利用废弃活性污泥发酵生物生产挥发性脂肪酸用于原位反硝化。
Bioproduction of volatile fatty acid from the fermentation of waste activated sludge for in situ denitritation.
作者信息
Wang Bo, Peng Yongzhen, Guo Yuanyuan, Wang Shuying
机构信息
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
出版信息
J Biosci Bioeng. 2016 Apr;121(4):431-4. doi: 10.1016/j.jbiosc.2015.08.007. Epub 2015 Oct 21.
Waste activated sludge (WAS) fermentation integrated with denitritation (the reduction of nitrite to dinitrogen gas) at different pHs was investigated in batch-mode reactors over a 24-day period. The results showed that in comparison with controlled pHs, the volatile fatty acid (VFA) bioproduction for in situ denitritation was significantly improved at uncontrolled pH. VFA fermented from WAS was quickly consumed by denitritation at uncontrolled pH, which accelerated sludge degradation. On the other hand, sludge digestion was benefited from the alkalinity produced from denitritation, while methanogenesis was prohibited by alkalinity and nitrite. The integrated sludge fermentation and denitritation can be cost-effectively applied to wastewater treatment plants, so that organic substrates (e.g., VFAs) are produced for denitritation via simultaneous sludge fermentation, which enables WAS reutilization and enhances nitrogen removal efficiency without the need of external carbon sources.
在间歇式反应器中，对不同pH值下废活性污泥（WAS）发酵与反硝化作用（将亚硝酸盐还原为氮气）进行了为期24天的研究。结果表明，与控制pH值相比，在未控制pH值的情况下，原位反硝化作用的挥发性脂肪酸（VFA）生物产量显著提高。在未控制pH值的情况下，由WAS发酵产生的VFA被反硝化作用迅速消耗，这加速了污泥的降解。另一方面，污泥消化受益于反硝化作用产生的碱度，而甲烷生成则受到碱度和亚硝酸盐的抑制。污泥发酵与反硝化作用的整合可以经济高效地应用于污水处理厂，从而通过同时进行污泥发酵产生用于反硝化作用的有机底物（如VFA），这使得WAS得以再利用，并在无需外部碳源的情况下提高脱氮效率。
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