Experimental study on the improvement of sludge by vacuum preloading-stepped electroosmosis method with prefabricated horizontal drain

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-04-09 DOI:10.1016/j.geotexmem.2024.04.001

Xiaoya Bian , Haodong Yang , Hui Liu , Zhiyao Xu , Rongjun Zhang

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Abstract

To improve the defects of low electroosmosis efficiency in the later stage and high energy consumption of conventional vacuum preloading combined with electroosmosis, the vacuum preloading-stepped electroosmosis method (VP-SEO) with prefabricated horizontal drain (PHD) was proposed for dredged sludge in this paper. In the test, waste concrete fine aggregate was used as the horizontal drainage cushion to alleviate the clogging of the PHD. The results showed that compared to vacuum preloading combined with electroosmosis (VP-EO), more drainage channels throughout the soil were produced after VP-SEO treatment, and VP-SEO could maintain a higher drainage efficiency in the later stage of treatment with improved final drainage and consolidation. The sludge treated by VP-SEO showed a significant increase in vane shear strength and a reduction in water content. Furthermore, the water loss and shrinkage of the soil surface after VP-SEO treatment were more uniform than that of VP-EO treatment, and the electroosmotic energy consumption and anode erosion were also lower. This study provides an effective improvement scheme for solidifying sludge with a high water content by conventional vacuum preloading combined with electroosmosis method.

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利用预制水平排水沟的真空预加载步进式电渗法改良污泥的实验研究

为改善传统真空预加载结合电渗后期电渗效率低、能耗高的缺陷，本文提出了带预制水平排水器（PHD）的真空预加载-分步电渗法（VP-SEO）来处理疏浚污泥。在试验中，废混凝土细骨料被用作水平排水垫，以减轻 PHD 的堵塞。结果表明，与真空预加载结合电渗法（VP-EO）相比，VP-SEO 处理后整个土壤中产生了更多的排水通道，而且 VP-SEO 在处理后期能保持较高的排水效率，最终排水和固结效果得到改善。经 VP-SEO 处理的污泥的叶片剪切强度显著提高，含水量降低。此外，VP-SEO 处理后土壤表面的失水和收缩比 VP-EO 处理更均匀，电渗能耗和阳极侵蚀也更低。这项研究为采用传统真空预加载结合电渗法固化高含水率污泥提供了一种有效的改进方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.