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血粉对废水中镉离子的高效去除效应

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李思彤, 舒芳芳, 王楠, 陈红兵, 李亚东, 李顺意. 血粉对废水中镉离子的高效去除效应[J]. 环境工程学报, 2017, 11(9): 5001-5006. doi: 10.12030/j.cjee.201609045
引用本文: 李思彤, 舒芳芳, 王楠, 陈红兵, 李亚东, 李顺意. 血粉对废水中镉离子的高效去除效应[J]. 环境工程学报, 2017, 11(9): 5001-5006. doi: 10.12030/j.cjee.201609045
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LI Sitong, SHU Fangfang, WANG Nan, CHEN Hongbing, LI Yadong, LI Shunyi. High efficient removal effect of Cd2+ from wastewater by adsorption onto blood powder[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5001-5006. doi: 10.12030/j.cjee.201609045
Citation: LI Sitong, SHU Fangfang, WANG Nan, CHEN Hongbing, LI Yadong, LI Shunyi. High efficient removal effect of Cd2+ from wastewater by adsorption onto blood powder[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5001-5006. doi: 10.12030/j.cjee.201609045
shu

血粉对废水中镉离子的高效去除效应

  • 1.

    湖北大学生命科学学院, 武汉 430062

  • 2.

    湖北大学资源环境学院, 武汉 430062

  • 基金项目:

    国家重点研发计划（2016YFD0200900）

  • 中图分类号: X703

High efficient removal effect of Cd2+ from wastewater by adsorption onto blood powder

  • 1.

    College of Life Sciences, Hubei University, Wuhan 430062, China

  • 2.

    College of Resources and Environmental Sciences, Hubei University, Wuhan 430062, China

  • Fund Project:

  • 摘要: 以屠宰场废弃动物血液为原料，经高温干燥、粉碎为血粉，以此血粉为吸附剂，研究血粉添加量、溶液初始浓度、吸附温度、溶液pH、吸附时间对废水中Cd2+吸附量与去除率的影响。结果表明，在25℃、pH=5时，4 g血粉对初始浓度为20 mg·L-1的镉离子溶液（100 mL）振荡吸附2 h后，溶液中剩余镉离子浓度为0.1 mg·L-1，Cd2+的去除率为99.38%，达到污水综合排放标准（GB 8978-1996）中镉排放限值0.1 mg·L-1；血粉对镉离子的吸附反应符合Langmuir等温吸附方程，可决系数为0.999 7，Cd2+的理论饱和吸附量为10.24 mg·g-1。为了使剩余Cd2+浓度达到更低（电镀废水排放标准），在吸附工艺上设计出2步吸附法，即第1次吸附后的混合液进行过滤，再将滤液加1 g血粉进行第2次吸附。结果表明，2步吸附法大大降低了溶液中剩余Cd2+离子浓度，即经过第1步、第2步吸附后，溶液中剩余Cd2+离子浓度降至0.006 mg·L-1，达到或低于电镀污染物排放标准（GB 21900-2008）对Cd2+的排放限值（0.05 mg·L-1）。这是常规吸附剂活性炭、石英砂、高岭土等所不能达到的技术指标，为废水去除Cd2+提供了一种可能的新技术。
    Abstract: High efficient removal of Cd2+ in wastewater by blood powder was reported in this research.The results showed that the removal rate of Cd2+ in wastewater reached to 99.38% when 100 mL wastewater with 20 mg·L-1 Cd2+ was adsorbed by 4 g blood powder adsorbent after 2 hours at 25℃ and pH 5.The adsorption isotherms of blood powder to Cd2+ could be described by the Langmuir isotherm model (R2=0.999 7). The value of maximum adsorption capacity was 10.24 mg·g-1 based on the analysis of Langmuir model. In order to get higher removal rate of Cd2+, two steps adsorption were performed. In the first step adsorption, 5 g blood powder was added into 100 mL wastewater with 20 mg·L-1 Cd2+ in vibration at 25℃ and pH 5, followed by filtration after 2 hours. Then another 1 g blood powder was further added into the filtrate for the second adsorption under the same conditions. The results showed that residual concentration of Cd2+ further reduced to 0.006 mg·L-1 after two steps of absorption, which reached the emission standard of wastewater (GB 21900-2008, Cd2+ -1). These data showed that the blood powder had the higher removal capability of Cd2+ than activated carbon, sand, kaolinite and other regular adsorbents. Our results demonstrated an alternative way to the treatment of Cd2+-containing wastewater.
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  • 收稿日期:  2017-01-17
  • 刊出日期:  2017-08-26

血粉对废水中镉离子的高效去除效应

  • 1. 湖北大学生命科学学院, 武汉 430062
  • 2. 湖北大学资源环境学院, 武汉 430062
  • 收稿日期:  2017-01-17
基金项目:

国家重点研发计划（2016YFD0200900）

摘要: 以屠宰场废弃动物血液为原料，经高温干燥、粉碎为血粉，以此血粉为吸附剂，研究血粉添加量、溶液初始浓度、吸附温度、溶液pH、吸附时间对废水中Cd2+吸附量与去除率的影响。结果表明，在25℃、pH=5时，4 g血粉对初始浓度为20 mg·L-1的镉离子溶液（100 mL）振荡吸附2 h后，溶液中剩余镉离子浓度为0.1 mg·L-1，Cd2+的去除率为99.38%，达到污水综合排放标准（GB 8978-1996）中镉排放限值0.1 mg·L-1；血粉对镉离子的吸附反应符合Langmuir等温吸附方程，可决系数为0.999 7，Cd2+的理论饱和吸附量为10.24 mg·g-1。为了使剩余Cd2+浓度达到更低（电镀废水排放标准），在吸附工艺上设计出2步吸附法，即第1次吸附后的混合液进行过滤，再将滤液加1 g血粉进行第2次吸附。结果表明，2步吸附法大大降低了溶液中剩余Cd2+离子浓度，即经过第1步、第2步吸附后，溶液中剩余Cd2+离子浓度降至0.006 mg·L-1，达到或低于电镀污染物排放标准（GB 21900-2008）对Cd2+的排放限值（0.05 mg·L-1）。这是常规吸附剂活性炭、石英砂、高岭土等所不能达到的技术指标，为废水去除Cd2+提供了一种可能的新技术。

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