Abstract
The efficiency of anaerobic fermentation of waste activated sludge (WAS) under low-temperature condition is usually low. This work reported a new strategy to enhance the low-temperature fermentation of WAS by using aged refuse (AR), and explored the effect of initial pH 4 till pH 12 on the production of short-chain fatty acid (SCFA) from AR-enhanced sludge fermentation. The results showed that AR improved WAS fermentation under low-temperature condition (10 °C), and the maximum accumulation of SCFA was 75.6 ± 3.5 mg/g, which was significantly higher than that of the blank (without AR). In addition, when the initial pH was 7, the maximum yield of methane was 102.2 ± 4.8 mL/g, whereas when the initial pH was 11, the maximum yield of SCFA was 85.6 ± 2.8 mg/g. Weak acid or alkali pH benefited hydrolysis and acidification of WAS, but inhibited methanogenesis. The release of NH4+-N and phosphate in a strong alkaline environment (pH 11 and 12) was lower than that in other alkaline environments (pH 10).
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Acknowledgments
This research was financially supported by the project of the National Natural Science Foundation of China (NSFC) (No. 51908305). The project was funded by China Postdoctoral Science Foundation (2019M660162), the Open Project Fund of Qingdao University of Technology (QUTSEME201906), the Shandong Province Key Research and Development Program, China (2019GSF110005).
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Kuang, Y., Gao, Y., Zhang, J. et al. Effect of initial pH on the sludge fermentation performance enhanced by aged refuse at low temperature of 10 °C. Environ Sci Pollut Res 27, 31468–31476 (2020). https://doi.org/10.1007/s11356-020-09306-x
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DOI: https://doi.org/10.1007/s11356-020-09306-x