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January 1, 2026Journal of Japan Society on Water EnvironmentOpen Access

Water Quality Improvement and Future Water Environment in Suikawa River, Iwate Prefecture, Japan

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Key Points

This research aims to evaluate the water quality improvement of the Suikawa River and its future environmental perspective.
Analysis of BOD levels over time from 2000 to 2018.
Evaluation of the impact of wastewater treatment facilities on river water quality.
Assessment of municipal sewerage connection efforts and improvements in local sanitation systems.
BOD levels dropped from over 50 mg L-1 in 2000 to below 5 mg L-1 after 2018.
Introduction of wastewater treatment significantly reduced pollution in the river.
Transient increases in BOD were noted during city events and rainfall, but these were minor.

Implication

Demonstrates water quality improvement in Suikawa River, indicating successful ecological recovery efforts.

Abstract

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Cite This Study

Morio TSUJI (2026) studied this question.

synapsesocial.com/papers/69b4fa9ab39f7826a300b577 https://doi.org/10.2965/jswe.49.37

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