WATER QUALITY CONTROLLING DEVICE FOR SEWAGE TREATMENT PLANT

• Main Authors: KAWADA YUKIHIKO, NAGAMORI YASUHIKO, NAGAIWA AKIHIRO, KISHIHARA MASAKI, TSUTSUMI MASAHIKO, MURAYAMA SEIICHI, YAMANAKA OSAMU, MATSUMAE MANABU, HATSUKA YUKIO, NASATO ATSUSHI
• Format: Patent
• Language: English
• Published: 18.09.2001
• 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 provide a water quality controlling device for sewage treatment plant which enables keeping various items of water quality in the sewage treatment plant excellently at all times without using discontinuous and low precision sensors. SOLUTION: The prescribed quantities of state (water quantity and water quality, etc.), in the sewage treatment plant 50 are measured by sensors which enables performing continuous and high precision measurement such as flow meters 80-84, a UV meter 85 and a DO meter. Further, the value of item of water quality (NH4 value in the treated water) which is difficult in measurement within a prescribed measuring period is measured by using a simulation model of water quality such as ASM 2 in simulator sensor 90 in accordance with the measured values. Thereafter, valve opening of a stop valve 58 is controlled in such a manner that DO value is made constant in accordance with the outputted value (NH4 value of the treated water) which is outputted from the simulator sensor 90 by a DO control target value calculating part 94, a DO control part 95 and a gas volume control part 96.