期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 106, 期 -, 页码 26-36出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2015.10.027
关键词
Fluidized bed bioreactors; Process integration; Hydraulic retention time; Denitrifying phosphorus removal; Optimisation; Waste-water treatment
资金
- National High Technology Research and Development Program (863 Program) of China [2012AA063406]
- project of scientific research base and scientific innovation platform
- Thirteenth S&T Program for the Graduate Students of BJUT [ykj-2014-10614]
A modified two-sludge system consisting of AAO and BCO (Anaerobic anoxic oxic-biological contact oxidation) was developed. The unique advantage was the high efficient utilization of influent carbon sources in AAO reactor with NO3--N produced in BCO reactor, which achieved the simultaneous removal of both nitrogen and phosphorus. With real municipal wastewater at low carbon/nitrogen ratio (COD/TN = 3.50), the influence of hydraulic retention time (HRT = 6 - 12 h) in the AAO reactor on denitrifying phosphorus removal was observed. The mass balance analysis demonstrated that the system saved about 30-35% carbon sources compared with traditional biological nutrient removal (BNR) systems. HRT of 10 h was found to be optimal for denitrifying phosphorous removal due to the limitation of poly-beta-hydroxyalkanoates (PHA) utilization and denitrification capacity (NO3--N/PO43--P ratio). It was also determined that the NO3--N concentration of the middle settler should be kept around 1.50-2.50 mg/L to prevent secondary phosphorus release. Finally, anoxic duration and NO3--N loading were the major limiting factors for denitrifying phosphorus accumulation organisms (DNPAOs) growth. (C) 2015 Elsevier B.V. All rights reserved.
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