日本下水道新技術機構

As described above, eutrophication has caused serious water pollution in the three major bays and other designated lakes and reservoirs. To reduce the inflow of nitrogen and phosphorus that cause the problem, it is required to employ advanced wastewater treatment. In addition, to improve the quality of treated water, it should gradually be introduced to the plants that currently employ conventional activated sludge processing by promoting partial facility and equipment alteration. Aiming at the creation of a good social environment, JIWET has been working on the improvement of water quality with advanced wastewater treatment via joint research.

Joint research already conducted

「An investigation study about nitrogen and phosphorus removal process、
「Investigation Research on a Nitrification Promotion TypeAnaerobic Anoxic Oxic Process」etc.

Recent research

「Study of simultaneous nitrification and denitrification controlled by NADH」
「Evaluation Research on the Nitrification-denitrification Process」
etc.

+Result

+2013

• Investigation on the promotion for advanced wastewater treatment process using existing facilities
• Joint research about the effect verification of new water-treatment system in Yokosuka City

+2012

• Study of Nitrogen removal process controlled by NADH(Fukuoka city)
• Collaborative investigation about study of advanced wastewater treatment plan in Yokosuka City

+2009

• Study of Nitrogen removal process controlled by NADH

+2006

• Investigation Research on a Nitrification Promotion Type Anaerobic Anoxic Oxic Process

+2005

• Study on UV Disinfection of Treated Wastewaterfor Sewage Treatment Plants
• Investigation research on a nitrification advanced type anaerobic non-oxygen-aerobic method（Part II）

+2004

• Investigation of the practical application of a “sewage high-level treatment system using pre-coagulation and carriers”
• An investigation study about nitrogen and phosphorus removal process
• Research on Reduction of Flocculant Addition in Step Feeding Ｔｙｐｅ　Multistage Nitrification/Denitrification Process
• Research on performance evaluation of the high-speed filtration institution in the Sibaura water renovation center
• Investigation research on a nitrification advanced type aversion non-oxygen-aerobic method
• Research on the best collaboration of various wastewater treatment facilities in system upgrade

+2003

• Research on anaerobic-anoxic-oxic process using media with internal recycling (nitrate recycling)
• Joint research on reusing advanced treated effluent and on performance of advanced treatment process in Todoroki Water Treatment Center and Egawa river waterway
• Research on the utilization of the advanced treatment system using media and pre-flocculant

+2002

• Study on the improvement of the combined sewage systems by high-rate fiber filtration and the technology of fabric-filter treatment
• Study on the performance of the anaerobic-anoxic-oxic treatment process using media at Egawa water treatment center

+2001

• Investigation on the advanced treatment of simultaneous removal of nitrogen and phosphorus in the sewerage system
• Investigation on the efficiency of nitrogen and phosphorus removal by anaerobic-anoxic-oxic process using media

+2000

• Study on the buoyant media-type nitrification- denitrification process
• Questionnaire survey on benefit from advanced treatment adoption in Tokyo Bay basin

+1999

• Research on the utilization of the advanced treatment technology with a deep reactor in which a medium is used
• Joint research on the development of a high efficient nitrogen and phosphorus- removing process for the Kasumigaura Region Sewerage system

+1998

• Study on the technology of instrumentation and automation and control of the advanced wastewater treatment
• Joint research on the anaerobic/aerobic wastewater treatment technology
• Study on basic plan for advanced sewage treatment in specific areas of the Tone River System Basin

+1995

• Study on the new technology of the sewage treatment with effective land usage
• Study on Advanced Wastewater Treatment Technology in Mikasagawa-Nakagawa Regional Sewerage System

+1994

• Study on the sewage treatment system using media
• Study on the sewage membrane treatment

+1993

• Research on the utilization of a sewage treatment technology with effective land usage