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Effects of Biocarrier Type and Size on the Performance of Nitrification and Simultaneous Nitrification and Denitrification by Wen Shi; Zhe Tian; Yun Wang; Bo Yu; Ye Tian; Min Yang is a Environmental Science article available to read on EtoBox.

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Four soft polyurethane biocarriers with different sizes and a hard polypropylene biocarrier were selected to evaluate the effects of material type and size on the nitrification and simultaneous nitrification and denitrification (SND) performance of the aerobic moving bed biofilm reactors (MBBR) in treating synthetic coking wastewater under different organic loading rates (OLR, 0.95, 0.65, 0.49 kg COD m−3 day−1). The attached biomass concentrations of the polyurethane biocarriers were 1.65 ± 0.15 g L−1, almost twice that of the polypropylene one (0.76 ± 0.05 g L−1), while the differences in the suspended biomass concentrations were relatively small (1.48 ± 0.18 g L−1 and 1.28 ± 0.06 g L−1, respectively). The SND efficiency of 32.43% ± 5.15% for all five MBBRs was achieved at an OLR of 0.95 kg COD m−3 d−1, which decreased to 8.48% ± 5.25% and 4.35% ± 2.99%, respectively, at lower OLRs. It was clear that OLR was an important factor affecting the SND performance. The MBBR using the smallest polyurethane biocarrier (10 mm × 10 mm × 10 mm) achieved complete nitrification at an OLR of 0.65 kg COD m−3 day−1, while the other ones achieved it at a lower OLR (0.49 kg COD m−3 day−1). The small

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Author

Wen Shi; Zhe Tian; Yun Wang; Bo Yu; Ye Tian; Min Yang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)