Hiroo Takabatake

More than 30% energy saving seawater desalination system by combining with sewage reclamation.

Abstract Although seawater reverse osmosis (RO) system has been applied commonly in the world, there are still remaining two key issues for further expansion; (1) High energy consumption and (2) Marine environmental impact attributing to high salt concentration of brine water. Herein, new seawater RO system that enables us to overcome the issues has been proposed. The key feature of this system is to reduce salt concentration of seawater by dilution using the water derived from wastewater treatment or reclamation system to achieve the extreme energy reduction of high pressure pump and to make salt concentration of brine water to the same level as the seawater. In order to demonstrate this system, a demo plant designed “water plaza” was built up and operated in Kitakyushu, Japan, where 1,500 m3/d of sewage and 500 m3/d of seawater are used as raw water, and product water is supplied and used as a boiler feed raw water in the Shin-Kokura Thermal Power Plant of Kyushu Electric Co., Inc. During the plant oper...

Removal characteristics and fluctuation of norovirus in a pilot-plant by an ultrafiltration membrane for the reclamation of treated sewage.

ABSTRACT When ultrafiltration (UF) membrane processes that are able to effectively reduce viruses are installed in a waste water reclamation system, the security of sanitation safety for water-borne diseases is essential. It is important to understand the behaviour of enteric viruses such as Adenovirus, Rotavirus and Norovirus (NV), the detection rate of which is relatively high in sewage. This study focused on the UF membrane process for the reclaimed water treatment process, and investigated the removal performance in NV type GI and GII in the UF membrane process by performing coagulation and sedimentation as the pre-treatment process in a pilot-plant by considering the concentration fluctuation of the influent. The removal ratio of GI and GII by the UF membrane process alone was 3.3 ± 0.7 Log in GI and 3.6 ± 1.0 Log in GII, and no clear difference in the removal ratio by NV species type was observed. The removal ratio of NV GII was increased by about 0.6 Log on average (4.2 ± 1.1 Log) compared with the UF membrane process only when the coagulation and sedimentation process were conducted as pre-treatment. However, there was no significant difference in the removal of NV GI by conducting the coagulation and sedimentation process.