Interaction between Chlorella vulgaris and nitrifying-enriched activated sludge in the treatment of wastewater with low C/N ratio
Interaction between Chlorella vulgaris and nitrifying-enriched activated sludge in the treatment of wastewater with low C/N ratio
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DOI：
10.1016/j.jclepro.2019.119164
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发表时间：
2020-02-20
影响因子：
11.1
通讯作者：
Avateffazeli, Maryam
中科院分区：
文献类型：
--
作者：
Sepehri, Arsalan;Sarrafzadeh, Mohammad-Hossein;Avateffazeli, Maryam
基于藻类-细菌联合体的废水处理有望在其他生物过程中找到用途。在自养条件下，研究了普通小球藻（Chlorella vulgaris）和富硝化活性污泥（NAS）联合体接种比例对营养物去除、碳捕获和代谢物生成的影响。在含10% C. vulgaris: 90% NAS （w/w）的光生物反应器中，7天内最大NH4+-N去除率达到100%；这个联合体被称为B10。在纯培养14天后观察到最大PO43—P去除率（87.5%）。由于B10硝化速度快，实验结束时硝态氮积累值最高，为19.73 mg NO3—N/L。由于芥蓝的光合作用，B10中DO浓度达到4 mg/L，为NAS提供了适宜的条件。在所有试验配比中，B90 （90%:10% C. vulgaris/NAS, w/w）的碳捕获量最高（156 mg），而B10的碳捕获量仅为43.2 mg。此外，代谢物分析表明，培养物中草的比例与代谢物的产生呈正相关。在草和NAS共培养中观察到营养去除和碳捕获之间的权衡。总的来说，我们的研究表明，传统硝化过程中的曝气系统可以被基于微藻的更清洁的过程所取代，从而增强营养物质的去除，增加碳捕获，减少代谢物的产生，并减少多余污泥的产生。(C) 2019 Elsevier Ltd.版权所有。
Wastewater treatment based on algae-bacteria consortia is expected to find use among other biological processes. In this report, the effects of the inoculation ratios of a Chlorella vulgaris and nitrifier-enriched-activated-sludge (NAS) consortium on nutrient removal, carbon capture, and metabolite generation were investigated under autotrophic conditions. The maximum NH4+-N removal (100%) was observed within 7 days in a photo-bioreactor containing 10% C. vulgaris: 90% NAS (w/w); this consortium is referred to as B10. The maximum PO43--P removal (87.5%) was observed in a pure culture of C. vulgaris after 14 days. Due to the fast nitrification achieved using B10, this system showed the highest nitrate accumulation value of 19.73 mg NO3--N/L at the end of the experiment. The DO concentration in B10 reached 4 mg/L due to the photosynthetic activity of C. vulgaris, providing appropriate conditions for the NAS. Among all the tested consortium ratios, B90 (90%:10% C. vulgaris/NAS, w/w) showed the highest carbon capture (156 mg), while B10 captured only 43.2 mg of carbon. Furthermore, metabolite analysis showed a positive correlation between the proportion of C. vulgaris and the generation of metabolites in the cultures. A trade-off was observed between nutrient removal and carbon capture in C. vulgaris and NAS co-cultures. Overall, our study shows that the aeration system in conventional nitrification processes could be replaced by a cleaner process based on microalgae, resulting in enhanced nutrient removal, increased carbon capture, reduced metabolite generation, and a decrease in excess sludge production. (C) 2019 Elsevier Ltd. All rights reserved.