[Permeate flux and membrane fouling controlling of a membrane bioreactor with gravity flow to treat domestic sewage and landfill leachate].
A novel membrane bioreactor (MBR) with gravity flow was applied to treat domestic sewage and landfill leachate. The variation of permeate flux and its impact factors were studied. The long-term test showed that the average permeate flux of this MBR couldbe 11.2 Lx (m(2) x h)(-1) under the pressure of 8.5 kPa for treating domestic sewage while 6.4 L x (m(2) x h) (-1) and 15.0 kPa, respectively, for landfill leachate. The permeate flux increased with increase of aeration density and decrease of activated sludge concentration when aeration density was less than 400 m(3) x (m(2) x h)(-1). While activated sludge concentration and aeration density had hardly impact on the permeate flux when aeration density was more than 400 m(3) (m(2) xh)(-1). The performances of several different cleaning solutions were tested and the results showed that NaOH-NaClO solution had the best cleaning efficiency. The permeate flux can recovered over 85% of the initial flux. A very high concentration of soluble extracellular polymeric substances (soluble EPS) existed in landfill leachate compared with domestic sewage, which was the main cause leading to a lower permeate flux when treating landfill leachate.
Chen
Shao-hua
SH
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Zheng
Xiang
X
Liu
Jun-xin
JX
D019149:Bioreactors; D004867:Equipment Design; D005374:Filtration; D008567:Membranes, Artificial; D008962:Models, Theoretical; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods
D008567:Membranes, Artificial; D012722:Sewage