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Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

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Abstract

Plant waste (PW) and excess sludge (ES) are two main organic matters of municipal solid waste. However, there are few reports on their anaerobic co-digestion. In this work, the mixed proportion of PW and ES anaerobic co-digestion was first optimized at mesophilic temperature, and then the anaerobic co-digestion of PW and ES was enhanced with strong oxidant calcium peroxide (CP). The results showed that the optimal mixing ratio of PW and ES was 1/1 (in terms of volatile solids), the C/N of mixed digestion substrate was 23.5/1, and the maximum methane production was 172.6 mL/g (in terms of volatile solids). CP could enhance methane production from anaerobic co-digestion of PW and ES. When the content of CP was 0.2 g/g (in terms of total suspended solids), the maximum methane production was 234.8 mL/g, about 1.4 times of the blank. The mechanism investigation showed that CP promoted the release of organic matter during the co-digestion, and the higher the content of CP, the greater the release of soluble chemical oxygen demand. The presence of appropriate amount of CP promoted the activities of key enzymes in anaerobic fermentation process, and then increased the efficiency of methane production. The results of this work provide an alternative strategy for the resource utilization of PW and ES.

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All data generated or analyzed during this study are included in this published article and its supplementary information files.

Funding

This work was financially supported by the special project of talent introduction of Hebei Agricultural University (YJ2020043).

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YW conducted the experiment and wrote the original manuscript. XHZ analyzed the experimental results and reviewed the manuscript. BD reviewed the manuscript. XQZ supported the experiment and reviewed the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yongliang Wang.

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The authors declare that they have no conflict of interest.

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Responsible Editor: Ta Yeong Wu

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Wang, Y., Zhou, X., Dai, B. et al. Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide. Environ Sci Pollut Res 28, 47540–47549 (2021). https://doi.org/10.1007/s11356-021-14055-6

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  • DOI: https://doi.org/10.1007/s11356-021-14055-6

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