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首页> 外文期刊>The Science of the Total Environment >Remediation of internal phosphorus loads with modified clays, influence of fluvial suspended particulate matter and response of the benthic macroinvertebrate community
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Remediation of internal phosphorus loads with modified clays, influence of fluvial suspended particulate matter and response of the benthic macroinvertebrate community

机译：改性粘土对内部磷负荷的修复，河流悬浮颗粒物的影响以及底栖大型无脊椎动物群落的响应

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摘要

Clay-based phosphorus (P) sorbents have been increasingly used as geoengineering materials for the management sediment-derived internal P loading in eutrophic lakes. However, the long-term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter (SPM), and their effect on macroinvertebrate communities occupying dynamic regions at the sediment-water interface of shallow and turbid lakes. In this study, field mesocosm experiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum-modified bentonite (LMB) and thermally-modified calcium-rich attapulgite (TCAP) on sediment internal P loading and to assess their influence on macroinvertebrate community structure. A complementary laboratory core incubation study was also undertaken to investigate the effects of SPM deposition on LMB and TCAP performance. In the field, both LMB and TCAP effectively intercepted P released from sediment for up to five months. A P fractionation analysis indicated that LMB and TCAP application results in a substantial increase in inert P fractions in sediment Laboratory studies indicated that deposition of SPM may increase in mobile P both in the upper sediment and across the new post-SPM deposition sediment-water interface. Importantly, a comparison of sediment chemical extractions and estimated P fluxes suggests that chemically-defined forms of P in the sediment may be used as a proxy to estimate the net sediment P flux. Significantly, the surficial application of either LMB or TCAP did not cause negative effects on macroinvertebrate communities. This study indicates mat to sustain a low P flux across the sediment-water interface in shallow, turbid lakes, repeat dosing of geoengineering materials, temporally aligned to the deposition of fluvial SPM, may be required.
机译：粘土基磷（P）吸附剂已越来越多地用作地球工程材料，用于管理富营养化湖泊中沉积物引起的内部P负荷。然而，这些吸附剂的长期行为以及它们对悬浮颗粒物（SPM）下埋葬的反应以及对浅水和浑浊湖泊沉积物-水界面上占据动态区域的大型无脊椎动物群落的影响仍然难以捉摸。在这项研究中，我们在中国巢湖进行了中观实验，研究了镧改性的膨润土（LMB）和热改性的富钙凹凸棒土（TCAP）对沉积物内部P负荷的影响并评估了它们的含量。对大型无脊椎动物群落结构的影响。还进行了补充实验室核心孵化研究，以调查SPM沉积对LMB和TCAP性能的影响。在野外，LMB和TCAP都可以有效拦截长达五个月的沉积物中的磷释放。 P分馏分析表明，LMB和TCAP的应用导致沉积物中惰性P组分的大量增加实验室研究表明，SPM的沉积可能会增加上部沉积物中和整个SPM后沉积物-水界面中的移动性P。重要的是，对沉积物化学提取物和估计的P通量的比较表明，沉积物中P的化学定义形式可以用作估计净沉积物P通量的代理。值得注意的是，LMB或TCAP的表面应用并未对大型无脊椎动物群落造成负面影响。这项研究表明，要在浑浊的浅水湖泊中的泥沙-水界面上维持低P通量，可能需要重复配给地球工程材料，并在时间上与河流SPM的沉积保持一致。

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  • 来源
    《The Science of the Total Environment》 |2018年第1期|101-110|共10页
  • 作者

    Hongbin Yin; Grant B. Douglas; Yongjiu Cai; Cheng Liu; Diego Copetti;

  • 作者单位

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing. China;

    CSIRO Land and Water, Centre for Environment and Life Sciences. Private Bag 5, Wembley, WA 6913, Australia;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing. China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008 Nanjing. China;

    Water Research Institute, National Research Council of Italy, IRSA-CNR, Via del Mulino, 19, 20861 Brugherio, MB. Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sediment internal P management; Geoengineering materials; Suspended particulate matter; P flux; Benthic macroinvertebrate community;

    机译：泥沙内部磷管理;地球工程材料;悬浮颗粒物;P通量底栖大型无脊椎动物群落;

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