Effect of hydraulic load and C/N ratio on corn stalk solid carbon source SND treatment in low-city urban sewage

ZHANG Li-qiu, WANG Deng-min, LI Shu-geng, LYU Wei, HU Xue-liu, HE Pei-fen, LEI Zhi-juan

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Journal of Guangzhou University(Natural Science Edition) ›› 2018, Vol. 17 ›› Issue (3) : 69-75.

Effect of hydraulic load and C/N ratio on corn stalk solid carbon source SND treatment in low-city urban sewage

  • ZHANG Li-qiua,c, WANG Deng-mina,c, LI Shu-gengb,c, LYU Weia,c, HU Xue-liub,c, HE Pei-fenb,c, LEI Zhi-juan a,c
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Abstract

A solid carbon source biofilm reactor with corncob as filler was used to treat low C/N ratio wastewater by simultaneous nitrification and denitrification (SND) technology. The effect of different hydraulic loadings and C/N ratio on the denitrification effect of the system was investigated. The surface morphology of the corncobs was detected before and after the biofilm formation. The results show that the average removal rates of NH+4-N and TN are 92.16% and 91.18%, respectively, at the hydraulic loading of 0.045 m3·m-2·h-1. When the influent C/N ratio is controlled between 0 and 12, the effluent CODCr concentration is below 50 mg·L-1, and the average TN removal rate is above 79.63%. The denitrification effect increases with the increase of the C/N ratio. Scanning electron microscopy shows that corn cob is a better solid carbon source biofilm reactor packing, suitable for denitrification treatment of urban sewage with low carbon and nitrogen ratio.

Key words

solid carbon source / SND / hydraulic load / C/N ratio

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ZHANG Li-qiu, WANG Deng-min, LI Shu-geng, LYU Wei, HU Xue-liu, HE Pei-fen, LEI Zhi-juan. Effect of hydraulic load and C/N ratio on corn stalk solid carbon source SND treatment in low-city urban sewage. Journal of Guangzhou University(Natural Science Edition). 2018, 17(3): 69-75

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