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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2015, Vol. 16 Issue (4): 304-316    DOI: 10.1631/jzus.B1400106
Articles     
Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal
Fan Bu, Xiang Hu, Li Xie, Qi Zhou
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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Abstract  The aim of this study was to investigate the effects of one kind of food industry effluent, cassava stillage and its anaerobic fermentation liquid, on biological nutrient removal (BNR) from municipal wastewater in anaerobic-anoxic-aerobic sequencing batch reactors (SBRs). Experiments were carried out with cassava stillage supernatant and its anaerobic fermentation liquid, and one pure compound (sodium acetate) served as an external carbon source. Cyclic studies indicated that the cassava by-products not only affected the transformation of nitrogen, phosphorus, poly-β-hydroxyalkanoates (PHAs), and glycogen in the BNR process, but also resulted in higher removal efficiencies for phosphorus and nitrogen compared with sodium acetate. Furthermore, assays for phosphorus accumulating organisms (PAOs) and denitrifying phosphorus accumulating organisms (DPAOs) demonstrated that the proportion of DPAOs to PAOs reached 62.6% (Day 86) and 61.8% (Day 65) when using cassava stillage and its anaerobic fermentation liquid, respectively, as the external carbon source. In addition, the nitrate utilization rates (NURs) of the cassava by-products were in the range of 5.49–5.99 g N/(kg MLVSS⋅h) (MLVSS is mixed liquor volatile suspended solids) and 6.63–6.81 g N/(kg MLVSS⋅h), respectively. The improvement in BNR performance and the reduction in the amount of cassava stillage to be treated in-situ make cassava stillage and its anaerobic fermentation liquid attractive alternatives to sodium acetate as external carbon sources for BNR processes.

Key words： Biological nutrient removal (BNR)      Denitrification      Enhanced biological phosphorus removal (EBPR)      External carbon source     
Received: 17 April 2014      Published: 03 April 2015
CLC:  X52  
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Fan Bu
Xiang Hu
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Qi Zhou
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Fan Bu, Xiang Hu, Li Xie, Qi Zhou. Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2015, 16(4): 304-316.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1400106     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2015/V16/I4/304

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