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Optimisation of anaerobic/anoxic/oxic process to improve performance and reduce operating costs
Author(s) -
Peng Yongzhen,
Wang Xiaolian,
Wu Weimin,
Li Jun,
Fan Jie
Publication year - 2006
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1573
Subject(s) - anoxic waters , denitrifying bacteria , aeration , effluent , anaerobic exercise , denitrification , wastewater , environmental science , environmental engineering , nitrate , phosphorus , pulp and paper industry , chemistry , environmental chemistry , nitrogen , biology , engineering , physiology , organic chemistry
A laboratory‐scale anaerobic/anoxic/oxic reactor system was used to treat synthetic brewery wastewater for 1 year. The objectives were to enhance denitrifying phosphorus removal, improve biological nutrient removal and reduce operating costs. Three operational strategies were tested: (1) controlling nitrate recirculation to stimulate the growth of denitrifying phosphate‐accumulating organisms; (2) adjusting the volume ratio of the anaerobic/anoxic/oxic zones to enhance anoxic P uptake; (3) bypassing a part of the influent flow into the anoxic zone to maximise anoxic P uptake and denitrification. The results showed that not only was anoxic P uptake enhanced but also energy consumption for aeration could be reduced when the anoxic effluent NO 3 − ‐N concentration was controlled between 1 and 3 mg L −1 . The optimal volume ratio of the anaerobic/anoxic/aerobic zones in this system was found to be 1:1:2. The optimal bypass flow ratio was 0.32. The results indicated that the optimal strategies could improve treatment performance and reduce operational costs, but there was still a challenge to treat wastewater with low C/N ratio. Copyright © 2006 Society of Chemical Industry