コンクリートスラッジを用いた炭酸塩鉱物化およびその利活用 : エコタンカル®、PAdeCS®

Abstract

Nippon Concrete Industries, Co. Ltd. has a collaborative work with the University of Tokyo, Tohoku University and Seikei University on the development of a novel mineral carbonation process using concrete sludge under the financial support by New Energy and Industrial Technology Development Organization (NEDO), and Ministry of Land, Infrastructure, Transport and Tourism of the Japanese government. Concrete sludge is a waste of fresh concrete, which is disposed of after filtration and neutralization. To reduce the cost for the waste treatment, we developed a new process to utilize the concrete sludge, where concrete sludge is converted to calcium carbonate (ECOTANKARU) and PAdeCS (Phosphorous adsorbent derived from Concrete sludge) by using water and flue gas containing CO_2. The obtained calcium carbonate is highly valuable with high purity (> 95%) and can be used for a wide range of fields. PAdeCS is a material which can be used as a material for recovering phosphorous from sewage water in the form of hydroxyapatite (HAP) and removing toxic substances in water such as arsenic, lead, boron.