Abstract
Moisture content is an important factor affecting the geotechnical properties of solidified municipal sludge (MMS). Typical municipal sludge in China was chosen to investigate the effects of initial moisture content (defined as w0) on geotechnical properties of MMS solidified by self-developed CERSM solidifying agent. In addition, the microstructure changes of solidified sludge samples in this study were explored with scanning electron microscopy and mercury intrusion porosimetry. Mechanical experiment results showed that the unconfined compressive strength, cohesion, and internal friction angle of the MMS increased with the decrease in initial moisture content, but the permeability coefficient changed oppositely. The permeability coefficient of solidified sludge samples was between 10−8 and 10−10 cm/s. But after the drying-saturated process, the permeability coefficient of MMS can be increased up to 4 times, mainly due to the formation of a considerable number of microconnected pores and microcracks in the process of drying. The research results are of great significance to the safe disposal and utilization of municipal sewage sludge in China.
Highlights
E research results are of great signi cance to the safe disposal and utilization of municipal sewage sludge in China
Sludge samples decreased with the reduction of initial moisture content. e derived values, which were less than 10−7 cm/s and all between the magnitude of 10−8 and 10−10 cm/s, can meet the requirements of permeability coe cient and China’s standards for managing the impermeable layers of land lls
The emphasis of the application is solving the geotechnical properties of solidi ed municipal sewage sludge from di erent sources and determining the e ect of moisture
Summary
E research results are of great signi cance to the safe disposal and utilization of municipal sewage sludge in China. Yang et al [10] used coal gangue, cement, clay, and ber to solidify municipal sewage sludge, and they found that the solidi ed sludge can be used as land ll cover materials with high strength, strong crack resistance, and low permeability coe cient characteristics. E studies mostly focused on sludge with high moisture content [12, 13], only few research has been conducted on the in uencing mechanism of di erent initial moisture contents on the geotechnical properties of the solidi ed sludge. Boutouil and Levacher [12] studied the in uence of initial water content on the mechanical behaviour of solidi ed dredged sludge, and found that there was a good linear relationship between compressive strength and the inverse of water/cement ratio. Horpibulsuk et al [21] researched the compression behavior of solidi ed so soil with di erent initial water content, Advances in Polymer Technology
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