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KMID : 1156220090350010058
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Journal of Environmental Health Sciences
2009 Volume.35 No. 1 p.58 ~ p.63
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The Effect of the Use of Sodium Hypochlorite and Iron Salts on Sewage Sludge Dewaterability
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Sung Il-Wha
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Abstract
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This study investigated improvement to sludge dewaterability and coagulation for sewage treatment plant sludge by using sodium hypochlorite solution (NaOCl). ferric sulfate [Fe₂(SO₄)₃] andzeolite. The specific resistance to filtration(SRF), chloride, pH and turbidity were used to evaluate the sludge dewatering behaviors. The results of study were as follows: By varying the amount of NaOCl added the optimum result in terms of enhancement for pretreatment occurred when 34 ㎎/ℓ of NaOCl was injected. When the total solids concentration of the sludge was 10,000 ㎎/ℓ, the optimum ferric sulfate dosage for the sludge dewaterability was 150 ㎎/ℓ and the corresponding SRF was 1.7×10? sec²/g. It was observed that injecting zeolite into sludge was effective in improving the dewaterability of sludge.
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KEYWORD
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dewaterability, sewage sludge, sodium hypochlorite solution, zeolite
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