Abstract:
:Anaerobic co-digestion of a mixture of animal by-products (ABP) from meat-processing industry and of sewage sludge was studied at 35 degrees Celsius 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 Celsius, 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 + or - 30, (2) 430 + or - 40, (3) 410 + or - 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.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Luste S,Luostarinen Sdoi
10.1016/j.biortech.2009.10.071subject
Has Abstractpub_date
2010-04-01 00:00:00pages
2657-64issue
8eissn
0960-8524issn
1873-2976pii
S0960-8524(09)01447-3journal_volume
101pub_type
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