LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France; Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino (FR), Italy; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France.
Bioresour Technol. 2017 May;232:93-102. doi: 10.1016/j.biortech.2017.01.060. Epub 2017 Jan 30.
In anaerobic leach-bed reactors (LBRs) co-digesting an easily- and a slowly-degradable substrate, the importance of the leachate flush both on extracting volatile fatty acids (VFAs) at the beginning of newly-started batches and on their consumption in mature reactors was tested. Regarding VFA extraction three leachate flush-rate conditions were studied: 0.5, 1 and 2LkgTSd. Results showed that increasing the leachate flush-rate during the acidification phase is essential to increase degradation kinetics. After this initial phase, leachate injection is less important and the flush-rate could be reduced. The injection in mature reactors of leachate with an acetic acid concentration of 5 or 10gL showed that for an optimized VFA consumption in LBRs, VFAs should be provided straight after the methane production peak in order to profit from a higher methanogenic activity, and every 6-7h to maintain a high biogas production rate.
在同时消化易降解和难降解底物的厌氧渗滤床（LBR）反应器中，测试了渗滤液冲洗对新启动批次初期提取挥发性脂肪酸（VFAs）以及在成熟反应器中消耗 VFAs 的重要性。关于 VFA 提取，研究了三种渗滤液冲洗速率条件：0.5、1 和 2LkgTSd。结果表明，在酸化阶段增加渗滤液冲洗速率对于提高降解动力学至关重要。在初始阶段之后，渗滤液的注入就不那么重要了，冲洗速率可以降低。在成熟的反应器中注入乙酸浓度为 5 或 10gL 的渗滤液表明，为了使 LBR 中 VFA 得到最佳消耗，应该在甲烷产生高峰后立即提供 VFAs，以便从更高的产甲烷活性中获益，并且每隔 6-7h 提供一次以维持高沼气产生率。
