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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Coupling Hydrothermal Treatment with Stripping Technology for Fast Ammonia Release and Effective Nitrogen Recovery from Chicken Manure
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Coupling Hydrothermal Treatment with Stripping Technology for Fast Ammonia Release and Effective Nitrogen Recovery from Chicken Manure

机译：汽提耦合水热处理与鸡粪中氨的快速释放和有效氮的回收

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摘要

In order to mitigate the environmental impacts associated with accelerated global N cycle, a hybrid pretreatment procedure combining hydrothermal treatment (HTT) with ammonia stripping was developed to effectively recover N as a valuable ammonia product from chicken manure (CM). Processing of the CM at 180 °C for 30 min resulted in a 208% increase in soluble organic carbon (SOC) and 46% conversion of organic-N to ammonia-N. Analysis of carbon mass balance revealed that carbohydrates, proteins, and volatile fatty acids (VFAs) were the major contributors to SOC (～100%) in the processed CM under this HTT condition. Further prolongation of holding time to 60 min or increase of HTT temperature to 220 °C resulted in some increase in ammonia yield but obvious decrease in SOC concentration and possible formation of inhibitory or nonbiodegradable products as well, compromising the practical value of the processed CM as feedstock for methane production. After ammonia recovery through a circulating stripping system coupled with acid absorption, methane production potentials of the resultant ammonia-stripped CM residue were assessed via 45 days' anaerobic digestion trials. Results from this work reflected an overall N recovery efficiency of 57% from CM and increase in methane yield by 24% (compared to those of raw CM).
机译：为了减轻与加速全球氮循环相关的环境影响，开发了将水热处理（HTT）与氨气汽提相结合的混合预处理程序，以从鸡粪（CM）中有效回收氮，将其作为有价值的氨产品。 CM在180°C下处理30分钟导致可溶性有机碳（SOC）增加208％，有机氮转化为氨氮的转化率为46％。对碳质量平衡的分析表明，在此HTT条件下，加工后的CM中碳水化合物，蛋白质和挥发性脂肪酸（VFA）是SOC的主要成分（约100％）。将保温时间进一步延长至60分钟或将高温还原温度提高至220°C，会导致氨产量增加，但SOC浓度明显降低，并可能形成抑制性或不可生物降解的产物，从而降低了加工后的CM的实用价值。甲烷生产原料。通过循环汽提系统回收氨气并结合酸吸收后，通过45天的厌氧消化试验评估了氨气汽提的CM残留物产生甲烷的潜力。这项工作的结果表明，CM的总氮回收效率为57％，甲烷产率提高了24％（与原始CM相比）。

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