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KMID : 1156220090350010053
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Journal of Environmental Health Sciences
2009 Volume.35 No. 1 p.53 ~ p.57
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Chemical Coagulation Treatment Using Alum and PACl in Complex Wastewater
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Sung Il-Wha
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Abstract
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In order to treat the complex wastewater containing organic compound and solids, pre-treatment system associated with molecular separation process were investigated. The reductions of COD and turbidity were obtained after coagulation processes using Alum (Aluminium sulfate, Al₂(SO₄)₂ㆍ18H₂O) and PACl (poly aluminium chloride as 17% Al₂O₃). The results of study were as follows: using variable dosage of Alum, COD removal was highest at 4,000 ㎎/ℓ, and the reduction of COD and turbidity was 42% and 92%, respectively. The optimum coagulation would be effective at pH 7.3 than pH 9.0 by the addition of alum at a concentration of 6,000 ㎎/ℓ and PACl was add at 4.25% in raw complex wastewater with 2,000 ㎎/ℓ alum at pH 7.3, the reduction of COD was reduced by 32%. But coagulation aid experiments indicated that PACl would be more effective in sludge separation ability than COD removal efficiency.
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KEYWORD
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alum, chemical coagulation, complex wastewater, organic compound, PACl
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