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首页> 外文期刊>Journal of environmental science and health >Evaluation of anaerobic co-digestion of dairy manure with food wastes via bio-methane potential assay and CSTR reactor
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Evaluation of anaerobic co-digestion of dairy manure with food wastes via bio-methane potential assay and CSTR reactor

机译:通过生物甲烷潜力测定和CSTR反应器评估奶牛粪与食物残渣的厌氧共消化

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摘要

The introduction of food wastes into anaerobic digestion (AD) brings a promising scenario of increasing feedstock availability and overall energy production from AD. This study evaluated the biodegradability and methane potential from co-digestion of two typical food wastes, kitchen waste and chicken fat, with dairy manure. For single substrate, the bio-methane potential assays showed that kitchen waste had the highest methane yield of 352 L-CH_4 kg~(-1)-VS added, 92% more than dairy manure alone. Chicken fat at the same Volatile Solid (VS) level (2 g L~(-1)) inhibited bio-methane production. Addition of kitchen waste and chicken fat to a VS percentage of up to 40% improved overall methane yield by 44% and 34%, respectively. Synergistic effect was observed when either combining two or three substrates as AD feedstock, possibly as a result of increased biodegradability of organic materials in chicken fat and kitchen waste compared with dairy manure. Addition of chicken fat improved methane yield more than kitchen waste. However, addition of chicken fat VS over 0.8 g L~(-1) should be cautiously done because it may cause reactor failure due to decrease in pH. The maximum methane yield was 425 L-CH_4 kg~(-1)-VS, achieved at a VS ratio of 2:2:1 for kitchen waste, chicken fat, and dairy manure. Results from batch AD experiment demonstrated that supplementing dairy manure to chicken fat and/or kitchen waste improved alkalinity of substrate due to the inclusion of more titratable bases in dairy manure, and therefore stabilized the methanogenesis and substantially improved biogas yield. A mixture of substrates of kitchen waste, chicken fat, and dairy manure at a ratio of 1:1:3 was fed to a continuously stirred tank reactor operated at organic loading rates of 3.28, 6.55, and 2.18 g-COD L~(-1)-day (hydraulic retention time of 20, 10, and 30 days, respectively) under mesophilic condition, and methane production rate reached 0.65,0.95, and 0.34 L-CH_4 L~(-1) -reactor-day.
机译:将餐厨垃圾引入厌氧消化(AD)带来了一个前景广阔的前景,即提高了AD的原料利用率和整体能源产量。这项研究评估了两种典型食物垃圾(厨房垃圾和鸡肉脂肪)与奶牛粪便共同消化产生的生物降解性和甲烷潜力。对于单一基质,生物甲烷潜力测定表明,厨余垃圾的甲烷产量最高,为352 L-CH_4 kg〜(-1)-VS,比单独的乳牛粪多92%。在相同挥发性固体(VS)水平(2 g L〜(-1))下的鸡肉脂肪抑制了生物甲烷的产生。在VS百分比高达40%的情况下添加厨余垃圾和鸡肉脂肪,可使甲烷总产率分别提高44%和34%。当结合两种或三种底物作为AD原料时,观察到了协同作用,这可能是由于与牛粪相比,鸡脂肪和厨房废物中有机物质的生物降解性提高了。鸡脂肪的添加比厨房垃圾更能提高甲烷产量。但是,应谨慎添加超过0.8 g L〜(-1)的鸡脂肪VS,因为它可能会由于pH降低而导致反应器故障。厨余垃圾,鸡肉脂肪和奶牛粪的VS比为2:2:1时,最大甲烷产量为425 L-CH_4 kg〜(-1)-VS。批量AD实验的结果表明,向鸡脂肪和/或厨房废物中添加乳牛粪肥可改善基质的碱度,这是因为在乳牛粪便中包含更多可滴定的碱,因此稳定了甲烷生成作用,并显着提高了沼气产量。将厨余垃圾,鸡肉脂肪和奶牛粪便的底物混合物按1:1:3的比例进料到以3.28、6.55和2.18 g-COD L〜(- 1)天(中温条件下的水力停留时间分别为20、10和30天),甲烷生成率分别达到0.65、0.95和0.34 L-CH_4 L〜(-1)-反应器天。

著录项

  • 来源
    《Journal of environmental science and health》 |2015年第3期|217-227|共11页
  • 作者单位

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

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

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

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

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

    Department of Bioproducts and Biosystems Engineering, University of Minnesota, 316 BAE, 1390 Eckles Ave., Saint Paul, MN 55108-6005, USA;

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

    Co-digestion; bio-methane potential (BMP); chicken fat; food waste; kitchen waste; synergistic effect;

    机译:共消化;生物甲烷潜力(BMP);鸡肉脂肪食物浪费;厨房垃圾;协同效应;

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