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Immobilization of metal(loid)s in hydrochars produced from digested swine and dairy manures

文献类型： 外文期刊

作者： Jin, Hongmei 1 ; Yan, Demin 3 ; Zhu, Ning 1 ; Zhang, Songhe 4 ; Zheng, Mengjie 4 ;

作者机构： 1.Jiangsu Acad Agr Sci, Circular Agr Res Ctr, Nanjing 210014, Jiangsu, Peoples R China

2.Minist Agr, East China Sci Observing & Expt Stn Dev & Utiliza, Nanjing 210014, Jiangsu, Peoples R China

3.Nanjing Forest Police Coll, Nanjing 210023, Jiangsu, Peoples R China

4.Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China

关键词： Digested swine and dairy manures; Hydrochar; Metal(loid)s; Immobilization; Speciation; Environmental risk assessment

期刊名称：WASTE MANAGEMENT （ 影响因子：7.145； 五年影响因子：7.907 ）

ISSN： 0956-053X

年卷期： 2019 年 88 卷

页码：

收录情况： SCI

摘要： Anaerobic digestion technology is widely used for treatment of swine and dairy manures in livestock farms, but the digested swine and dairy manures (SD-S, SD-D) must be properly disposed. In this study, hydrothermal carbonization (HTC) was used to deal with SD-S and SD-D. The resulting hydrochars (HC-S and HC-D) were investigated for the migration, speciation and potential environmental risk of metal(loid) s therein. The results showed that about 20%-50% of metal(loid)s in SD-S and 11%-36% in SD-D lost through the dissolution of the metal(loid)s in solution during HTC process. The remaining metal(loid)s were more concentrated in HC-D compared to HC-S. The concentrations of water-extractable metal (loid)s showed clear decrease trend in HC-S and HC-D. The bioavailable metal(loid) fraction (acid soluble/exchangeable fraction and reducible fraction) were transformed into the stable fraction (residual fraction) during HTC process. The results indicated that HTC process could immobilize most metal (loid)s leaching from HC-S and HC-D, except for Zn and Cd in HC-S. The maximum leaching concentrations of all metal(loid)s happened at pH of 2; meanwhile less fraction of metal(loid)s can be leached out from HC-D into water. The environmental risk assessment values suggested that HC-D was more environment-friendly than HC-S. This study provides a useful support for reuse of HC-S and HC-D as pollution remediation and soil amendment with very low leaching toxicity and potential ecological risk of metal(loid)s. (C) 2019 Elsevier Ltd. All rights reserved.

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