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首页> 外文期刊>Environmental Science & Technology >Electrochemical Nutrient Recovery Enables Ammonia Toxicity Control and Biogas Desulfurization in Anaerobic Digestion
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Electrochemical Nutrient Recovery Enables Ammonia Toxicity Control and Biogas Desulfurization in Anaerobic Digestion

机译：电化学营养物回收可实现厌氧消化中氨的毒性控制和沼气脱硫

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摘要

Organic waste streams can be valorized and reduced in volume with anaerobic digestion (AD). An often-encountered key issue however is the high ammonium (NH_4~+) content of certain waste streams. Ammonia (NH_3), in equilibrium with NH_4~+, is a toxic compound to the methanogenic community, which limits the organic loading rate and endangers process stability. An electrochemical system (ES) linked to a digester could, besides recovering this nutrient, decrease NH_3 toxicity through electrochemical extraction. Therefore, two digesters with and without ES attached in the recirculation loop were operated to test whether the ES could control NH_3 toxicity. During periods of high ammonium loading rates, the methane (CH_4) production of the ES-coupled reactor was up to 4.5 times higher compared to the control, which could be explained through simultaneous NH_4~+ extraction and electrochemical pH control. A nitrogen flux of 47 g N m~(-2) membrane d~(-1) could be obtained in the ES-coupled reactor, resulting in a current and removal efficiency of 38 ± 5% and 28 ± 2%, respectively, at an electrochemical power input of 17 ± 2 kWh kg~(-1) N. The anode also oxidized sulfide, resulting in a significantly lower H_2S emission via the biogas. Lastly, limited methanogenic community dynamics pointed to a nonselective influence of the different operational conditions.
机译：可以利用厌氧消化（AD）来增值有机废物流并减少其体积。然而，经常遇到的关键问题是某些废物流中的高铵（NH_4〜+）含量。氨（NH_3）与NH_4〜+处于平衡状态，是对产甲烷菌群落的有毒化合物，限制了有机负载率并危及工艺稳定性。连接到蒸煮器的电化学系统（ES）除了回收这种营养素外，还可以通过电化学提取降低NH_3的毒性。因此，操作了在循环回路中连接和不连接ES的两个消化器，以测试ES是否可以控制NH_3毒性。在高铵负载量期间，ES偶联反应器的甲烷（CH_4）产量比对照高4.5倍，这可以通过同时NH_4〜+萃取和电化学pH控制来解释。在ES耦合反应器中可获得47 g N m〜（-2）膜d〜（-1）的氮通量，电流和去除效率分别为38±5％和28±2％。在电化学输入功率为17±2 kWh kg〜（-1）N时，阳极还会氧化硫化物，从而显着降低通过沼气的H_2S排放。最后，有限的产甲烷群落动力学表明了不同操作条件的非选择性影响。

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  • 来源
    《Environmental Science & Technology》 |2015年第2期|948-955|共8页
  • 作者

    Joachim Desloover; Jo De Vrieze; Maarten Van de Vijver; Jacky Mortelmans; Rene Rozendal; Korneel Rabaey;

  • 作者单位

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

    Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium;

  • 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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