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Methane potential of industrial oil-clay by-product

机译:工业油 - 粘土副产物的甲烷潜力

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摘要

In this thesis suitability of industrial by-product oil-clay to produce biogas in anaerobic digestion was studied. Oil-clay (spent bleaching earth) contains high amounts of fats and clay (sand).The methane production potential was studied by methane production batch assay with two mesophilic and one thermophilic inoculum. Methane production potential of oil-clay was high in all assays ranging from 532 to 664 l CH4/kg substrate VS added and from 728 to 922 l CH4/kg substrate VS removed. The yield was close to the theoretical maximum of fats. No inhibition caused by high lipid content of the substrate was ob-served, only some differences in the lag phase before the methane production initiated. Pretreatment with alkali increased the soluble COD but it did not have an effect on the methane production potential of oil-clay in batch assay. Thermal pretreatment had no effect on soluble COD levels. The behavior of oil-clay in the anaerobic digestion vessel was observed to be problematic, because of its tendency to float and after wetting sink quickly to the bottom. The spent oil-clay is acidic (pH 3.5) causing the need to adjust the pH before feeding it to the digester.As a conclusion it can be postulated that oil-clay substrate used is a potent feedstock for methane production by anaerobic digestion. Its methane production potential is high and the volatile solids of the substrate are efficiently used for methanogenesis. However the acidic nature, high lipid content and behavior in the vessel need to be taken into account when planning full scale application. More studies with actual reactors and careful planning of the input amounts and processes are needed to evaluate this issue further.
机译:本文研究了工业副产品油泥在厌氧消化中生产沼气的适用性。油土(废漂白土)中含有大量的脂肪和粘土(沙土)。通过甲烷生产分批试验,使用两种嗜温和一种嗜热接种物,研究了甲烷的生产潜力。在添加532至664 l CH4 / kg底物VS和移除728至922 l CH4 / kg底物VS的所有测定中,油粘土的甲烷生产潜力都很高。产量接近脂肪的理论最大值。没有观察到由底物的高脂质含量引起的抑制,只有在甲烷产生开始之前的滞后阶段有一些差异。用碱预处理可增加可溶性COD的含量,但在分批测定中对油泥的甲烷生成潜力没有影响。热预处理对可溶性COD水平没有影响。观察到厌氧消化容器中油粘土的行为是有问题的,因为它倾向于漂浮并且在润湿后迅速沉到底部。用过的油泥是酸性的(pH 3.5),因此需要在将其送入蒸煮器之前调节pH值。因此,可以推断出所使用的油泥底物是用于厌氧消化生产甲烷的有效原料。它的甲烷生产潜力很高,并且底物的挥发性固体可有效地用于甲烷生成。但是,在计划全面应用时,必须考虑到容器的酸性,高脂质含量和行为。需要对实际反应堆进行更多研究,并仔细计划投入量和过程,才能进一步评估该问题。

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    Valtavaara Minna;

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  • 年度 2014
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