多次干燥和湿润循环下新鲜和分解城市固体废物保水曲线的实验研究

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yuekai Xie, Jianfeng Xue
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引用次数: 0

摘要

由于环境条件的变化、有机物的分解和沥滤液的再循环,在垃圾填埋场处置的城市固体废物(MSWs)通常会经历干燥和湿润循环。本文研究了新鲜和降解的 MSW 在不同次数的干燥和湿润循环以及水和沥滤液暴露下的保水曲线(WRC)。结果表明,随着干燥和湿润循环次数的增加,城市固体废物的保水能力降低。在干燥和湿润循环的第一个循环中,所有都市固体废物样本都观察到了干燥和湿润循环之间的最大滞后现象。在干燥和湿润循环下,中度至高度分解的城市固体废物的水分保持率与土壤的水分保持率相似。由于分解和压缩会导致颗粒内水分的排出,因此新鲜都市固态固体废物的湿度分布系数会发生很大变化。无论是新鲜还是已分解的都市固态固体废物,在经过 3 次干燥和湿润循环后,其可湿性粉尘浓度都会趋于稳定。不过,我们只研究了空隙率相近、初始成分相同的城市固体废物。应进一步研究具有不同初始成分(如食物含量)和空隙率的都市固体废物的保水行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental investigations of water retention curves of fresh and decomposed municipal solid wastes under multiple drying and wetting cycles

Experimental investigations of water retention curves of fresh and decomposed municipal solid wastes under multiple drying and wetting cycles

Municipal solid wastes (MSWs) disposed in landfills are generally exposed to drying and wetting cycles because of the variation in environmental conditions, decomposition of organics and leachate recirculation. This paper studies the water retention curves (WRCs) of fresh and degraded MSWs under various numbers of drying and wetting cycles with water and leachate exposure. The result indicates that the water retention capacities of MSWs decrease with drying and wetting cycles. The maximum hysteresis between the drying and wetting cycles is observed in the first cycles for all MSW samples. The WRCs of medium to highly decomposed MSWs under drying and wetting cycles are similar to those of soils. The WRCs of fresh MSWs can undergo substantial changes due to the discharge of intra-particle moisture caused by decomposition and compression. For both fresh and decomposed MSWs, the WRCs stabilize after 3 drying and wetting cycles. However, only the MSWs of one initial composition with similar void ratios were investigated. Further research should be conducted to investigate the water retention behavior of MSWs with diverse initial compositions (e.g., food contents) and void ratios.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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