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On-line Access: 2015-04-03

Received: 2014-04-17

Revision Accepted: 2014-12-10

Crosschecked: 2015-03-10

Cited: 4

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Citations:  Bibtex RefMan EndNote GB/T7714


Xiang Hu


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Journal of Zhejiang University SCIENCE B 2015 Vol.16 No.4 P.304-316


Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal

Author(s):  Fan Bu, Xiang Hu, Li Xie, Qi Zhou

Affiliation(s):  State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

Corresponding email(s):   xiangh1215@outlook.com

Key Words:  Biological nutrient removal (BNR), Denitrification, Enhanced biological phosphorus removal (EBPR), External carbon source

Fan Bu, Xiang Hu, Li Xie, Qi Zhou. Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal[J]. Journal of Zhejiang University Science B, 2015, 16(4): 304-316.

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%T Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal
%A Fan Bu
%A Xiang Hu
%A Li Xie
%A Qi Zhou
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%DOI 10.1631/jzus.B1400106

T1 - Cassava stillage and its anaerobic fermentation liquid as external carbon sources in biological nutrient removal
A1 - Fan Bu
A1 - Xiang Hu
A1 - Li Xie
A1 - Qi Zhou
J0 - Journal of Zhejiang University Science B
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.B1400106

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.


结论:(1)在整个试验过程中,与乙酸钠作为碳源相比,木薯酒糟及其厌氧发酵液在相同的运行条件下取得了更高的总氮(TN)去除率,分别为(72.4±3.2)%和(73.2±2.6)%,高于乙酸钠的(62.6±3.5)%。NUR试验结果表明,木薯酒糟及其厌氧发酵液污泥的反硝化速率分别为5.49~5.99 g N/(kg MLVSS·h)和6.63~6.81 g N/(kg MLVSS·h),与其他研究中报道的食品工业废水的反硝化速率相当或略高。(2)以木薯酒糟及其厌氧发酵液作为碳源的系统发生了显著的反硝化聚磷现象,两体系中的反硝化聚磷菌分别占总聚磷菌的62.6%(86天)和61.8%(65天)。(3)以木薯酒糟上清液及其厌氧发酵液作为碳源的生物营养盐去除(SBR)系统均取得了良好稳定的脱氮除磷效果。在BNR工艺中投加木薯酒糟及其厌氧碱性发酵液作为外加碳源,不仅可以提高系统氮磷去除效果,还能解决这部分废水的处理问题,是一种很有潜力的替代碳源。


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