BIOLOGICAL WASTE WATER TREATMENT APPARATUS AND BIOLOGICAL WASTE WATER TREATMENT METHOD

• Main Authors: IMAI NAOKO, NAKAJIMA SHINOBU
• Format: Patent
• Language: English
• Published: 02.09.2005
• Edition: 7
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To sufficiently realize prevention of clogging of solid-liquid separation membrane and cost reduction. SOLUTION: Particulate microorganism adhering substance 2 having a microorganism adhering function is mixed into a biological treatment tank 1, and microorganisms in the biological treatment tank 1 are stuck to the microorganism adhering substance 2 to form a large floc, thereby the floc is prevented from going into the pore of the separation membrane 3 immersed in the biological treatment tank 1, and at the same time the separation membrane 3 is effectively washed by the contact of the flocs with the separation membrane 3 without damage of the membrane 3. Surplus sludge containing the microorganism adhering substance 2 and the flocs is taken out from the biological treatment tank 1 to be solubilized by a sludge solubilizing device 8. By the solubilization treatment, the microorganism adhering substance 2 incorporated into the sludge is recovered. Treated water from which the microorganism adhering substance 2 has been recovered is returned to the biological treatment tank 1, which dispenses with the supply of the microorganism adhering substance 2 and disposal of the surplus sludge and the microorganism adhering substance 2. COPYRIGHT: (C)2005,JPO&NCIPI