Strategies are proposed for the anaerobic treatment of lipid and phenolic-rich effluents, specifically the raw olive mill wastewater (OMW). Two reactors were operated under OMW influent concentrations from 5 to 48 g COD L-1 and Hydraulic Retention Time between 10 and 5 days. An intermittent feeding was applied whenever the reactors showed a severe decay in the methane yield. This strategy improved the mineralization of oleate and palmitate, which were the main accumulated Long Chain Fatty Acids (LCFA), and also promoted the removal of resilient phenolic compounds, reaching remarkable removal efficiencies of 60% and 81% for two parallel reactors at the end of a feed-less period. A maximum biogas production of 1.4 m3 m-3 d-1 at an Organic Loading Rate of 4.8 kg COD m-3 d-1 was obtained. Patterns of individual LCFA oxidation during the OMW anaerobic digestion are presented and discussed for the first time. The supplementation of a nitrogen source boosted immediately the methane yield from 21 and 18 to 76 and 93% in both reactors. The typical problems of sludge flotation and washout during the anaerobic treatment of this oily wastewater were overcome by biomass retention, according to the Inverted Anaerobic Sludge Blanket (IASB) reactor concepts. This work demonstrates that it is possible to avoid a previous detoxification step by implementing adequate operational strategies to the anaerobic treatment of OMW.
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机译:提出了对脂质和富含酚的废水,特别是橄榄磨原废水(OMW)进行厌氧处理的策略。两个反应器在5至48 g COD L-1的OMW进水浓度和10至5天的水力停留时间下运行。每当反应器显示甲烷收率严重下降时,都要进行间歇进料。该策略改善了油酸和棕榈酸酯的矿化作用,它们是主要积累的长链脂肪酸(LCFA),并且还促进了弹性酚类化合物的去除,最终两个并联反应器的去除效率分别达到60%和81%没有饲料的时期。在有机负载率为4.8千克COD m-3 d-1的情况下,最大沼气产量为1.4 m3 m-3 d-1。首次介绍和讨论了OMW厌氧消化过程中单个LCFA氧化的模式。在两个反应器中,氮源的补充立即将甲烷产率从21和18提高到76和93%。根据倒置厌氧污泥毯子(IASB)反应器的概念,厌氧处理含油废水的过程中典型的污泥浮选和冲洗问题可以通过生物质截留来解决。这项工作表明,可以通过对OMW的厌氧处理实施适当的操作策略来避免先前的排毒步骤。
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