Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 8, Pages 2657-2664Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.10.071
Keywords
Anaerobic co-digestion; Hygienization; Meat-processing by-products; Organic loading rate; Sewage sludge
Funding
- Maj and Tor Nessling Foundation
- European Union
- City of Mikkeli
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Anaerobic co-digestion of a mixture of animal by-products (ABP) from meat-processing industry and of sewage sludge was studied at 35 degrees C for co-digesting such by-products in digesters at wastewater treatment plants. The three reactors were fed with ABP mixture and sewage sludge (1) in a ratio of 1:7 (v/v), (2) in the same ratio but with hygienization (70 degrees C, 60 min) and (3) in a ratio of 1:3 (v/v). Hydraulic retention time (HRT) was decreased from 25 to 20 days and finally to 14 days, while organic loading rates (OLR) ranged from 1.8 to 4.0 kg VS/m(3) day. The highest specific methane yields were achieved with 20-days-HRT (1) 400 +/- 30, (2) 430 +/- 40, (3) 410 +/- 30 m(3) CH(4)/t VS. Hygienization improved methane production to a level above the highest OLR applied (feed ratio 1:3 (3)), while the quality of the digestate remained similar to the other reactors. (C) 2009 Elsevier Ltd. All rights reserved.
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