납석을 이용한 하수 중의 인제거

Abstract

Recently, the concentration criteria of phosphorus in domestic wastewater has been greatly reduced to 0.2 ~ 0.5 mg/L. This will cause problems with the removal of phosphorus and Anoxic-oxic activated sludge at existing wastewater facilities because of seasonal factors and stronger regulations. In order to solve this problem, physical and chemical phosphorus removal by coagulant should be used. However, there may be many problems with phosphorus removal by these coagulants (flocculent, THM, etc.) including the creation of sludge, which would be an economical problem. One way to solve these problems is the use of a natural coagulant. In this paper, the phosphorus removal mechanism from domestic wastewater using pyrophyllite was investigated. In this experiment, pyrophyllite with a particle size of 840 ~ 1300 ㎛ and pyrophyllite with a particle size less than 420 ㎛ were treated at different temperatures (100℃ ~ 900℃). The experiment showed that pyrophyllite treated at 600℃ with a particle size of 840 ~ 1300 ㎛ had a higher phosphorus removal efficiency and pyrophyllite with a particle size less than 420 ㎛ should also have a high removal efficiency without heat treatment. The removal efficiency of phosphorus was influenced by pH range and the efficiency was higher in higher pH conditions. The removal efficiency of phosphorus increased with increasing adsorbent dosage with respect to a phosphorus source of a low concentration PO4-P solution. In the continuous experiments, pyrophyllite with a particle size of 840 ~ 1300 ㎛ removed the 1,800 mL PO4-P solution in 10 mL/min and the 1,500 mL PO4-P solution in 20 mL/min. The process of uptake obeys both Langmuir and Freundlich isotherms. Batch adsorption studies have shown that the adsorption reaction could be described by the second-order reversible reaction.