JPH0218917B

• Main Authors: SUZUKI TAKAYUKI, ENDO KANEAKI
• Format: Patent
• Language: English
• Published: 27.04.1990
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PURPOSE:To efficiently and stably treat organic waste water by separating it into a liquid which permeats a membrane and a liquid which does not permeat therethrough by means of an ultrafiltration membrane and subjecting the liquid which has permeated the membrane to anaerobic treatment. CONSTITUTION:Raw water is fed to a UF membrane filtering stage 2 via an introduction pipe 1, and incorporated SS and high molecular organic substances are separated. The liquid which has permeated through the membrane is fed to a UASB reaction tank 4 via a discharge pipe 3 thereof and organic substances contained in the liquid are subjected to methane fermentation by granules 5 of methane fermentation bacteria. The treated liquid wherein organic substances have been removed is discharged to the outside of the system via a discharge pipe 8 thereof. The liquid which has not permeated and contains. SS and soluble high molecular organic substances separated by the UF membrane is transferred to a dehydration treating stage 10 via a pipe 9 and subjected to a flocculating treatment by a flocculating agent and thereafter concentrated and dehydrated. Thereby an extremely high-load treatment can be performed.