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首页> 外文期刊>Environmental Science & Technology >Heavy Metal Removal from Sewage Sludge Ash by Thermochemical Treatment with Gaseous Hydrochloric acid
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Heavy Metal Removal from Sewage Sludge Ash by Thermochemical Treatment with Gaseous Hydrochloric acid

机译：气态盐酸热化学处理去除污泥中的重金属

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摘要

Sewage sludge ash (SSA) is a suitable raw material for fertilizers due to its high phosphorus (P) content However, heavy metals must be removed before agricultural application and P should be transferred into a bioavailable form.The utilization of gaseous hydrochloric acid for thermochemical heavy metal removal from SSA at approximately 1000 ℃ was investigated and compared to the utilization of alkaline earth metal chlorides. The heavy metal removal efficiency increased as expected with higher gas concentration, longer retention time and higher temperature. Equivalent heavy metal removal efficiency were achieved with these different Cl-donors under comparable conditions (150 g Cl/kg SSA, 1000 ℃). In contrast, the bioavailability of the P-bearing compounds present in the SSA after thermal treatment with gaseous HC1 was not as good as the bioavailability of the P-bearing compounds formed by the utilization of magnesium chloride. This disadvantage was overcome by mixing MgCO_3 as an Mg-donor to the SSA before thermochemical treatment with the gaseous Cl-donor. A test series under systematic variation of the operational parameters showed that copper removal is more depending on the retention time than the removal of zinc Zn-removal was declined by a decreasing ratio of the partial pressures of ZnCl_2 and water.
机译：污水污泥灰（SSA）由于磷（P）含量高，因此是肥料的合适原料。但是，在农业应用之前必须去除重金属，并且应将P转化为生物利用形式。气态盐酸在热化学中的利用研究了在大约1000℃下从SSA中去除重金属的情况，并将其与碱土金属氯化物的利用进行了比较。随着更高的气体浓度，更长的保留时间和更高的温度，重金属去除效率如预期的那样提高。在可比的条件下（150 g Cl / kg SSA，1000℃），使用这些不同的Cl供体可以达到等效的重金属去除效率。相反，在用气态HCl热处理后，SSA中存在的含P化合物的生物利用度不如利用氯化镁形成的含P化合物的生物利用度。通过在用气态氯供体进行热化学处理之前将作为Mg供体的MgCO_3与SSA混合，克服了这一缺点。在一系列操作参数的系统变化下进行的测试表明，铜的去除更多地取决于保留时间，而不是锌的去除。Zn的去除因ZnCl_2和水的分压的降低而降低。

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  • 来源
    《Environmental Science & Technology》 |2011年第17期|p.7445-7450|共6页
  • 作者

    Christian Vogel; Christian Adam;

  • 作者单位

    Division 4.3 Waste Treatment and Remedial Engineering, BAM Federal Institute for Materials Research and Testing,Unter den Eichen 87, D-12205 Berlin;

    Division 4.3 Waste Treatment and Remedial Engineering, BAM Federal Institute for Materials Research and Testing,Unter den Eichen 87, D-12205 Berlin;

  • 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);
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  • 正文语种 eng
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