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硝酸辅助超声作用强化污泥中Cd和As的沥出

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钟振宇, 王祥, 陈灿, 李小明. 硝酸辅助超声作用强化污泥中Cd和As的沥出[J]. 环境化学, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
引用本文: 钟振宇, 王祥, 陈灿, 李小明. 硝酸辅助超声作用强化污泥中Cd和As的沥出[J]. 环境化学, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
shu
ZHONG Zhenyu, WANG Xiang, CHEN Can, LI Xiaoming. Enhanced cadmium and arsenic leaching from sludge by ultrasound assisted by nitric acid[J]. Environmental Chemistry, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
Citation: ZHONG Zhenyu, WANG Xiang, CHEN Can, LI Xiaoming. Enhanced cadmium and arsenic leaching from sludge by ultrasound assisted by nitric acid[J]. Environmental Chemistry, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
shu

硝酸辅助超声作用强化污泥中Cd和As的沥出

  • 1.

    湖南省环境保护科学研究院, 长沙, 410042;

  • 2.

    湖南大学环境科学与工程学院, 长沙, 410082

  • 基金项目:

    湖南省科技厅重点项目（2015CK3007）资助.

Enhanced cadmium and arsenic leaching from sludge by ultrasound assisted by nitric acid

  • 1.

    Huan Research Academy of Environment Science, Changsha, 410042, China;

  • 2.

    College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China

  • Fund Project: Supported by the Key Project of Hunan Provincial Science and Technology Department(2015CK3007).

  • 摘要: 利用硝酸辅助超声强化污泥中Cd、As沥出实现污泥的农用.研究结果表明，在1.6 W·mL-1超声30 min条件下，污泥中Cd的溶出率高达53.72%；在1.2 W·mL-1超声30 min条件下，污泥中As的溶出率高达58.63%，污泥中镉和砷的含量由6.80 mg·kg-1、91.13 mg·kg-1分别降低至4.61 mg·kg-1和54.66 mg·kg-1.在0.04 mol·L-1硝酸辅助下，污泥中Cd和As的含量进一步降至4.25 mg·kg-1和48.16 mg·kg-1，完全满足我国农用污泥中污染物控制标准要求（Cd≤5 mg·kg-1，As≤75 mg·kg-1）.硝酸辅助低频超声处理后，污泥中交换态、碳酸盐结合态、铁锰氧化物结合态镉和砷含量明显下降，有机物结合态和残渣态镉和砷含量显著升高.结果表明，硝酸辅助低频超声可以使污泥中镉和砷高效沥出，实现污泥安全农用.
    Abstract: Ultrasound assisted by nitric acid was applied to enhance the leaching of Cd and As from sludge to realize the agricultural use of sludge. Results demonstrated that the highest dissolution rates of Cd and As from sludge reached 53.72% and 58.63% respectively under the conditions of 1.6 W·mL-1/30 min and 1.2 W·mL-1/30min. Meanwhile, the contents of Cd and As in dry sludge were reduced from 6.80 mg·kg-1 and 91.13 mg·kg-1 to 4.61 mg·kg-1 and 54.66 mg·kg-1. With the assistance of nitric acid (0.04 mol·L-1), the contents of Cd and As in dry sludge were further reduced to 4.25 mg·kg-1 and 48.16 mg·kg-1 respectively, which fully met the control standards for pollutants in agricultural sludge in China (Cd ≤ 5mg/kg, As ≤ 75mg/kg). Meanwhile, the contents of exchangeable, bound to carbonates and bound to Fe/Mn oxides for Cd and As declined significantly, while the organic bound and residue bound were increased. The above results show that the ultrasound assisted by nitric acid can efficiently leach Cd and As from sludge and realize a safe use of sludge in agriculture.
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  • 收稿日期:  2017-09-14
  • 刊出日期:  2018-06-15
钟振宇, 王祥, 陈灿, 李小明. 硝酸辅助超声作用强化污泥中Cd和As的沥出[J]. 环境化学, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
引用本文: 钟振宇, 王祥, 陈灿, 李小明. 硝酸辅助超声作用强化污泥中Cd和As的沥出[J]. 环境化学, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
shu
ZHONG Zhenyu, WANG Xiang, CHEN Can, LI Xiaoming. Enhanced cadmium and arsenic leaching from sludge by ultrasound assisted by nitric acid[J]. Environmental Chemistry, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
Citation: ZHONG Zhenyu, WANG Xiang, CHEN Can, LI Xiaoming. Enhanced cadmium and arsenic leaching from sludge by ultrasound assisted by nitric acid[J]. Environmental Chemistry, 2018, 37(6): 1351-1361. doi: 10.7524/j.issn.0254-6108.2017091404
shu

硝酸辅助超声作用强化污泥中Cd和As的沥出

  • 1.  湖南省环境保护科学研究院, 长沙, 410042;
  • 2.  湖南大学环境科学与工程学院, 长沙, 410082
  • 收稿日期:  2017-09-14
基金项目:

湖南省科技厅重点项目（2015CK3007）资助.

摘要: 利用硝酸辅助超声强化污泥中Cd、As沥出实现污泥的农用.研究结果表明，在1.6 W·mL-1超声30 min条件下，污泥中Cd的溶出率高达53.72%；在1.2 W·mL-1超声30 min条件下，污泥中As的溶出率高达58.63%，污泥中镉和砷的含量由6.80 mg·kg-1、91.13 mg·kg-1分别降低至4.61 mg·kg-1和54.66 mg·kg-1.在0.04 mol·L-1硝酸辅助下，污泥中Cd和As的含量进一步降至4.25 mg·kg-1和48.16 mg·kg-1，完全满足我国农用污泥中污染物控制标准要求（Cd≤5 mg·kg-1，As≤75 mg·kg-1）.硝酸辅助低频超声处理后，污泥中交换态、碳酸盐结合态、铁锰氧化物结合态镉和砷含量明显下降，有机物结合态和残渣态镉和砷含量显著升高.结果表明，硝酸辅助低频超声可以使污泥中镉和砷高效沥出，实现污泥安全农用.

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