Obayashi Corp. has developed a method to decontaminate radiation-tainted pavement that is over three times as efficient as the conventional means, according to the major general contractor.
Most pavement contaminated with radiation from Tokyo Electric Power Co.'s Fukushima No. 1 nuclear plant is cleaned with water under high pressure, but this method tends to scatter radioactive materials because it is difficult to collect the wash water.
Obayashi's new method combines Kaercher Japan Co.'s cleaner, which collects water as it washes, and Binos Corp.'s technology to precipitate and aggregate radioactive materials in collected water.
The new method can decontaminate an area of some 1,000 sq. meters a day, compared with 300 sq. meters for the conventional method, Obayashi officials said.