水源における水道水の臭気発生源とその対策

摘要

本稿は，水源の発生源とその対策について述べたものである．水道水の臭気は，生物作用，人為的な化学物質，浄水処理中に塩素等との反応生成物が原因で発生する．また，水道原水汚染とは異なるが，配水管等のライニングに由来するものが発生源となることもある．日本の主要な水道水源は河川表流水である．河川水質の保全にあたっては，その流域内に利害関係者が多く，水源の保全を水道事業者独白で取り組むのは限界があるので，河川の流域協議会の活用により実施する必要がある．%This paper describes the origins of drinking water odors in water resource and its control. Odor in drinking water can originate from biological sources or processes, from contamination by synthetic chemicals, and from corrosion or as a result of water treatment (e.g., chlorination). Odor compound may also develop during storage and distribution due to microbial activity. The majority of water supply systems in Japan have a river or surface water as their water source. These rivers are generally subject to concerns for many stakeholders, with different perspectives, who are located in a rather limited area. This fact makes it unfeasible for water monitor the water quality at the water source on its own. The monitoring systems instead, should be implemented in cooperation with various concerned parties or through the organized working of a council that includes various members of the entire watershed. Some of the existing systems can be effectively used in this manner.