Treatment of vegetable oily wastewater using an integrated microfiltration-reverse osmosis system.
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.
Yu
Xiaoli
X
State Key Laboratory of Materials-Oriented Chemical Engineering, Membrane Science and Technology Research Center, Nanjing University of Technology, Nanjing 210009, China. xingwh@njut.edu.cn
Zhong
Zhaoxiang
Z
Xing
Weihong
W
D005374:Filtration / Q000295:instrumentation* / Q000379:methods*; D006358:Hot Temperature; D009995:Osmosis; D010316:Particle Size; D010938:Plant Oils / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D010938:Plant Oils; D014867:Water