Method for treatment of sludge

A method for treatment of sludge, comprising:

• a) providing a sludge treatment system comprising a facultative digestion tank, a membrane module, a blower aeration system, a sludge pump, and a drainage pump;
• b) pumping sludge into said facultative digestion tank via said sludge pump;
• c) providing air-water scouring bubbles against said membrane module to synchronously aerate and scour said membrane module by said blower aeration system, wherein an air-water ratio of said air-water scouring bubbles is between 10 and 30 to 1;
• 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 to separate sludge and water;
• and
• f) draining said water via said drainage pump.

A method for treatment of sludge, comprising:

• a) providing a sludge treatment system comprising a facultative digestion tank, a membrane module, a jet aeration system, a sludge pump, and a drainage pump;
• wherein said jet aeration system comprises a jet aerator, an air inlet, a water inlet, an outlet, an aeration pipe, an aeration branch pipe, and a perforated aeration tube;
• said jet aerator is disposed between said membrane modules or at the side of said membrane module;
• said air inlet is disposed above the liquid surface of said facultative digestion tank;
• said water inlet is disposed below the liquid surface of said facultative digestion tank;
• said perforated aeration tube is disposed equidistantly below said membrane module, and is connected to said outlet via said aeration pipe and said aeration branch pipe;
• b) pumping sludge into said facultative digestion tank via said sludge pump;
• c) synchronously aerating and scouring said membrane module by said jet aeration system;
• d) maintaining most of the area of said facultative digestion tank in a facultative or anaerobic state, and maintaining an average concentration of dissovled oxygen in said facultative digestion tank at below 1.0 mg/L, controlling facultative microbes as being 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 to separate said sludge and water;
• and
• f) draining said water via said drainage pump.