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J Environ Manage. 2016 Jan 15;166:407-13. doi: 10.1016/j.jenvman.2015.10.037. Epub 2015 Nov 10.

Biological nitrate removal using a food waste-derived carbon source in synthetic wastewater and real sewage.

Author information

1
School of Environment, Tsinghua University, Beijing 100084, China.
2
School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Beijing 100084, China; Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing 100084, China. Electronic address: jianguoj@mail.tsinghua.edu.cn.

Abstract

The production of volatile fatty acids (VFAs) from food waste to improve biological nutrient removal has drawn much attention. In this study, acidogenic liquid from food waste was used as an alternative carbon source for synthetic wastewater treatment. C/N ratios of 5 and 6 were suitable for denitrification, and the change in acidogenic liquid composition had no negative effect on denitrification. The denitrification rates using optimal carbon-to-nitrate ratios of acidogenic liquid were more than 25 mg NO3-N/(gVSS·h). At the same time, acidogenic liquid was used to improve nutrient removal from summer and winter sewage. C/N ratios of 5 and 6 were acceptable for summer sewage treatment. Total nitrogen in the final effluent was less than 7 mg/L. Two additional hours were required for winter sewage treatment, and the C/N ratio had to be >6.

KEYWORDS:

Alternative carbon source; Carbon to nitrogen ratio; Denitrification; Food waste

PMID:
26547269
DOI:
10.1016/j.jenvman.2015.10.037
[Indexed for MEDLINE]

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