廢굴껍질과 黃土로 製造한 凝集劑를 利用한 廢水處理에 관한 硏究
Study on the Wastewater Treatment as a Coagulant Using the Waste Oyster Shells and Loess
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본연구는수산폐기물인폐굴껍질과우리나라에넓게분포되어있는황토를이용하여응집제를제조하기위한것으로서응집제원료의성분조사결과, 폐굴껍질은 CaO 성분이 55.43(wt%) 로가장많이함유되어있었고, 황토는 SiO2가 45.30(wt%) 로주성분임을알수있었다. 폐굴껍질내의 CaO 순도를높이기위해 900oC에서 2시간동안소성하였으며, ball mill 을사용하여 0.074 mm(200 mesh) 로분쇄하였다. 소성된폐굴껍질분말과황토분말을각각 6 : 4, 7 : 3, 8 : 2, 9 : 1 의비율로혼합하여응집제를제조하였다. 또한제조된응집제와화학소석회와의비교실험을통해화학소석회의대체가능성을확인하였다.
Abstract
This study was performed to investigate removal efficiency of wastewater by the prepared coagulant using waste oyster shell and loess. Waste oyster shell and loess contain respectively high CaO(55.43% by weight), SiO2(45.30% by weight). Waste oyster shell was calcined to improve the purity of CaO at the calcination condition of 900oC for 2hours, and then crushed 0.074 mm(200 mesh) size by ball mill. Also, coagulant was prepared with calcined waste oyster shell and loess powder by hydration reaction. Calcined waste oyster shell and loess powder were combined with mixing ratio of 6 :4, 7 :3, 8 :2 and 9 :1. Though comparison experiment between prepared coagulant and chemical Ca(OH) 2, prepared coagulant was proved as having replaceable possibility of chemical Ca(OH)2 in wastewater treatment plant