生活垃圾填埋场高含盐量渗滤液污泥的水泥固化特性试验研究

宋树祥; 郑超; 杨昆; 冯德銮

doi:10.3724/j.gyjzG22110711

生活垃圾填埋场高含盐量渗滤液污泥的水泥固化特性试验研究

doi: 10.3724/j.gyjzG22110711

宋树祥¹,
郑超¹,
杨昆¹,
冯德銮^2, ,

1. 广州环投环境服务有限公司, 广州 510180;
2. 广东工业大学土木与交通工程学院, 广州 510006

详细信息

作者简介:
宋树祥,高级工程师,主要从事固体废物处置等工作,ghtsongshuxiang@126.com。

通讯作者:
冯德銮,博士,讲师,主要从事岩土工程方面的教学与科研工作,wolfluan@126.com。

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- 被引次数: 2
出版历程
- 收稿日期: 2022-11-07
- 网络出版日期: 2025-04-02

Experimental Research on Curing Characteristics of Sludge with High-Salt- Content Leachate Solidified by Cement in Domestic Waste Landfills

1. GZ Environmental Protection Investment Group Co., Ltd., Guangzhou 510180, China;
2. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China

摘要

摘要: 采用浸没燃烧工艺产生的生活垃圾填埋场渗滤液污泥具有有机质含量和重金属含量低但液性指数和含盐量高的特点,属于新型污泥。分别采用普通硅酸盐水泥和硫铝酸盐水泥固化渗滤液污泥,对固化污泥试样进行无侧限抗压强度试验和浸泡试验,以评估水泥对高含盐量渗滤液污泥的强度和水稳定性的加固效果;同时,对固化污泥试样进行微观测试,以探索水泥固化效应的微观控制机制。结果表明:1)普通硅酸盐水泥对高含盐量渗滤液污泥的固化效果不理想;2)掺入10%的硫铝酸盐水泥,固化污泥养护28 d的无侧限抗压强度满足填埋要求;3)当硫铝酸盐水泥的掺量不小于50%时,养护28 d的固化污泥试样浸泡28 d后的无侧限抗压强度能满足填埋要求;4)硫铝酸盐水泥掺入后所生成的具有胶结效应的C-S-H凝胶,导致污泥的微观结构更加致密,是硫铝酸盐水泥固化高含盐量渗滤液污泥强度提升的微观控制机制;5)硫铝酸盐水泥固化试样内部可溶盐污泥颗粒随浸泡时间的增加逐渐溶解并引致C-S-H凝胶的断裂和散落及诱发微观胶结形态破坏,是硫铝酸盐水泥固化高含盐量渗滤液污泥浸水劣化的微观控制机制。
- 渗滤液污泥 /
- 极高含盐量 /
- 固化稳定化 /
- 微观机理 /
- 水稳定性
Abstract: The landfill leachate sludge produced by submerged combustion process has the characteristics of low organic matter content and heavy metal content but high liquid index and salt content. Ordinary Portland cement and sulphoaluminate cement with different cement types and cement contents were used to solidifiy leachate sludge. The unconfined compressive strength test and immersion test were carried out to evaluate the reinforcement effect of cement on the strength and water stability of high-salt-content leachate sludge. Meanwhile, microscopy tests were carried out on the solidified sludge samples to explore the micro-control mechanism of cement solidification effect. The test results showed that: 1) the curing effect of ordinary Portland cement on sludge with high-salt-content leachate was non-ideal;2) the unconfined compressive strength of solidified sludge with 10% sulfoaluminate cement content for 28 d curing age met the strength requirement of solidified sludge landfills; 3) when the content of sulphoaluminate cement was more than 50%, the unconfined compressive strength of solidified sludge with curing age of 28 days after being immersed for 28 days could meet the landfill requirement of 50 kPa;4) C-S-H gel with cementing effect produced by the addition of sulphoaluminate cement caused the microstructure of the sludge to be more compact, which was the micro-control mechanism for the strength enhancement of sludge in sulphoaluminate cement solidified leachate with high salt content; 5) the soluble salt sludge particles in the sample solidified by sulphoaluminate cement gradually dissolved with the increase of immersion time, which led to the fracture and dispersion of C-S-H gel and the destruction of micro-cementing morphology, it was the micro-control mechanism for the immersion deterioration of sulphoaluminate cement solidified high-salt leachate sludge.
- sludge with leachate /
- extremely high salinity content /
- cured stabilization /
- micro-control mechanism /
- water stability

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参考文献(22)

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