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International Workshop on Decentralized Domestic Wastewater Treatment in Asia

MOEJ held the 8th Workshop on 21st January, 2021

The 8th workshop has been held by MOEJ successfully. 
Thank you very much for your participation.
We are pleased to receive your feedback. If you have any queries, questions, or suggestions, please contact the Secretariat of this Workshop, below.

Yurie Shirakawa
Senior Researcher, JECES


From the Perspective of Japan's Experience in Decentralized Wastewater Management: Water-borne Diseases and Disasters (heavy rain and earthquake)

Participants were expected to understand the risk of water-borne diseases derived from decentralized wastewater treatment and to discuss the countermeasures.In addition, we shared the knowledge and case study based on Japan's experience in human waste and wastewater management under disasters such as floods and earthquakes .


Date: 21st January, 2021

Time: 17:00~19:00 (Japan standard time)

Venue: Webinar via Zoom 

Language: English / Japanese (simultaneous interpretation)

Organizer: Ministry of the Environment, Government of Japan (MOEJ)

Material download

A-1(2023-04-12 ・ 1060KB)

Dr. Dai Simazaki

Chief Senior Researcher, Water Supply and Management Section, Department of Environmental Health, National institute of Public Health, Japan

Mechanism of major water-borne diseases and global infection status 
Measures against water-borne diseases

A-2(2023-04-12 ・ 962KB)

Ms. Moemi Shiraishi
Section Chief, Office for Promotion of Johkasou, Waste Management Division, Environmental Regeneration and Material Cycles Bureau, MOEJ

Maintenance system for Johkasou in Japan (legal framework of O&M, maintenance and operation vendor, Johkasou desludging vendor, etc.)
Blocking the COVID-19 infection route, Disinfection, Precautions when O&M

A-3(2023-04-12 ・ 7920KB)

Dr. Hiroyuki Katayama
Professor, Department of Urban Engineering, School of Engineering, The University of Tokyo

Research on COVID-19 in the sewage treatment field
Effect and importance of disinfection

B-1(2023-04-12 ・ 1476KB)

Mr. Susumu Asakawa
Senior Managing Director,
Saitama-ken Environmental Analysis & Research Association

Example: improvement of the water environment by switching from Old type johkasou (septic tank) to Johkasou

B-2(2023-04-12 ・ 4811KB)

Dr. Keizo Niki
Director, Research and Development Division, Japan Education Center of Environmental Sanitation

Sharing the recognition that human waste and wastewater management are important from the viewpoint of public health
Introduction of the actual situation of sewage management in areas where floods occurred in Japan
Example: Installation of an emergency-using Johkasou at a disaster prevention base or an evacuation center (in a sewerage area)

B-3 (2023-04-12 ・ 3426KB)

Mr. Kikuya Shibata
Secretary General, Miyagi Prefectural Authority for Living Environment

Introducing the actual situation of wastewater treatment system (sewerage and Johkasou) under disasters
Case study of Johkasou installation to temporary housing

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