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Pilot-scale field study for ammonia removal from lagoon biogas using an acid wet scrubber

机译:使用酸性湿式洗涤塔从泻湖沼气中去除氨的中试研究

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摘要

The anaerobic activities in swine slurry storage and treatment generate biogas containing gaseous ammonia component which is a chemical agent that can cause adverse environmental impacts when released to the atmosphere. The aim of this pilot plant study was to remove ammonia from biogas generated in a covered lagoon, using a sulfuric acid wet scrubber. The data showed that, on average, the biogas contained 43.7 ppm of ammonia and its concentration was found to be exponentially related to the air temperature inside the lagoon. When the air temperature rose to 35℃ and the biogas ammonia concentration reached 90 ppm, the mass transfer of ammonia/ammonium from the deeper liquid body to the interface between the air and liquid became a limiting factor. The biogas velocity was critical in affecting ammonia removal efficiency of the wet scrubber. A biogas flow velocity of 8 to 12 mm s~(-1) was recommended to achieve a removal efficiency of greater than 60%. Stepwise regression revealed that the biogas velocity and air temperature, not the inlet ammonia concentration in biogas, affected the ammonia removal efficiency. Overall, when 73 g L~(-1) (or 0.75 M) sulfuric acid solution was used as the scrubber solution, removal efficiencies varied from 0% to 100% with an average of 55% over a 40-d measurement period. Mass balance calculation based on ammonium-nitrogen concentration in final scrubber liquid showed that about 21.3 g of ammonia was collected from a total volume of 1169 m~3 of biogas, while the scrubber solution should still maintain its ammonia absorbing ability until its concentration reaches up to 1 M. These results showed promising use of sulfuric acid wet scrubber for ammonia removal in the digester biogas.
机译:猪粪浆储存和处理中的厌氧活动会产生含有气态氨成分的沼气,该气态氨是一种化学试剂,当释放到大气中时会造成不利的环境影响。该中试工厂研究的目的是使用硫酸湿式洗涤塔从有盖泻湖中产生的沼气中除去氨。数据显示,平均而言,沼气中含有43.7 ppm的氨,其浓度与泻湖内的空气温度呈指数关系。当空气温度升至35℃且沼气中的氨浓度达到90 ppm时,氨/铵从较深的液体到空气与液体之间的界面的传质成为限制因素。沼气速度对于影响湿式洗涤器的氨去除效率至关重要。推荐的沼气流速为8至12 mm s〜(-1),以实现大于60%的去除效率。逐步回归表明,沼气速度和空气温度而不是沼气中的进口氨浓度会影响氨的去除效率。总体而言,当使用73 g L〜(-1)(或0.75 M)硫酸溶液作为洗涤塔溶液时,在40天的测量时间内,去除效率从0%到100%不等,平均为55%。根据最终洗涤塔液中氨氮浓度的质量平衡计算表明,从总体积为1169 m〜3的沼气中收集到约21.3 g氨,而洗涤塔液仍应保持其氨吸收能力,直到其浓度升高为止。至1M。这些结果表明,有望将硫酸湿式洗涤塔用于消化池沼气中的氨去除。

著录项

  • 来源
    《Journal of environmental science and health》 |2014年第6期|439-448|共10页
  • 作者单位

    Department of Bioproducts & Biosystems Engineering, University of Minnesota, St. Paul, Minnesota, USA;

    Department of Bioproducts & Biosystems Engineering, University of Minnesota, St. Paul, Minnesota, USA;

    Southern Research and Outreach Center, University of Minnesota, Waseca, Minnesota, USA;

    Department of Bioproducts & Biosystems Engineering, University of Minnesota, St. Paul, Minnesota, USA,Southern Research and Outreach Center, University of Minnesota, Waseca, Minnesota, USA,Department of Biological and Agricultural Engineering, 215 White Engineering Hall, University of Arkansas Fayetteville, AR 72701, USA;

    Department of Food, Agricultural, and Biological Engineering, the Ohio State University, Columbus, Ohio, USA;

    Department of Food, Agricultural, and Biological Engineering, the Ohio State University, Columbus, Ohio, USA;

    Department of Food, Agricultural, and Biological Engineering, the Ohio State University, Columbus, Ohio, USA;

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

    Adsorption; ammonia removal; anaerobic digestion; biogas cleaning; wet scrubber;

    机译:吸附;除氨厌氧消化;沼气清洁;湿式洗涤器;

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