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Comparison of biodiesel yield of three processes using sewage sludge as feedstock and byproduct characteristics by in situ transesterification

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Abstract

Recent studies have considered utilizing sewage sludge as feedstock for biodiesel production because of its abundance and high lipid content. In this study, we first compared the biodiesel yields of traditional transesterification, in situ transesterification, and two-step esterification–transesterification under similar conditions. The in situ process generated the highest yield of biodiesel (16.6%) with acceptable purity (94.3%) as verified by GC–MS. The most abundant species in the three methods were methyl hexadecanoate (C16:0), methyl palmitoleate (C16:1), methyl stearate (C18:0), methyl oleate (C18:1), and methyl myristate (C14:0). The byproducts from in situ transesterification included intermediate fluid, residue, and washing water. Given their recyclability, these byproducts showed negligible environmental impact. Methanol, one of the response reagents, can be recovered from the intermediate fluid. More than 80% phosphor was transferred to the intermediate fluid, whereas more than 88% nitrogen remained in the residue of sewage sludge.

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Acknowledgements

Funding was provided by National Natural Science Foundation of China (Grant no.: 51308538) and Natural Science Foundation of Beijing Municipality (Grant no.: 8172029).

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Authors and Affiliations

  1. School of Environment and Natural Resources, Renmin University of China, Beijing, 100872, China

    Fenfen Zhu, Yi Dong & Guohua Liu

  2. Beijing Drainage Group, Huaifang Water Reclamation Plant, Beijing, 100076, China

    Xuemin Wu

  3. Development and Reform Commission of Bomi County in Linzhi Area, Nyingchi, 860300, China

    Juanjuan Qi

  4. Research Center, Beijing Drainage Group, Beijing, 100124, China

    Jiawei Wang

Authors
  1. Fenfen Zhu
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  2. Yi Dong
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  3. Xuemin Wu
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  4. Juanjuan Qi
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  5. Jiawei Wang
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  6. Guohua Liu
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Correspondence to Fenfen Zhu.

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Zhu, F., Dong, Y., Wu, X. et al. Comparison of biodiesel yield of three processes using sewage sludge as feedstock and byproduct characteristics by in situ transesterification. J Mater Cycles Waste Manag 21, 406–414 (2019). https://doi.org/10.1007/s10163-018-0803-9

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  • DOI: https://doi.org/10.1007/s10163-018-0803-9

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