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Evaluation of the Fuel Value and Soil Application Potential of the Cadmium Contaminated Biochar Obtained after Water Treatment

机译：水处理后获得镉受污染的生物炭的燃料价值和土壤应用潜力的评价

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摘要

Spent biochar obtained after water treatment especially metal adsorption could be used as a solid fuel. In this study, soil application potential and fuel value of cadmium contaminated biochar was investigated. Biochar prepared from Parthenium (PBC) and the thermally modified biochar (MPBC) was artificially contaminated with different concentrations (1, 10, 50, 100 and 200 mg/l) of Cd solution. The contaminated PBC-Cd and MPBC-Cd was applied to a red soil, and their impact on soil biological activity, maize growth and Cd bioaccumulation was assessed. Maize growth was retarded due to the contaminated biochar. Soil and plant Cd concentrations increased significantly. The soil dehydrogenase (DHA) and fluorescein diacetate hydrolases enzyme activities were adversely affected. DHA reduced from 324 to 97 mg TPF/kg/24 h in MPBC-1 to MPBC-200, while in PBC-1 to PBC-200, DHA decreased from 422 to 112 mg TPF/kg/24 h. Cd contaminated biochars obtained after waste water treatment could not be used for soil application. Fuel values of contaminated biochar were analysed by the higher heating value of biochars and their fusibility indices. The high heating value of the biochar is comparable with the lignite. Raw biochar contains significant amount of alkali elements that affected their use as a fuel. However after adsorption, the washing of the biochar alkalies significantly improved the fuel properties, especially the propensity for slagging and fouling. Biochar used for treatment of contaminated waste water could be sustainably used as a solid fuel; however further studies are needed to manage the metal enriched ash generated after combustion of these contaminated biochar.
机译：在水处理之后获得的生物炭，尤其是金属吸附可以用作固体燃料。在本研究中，研究了镉污染生物炭的土壤应用势和燃料价值。由阳萘（PBC）制备的生物炭和热改性的生物炭（MPBC）用不同浓度（1,10,50,100和200mg / L）的CD溶液进行人工污染。将污染的PBC-CD和MPBC-CD施用于红壤，评估其对土壤生物活性，玉米生长和CD生物累积的影响。由于污染的生物炭因污染的生物炭而迟钝了玉米生长。土壤和植物CD浓度显着增加。土壤脱氢酶（DHA）和荧光素二乙酸酯水解酶活性受到不利影响。 DHA在MPBC-1至MPBC-200中从324℃降至97mg TPF / kg / 24小时，而在PBC-1至PBC-200中，DHA从422降至112 mg TPF / kg / 24小时。废水处理后获得的CD受污染的生物脉体不能用于土壤应用。通过Biochars的较高的加热值及其熔作用指数分析了污染的生物炭的燃料值。 Biochar的高加热值与褐煤相当。生物炭含有大量的碱性元素，影响其用作燃料。然而，在吸附后，BioChar碱的洗涤显着提高了燃料性能，尤其是脱渣和污垢的倾向。用于治疗受污染的废水的BioChar可以可持续地用作固体燃料;然而，需要进一步的研究来管理这些受污染的生物炭燃烧后产生的金属富集的灰。

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  • 来源
    《Solid Fuel Chemistry》 |2020年第6期|411-417|共7页
  • 作者

    Kumar S.; Kaushik G.; Masto R. E.;

  • 作者单位

    Cent Univ Rajasthan Sch Earth Sci Dept Environm Sci Kishangarh 305817 Rajasthan India|CSIR Cent Inst Min & Fuel Res Ind Biotechnol & Waste Utilizat Res Grp Digwadih Campus Dhanbad 828108 Bihar India;

    Cent Univ Rajasthan Sch Earth Sci Dept Environm Sci Kishangarh 305817 Rajasthan India;

    CSIR Cent Inst Min & Fuel Res Ind Biotechnol & Waste Utilizat Res Grp Digwadih Campus Dhanbad 828108 Bihar India;

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

    Biochar; bioaccumulation; fuel; ash fusibility; slagging;

    机译：生物炭;生物累积;燃料;灰熔;粘合;

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