Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 10, Pages 9095-9101Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02009
Keywords
Layered double hydroxides; Carbon source; Slow release; Organic waste; Denitrification
Categories
Funding
- National Natural Science Foundation of China [21377079, 51578329]
- Science and Technology Commission of Shanghai Municipality [16010500200]
- Program for Innovative Research Team in University [IRT13078]
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Short-chain fatty acids (SCFAs) were extracted from artificial and actual anaerobic fermentation liquid of organic waste via the synthesis of layered double hydroxides (LDHs), which was then used as external carbon source in biodenitrification process. Results of X-ray diffraction and Fourier transform infrared analysis indicate that SCFAs were successfully intercalated into LDHs in both artificial system and actual anaerobic fermentation liquid of food waste, with good slow release performance. When using SCFAs-LDH and SCFAs-Na as carbon source with COD/N ratio of 4:1, the nitrate removal efficiency and the utilization efficiency of carbon source were improved from 42.3% and 30.3% to 81.3% and 58.1%, respectively. A dynamic release-utilization balance of carbon source was always kept during denitrification process when using SCFAs-LDH, so that higher removal efficiency of nitrate and utilization efficiency of carbon source were obtained simultaneously. This study could help to recover SCFAs from organic wastes efficiently as a denitrification carbon source with slow release performance.
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