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Title: | Stabilization/solidification of sludge by means of coal fly ash as a binder | ||||||||||
Author: | Kuchař, Dalibor; Vondruška, Milan; Bednařík, Vratislav; Kojima, Yoshihiro; Matsuda, Hitoki | ||||||||||
Document type: | Peer-reviewed article (English) | ||||||||||
Source document: | Environment Protection Engineering. 2005, vol. 31, issue 2, p. 33-45 | ||||||||||
ISSN: | 0324-8828 (Sherpa/RoMEO, JCR) | ||||||||||
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Abstract: | The paper focuses on determining the additives being suitable for stabilization/solidification of sludge (produced during wastewater treatment) by fly ash. Fly ash, fly ash with Portland cement, and fly ash with lime were tested as the binders. Different quantities of Portland cement or lime added to fly ash as a binder were mixed with sludge produced during wastewater treatment. Carbon black was added to the mixture of the sludge with a binder in 1, 2, 3 wt% to reduce DOC (dissolve organic carbon) leachability. The prepared mixtures were left in laboratory conditions for 28 days to solidify. Then the effectiveness of sludge stabilization was evaluated by water-leaching test carried out on specimens according to Czech regulations. The specimens in distilled water of the water/solid ratio of 10/1 were mixed together and shaken for 24 hours. Due to high content of organic compounds in the sludge, the DOC content in water leachate was chosen as a relevant criterion. Stabilization/solidification of sludge by means of fly ash decreased the leachability of DOC from 2,320 mg/dm3 to 164 mg/dm3 in water leachate of a mixture with 40 wt% of sludge. Addition of a carbon black (1 wt%) decreased the leachability of DOC by almost three times (61 mg/dm3 for the mixture with 40 wt% of sludge). Addition of Portland cement or lime to fly ash did not give any remarkable effect on the decrease in DOC leachability from wastewater sludge. | ||||||||||
Full text: | http://epe.pwr.wroc.pl/2005/Kuchar_2-2005.pdf | ||||||||||
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