| 摘要 |
PROBLEM TO BE SOLVED: To provide a dirt washing system easy to apply and high in effect while avoiding the installation of a large-scale apparatus, foaming and increase in wastewater load caused by a surfactant, and deterioration of a working environment caused by hydrazine and high-concentration hydrogen peroxide, in a method for washing, during the operation of a water system, mainly soft dirt deposited on a piping part and a heat exchanger in the water system installed in various factories and buildings.SOLUTION: A dirt washing method for a water system includes adding hydrogen peroxide into water-system water in which metal ions generating colloid in water of pH 6.0-9.5 is present, and then adding a hydrogen peroxide degrading enzyme. |
