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KMID : 0382420000260020030
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 2 p.30 ~ p.33
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The Characteristics of Municipal Wastewater Sludge Dewatering Using Oyster Shell Powder
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Shin Nam-Chul
Moon Jong-Ik
Sung Nak-Chang
Jung Yu-Jin
Jang Hye-Jung
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Abstract
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The objective of this study is to examine the substitution effect of the waste oyster shell powder as the conditioning agent in municipal wastewater sludge dewatering process. Because the oyster shells have a large amount(about 38% by weight) of alkaline minerals, such as calcium and magnesium, they are thought to have the potential as a good conditioning agent. In this study, the physico-chemical properties of powdered oyster shells(75㎛ or 200 mesh) and the dewatering characteristics of municipal waste water sludge using powdered oyster shells and CaCO_3 are investigated. The conclusions are as follows, 1. Oyster shell could produce calcium ions up to 14ppm at pH = 7.0, and this represents that oyster shell is a potential properties as a good conditioner. 2. 100 ㎖ of wastewater sludges, conditioned with pretreated oyster shell, are dewatered to the level of 25% solid concentration. 3. Wastewater sludges, conditioned with oyster shell and CaCO_3 are dewatered to the level of 32% solid concentration. And this shows that two-stage combined conditioning process is desirable than the one-stage conditioning process.
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