| 郑孟杰,靳红梅,张松贺,李继洲.猪粪沼渣水热炭中重金属浸出特征研究[J].农业环境科学学报,2018,37(1):157-164. |
| 猪粪沼渣水热炭中重金属浸出特征研究 |
| The leaching characteristics of heavy metals from hydrochars of digested swine manure |
| 投稿时间：2017-06-19 |
| DOI：10.11654/jaes.2017-0868 |
| 中文关键词: 水热炭 猪粪沼渣 重金属 浸出特征 |
| 英文关键词: hydrochar digested swine manure heavy metal leaching characteristics |
| 基金项目:国家自然科学基金项目（21577052）；国家重点研发计划课题（2016YFD0501401）；江苏省农业科技自主创新资金项目（CX （16）1003-1） |
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| 中文摘要: |
| 水热炭化（HTC）是处理沼渣等高含水率废弃物的有效途径，为明确猪粪沼渣（M-R）经HTC后其中重金属的浸出特征，以190℃和250℃制备的猪粪沼渣水热炭（M-190、M-250）为研究对象，探讨其中Zn、Cu、As、Pb和Cd的总量及其在不同pH条件下的浸出特征。结果表明：M-190、M-250与M-R相比，Zn分别增加4.12%、18.99%，Cu分别增加7.00%、14.00%，As分别增加26.57%、289.70%，但Pb和Cd的总量经HTC后有所降低。猪粪沼渣水热炭中溶解态重金属含量显著（P<0.001）低于M-R，且M-250显著（P<0.001）低于M-190，其中M-250中溶解态Zn、Cu、Pb和Cd的含量较M-190降低了50.99%、95.50%、66.47%、100.00%。pH值为2时，水热炭中重金属浸出量最大，但随着pH的增加浸出量急剧下降，当pH在4~10范围内时，各重金属浸出量维持在相近水平。研究表明，HTC对M-R中的Zn、Cu和As有浓缩作用，适当提高HTC温度可降低猪粪沼渣水热炭中溶解态重金属含量。此研究不仅有利于猪粪沼渣水热炭的安全性评价，而且HTC技术为粪污的无害化处理提供有效途径。 |
| 英文摘要: |
| Hydrothermal carbonization(HTC) is an effective way to treat high water content waste, such as digested animal manure. In order to clarify the leaching characteristics of heavy metals in hydrochars derived from digestates, research was conducted on digested swine manure(M-R) that was hydrothermally carbonized at 190℃ and 250℃, and the corresponding hydrochars(M-190 and M-250, respectively) were used to study the total contents of Zn, Cu, As, Pb, and Cd and their leaching characteristics from the hydrochars under different pH conditions. Compared with M-R, the total contents of Zn, Cu, and As in M-190 were higher by 4.12%, 7.00%, and 26.57%, respectively, whereas those in M-250 were higher by 18.99%, 14.00%, and 289.70%. On the contrary, the total amount of Pb and Cd decreased after HTC. The contents of dissolved heavy metals in M-190 and M-250 were significantly(P<0.001) lower than those in M-R. Meanwhile, the contents of dissolved heavy metals in M-250 were remarkably(P<0.001) lower than those in M-190. The contents of dissolved Zn, Cu, Pb, and Cd in M-250 were lower by 50.99%, 95.50%, 66.47%, and 100.00%, respectively, compared to those in M-190. The leaching contents of heavy metals in the hydrochars reached their maximum at pH 2. After that, their leaching contents decreased sharply with an increase of pH. The leaching contents were similar as the pH ranged from 4 to 10. The results showed that HTC had an enrichment effect on Zn, Cu, and As in M-190 and M-250, and appropriately raising the HTC temperature reduced the contents of dissolved heavy metals in the hydrochars. This study is not only beneficial to the safety assessment of hydrochars of digested swine manure, but HTC is an effective way to treat digested swine manure harmlessly. |
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