Effect of hydrothermal carbonization on heavy metals in swine manure: Speciation, bioavailability and environmental risk

Qianqian Lang; Mengjun Chen; Yanchuan Guo; Zhengang Liu; Chao Gai

doi:10.1016/j.jenvman.2018.12.073

Effect of hydrothermal carbonization on heavy metals in swine manure: Speciation, bioavailability and environmental risk

J Environ Manage. 2019 Mar 15:234:97-103. doi: 10.1016/j.jenvman.2018.12.073. Epub 2019 Jan 4.

Authors

Qianqian Lang¹, Mengjun Chen², Yanchuan Guo³, Zhengang Liu⁴, Chao Gai¹

Affiliations

¹ Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
³ University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Photochemical Conversion and Optoelectronic Material, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
⁴ Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: zgliu@rcees.ac.cn.

PMID: 30616193
DOI: 10.1016/j.jenvman.2018.12.073

Abstract

The speciation, bioavailability and environmental risk of heavy metals (HMs) in the hydrochar derived from hydrothermal carbonization (HTC) of swine manure were investigated in this study. The results indicated that the majority of HMs originally in swine manure were retained in the hydrochar by HTC, and CaO addition substantially reduced the HMs concentration in the hydrochar. HTC especially CaO assisted HTC significantly promoted the HMs transformation from the bioavailable fraction to the relatively stable fraction, and thus decreased their environmental risk in the hydrochar. Moreover, the Toxicity Characteristic Leaching Procedure and diethylenetriamine pentaacetic acid test revealed that the leachability and plant-bioavailability of HMs in swine manure were greatly declined by HTC especially for HTC with 15% CaO addition. The present study suggested that HTC was an effective disposal approach for swine manure from the perspective of HMs immobilization, especially for CaO assisted HTC.

Keywords: Bioavailability; CaO addition; Heavy metals; Hydrothermal carbonization; Risk assessment; Swine manure.

MeSH terms

Animals
Biological Availability
Manure*
Metals, Heavy*
Swine

Substances

Manure
Metals, Heavy