School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, People's Republic of China.
Environ Technol. 2022 Jan;43(1):34-41. doi: 10.1080/09593330.2020.1774664. Epub 2020 Jun 4.
Electric arc furnace (EAF) slag aggregate, a waste by-product of the steel industry, exhibited a high potential for phosphorus (P) removal and had attracted considerable attention. The main objectives of this study were to evaluate the performance of using EAF slag aggregate as an adsorbent for P removal and identify its P removal capacity. A series of batch tests showed that P removal capacity of EAF slag increases gradually with the increase of pH with a range of 2-10, while the highest P removal capacity (1.94 mg/g) can be obtained at pH 12. The adsorption kinetics of P on EAF slag can be described by pseudo-second-order kinetic equations. Isothermal adsorption simulations showed that the best fitted model was the Freundlich model with a correlation coefficient of 0.9825. A continuous flow column experiment feeding a synthetic influent containing 15 mg P/L was operated for 60 days and the P removal efficiency was greater than 95% with a P removal capacity of 1.6 mg P/g slag. The results obtained in this study showed that EAF slag could act as an efficient adsorbent for P removal. Calcium phosphate precipitation depends on the release of Ca and OH by the dissolution of calcium oxide in EAF slag was found to be the dominant removal mechanism for P removal.
电弧炉（EAF）炉渣骨料是钢铁行业的一种废副产品，具有很高的除磷潜力，引起了广泛关注。本研究的主要目的是评估 EAF 炉渣骨料作为除磷吸附剂的性能，并确定其除磷能力。一系列批处理实验表明，EAF 炉渣的除磷能力随 pH 值的增加而逐渐增加，范围为 2-10，而在 pH 12 时可获得最高的除磷能力（1.94mg/g）。P 在 EAF 炉渣上的吸附动力学可以用拟二级动力学方程来描述。等温吸附模拟表明，最佳拟合模型是 Freundlich 模型，相关系数为 0.9825。用含有 15mg P/L 的合成进水进行连续流柱实验运行 60 天，P 去除效率大于 95%，EAF 炉渣的除磷容量为 1.6mg P/g 炉渣。本研究结果表明，EAF 炉渣可用作高效除磷吸附剂。发现磷的去除主要机制是通过 EAF 炉渣中氧化钙的溶解释放 Ca 和 OH，形成磷酸钙沉淀。
