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首页> 外文期刊>Journal of Contaminant Hydrology >Leaching potential of pervious concrete and immobilization of Cu, Pb and Zn using pervious concrete
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Leaching potential of pervious concrete and immobilization of Cu, Pb and Zn using pervious concrete

机译：透水混凝土的浸出潜力和透水混凝土固定Cu，Pb和Zn

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摘要

This paper investigates the leaching potential of pervious concrete and its capacity for immobilizing Cu, Pb and Zn, which are common contaminants in urban runoff. Batch experiments showed that the teachability of Cu, Pb and Zn increased when pH ＜ 8. According to PHREEQC equilibrium modeling, the leaching of major ions and trace metals was mainly controlled by the dissolution/precipitation and surface complexation reactions, respectively. A 1-D reactive transport experiment was undertaken to better understand how pervious concrete might function to attenuate contaminant migration. A porous concrete block was sprayed with low pH water (pH = 4.3 ± 0.1) for 190 h. The effluent was highly alkaline (pH ～ 10 to 12). In the first 50 h, specific conductance and trace-metal were high but declined towards steady state values. PHREEQC modeling showed that mixing of interstitial alkaline matrix waters with capillary pore water was required in order to produce the observed water chemistry. The interstitial pore solutions seem responsible for the high pH values and relatively high concentrations of trace metals and major cations in the early stages of the experiment. Finally, pervious concrete was sprayed with a synthetic contaminated urban runoff (10 ppb Cu, Pb and Zn) with a pH of 4.3 ± 0.1 for 135 h. It was found that Pb immobilization was greater than either Cu or Zn. Zn is the most mobile among three and also has the highest variation in the observed degree of immobilization.
机译：本文研究了渗透性混凝土的浸出潜力及其固定化Cu，Pb和Zn的能力，Cu，Pb和Zn是城市径流中的常见污染物。批处理实验表明，当pH ＜8时，Cu，Pb和Zn的示教性提高。根据PHREEQC平衡模型，主要离子和微量金属的浸出主要受溶解/沉淀和表面络合反应控制。进行了一维反应运输实验，以更好地了解透水混凝土如何发挥作用来减少污染物的迁移。用低pH值的水（pH = 4.3±0.1）喷洒多孔混凝土块190小时。废水呈强碱性（pH〜10至12）。在最初的50小时内，电导率和痕量金属较高，但下降至稳态值。 PHREEQC模型表明，为了产生可观察到的水化学性质，需要将间隙性碱性基质水与毛细孔水混合。在实验的早期阶段，间隙孔隙溶液似乎是造成高pH值和较高浓度的痕量金属和主要阳离子的原因。最后，将渗透性混凝土用pH值为4.3±0.1的合成污染城市径流（10 ppb铜，铅和锌）喷洒135小时。发现Pb的固定化大于Cu或Zn。锌是三种中最易移动的，并且在固定化程度上的变化也最大。

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  • 来源
    《Journal of Contaminant Hydrology》 |2014年第6期|35-48|共14页
  • 作者

    U. Solpuker; J. Sheets; Y. Kim; F.W. Schwartz;

  • 作者单位

    School of Earth Sciences, The Ohio State University, 125 S. Oval Mall, Columbus, OH 43210, USA;

    School of Earth Sciences, The Ohio State University, 125 S. Oval Mall, Columbus, OH 43210, USA;

    Korea Institute of Geoscience and Mineral Resources (KIGAM), 92 Gwahang-no, Yuseong-gu, Daejeon 305-350, Republic of Korea;

    School of Earth Sciences, The Ohio State University, 125 S. Oval Mall, Columbus, OH 43210, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pervious concrete; Urban runoff; PHREEQC; Trace metal; Leaching; Immobilization;

    机译：透水混凝土;城市径流;PHREEQC;微量金属;浸出固定;

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