Networking between water reclamation centers (promotion of advanced treatment)

<Development of the Hokubu No.2 Wastewater Treatment Plant Third Pump Facility>

In the sewage treatment of Yokohama City, we are promoting advanced treatment of facilities in line with the renewal of treatment facilities to reduce the pollution load of effluent into public water bodies.

In advanced treatment, the sewage treatment time is longer, so the existing pond capacity is insufficient. Therefore, in Hokubu No.1 Wastewater Treatment Plant and Kanagawa Wastewater Treatment Plant, where there is no site to expand the facilities, we plan to send sewage that cannot be treated to Hokubu No.2 Wastewater Treatment Plant, where advanced treatment facilities are located. This plan is called "network".

By using the existing trunk line that has already been in service for water supply, a network can be built with minimal facility maintenance. Currently, we are constructing a pump facility in Hokubu No.2 Wastewater Treatment Plant to pump water from the sewage system.

By networking, in addition to the advanced treatment of each water reclamation center, it is possible to renew and rebuild aging facilities, and to complement each other (risk diversification) the treatment function in the event of a disaster such as an earthquake. You.

The three effects of networking

(1) The advanced processing of northern Kanagawa Wastewater Treatment Plant is progressing.
It will be possible to convert existing standard law facilities into advanced treatment facilities in northern Kanagawa Wastewater Treatment Plant, where there is no room for the site. During remodeling, sewage from the stopped pond is sent to Hokubu No.2 Wastewater Treatment Plant via a network for treatment.
In the future, we plan to send water to Hokubu No.2 Wastewater Treatment Plant the shortage of capacity after deducting the increased amount of inflow and the processing capacity of the center where advanced treatment has been completed.

(2) It is possible to complement each other's sewage treatment functions in the event of a disaster.
Even if the sewage treatment function stops in the event of an earthquake or other disaster, it is possible to complement each other by using a network to supply water to Hokubu No.2 Wastewater Treatment Plant and using an advanced treatment facility that can withstand level 2 earthquake motions.

(3) It is possible to upgrade and rebuild aging facilities.
In order to upgrade and rebuild aging facilities, Hokubu No.1 Wastewater Treatment Plant, which is old, will be used to send sewage to Hokubu No.2 Wastewater Treatment Plant using a network to process sewage that has stopped functioning.

(1)　Name of construction　：　Construction of Hokubu No.2 Wastewater Treatment Plant No. 3 Pump Facility

(2)　Facility scale　：　2 floors above ground, 5 floors below ground, 37m wide x 47m long x 33.5m deep / 12.1m high

(3)　Amount of pumped water　：　235,800m3/day

(4)　Pumping Equipment　：　Pump type - Strate-axis swirl diagonal current pump 31m
Φ 600mm x 41m3/min -2 units, Φ 800mm x 82m3/min -1 unit, Φ 1200mm x 164m3/min -1 unit

(5)　Other major facilities
Sewage pump control method -VVVF control
Substation equipment
In-house power generation equipment - gas turbine engine (5000KVA)
Monitoring and Control System - Third Pump Facility Control Room + Central Monitoring Control System

(6)　Maintenance year　：　From FY2008 to FY2025