Moisture distribution in sludges based on di erent testing methods |
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| Authors: | Wenyi Deng Xiaodong Li Jianhua Yan Fei Wang Yong Chi and Kefa Cen |
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| Institution: | 1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. E-mail: dengwy@dhu.edu.cn,2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China,2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China,2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China,2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China and 2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Moisture distributions in municipal sewage sludge, printing and dyeing sludge and paper mill sludge were experimentally studied
based on four di erent methods, i.e., drying test, thermogravimetric-di erential thermal analysis (TG-DTA) test, thermogravimetricdi
erential scanning calorimetry (TG-DSC) test and water activity test. The results indicated that the moistures in the mechanically
dewatered sludges were interstitial water, surface water and bound water. The interstitial water accounted for more than 50% wet basis
(wb) of the total moisture content. The bond strength of sludge moisture increased with decreasing moisture content, especially when
the moisture content was lower than 50% wb. Furthermore, the comparison among the four di erent testing methods was presented.
The drying test was advantaged by its ability to quantify free water, interstitial water, surface water and bound water; while TG-DSC
test, TG-DTA test and water activity test were capable of determining the bond strength of moisture in sludge. It was found that the
results from TG-DSC and TG-DTA test are more persuasive than water activity test. |
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| Keywords: | moisture distribution sludge bond strength |
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