WASTEWATER TREATMENT SYSTEM AND WASTEWATER TREATMENT METHOD

• Main Authors: FUCHIWAKI KENJIRO, OKATA MASANOBU
• Format: Patent
• Language: English
• Published: 25.10.2007
• 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 provide a wastewater treatment system capable of further reducing the production amount of excess sludge, and a wastewater treatment method. SOLUTION: The wastewater treatment system 1 comprises an activated sludge treatment tank 10 for carrying out activated sludge treatment of water to be treated, a solid-liquid separation tank 20 for carrying out solid-liquid separation of a treated substance including sludge in the activated sludge treatment tank, sludge concentration means 30 for concentrating a part of the sludge subjected to the solid-liquid separation by the solid-liquid separation tank, a sludge modification tank 40 for storing the concentrated sludge which is the sludge concentrated by the sludge concentration means for a fixed time and a recirculation line for recirculating the concentrated sludge in the sludge modification tank to the activated sludge treatment tank. COPYRIGHT: (C)2008,JPO&INPIT