Abstract
This study is aimed at suppressing leaching zinc from infills such as SBR (styrene-butadiene rubber) by using acid solutions as a representative of acid rain. The concentrations of leaching zinc increased along with the increase in the content of zinc in the infills. Chemical and physical treatments were investigated in order to remove zinc from the SBR. Sulfuric acid, sodium hydroxide, and EDTA were used for the chemical treatment, and super sonic method and conventional heating were used for the physical treatment. In the case of the SBR infills without the treatments, the leaching concentration of zinc at pH3 exceeded the effluent standard (2mg/L) in Japan. However, concentrations from the SBR infills receiving the treatments did not exceed the effluent standard.
