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- Title
Re-hydrolysis characteristics of alkaline fermentation liquid from waste activated sludge: Feasibility as a carbon source for nitrogen removal.
- Authors
Liu, Xuyan; Yang, Hong; Chang, Jiang; Bai, Yongsheng; Shi, Luyuan; Su, Bojun; Han, Jun; Liang, Duo
- Abstract
To overcome the issue of substandard nitrogen and phosphorus discharge, resulting from the low carbon/nitrogen (C/N) ratio of municipal wastewater, immobilized filler was used to re-hydrolyze the alkaline fermentation liquid of waste activate sludge (WAS) as a nitrogen removing carbon source. The complex organic matter was further hydrolyzed and its denitrification efficiency as a carbon source for nitrogen removal was improved. Volatile fatty acids increased from 1605 ± 5 mg/L to 2546 ± 37 mg/L after re-hydrolysis of mixed-alkali sludge fermentation liquid, and complex organic matter, such as fulvic acids, humic acids, class I aromatic proteins, and soluble microbial products were hydrolyzed into small-molecule organics. When the re-hydrolysis fermentation liquid (RH-SFL) was used as the carbon source for nitrogen removal, the nitrogen removal effect was close to sodium acetate and the nitrogen removal rate (NRR) was up to 98.5 ± 0.5%. According to the NO X --N removal curve, the reaction rate of RH-SFL was significantly higher than before re-hydrolysis (nRH-SFL) (0.486 > 0.38). This technology can significantly improve the effective organic quality in the alkaline fermentation liquid of WAS, which can be more easily utilized by denitrifying bacteria. This provides a feasible and effective solution for nitrogen removal in municipal wastewater with insufficient carbon. [Display omitted]
- Subjects
LIQUID waste; HYDROLYSIS; FERMENTATION; SODIUM acetate; NITROGEN removal (Sewage purification); NITROGEN; DENITRIFYING bacteria; HUMIC acid
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2022, Vol 165, p230
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2022.06.064