Transformation and Mobility of Cu, Zn, and Cr in Sewage Sludge during Anaerobic Digestion with Pre- or Interstage Hydrothermal Treatment,Environmental Science & Technology

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Transformation and Mobility of Cu, Zn, and Cr in Sewage Sludge during Anaerobic Digestion with Pre- or Interstage Hydrothermal Treatment
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-01-18 , DOI: 10.1021/acs.est.0c05164
Qian Wang ₁ , Chiqian Zhang ₂ , Haesung Jung ₁ , Pan Liu ₁ , Dhara Patel ₁ , Spyros G. Pavlostathis ₂ , Yuanzhi Tang _{1,

2}

Affiliation

Anaerobic digestion (AD) combined with hydrothermal treatment (HT) is an attractive technology for sewage sludge treatment and resource recovery. The fate and distribution of heavy metals in the sludge during combined HT/AD significantly affect the sludge final disposal/utilization options, yet such information is still lacking. This study systematically characterizes the transformation of important heavy metals Cu, Zn, and Cr in sewage sludge during AD with pre- or interstage HT (i.e., HT-AD or AD-HT-AD, respectively). Complementary sequential chemical extraction and X-ray absorption spectroscopy were used to characterize the speciation and mobility of metals. For the HT-AD system, both Cu and Zn predominantly occur as sulfides in HT hydrochars. Subsequent AD favors the formation of Cu₂S and partial transformation of nano-ZnS to adsorbed and organo-complexed Zn species. HT favors the formation of Cr-bearing silicates in hydrochars, whereas Fe(III)-Cr(III)-hydroxide and Cr(III)-humic complex are the predominant Cr species in AD solids. Similar reaction pathways occur in the AD-HT-AD system with some minor differences in metal species and contents, as the first-stage AD changed the sludge matrix. These findings have important implications for understanding the fate and mobility of heavy metals in sludge-derived hydrochars and AD solids.

中文翻译：

预处理或级间水热处理厌氧消化过程中污泥中铜，锌和铬的转化和迁移率

厌氧消化（AD）结合水热处理（HT）是一种有吸引力的技术，用于污水污泥处理和资源回收。HT / AD混合过程中污泥中重金属的命运和分布显着影响了污泥的最终处置/利用选择，但仍缺乏此类信息。这项研究系统地表征了AD之前或阶段间HT（即分别为HT-AD或AD-HT-AD）在污水污泥中重要重金属Cu，Zn和Cr的转化。互补的顺序化学萃取和X射线吸收光谱用于表征金属的形态和迁移率。对于HT-AD系统，Cu和Zn都主要在HT烃中以硫化物形式存在。随后的AD有利于Cu ₂的形成S和纳米ZnS的部分转化为吸附的和有机络合的Zn物质。HT有助于在炭中形成含Cr的硅酸盐，而Fe（III）-Cr（III）-氢氧化物和Cr（III）-腐殖土是AD固体中主要的Cr物种。AD-HT-AD系统中发生类似的反应路径，但金属的种类和含量略有不同，因为第一阶段的AD改变了污泥基质。这些发现对于理解污泥来源的碳氢化合物和AD固体中重金属的命运和流动性具有重要意义。

更新日期：2021-02-02

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