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Granulation of Non-filamentous Bulking Sludge Directed by pH, ORP and DO in an Anaerobic/Aerobic/Anoxic SBR

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Abstract

In an anaerobic/aerobic/anoxic (A/O/A) sequencing batch reactor (SBR), non-filamentous bulking sludge granulated after the adjustment of cycle duration and influent composition directed by pH, oxidation-reduction potential (ORP) and dissolved oxygen (DO). The turning points and plateaux of pH, ORP and DO profiles indicated the end of biochemical reactions, such as chemical oxygen demand (COD) consumption, P release, ammonium oxidation, P uptake and denitrification. The difference of nutrient concentration between the beginning and turning points represented the actual treatment capability of the sludge. Non-filamentous bulking with SVI30 of 255 mL g−1 resulted in a huge biomass loss. After regulation, the cycle duration was shortened from 310 to 195 min without unnecessary energy input. In addition, the settling ability was obviously improved as SVI30 reduced to 28 mL g−1. Moreover, matured granules with an average diameter of 600 μm were obtained after 45 days, and simultaneous COD, ammonium and phosphate (P) removal was also realized after granulation.

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Acknowledgments

This work was financially supported by Open Project of State Key Laboratory of Urban Water Resource and Environment (Grant No. ESK201301) and the Fundamental Research Funds for the Central Universities.

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  1. Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, #2 Linggong Road, Dalian, 116024, China

    Cuiya Zhang, Hanmin Zhang & Fenglin Yang

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  1. Cuiya Zhang
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  2. Hanmin Zhang
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Correspondence to Hanmin Zhang.

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Zhang, C., Zhang, H. & Yang, F. Granulation of Non-filamentous Bulking Sludge Directed by pH, ORP and DO in an Anaerobic/Aerobic/Anoxic SBR. Appl Biochem Biotechnol 178, 184–196 (2016). https://doi.org/10.1007/s12010-015-1867-9

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  • DOI: https://doi.org/10.1007/s12010-015-1867-9

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