Japan Sewage Works Agency (JS) has been joining a collaborative research, gTreatment Performance Improvement of Final Settling Tank.h The consortium of Metawater Co., Ltd.; JS; and Matsumoto City implements the demonstration adopted for B-DASH Project*1 2017 as contract research of National Institute for Land and Infrastructure Management (NILIM.)
The technology adopts a gfiltration unit inside a final settling tankh set in just before its tank drain to trap solid matter of treated water in the tank. The filtration unit enhances the quantitative and qualitative performances of a final settling tank while requiring no additional facilities. The promising technology is expected to contribute the efficient retrofit adapting to the social needs of population decline, and the stable performance for wastewater treatment.
The verified performances in the demonstration are as follows:
(1) Quantity improvement: verify if the technology can increase the treatment quantity of a final settling tank up to twice with no quality degradation of treated water.
(2) Quality improvement: verify if the technology can improve the quality of effluent of a final settling tank equivalent to the effluent of rapid sand filtration when operated at designed treatment quantity.
Compared to the additional final settling tank or filtering facilities, the demonstration technology is expected to reduce construction costs dramatically.
The construction of the demonstration facilities starting in July 2017 has recently completed.
