Feasibility of sewage sludge derived hydrochars for agricultural application: Nutrients (N, P, K) and potentially toxic elements (Zn, Cu, Pb, Ni, Cd)

Fei，Ying heng1,2,3; Zhao，Dan3,4; Liu，Ye2; Zhang，Weihua2; Tang，Yuan yuan5; Huang，Xuexia1; Wu，Qihang1,6; Wang，Yue xing7; Xiao，Tangfu1; Liu，Chengshuai8

2019-12-01

10.1016/j.chemosphere.2019.124841

CHEMOSPHERE   影响因子和分区

0045-6535

1879-1298

Hydrochars derived from municipal sewage sludge was analyzed for its feasibility for value-added recycling. Results of carbon content and elemental composition suggested that the hydrochars might not be comparable with pyrochars regarding to the carbon sequestration, long-term stability and fuel quality. Application as soil amendment would be a better approach for hydrochar utilization. To examine the potential benefits and risks of that, the total and available content of nutrients (i.e. N, P, and K) were measured, and the potentially toxic elements (PTEs, i.e. Zn, Cu, Pb, Ni and Cd) were analyzed for the total content, speciation, and leaching potential. Compared with pyrochars derived from the same feedstock, hydrochars had lower pH and higher cation exchange capacity. The available content of N (1.58–6.87 g/kg), P (0.270–0.901 g/kg), and K (0–0.873 g/kg) in the chars was less than the feedstock sludge (3.33 g/kg N, 3.02 g/kg P, 2.07 g/kg K), but still far higher than that of the agricultural soil (i.e. 0.014–0.488 g/kg N, 0.02 g/kg P, <0.1–0.272 g/kg). Remarkably, hydrochars showed better nutritional balance than pyrochars for its higher available K content. Risk of potentially toxic elements contamination by the sludge was efficiently reduced in either hydrochars or pyrochars, except the high leaching potential of Zn in pyrochars. Overall, in addition to the advantages of the hydrothermal carbonization process as energy saving and value-added liquid by-products, the hydrochars derived from sludge, with sufficient and balanced nutrients and limited PTEs pollution risk, can be a feasible and value-added material as soil amendment.

Agricultural applications Hydrochar Nutrients Potentially toxic elements Sludge

SCI ; EI

英语

其他

Project of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology[2018K12]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000491634500131

PERGAMON-ELSEVIER SCIENCE LTD

20193807447895

Agriculture ; Carbon ; Carbonization ; Energy conservation ; Feedstocks ; Forestry ; Leaching ; Nutrients ; Risk assessment ; Sewage sludge

Sewage Treatment:452.2 ; Soils and Soil Mechanics:483.1 ; Energy Conservation:525.2 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Agricultural Equipment and Methods; Vegetation and Pest Control:821 ; Accidents and Accident Prevention:914.1

ENVIRONMENT/ECOLOGY

2-s2.0-85072173988

Scopus

1.School of Environmental Science and EngineeringGuangzhou University,Guangzhou,510006,China
2.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologySchool of Environmental Science and EngineeringSun Yat-Sen University,Guangzhou,510275,China
3.Guangzhou Institute of Advanced TechnologyChinese Academy of Sciences,Guangzhou,511458,China
4.Shenzhen Institutes of Advanced Technology,Shenzhen,518055,China
5.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control and Remediation TechnologySchool of Environmental Science and EngineeringSouthern University of Science and Technology,Shenzhen,518055,China
6.Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationInstitute of Environmental Research at Greater BayGuangzhou University,Guangzhou,510006,China
7.Laboratory of Municipal Wastewater Treatment and Reutilization Engineering,Shenzhen,518056,China
8.State Key Laboratory of Environmental GeochemistryInstitute of GeochemistryChinese Academy of Sciences,Guiyang,550081,China

Fei，Ying heng,Zhao，Dan,Liu，Ye,et al. Feasibility of sewage sludge derived hydrochars for agricultural application: Nutrients (N, P, K) and potentially toxic elements (Zn, Cu, Pb, Ni, Cd)[J]. CHEMOSPHERE,2019,236.

Fei，Ying heng.,Zhao，Dan.,Liu，Ye.,Zhang，Weihua.,Tang，Yuan yuan.,...&Liu，Chengshuai.(2019).Feasibility of sewage sludge derived hydrochars for agricultural application: Nutrients (N, P, K) and potentially toxic elements (Zn, Cu, Pb, Ni, Cd).CHEMOSPHERE,236.

Fei，Ying heng,et al."Feasibility of sewage sludge derived hydrochars for agricultural application: Nutrients (N, P, K) and potentially toxic elements (Zn, Cu, Pb, Ni, Cd)".CHEMOSPHERE 236(2019).