一种基于持水曲线的市政污泥水分分布测试方法研究  

Moisture distribution in sewage sludge based on soil-water characteristic curve

作　　者：占鑫杰[1,2] 詹良通 林伟岸[3,4] 陈云敏[3,4] ZHAN Xin-jie;ZHAN Liang-tong;LIN Wei-an;CHEN Yun-min(Nanjing Hydraulic Research Institute,Nanjing 210029,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing 210029,China;MOE Key Laboratory of Soft Soils and Geo-environmental Engineering,Zhejiang University,Hangzhou 310058,China;Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024 [2]水文水资源与水利工程国家重点试验室,江苏南京210029 [3]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [4]浙江大学岩土工程研究所,浙江杭州310058

出　　处：《岩土工程学报》2021年第11期2112-2118,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学青年基金项目(Gk321002);南京水利科学研究院中央级公益性科研院所基本科研业务费重点项目(Y320012)。

摘　　要：市政污泥的脱水特性与其水分分布特性密切相关,对市政污泥的水分分布特性开展研究具有重要的理论意义。目前测试污泥水分分布曲线采用热重-差热分析方法,该方法中试样量仅有50 mg,测试结果复现性较差。拟提出一种基于持水曲线的市政污泥水分分布测试方法,并构建了新测试方法的理论框架。随后采用渗析法联合相对湿度法测试了市政污泥的水分分布曲线,并与传统的热重差热试验结果进行对比分析。研究结果表明,基于持水曲线的污泥水分分布测试方法具有如下特点:试验量多;测试过程中试样结构状态变化小;测试的结合能范围更广泛。The dewatering characteristic of sewage sludge is closely related to its moisture distribution.The researches on the moisture distribution characteristics in the sewage sludge are of important theoretical significance.Currently the measurement of moisture distribution curve of the sewage sludge mainly adopts the thermal gravimetry-differential thermal method,in which the amount of samples is only 50 mg,and the reproducibility of the tests is poor.A new method for measuring the moisture distribution in the sewage sludge based on the soil-water characteristic curve is proposed.Firstly based on the relationship between water potential and bond strength of moisture in the sewage sludge,the formula for bond strength of moisture and matric suction of the sewage sludge is derived.Accordingly the moisture distribution curve of the sewage sludge can be obtained by measuring its soil-water characteristic curve.The osmotic method and the relative humidity method are employed to obtain the moisture distribution curve of the sewage sludge.The results are compared with those based on the combined thermal gravimetry-differential thermal method.The proposed method for the moisture distribution in sewage sludge based on the soil-water characteristic curve has following features:the amount of samples is enough and representative,the change of structure of samples is small during measurement process,and the range of bond strength of measured moisture is wider.

关 键 词：市政污泥 水分分布特性 水分结合能 土水势 持水曲线 热重差热分析 

分 类 号：TU43[建筑科学—岩土工程]