受污染水稻秸秆热解产物中镉含量及溶出性研究
PDF下载 (299)王岳锋,董志颖,陈再明,石志华.受污染水稻秸秆热解产物中镉含量及溶出性研究[J].宁波大学学报(理工版),2021,34(3):54-59.DOI:
WANG Yuefeng,DONG Zhiying,CHEN Zaiming,SHI Zhihua.Content and leaching property of cadmium on products derived from pyrolysis of polluted rice straw[J].Journal of Ningbo University(Natural Science & Engineering Edition),2021,34(3):54-59.DOI:
| Title: | Content and leaching property of cadmium on products derived from pyrolysis of polluted rice straw |
| 作者: | 王岳锋, 董志颖, 陈再明, 石志华 |
| Author(s): | WANG Yuefeng, DONG Zhiying, CHEN Zaiming, SHI Zhihua |
| 关键词: | 水稻秸秆; 生物炭; 秸秆灰; 镉溶出; 热解 |
| Keywords: | rice straw; biochar; straw ash; cadmium dissolution; pyrolysis |
| 分类号: | X53 |
| 文献标识码: | A |
| 摘要: | 以镉污染土种植水稻秸秆为原料, 通过500℃不同时间(10~720min)处理制备秸秆热解产物(生物炭和秸秆灰), 测定产物中镉的含量及其溶出性. 结果表明, 水稻秸秆经热解处理后挥发镉总量的29.6%~48.4%; 样品产率随热解时间的增加而下降; 单位质量生物炭和秸秆灰中镉含量为2.35~7.05mg·kg-1和15.0~16.4mg·kg-1, 分别是水稻秸秆中镉含量(0.948mg·kg-1)的2.5~7.4倍和15.8~17.3倍; 通过不同提取剂得到镉溶出率由低到高依次为0%~43.2%(采用0.01mol·L-1 CaCl2提取)、0%~44.3%(采用Toxicity Characteristic Leaching Procedure提取)、28.8%~58.8%(采用1mol·L-1 pH5.0乙酸-乙酸钠单次提取)、35.1%~98.4%(采用1mol·L-1 pH5.0乙酸-乙酸钠连续4次提取); 随着热处理时间的延长, 样品中镉溶出率逐渐降低; 由于热解过程中镉的挥发和形态转变, 水稻秸秆转变为生物炭和秸秆灰后镉的可溶出总量(采用1mol·L-1 pH5.0乙酸-乙酸钠连续4次提取)由0.933mg·kg-1降至0.223~0.384mg·kg-1, 表明受镉污染的水稻秸秆热解转化为生物炭和秸秆灰可以有效缓解镉潜在的溶出风险. |
| Abstract: | In this study, biochar and straw ash was made by 500℃ heating treatment of rice straw from cadmium contaminated soil with different time (10-720min). The content and leaching property of cadmium (Cd) in the samples were determined. The results show that 29.6%-48.4% of Cd was lost after 500℃ heating treatment of rice straw. The yield of samples decreased with the increase of pyrolysis time, the contents of Cd left in biochar and straw ash were 2.35-7.05mg·kg-1 and 15.0-16.4mg·kg-1, respectively. They were 2.5-7.4 times and 15.8-17.3 times of the Cd content in rice straw (0.948mg·kg-1), respectively. Cadmium in the sample was extracted by different extracting solutions, where percentages of leachable Cd in different extracting solutions were 0%-43.2% (0.01mol·L-1 CaCl2 extraction), 0%-44.3% (TCLP extraction), 28.7%-58.8% (one time extraction with 1mol·L-1 pH 5.0 acetic acid/sodium acetate) and 35.1%-98.4% (four-times successive extraction with 1mol·L-1 pH 5.0 acetic acid/sodium acetate). The percentage of leachable Cd decreased progressively with the prolonging of heating time. The total amount of Cd leached in acetic acid-sodium acetate solution (four-times successive extraction) decreased from 0.933mg·kg-1 rice straw (normalized to raw biomass) to 0.223-0.384mg·kg-1 rice straw. It was suggested that the decrease of leachable Cd was caused by the volatilizing loss of Cd in the 500℃ heating process and the strong retention ability of Cd in biochar or straw ash. These results illustrated that heating induced conversion of contaminated rice straw to biochar and straw ash could effectively alleviate the potential risk from Cd leaching. |
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| 备注/Memo: | 收稿日期:2020-09-08.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:国家自然科学基金（21976097）,浙江省自然科学基金（LGF19E080006）. 第一作者:王岳锋（1994－）,男,浙江台州人,在读硕士研究生,主要研究方向:重金属污染治理.E-mail:459487407@qq.com *通信作者:董志颖（1977－）,女,吉林长春人,讲师,主要研究方向:生态环境保护.E-mail:dongzhiying@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
