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Batchwise mesophilic anaerobic co-digestion of secondary sludge from pulp and paper industry and municipal sewage sludge.

Authors :
Hagelqvist A
Source :
Waste management (New York, N.Y.) [Waste Manag] 2013 Apr; Vol. 33 (4), pp. 820-4. Date of Electronic Publication: 2013 Jan 05.
Publication Year :
2013

Abstract

Residues from forest-industry wastewater-treatment systems are treated as waste at many pulp and paper mills. These organic substances have previously been shown to have potential for production of large quantities of biogas. There is concern, however, that the process would require expensive equipment because of the slow degradation of these substances. Pure non-fibrous sludge from forest industry showed lower specific methane production during mesophilic digestion for 19days, 53±26 Nml/g of volatile solids as compared to municipal sewage sludge, 84±24 Nml/g of volatile solids. This paper explores the possibility of using anaerobic co-digestion with municipal sewage sludge to enhance the potential of methane production from secondary sludge from a pulp and paper mill. It was seen in a batch anaerobic-digestion operation of 19 days that the specific methane production remained largely the same for municipal sewage sludge when up to 50% of the volatile solids were replaced with forest-industry secondary sludge. It was also shown that the solid residue from anaerobic digestion of the forest-industry sludge should be of suitable quality to use for improving soil quality on lands that are not used for food production.<br /> (Copyright © 2012 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1879-2456
Volume :
33
Issue :
4
Database :
MEDLINE
Journal :
Waste management (New York, N.Y.)
Publication Type :
Academic Journal
Accession number :
23294534
Full Text :
https://doi.org/10.1016/j.wasman.2012.11.002