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Promotion and inhibition of oxygen transfer under fine bubble aeration by activated sludge
Author(s) -
Fan Haitao,
Qi Lu,
Liu Guohua,
Zhang Yuankai,
Chen Xulu,
Wang Hongchen
Publication year - 2014
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/wej.12061
Subject(s) - activated sludge , aeration , mixed liquor suspended solids , chemistry , wastewater , mass transfer , pulp and paper industry , volatile suspended solids , sewage treatment , suspended solids , chromatography , environmental engineering , waste management , environmental science , organic chemistry , engineering
The promotion and inhibition of inactivated and activated sludge on oxygen mass transfer ( OMT ) were studied using lab‐scale experiments. The results showed that the α‐values and oxygen transfer efficiency ( OTE ) decreased with increasing mixed liquor suspended solids ( MLSS ) concentration (1–10 g/L). Although OMT promotion rate by microbial respiration in activated sludge system increased from 39.8–97.5% for the α‐values and OTE , the two parameters were found to fall sharply when MLSS concentration was over 5 g/L. This indicated that the sludge concentration is a major influence factor on OMT in activated sludge system. Such results provide valuable knowledge for the operating optimization of the aeration system in wastewater treatment process.