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- Title
Long-term prevention of organics dissolution from wastewater sludge treated with coal fly ash.
- Authors
Kuchar, Dalibor; Bednarik, Vratislav; Vondruska, Milan; Kojima, Yoshihiro; Onyango, Maurice S.; Matsuda, Hitoki
- Abstract
The present study is concerned with stabilization of wastewater sludge mixed with coal fly ash and carbon black for a treatment period ranging from 28 d to 2.5 years. To evaluate the stabilization degree of treated sludge, the dissolved organic carbon (DOC) of leachate from the sludge was measured. Results demonstrated that after 28 d of treatment, the DOC of the leachate was reduced from 2320 to 86 mg/L, when sludge was mixed with 45 wt% coal fly ash and 3 wt% carbon black. The DOC of the leachate after 1 year was higher than that after 28 d of treatment, which might be caused by decomposition of organic materials in the initial sludge. However, there was no appreciable difference in DOC values between 1 and 2.5 years treatment. It was concluded that organic materials were prevented from leaching out from the sludge by hydration products formed by coal fly ash and by carbon black adsorption.
- Subjects
INDUSTRIAL wastes; FLY ash; CARBON; SEWAGE sludge; CARBON compounds; LEACHATE
- Publication
Journal of Environmental Engineering & Science, 2006, Vol 5, Issue 5, p429
- ISSN
1496-2551
- Publication type
Article
- DOI
10.1139/S06-010