PRETREATMENT METHOD FOR LIVESTOCK SEWAGE AND NON- DILUTION TREATMENT METHOD FOR LIVESTOCK SEWAGE

摘要

PROBLEM TO BE SOLVED: To provide a method which makes it possible to obtain treated water which is <=20 mg/l respectively in the concentrations of BOD and SS and is approximately colorless and transparent in color. SOLUTION: This pretreatment method for livestock sewage comprises subjecting the sewage to solid-liquid separation treatment and subjecting the resultant treated water of the solid-liquid separation to floatation treatment thereby removing the SS in the livestock sewage by >=70%. This non-dilution treatment method for the livestock sewage comprises subjecting the treated water of the floatation treatment obtained by the method described above to carrier deposited bioreactor treatment, subjecting the resultant bioreactor treated water to membrane separation activated sludge treatment and subjecting the resultant treated water of the membrane separation activated sludge treatment to reverse osmosis treatment.