A comparative study of anaerobically digested and undigested sewage sludges in preparation of activated carbons

Citation
Jh. Tay et al., A comparative study of anaerobically digested and undigested sewage sludges in preparation of activated carbons, CHEMOSPHERE, 44(1), 2001, pp. 53-57
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
CHEMOSPHERE
ISSN journal
0045-6535 → ACNP
Volume
44
Issue
1
Year of publication
2001
Pages
53 - 57
Database
ISI
SICI code
0045-6535(200107)44:1<53:ACSOAD>2.0.ZU;2-K
Abstract
Disposal of sewage sludge is an increasingly expensive and environmentally sensitive problem throughout the world. Preparation of activated carbon fro m sewage sludge offers an attractive re-use alternative to the traditional disposal routes. The objective of this research work was to compare anaerob ically digested sewage sludge (DS) and undigested sewage sludge (US) as sou rce materials in the preparation of activated carbons. Prior to the prepara tion the properties of the two types of sewage sludges were determined and compared. Subsequently the sludge samples were activated with 5 M ZnCl2 sol ution and thereafter pyrolysed at heating temperature of 650 degreesC for 2 h with the heating rate of 15 degreesC/min under a nitrogen atmosphere. Th e produced activated carbons were characterised by surface area and porosit y analysis, CHN elemental composition and ash contents determination, and a queous phase phenol adsorption tests. The results indicate that in comparis on with the DS, the US had a higher carbon content and lower ash content, a nd accordingly yielded a better activated carbon with a higher BET surface area, pore volume, carbon content and phenol adsorption capacity. (C) 2001 Elsevier Science Ltd. All rights reserved.