The conversion and migration behavior of phosphorus speciation during pyrolysis of different sludges

Qianlan Li; Qingdan Wu; Xiaochen Zheng; Pengfei Wang; Dongsheng Zou; Fen Liu; Zhihua Xiao; Qianlan Li; Qingdan Wu; Xiaochen Zheng; Pengfei Wang; Dongsheng Zou; Fen Liu; Zhihua Xiao

doi:10.3934/environsci.2024001

AIMS Environmental Science

2024, Volume 11, Issue 1: 1-20. doi: 10.3934/environsci.2024001

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Research article

The conversion and migration behavior of phosphorus speciation during pyrolysis of different sludges

1.
College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan, 410128, China
2.
Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, China

Received: 21 November 2023 Revised: 01 January 2024 Accepted: 09 January 2024 Published: 18 January 2024

The study was enforced to probe the conversion and migration behavior of phosphorus speciation in sludge and the biochar received from pyrolysis of municipal sludge (MS), town sludge (TS), and slaughterhouse sludge (SS). This study creatively used fractionation of soil phosphorus to further differentiate speciation of phosphorus in three sludges (MS, TS, and SS). According to the x-ray diffraction (XRD) analysis and sequential extraction, the study proved the dependence of P speciation conversion on pyrolysis temperature and different types of raw sludge. The results of P-fractionation indicated that Ca-bound IP (Ca-IP) content in all biochars significantly increased at pyrolysis temperature of 350–800 ℃, and the proportion of soluble and loosely bound IP (SL-IP), aluminum-bound IP (Al-IP), and Fe-bound IP (Fe-IP) of MS and SS decreased. The difference is that the Al-IP in the TS increased slightly as the pyrolysis temperature increased. Among the three kinds of sludge, the Olsen-P of TS is the lowest because the content of Olsen-P in sludge will decrease with the decrease of pH in the process of sewage treatment after acidification. In addition, XRD patterns of three sludges and biochar further confirmed the low crystallinity of AlPO₄ minerals. Through in-depth research on the environmental behavior of phosphorus, this study might additionally provide essential knowledge for the recovery and utilization of phosphorus in sludge.
- sludges,
- pyrolysis,
- phosphorus,
- speciation,
- biochars,
- minerals
Citation: Qianlan Li, Qingdan Wu, Xiaochen Zheng, Pengfei Wang, Dongsheng Zou, Fen Liu, Zhihua Xiao. The conversion and migration behavior of phosphorus speciation during pyrolysis of different sludges[J]. AIMS Environmental Science, 2024, 11(1): 1-20. doi: 10.3934/environsci.2024001

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Abstract

The study was enforced to probe the conversion and migration behavior of phosphorus speciation in sludge and the biochar received from pyrolysis of municipal sludge (MS), town sludge (TS), and slaughterhouse sludge (SS). This study creatively used fractionation of soil phosphorus to further differentiate speciation of phosphorus in three sludges (MS, TS, and SS). According to the x-ray diffraction (XRD) analysis and sequential extraction, the study proved the dependence of P speciation conversion on pyrolysis temperature and different types of raw sludge. The results of P-fractionation indicated that Ca-bound IP (Ca-IP) content in all biochars significantly increased at pyrolysis temperature of 350–800 ℃, and the proportion of soluble and loosely bound IP (SL-IP), aluminum-bound IP (Al-IP), and Fe-bound IP (Fe-IP) of MS and SS decreased. The difference is that the Al-IP in the TS increased slightly as the pyrolysis temperature increased. Among the three kinds of sludge, the Olsen-P of TS is the lowest because the content of Olsen-P in sludge will decrease with the decrease of pH in the process of sewage treatment after acidification. In addition, XRD patterns of three sludges and biochar further confirmed the low crystallinity of AlPO₄ minerals. Through in-depth research on the environmental behavior of phosphorus, this study might additionally provide essential knowledge for the recovery and utilization of phosphorus in sludge.

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