Patent ID: 8262911

Claim:
A method for treatment of sludge, comprising a) providing a sludge treatment system comprising a facultative digestion tank, a membrane module, an aeration system, a sludge pump, and a drainage pump; b) pumping sludge into said facultative digestion tank via said sludge pump; c) synchronously aerating and scouring said membrane module by said aeration system; d) maintaining most of the area of said facultative digestion tank in a facultative or anaerobic state; maintaining an average concentration of dissovled oxygen in said facultative digestion tank at below 1.0 mg/L; and controlling facultative microbes to be predominant in said facultative digestion tank, thereby allowing for facultative digestion of said sludge to be conducted in said facultative digestion tank; e) pumping said sludge by said drainage pump and filtrating by said membrane module so that said sludge and water are separated; and f) draining said water via said drainage pump.