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首页> 外文期刊>Applied Microbiology and Biotechnology >Effects of support material on the pattern of volatile fatty acid accumulation at overload in anaerobic digestion of semi-solid waste
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Effects of support material on the pattern of volatile fatty acid accumulation at overload in anaerobic digestion of semi-solid waste

机译：载体材料对半固体废物厌氧消化超负荷时挥发性脂肪酸积累模式的影响

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摘要

Anaerobic degradation of a semi-solid waste with a total solids content of 4% particulate matter, much of it insoluble, was investigated in four laboratory-scale reactors. Two of the reactors were equipped with different textile materials for immobilisation of microorganisms, while the other two were used as continuously-stirred-tank reactor references, A constant organic loading rate and hydraulic retention time were used in the start-up period; the hydraulic retention time was then decreased and the effects of this change were monitored. Volatile fatty acid (VFA) concentration and pH were chosen as indicators of the microbial status in the reactors. The reactors with support material showed a greater resistance to overload than did the continuously-stirred-tank reactors. This is in agreement with many studies undertaken on the anaerobic treatment of wastewater. However, no problems with clogging occurred, showing that a support material is also applicable in systems treating waste containing large amounts of insoluble, particulate matter. The pH was comparable to VFA for indicating an approaching process failure. However, the pattern of VFA accumulation was qualitatively different between the reactors with and without support material, Obviously the metabolic pattern of mixed cultures changes when the microorganisms are immobilised.
机译：在四个实验室规模的反应器中研究了总固体含量为4％的颗粒状固体（大部分不溶）的半固体废物的厌氧降解。两个反应器配备了用于固定微生物的不同纺织材料，而其他两个用作连续搅拌槽反应器参考，在启动阶段使用了恒定的有机负荷率和水力停留时间。然后减少了水力停留时间，并监测了这种变化的影响。选择挥发性脂肪酸（VFA）的浓度和pH作为反应器中微生物状态的指标。带有载体材料的反应堆显示出比连续搅拌罐式反应堆更大的抗过载能力。这与废水厌氧处理的许多研究一致。但是，没有发生堵塞的问题，表明载体材料也可用于处理含有大量不溶性颗粒物的废物的系统。 pH值与VFA相当，表明接近工艺失败。然而，在有和没有载体材料的反应器之间，VFA积累的模式在质量上是不同的。显然，固定微生物时，混合培养物的代谢模式会发生变化。

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