Demonstration test on purification systems of contaminated water using liquid–solid settling technology by flocculants (decontamination technology using high-pressure water)

For the purpose of decontaminating residential buildings, roads, rubble, and so on, the high-pressure water washing decontamination system had been developed, which are composed of a recovery system for contaminated washing water and mobile purification system of liquid–solid settling technology by flocculants. The high-pressure washing technology applied in this demonstration test can be used for both high- and ultrahigh-pressure washing decontamination and water surface chipping, by changing pumps and attachments. These systems were applied to decontaminate pools, concrete floor and side ditch around the pool in an elementary school located at Motomiya, Fukushima Prefecture as a demonstration test. Additionally, to compare decontamination effects, the tests, to chip and decontaminate surfaces of outer concrete and asphalt pavement had been conducted. From the results, high-pressure water jet decontamination systems have been practically proven.