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Thermophilic and Mesophilic (Two‐Stage) Anaerobic Digestion
Author(s) -
Dichtl N.
Publication year - 1997
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1997.tb00098.x
Subject(s) - mesophile , anaerobic digestion , organic matter , chemistry , thermophile , biogas , anaerobic exercise , microorganism , digestion (alchemy) , pulp and paper industry , degradation (telecommunications) , retention time , food science , waste management , biology , chromatography , bacteria , methane , biochemistry , organic chemistry , physiology , telecommunications , genetics , computer science , engineering , enzyme
The objectives of sludge stabilization include (a) the degradation of organic matter, (b) a reduction of solid matter, (c) a decrease in the number of pathogenic organisms, (d) an improvement of dewaterability, and (e) the production of biogas. The anaerobic digestion of organic substances normally proceeds in four stages, and the various microorganisms which are involved in microbial metabolism have different ambient conditions for their optimum mode of operation. This can be achieved, for example, by splitting the process technique into two stages. In order to achieve disinfection, a primary thermophilic stage with 1–3 days’retention is followed by anaerobic degradation under mesophilic conditions having a retention period of 10–15 days. The combined retention period of about 15 days for this two‐stage combined sludge stabilization process is compared with the results of single‐stage mesophilic digestion with a retention period of 20 to 30 days.