and the dosage of the hardness removing agent on the flux decline of VMD RO drained wastewater treatment are studied emphatically. The hardness removal rate reaches 96% with optimized hardness removal agents added in the wastewater. When the wastewater is treated by hardness removing method,the initial flux of VMD process reaches 25.8 kg/(m2·h) and keeps at 14.8 kg/(m2·h) after the water was concentrated 10 times. During the RO drained wastewater not being treated by hardness removing method， the initial flux of VMD process is 22.3 kg/(m2·h),and quickly declined to 10.2 kg/(m2·h) when it is concentrated to 2.5 times.
Liu Dong, Wu Chunrui, Lü Xiaolong . Hardness removal of reverse osmosis drained wastewater and its effect on vacuum membrane distillation process[J]. Industrial Water Treatment, 2010 , 30(5) : 23 -26 . DOI: 10.11894/1005-829x.2010.30.(05).23
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