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

机译:木薯釜病及其厌氧发酵液作为生物养分去除的外部碳源

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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.
机译:本研究的目的是探讨一种食品工业污水,木薯釜藻和厌氧发酵液的影响,厌氧 - 缺氧排序批量反应器(SBRS)中的城市废水中的生物营养去除(BNR)。用木薯釜内上清液及其厌氧发酵液进行实验,以及一种纯化合物(乙酸钠)作为外部碳源。循环研究表明,木薯副产物不仅影响了BNR过程中氮,磷,聚β-羟基烷烃(PHA)和糖原的转化,而且与乙酸钠相比,磷和氮的较高的去除效率。此外,磷积累生物(PAOS)和反硝化磷积聚生物(DPAOS)的测定证明,使用木薯釜馏物及其厌氧发酵液时,DPAOS对PAO的比例达到62.6%(第86天)和61.8%(第65天),分别作为外部碳源。此外,木薯副产物的硝酸盐利用率(Nurs)的范围为5.49-5.99g n /(kgmlvss≤h)(mlvss是混合液挥发悬浮固体)和6.63-6.81g n /(分别为kg mlvss?h)。 BNR性能的提高和待治疗的木薯釜量的减少使木薯釜病及其厌氧发酵液体有吸引力的乙酸钠作为BNR方法的外部碳源。

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