Purification of regional water quality by the Shuhai, rural sewerage treatment system

摘要

The objective of this study is to clarify the effect of the Shuhai, rural sewerage treatment system, to purify the canal water. We studied the water quality of the dual-purpose canal running through the Yokebori district, Kuki-shi, Saitama, where the JARUS- III. one of the major models for the Shuhai. was built in 1995. The canal ran through the settlement where household waste water was released The period of study was from 1994 to 1997. covering before and after the start of operation of the Shuhai. Before the start of operation of the Shuhai, water quality worsened markedly during the non-irrigation period. But the water quality of non-irrigation periods have improved since the introduction of the Shuhai except for the canal below the Shuhai plant, where water quality improved only in organic pollutants. During the irrigation periods, the rise in the level of pollutant concentrations running through the settlement decreased clearly. Based on the study, we concluded that the Shuhai purified the canal water clearly and considered that it would necessary to implement the advanced waste water treatment system and the sludge recycling system.