State Key Laboratory of Materials-Oriented Chemical Engineering, Membrane Science and Technology Research Center, Nanjing University of Technology, Nanjing 210009, China.
Water Sci Technol. 2010;61(2):455-62. doi: 10.2166/wst.2010.822.
Vegetable oil processing plants and catering trade often generate a large amount of oil-containing wastewater, which causes serious environmental problems. The objective of this work was to explore the feasibility of vegetable oil wastewater treatment with an integrated microfiltration-reverse osmosis (MF-RO) process. The influence of operational parameters on the separation behaviors were investigated in MF process. In MF continuous process the steady flux was around 90 (L/m(2) h) when the concentrated multiple reached 16, and the oil content in permeate was less than 12 mg/L. In the RO continuous process, antifouling membrane was used to treat permeate from the ceramic membrane process in order to improve the water quality. The RO process had a permeate flux of 24 (L/m(2) h) and water recovery rate of 95%. The permeate from the RO stage was free of oil, and its TOC and conductivity were less than 0.6 mg/L and 50 micros/cm, respectively. The results demonstrated that the two stage membrane process combining MF and RO is highly efficient in the treatment of oil-containing wastewater.
植物油加工厂和餐饮业经常产生大量含油废水，这会造成严重的环境问题。本工作旨在探索采用集成微滤-反渗透（MF-RO）工艺处理植物油废水的可行性。考察了操作参数对 MF 过程中分离行为的影响。在 MF 连续过程中，浓缩倍数达到 16 时，稳定通量约为 90（L/m2·h），透过液中的含油量小于 12mg/L。在 RO 连续过程中，采用抗污染膜处理陶瓷膜过程中的透过液，以提高水质。RO 过程的透过液通量为 24（L/m2·h），水回收率为 95%。RO 级的透过液不含油，TOC 和电导率分别小于 0.6mg/L 和 50μs/cm。结果表明，采用 MF 和 RO 两级膜工艺处理含油废水效果显著。
