DEPHOSPHORIZATION MATERIAL, DEPHOSPHORIZATION APPARATUS, AND DEPHOSPHORIZATION BY-PRODUCT

摘要

A dephosphorization material is formed from concrete sludge resulting from centrifugal casting of concrete products, production of concrete, cleaning of concrete production equipment, or cleaning of concrete transporting vehicles. The dephosphorization material is used for dephosphorization treatment by a dephosphorization apparatus that includes a single reaction tank provided with a wastewater supply means, a dephosphorization material supply mean, and a recovery means. The dephosphorization apparatus removes phosphorus from phosphorus-containing wastewater, such as sewage water, based on the formula 10Ca²⁺+6PO₄³⁻+2OH⁻→Ca₁₀(PO₄)₆(OH)₂ and recovers through the recovery means a dephosphorization by-product that precipitates as crystals as a result of the reaction.