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Frontiers of Environmental Science & Engineering

Front.Environ.Sci.Eng.    2014, Vol. 8 Issue (4) : 598-606
Performance of a hybrid anaerobic-contact oxidation biofilm baffled reactor for the treatment of decentralized molasses wastewater
Minmin LIU1,2,Ying ZHAO2,*(),Beidou XI2,*(),Li’an HOU1,Xunfeng XIA2
1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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A novel hybrid anaerobic-contact oxidation biofilm baffled reactor (HAOBR) was developed to simultaneously remove nitrogenous and carbonaceous organic pollutants from decentralized molasses wastewater in the study. The study was based on the inoculation of anaerobic granule sludge in anaerobic compartments and the installation of combination filler in aerobic compartments. The performance of reactor system was studied regarding the hydraulic retention time (HRT), microbial characteristics and the gas water ratio (GWR). When the HRT was 24h and the GWR was 20:1, total ammonia and chemical oxygen demand (COD) of the effluent were reduced by 99% and 91.8%, respectively. The reactor performed stably for treating decentralized molasses wastewater. The good performance of the reactor can be attributed to the high resistance of COD and hydraulic shock loads. In addition, the high solid retention time of contact oxidation biofilm contributed to stable performance of the reactor.

Keywords combination filler      contact oxidation biofilm      food wastewater      anaerobic baffled reactor     
Corresponding Authors: Ying ZHAO   
Issue Date: 11 June 2014
 Cite this article:   
Minmin LIU,Ying ZHAO,Beidou XI, et al. Performance of a hybrid anaerobic-contact oxidation biofilm baffled reactor for the treatment of decentralized molasses wastewater[J]. Front.Environ.Sci.Eng., 2014, 8(4): 598-606.
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Minmin LIU
Beidou XI
Li’an HOU
Xunfeng XIA
Fig.1  The schematic diagram of the HAOBR; (b) the picture of the filler

feed tank (50L), (B) peristaltic pump, (C) gas outlet, (D) baffled reactor (21.6L), (E) water sampling port, (F) aeration device, (G) the water tank, (H) sludge sampling port

density/(g·cm-3)diameter of silk/mmporosity/%specific surface area/(m2·m-3)installation method
Tab.1  Characteristics of the combination filler
Tab.2  Recipe for simulated wastewater
operation stageHRT/hinfluent COD/(mg·L-1)COD loading rate/(kg COD·m-3·d-1)
1st stage (1-47d)4830001.5
2nd stage( 49-71d)3630002
3rd stage (73-93d)2430003
4th stage (95-119d)2030003.6
5th stage (121-145d)1430005
6th stage (147-167d)1230006
7th stage (169-189d)1030007.2
8th stage (191-207d)106001.44
9th stage (209-221d)1030007.2
Tab.3  the operational parameter of HAOBR
Fig.2  (a) The effluent COD concentrations in different anaerobic compartments and total COD removal efficiency in HAOBR; (b) COD removal efficiencies in different anaerobic compartments of HAOBR.
HRT/hCOD of each compartment/(mg·L-1)COD removal of each compartment/%
Tab.4  COD and COD removal efficiency of each compartment at different HRT
Fig.3  (a) The VSS/SS ratio of anaerobic granule sludge in each anaerobic compartment at various OLRs; (b) distribution of granular size of the granule sludge in anaerobic compartments
Fig.4  Scanning electron microscopy (SEM) photographs of bacteria at different anaerobic compartments (a) the first anaerobic compartment; (b) the second anaerobic compartment; (c) the third anaerobic compartment; (d) the forth anaerobic compartment
Fig.5  Variation of removal efficiencies of (a) COD; (b) ammonia at the gas/water ratio of 17, 18, 19 and 20
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