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Table 1 Operating data of the investigated waste utilizing biogas plants

From: Foam formation in full-scale biogas plants processing biogenic waste

Biogas plant Substrate Organic loading rate Mode of operation Installed electric capacity Retention time Number of digesters Agitation
BP A 50 thousand t/a swine and cattle manure, 30 thousand t/a biogenic industrial wastes from trade and industries 2 to 2.5 kg VS/(m3 × day) Mesophilic, two-stage (with an upstream hydrolysis stage) 2× 469 kWel, (7.4 mil. kWhel/a) 25 days Two hydrolysis digesters (520 m3 each) 2× digesters (2,300 m3 each) Continuous stirring with two paddles
BP B 8.320 t/a commercial food waste, 3.070 t/a vegetable materials, 3.040 t/a grease separator contents and flotation tailings, 1.400 t/a pastry wastes, 170 t/a miscellaneous (dairy wastewater, potato wastes, old bread grain sieving wastes) 2.8 kg VS/(m3 × day) Mesophilic, one-stage 860 kWel 29 days Two digesters (1,000 m3 each) Recirculation and pneumatic
BP C Sewage sludge, approximately 480 to 640 t grease separator contents in December 2009 to March 2010 2.5 to 3 kg VS/(m3 × day) Mesophilic, one-stage No information 20 days Four digesters (8,000 m3 each) Recirculation
BP D 36.500 t/a wastes and sludge from potato processing 2.8 kg VS/(m3 × day) Thermophilic, one-stage 400 kWel; the biogas is burned and heat is used for the preparation of potato products 36 days One digester (3,600 m3) Recirculation
BP E 22.800 t/a grain waste products, 1.200 t/a grease separator contents No information Mesophilic, two-stage (with open mash and hydrolysis stage) No information 30 to 35 days One digester (5,000 m3) Hydraulic