안료제조공정시 배출되는 염화알루미늄 용액의 재활용에 관한 연구

Study of reuse of aluminum chloride(AlCl₃) solution from pigment process

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제품화시킨 염화알루미늄(AlCl₃) 용액과 현재 각 처리장에서 사용하고 있는 무기응집제(PAC. Alum)를 약품교반실험(Jar-test)을 통하여 응집효율을 비교하여 염화알루미늄(AlCl₃)용액에 대한 재활용 가치를 검토한 결론은 다음과 같다. 1. 안료제조 공정에서 배출되는 리 제거효율이 99.8% 이상으로 나타나 구리 (Cu) 성분 제거에 효과적인 것으로 나타났다. 2. 제품화 시킨 염화알루미늄 (AlCl₃) 용액파 우기응집제인 PAC(10%), Alum(8%) 파의 응 집실험에서 염색폐수 및 화학폐수에 대해서는 염화암루미늄(AlCl₃) 응집제가 PAC (10% ), 비하여 응집효율이 높게 나타났고, 피혁폐수의 경우 Alum(8%) 이 다소 폐수의 종류에 따라셔 응집효율이 다르게 나타나는 것으로 평가되었으나 비교적 염화암루미늄(AlCl₃) 응집제의 응접효율이 우수한 것으로 나타났다. 3, 제품화 사킨 염화암루미늄(AlCl₃) 응집제의 응집특성 실험결과 응집제 주입량 500 - 1,500mg/l 의 범위에서 주입량의 증가로 응집효율이 다소 증가하는 경향을 보이나 그 영향은 미미하였으며 동일 주입량에서 pH 변화에 따른 응집효율차이는 폐수의 종류에 따라서 다르게 나타나 폐수 성상에 따라 응집제 주입량 및 적절한 pH 를 선정하므로서 응집효율을 높일 수 있을 것으로 평가되였다.

With the comparision of coagulation efficiency through Jar- Test with the producted AlCl₃ solution and inorganic coagulants - PAC, Alum - which are using at the each wastewater treatment plant, the reuse value for AlCl₃ solution are concluded as follows: 1. The removal efficiency of copper in solution was higher than 99.8 % when the aluminum pieCes were added and reacted in the AlCl₃ solution from the pigment production process. Therefore, the AlCl₃ solution was effective to remove copper. 2. From the coagulation expcr'iments with the producted AlCl₃ solution and inorganic coagulants - PAC (10%), Alum (8%) - the coagulation efficiency of AlCl₃ was higher than that of inorganic coagulants - PAC (10%), Alum (8%) - for a dye and chemical plant wastewater. Wherease, Alum (8%) showed somewhat higher coagulation efficiency than that of AlCl₃ for a leather plant wastewater. It was evaluated that the coagulation efficiency depended on the kinds of wastewater. However, in general, the coagulation efficiency of AlCl₃ was superior to inorganic coagulants - PAC (10%), Alum (8%). 3. The coagulation efficiency tended to be increased with the increase of coagulant in the range of 500 - 1,500 (mg/l) from the characteristic experiment of producted AlCl₃ coagulant. hut the effect was insignificant. 4. Since the coagulation efficiency by the variety of pH at the same dosage was different at the different kinds of wasterwater. Therefore, it was conculded that the coagulation efficiency could be increased by the proper pH and coagulant dosage with the characteristic of wastewater.