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RHEOLOGICAL PROPERTIES OF ANAEROBICALLY DIGESTED SOLID WASTES

机译:厌氧消化固体废物的流变特性

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摘要

Anaerobic digestion for the treatment of solid wastes is mostly performed by dry digestion technologies (Total Solid > 20%). Because of the low water content, incoming and fermenting wastes are pasty matrixes, and pumping of fresh waste as well as a good mixing efficiency are a challenge at the industrial scale. Despite the economical importance of dry digestion, the rheology of digested solid wastes is poorly characterized in the literature. One reason for this information deficit is the lack of a suitable apparatus to measure the heterogeneous media of digestates composed of coarse particles. For these types of wastes, it is impossible to use conventional moving-piece rheometers. We developed a practical and rapid rheometrical test for the analysis of real anaerobic digested solid wastes containing coarse particles. A “slump test”, mainly used in concrete industries, was built specifically to this purpose: yield stress can be estimated from the final slump height. Regarding the behavior of the slump, we conclude that digestates behave as viscoelastic materials. The yield stress of different digested Organic Fraction of Municipal Solid Waste (OFMSW) was measured and ranged between 200 and 800 Pa. An exponential law can be used to correlated yield stress and Total Solids content.
机译:用于固体废物处理的厌氧消化主要通过干消化技术进行(固体总量> 20%)。由于含水量低,进入的废物和发酵的废物都是糊状基质,新鲜废物的泵送以及良好的混合效率是工业规模的挑战。尽管干法消化在经济上很重要,但消化后的固体废物的流变学在文献中却很差。这种信息不足的一个原因是缺乏一种合适的仪器来测量由粗颗粒组成的消化物的非均质介质。对于这些类型的废物,不可能使用常规的移动式流变仪。我们开发了一种实用且快速的流变测试,用于分析含有粗颗粒的真实厌氧消化固体废物。为此专门建立了主要用于混凝土行业的“坍落度测试”:可以从最终坍落度高度估算屈服应力。关于坍落度的行为,我们得出结论,消化物表现为粘弹性材料。测量了城市生活垃圾中不同消化有机部分的屈服应力,其屈服应力介于200至800 Pa之间。可以使用指数定律将屈服应力与总固体含量关联起来。

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