We are planning a research facility, but domestic wastewater will come out along with wastewater from research, including heavy metals. Since the plumbing system increases, can I mix two wastewater and put it into a wastewater treatment facility?

Household wastewater (toilets, kitchens, baths, etc.) can be directly removed to the public sewer if there is no problem with water quality, so there is no need to be put into wastewater treatment facilities. If domestic wastewater is put into a wastewater treatment facility, wastewater treatment may be hindered, so separation from the research system is necessary.

Research wastewater containing heavy metals, etc. should be treated at wastewater treatment facilities (referred to as abatement facility, etc.) or after taking necessary measures for abatement measures and conforming to the wastewater standards for sewerage. Please integrate with wastewater. Please note that in order to easily monitor wastewater, we may instruct you to connect research and domestic wastewater separately to the sewer.

In addition, if the research facility falls under the No. 71 No. 2 test research institutes in Appendix 1 of the Water Pollution Control Law Enforcement Ordinance, install abatement facilities, etc. as it is necessary to notify Yokohama City in advance depending on the situation such as when collecting waste liquid or collecting waste liquid, etc., it is necessary to notify Yokohama City in advance, so please contact the Water and Soil Environment Division (Telephone 671-2835) directly in charge of water and Soil Environment Section (Information at the method at the water and method at the method at the water and the water and Soil Environment Section at the water and Soil Environment Section at the water and Soil Environment Section at the method at the method at the method at the time of wastewater system at the water and the method at the Water and Soil Environment Section (Telephone 671-related information at the time of wastewater system at the