입도, 교반강도 그리고 표면개질이 EAFRS를 이용한 CSOs의 인 흡착특성에 미치는 영향

Abstract

First flush having non-point pollutants have been increasing due to the increase in impermeable area by urbanization and industrialization, and there is a real difficulty in river water quality management due to CSOs and first flush. The purpose of this study is to optimize the phosphorus adsorption process using EAFRS as an adsorbent to improve the phosphorus reduction efficiency of CSOs. During the phosphorus adsorption reaction, the optimum conditions for the phosphorus adsorption process were derived by investigating the amount of phosphorus removal according to the slag particle size, surface modification and mixing intensity. According to the study, the smaller the slag particle size, the higher the phosphorus adsorption efficiency, and difference in phosphorus removal efficiency between the surface-modified slag using iron salts and the non-modified slag was not large as to whether surface was modified, But It was judged that iron ions and phosphorus prefer to bond more than that of phosphorus and calcium in surface modified slag. Under the mixing conditions with ceramic balls, the phosphorus removal rate tended to increase significantly, thus mixing method was judged to be a major factor in increasing the phosphorus adsorption efficiency. Lastly, FE-SEM, XRD and FT-IR analysis were performed to investigate the changes in the microstructure and chemical characteristics of the slag before and after phosphorus adsorption.