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Treatment of food processing wastewater in a full-scale jet biogas internal loop anaerobic fluidized bed reactor

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Abstract

A full-scale jet biogas internal loop anaerobic fluidized bed (JBILAFB) reactor, which requires low energy input and allows enhanced mass transfer, was constructed for the treatment of food processing wastewater. This reactor has an active volume of 798 m3 and can treat 33.3 m3 wastewater per hour. After pre-treating the raw wastewater by settling, oil separating and coagulation-air floating processes, the reactor was operated with a relatively shorter start-up time (55 days). Samples for the influent and effluent of the JBILAFB reactor were taken and analyzed daily for the whole process including both the start-up and stable running periods. When the volumetric COD loading fluctuated in the range of 1.6–5.6 kg COD m−3 day−1, the COD removal efficiency, the volatile fatty acid(VFA)/alkalinity ratio, the maximum biogas production and the content of CH4 in total biogas of the reactor were found to be 80.1 ± 5%, 0.2–0.5, 348.5 m3 day−1 and 94.5 ± 2.5%, respectively. Furthermore, the scanning electron microscope (SEM) results showed that anaerobic granular sludge and microorganism particles with biofilm coexisted in the reactor, and that the bacteria mainly in bacilli and cocci were observed as predominant species. All the data demonstrated that the enhanced mass transfer for gas, liquid and solid phases was achieved, and that the formation of microorganism granules and the removal of inhibitors increased the stability of the system.

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Acknowledgments

The authors express their thanks to the Hi-Tech Research and Development Program of China (No. 2009AA06Z319), the National Key Technology R&D Program of China (No. 2008BAC32B06-1) and the Natural Science Foundation of Guangdong Province (No. 2009B020311001) for financial support.

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Authors and Affiliations

  1. College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, People’s Republic of China

    Chaohai Wei, Tao Zhang, Chunhua Feng, Haizhen Wu, Zhiyi Deng, Chaofei Wu & Bin Lu

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  1. Chaohai Wei
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  2. Tao Zhang
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  3. Chunhua Feng
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  4. Haizhen Wu
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  5. Zhiyi Deng
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  6. Chaofei Wu
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  7. Bin Lu
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Correspondence to Chaohai Wei.

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Wei, C., Zhang, T., Feng, C. et al. Treatment of food processing wastewater in a full-scale jet biogas internal loop anaerobic fluidized bed reactor. Biodegradation 22, 347–357 (2011). https://doi.org/10.1007/s10532-010-9405-5

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  • DOI: https://doi.org/10.1007/s10532-010-9405-5

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