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Journal of Material Cycles and Waste Management

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22.09.2020 | ORIGINAL ARTICLE

Self-recycling of sewage sludge as a coagulant and mechanism in sewage sludge dewatering

verfasst von: Jiahuan Wu, Tao Lu, Guang Yang, Wei Meng, Haoran Yuan, Yong Chen

Erschienen in: Journal of Material Cycles and Waste Management | Ausgabe 6/2020

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Abstract

The properties of sewage sludge-derived biochar (BC) pyrolyzed at 300–900 °C were characterized, and which exhibited the basic properties of coagulant. When 1 g BC500 was added to 100 mL waste-activated sludge (WAS), the maximum mean settlement rate reached 8.20 mL min⁻¹ within 10 min, and the volume of the settlement with settling time decreased to 13 mL. The capillary suction time of BC500 (12 s) was superior to those of municipal solid waste incineration (MSWI) fly ash (13.40 s), coal fly ash (14.20 s), and activated carbon (12.20 s). In addition, added BC may reduce the moisture content of sludge cake, especially for BC500. It can be that soluble cations and organic functional groups neutralize the negative charge of WAS which is helpful to shorten settling time. Meanwhile, the pore structure is beneficial for reducing moisture content of sludge cake. As results shown, BC was feasible to improve sewage sludge dewatering used as a coagulant.

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Titel: Self-recycling of sewage sludge as a coagulant and mechanism in sewage sludge dewatering
verfasst von: Jiahuan Wu
Tao Lu
Guang Yang
Wei Meng
Haoran Yuan
Yong Chen
Publikationsdatum: 22.09.2020
Verlag: Springer Japan
Erschienen in: Journal of Material Cycles and Waste Management / Ausgabe 6/2020
Print ISSN: 1438-4957
Elektronische ISSN: 1611-8227
DOI: https://doi.org/10.1007/s10163-020-01083-6

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