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Influence of reusable polypropylene packing on ammonia and greenhouse gas emissions during sewage sludge composting—a lab-scale investigation

  • Physical, Chemical and Biological Process Techniques and Tools for Pollution Prevention and Sustainability
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Abstract

Bulking agents are particularly important for sewage sludge composting. In this study, reusable polypropylene packing (RPP) was mixed with sawdust to improve composting. The effect of the mix ratio of sawdust and RPP on the physicochemical characteristics, nitrogen transformation, and emissions of greenhouse gas (GHG) as well as differences in the germination index values was detected in a lab-scale composting experiment. The results showed that the unique use of RPP as a bulking agent increased the moisture content over 70%, which resulted in poorer porosity and a less efficient O2 utilization environment and thus suppressed the degradation of organic matter. The highest CH4 9275.8 mg and lowest CO2 202.6 g emissions were detected after 25 days of composting in the treatment with RPP used as a bulking agent. When the mixing ratio of sawdust and RPP was 1:1, the temperature, oxygen supply, and dissolved organic carbon degradation were improved. The NH3, N2O, and CH4 emissions were reduced by 32.2, 18.3, and 90.7% compared with a treatment with RPP as a unique bulking agent. The RPP had no effect on conserving nitrogen during sludge composting; the total nitrogen loss was reduced from 29.3 to 18.2% when sawdust was mixed with RPP in a ratio of 1:1. Therefore, mixing RPP and sawdust in the dry weight ratio of 1:1 (sawdust: RPP) can be potentially used for reducing composting cost and improving the sewage sludge composting by reducing the amount of sawdust mixed and mitigating GHG and NH3 emissions.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51508167, 41805123), the Key Scientific Research Project of Universities in Henan Province (Grant Nos. 16A560022, 17B610006), and the PhD research startup foundation of Henan Normal University (Grant Nos. 5101219170108, 5101219170113).

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Correspondence to Yunbei Li or Jishao Jiang.

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Responsible Editor: Philippe Garrigues

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Li, Y., Song, J., Liu, T. et al. Influence of reusable polypropylene packing on ammonia and greenhouse gas emissions during sewage sludge composting—a lab-scale investigation. Environ Sci Pollut Res 28, 40653–40664 (2021). https://doi.org/10.1007/s11356-020-10469-w

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  • DOI: https://doi.org/10.1007/s11356-020-10469-w

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