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Title: Quick-start of full-scale anaerobic digestion (AD) using aeration

Highlights: • A fast, and original, start up procedure for anaerobic digestors has been applied at full scale. • The development of a methanogenic culture has been documented using fluorescent in situ hybridization. • The technique can be widely applied. - Abstract: A conventional 1300 m{sup 3} continuously stirred anaerobic tank reactor at the city of Boden, north Sweden, which was receiving a feed of both sewage sludge and food waste, was put out of operation due to the build-up of a float phase. The reactor was emptied and cleaned. At start-up there was no methanogenic sludge available, so an unconventional start-up procedure was applied: The reactor was rapidly (8 days with 1200 kg of total solids (TS) added daily) filled with thickened, and slightly acidic sewage sludge, showing only slight methane generation, which was subsequently heated to 55 °C. Then compressed air was blown into the digester and within a month a fully functional methanogenic culture was established. The transfer from acidogenic to methanogenic conditions happened in about one week. As a start-up technique this is fast and cost efficient, it only requires the access of a compressor, electricity and a source of air. In total, about 16 tonnesmore » of oxygen were used. It is proposed that this method may also be used as an operational amendment technique, should a reactor tend to acidify.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
22470220
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 38; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AERATION; ANAEROBIC DIGESTION; COMPRESSED AIR; FLUORESCENCE; FOOD; IN-SITU HYBRIDIZATION; METHANE; OXYGEN; SEWAGE SLUDGE; SWEDEN; URBAN AREAS