Stabilization of heavy metals in sewage sludge by co-hydrothermal carbonization with biomass bottom ash

Wen, Haifeng1; Zhao, Min1; Gao, Jingjing1; Zhang, He1; Lu, Junyang2

2024-05-01

10.1007/s10163-024-01912-y

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT   影响因子和分区

1438-4957

1611-8227

Heavy metal pollution is a significant obstacle to the resourceful application of sewage sludge. The existing research on co-hydrothermal carbonization of sewage sludge and biomass bottom ash is limited. This study examines the use of biomass bottom ash as a modifier at different weight percentages (0, 25, 50, and 75%) to stabilize heavy metals during co-hydrothermal carbonization. The characteristics of heavy metals, including total content, speciation, ecological risk assessment, and leaching content, were thoroughly investigated to ensure the safe use of hydrochars. The results indicate that heavy metals mostly remained in the solid phase, particularly Cr, Ni, Cu, Zn, and Cd. In addition, heavy metals exhibited more stability, and their chemical speciation changed from directly available to potentially active and inactive states in hydrochars. Furthermore, the pH and specific surface area of hydrochars increased slightly. Characterization results and FTIR spectra demonstrated that the aromatization degree of hydrochars significantly increased with the decrease in N/C and H/C ratio. Risk assessment showed that the danger of hydrochars reduced significantly compared to raw sludge. The findings present an innovative method for the collaborative treatment of sewage sludge and biomass bottom ash to prevent heavy metal pollution.

Sewage sludge Biomass bottom ash Co-hydrothermal carbonization Heavy metals Ecological risk

SCI ; EI

英语

其他

National Natural Science Foundation of China[42207310] ; National Natural Science Foundation of China["21327309D","20079"] ; S and T Program of Hebei[22010502900]

Environmental Sciences & Ecology

Environmental Sciences

WOS:001186152700003

SPRINGER

Web of Science

1.Univ Shanghai Sci & Technol, Sch Environm & Architecture, 516 Jungong Rd, Shanghai 200093, Peoples R China
2.Southern Univ Sci & Technol, Coll Environm Sci & Engn, 1088 Xueyuan Ave, Shenzhen 518055, Peoples R China

Wen, Haifeng,Zhao, Min,Gao, Jingjing,et al. Stabilization of heavy metals in sewage sludge by co-hydrothermal carbonization with biomass bottom ash[J]. JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT,2024,26(3).

Wen, Haifeng,Zhao, Min,Gao, Jingjing,Zhang, He,&Lu, Junyang.(2024).Stabilization of heavy metals in sewage sludge by co-hydrothermal carbonization with biomass bottom ash.JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT,26(3).

Wen, Haifeng,et al."Stabilization of heavy metals in sewage sludge by co-hydrothermal carbonization with biomass bottom ash".JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 26.3(2024).