普通小球藻
曝气
废水
硝化作用
自养
污水处理
活性污泥
化学
环境化学
代谢物
营养物
生物量(生态学)
食品科学
制浆造纸工业
藻类
生物
植物
环境工程
细菌
氮气
环境科学
生态学
生物化学
有机化学
工程类
遗传学
作者
Arsalan Sepehri,Mohammad‐Hossein Sarrafzadeh,Maryam Avateffazeli
标识
DOI:10.1016/j.jclepro.2019.119164
摘要
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.
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