The Experts below are selected from a list of 200544 Experts worldwide ranked by ideXlab platform
Jian-kai Jiang - One of the best experts on this subject based on the ideXlab platform.
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Response of extracellular polymeric substances to Thermal Treatment in sludge dewatering process
Environmental Pollution, 2017Co-Authors: Long Fei Wang, Chen Qian, Jian-kai JiangAbstract:Abstract Sludge dewatering is an important process in municipal wastewater Treatment and critically influences the subsequent transportation and disposal. Thermal Treatment coupled with other chemical processes has been widely used to improve sludge dewaterability. However, information about the response of sludge extracellular polymeric substances (EPS) to Thermal Treatment and its role in sludge dewatering is still limited. In this work, the effects of Thermal Treatment on anaerobic and aerobic sludges were investigated with an emphasis on the colloid properties of released EPS in sludge dewatering process. The results indicate that sludge dewaterability became deteriorated with the increased temperature in the range of 30–170 °C, which was ascribed to the disintegration of sludge flocs and change of EPS characteristics. Disintegrated sludge induced the release of the negatively charged EPS, resulting in the weakened bridging interaction and lower compactness. After Thermal Treatment, the EPS with a higher average molecular weight and stretched coil configuration retained more water. In addition, difference in dewaterability between anaerobic and aerobic sludges was found to be attributed to their different contents and structures of EPS components. These results provide an insight into Thermal-dependent sludge dewatering process and are useful to facilitate water-sludge separation.
Long Fei Wang - One of the best experts on this subject based on the ideXlab platform.
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Response of extracellular polymeric substances to Thermal Treatment in sludge dewatering process
Environmental Pollution, 2017Co-Authors: Long Fei Wang, Chen Qian, Jian-kai JiangAbstract:Abstract Sludge dewatering is an important process in municipal wastewater Treatment and critically influences the subsequent transportation and disposal. Thermal Treatment coupled with other chemical processes has been widely used to improve sludge dewaterability. However, information about the response of sludge extracellular polymeric substances (EPS) to Thermal Treatment and its role in sludge dewatering is still limited. In this work, the effects of Thermal Treatment on anaerobic and aerobic sludges were investigated with an emphasis on the colloid properties of released EPS in sludge dewatering process. The results indicate that sludge dewaterability became deteriorated with the increased temperature in the range of 30–170 °C, which was ascribed to the disintegration of sludge flocs and change of EPS characteristics. Disintegrated sludge induced the release of the negatively charged EPS, resulting in the weakened bridging interaction and lower compactness. After Thermal Treatment, the EPS with a higher average molecular weight and stretched coil configuration retained more water. In addition, difference in dewaterability between anaerobic and aerobic sludges was found to be attributed to their different contents and structures of EPS components. These results provide an insight into Thermal-dependent sludge dewatering process and are useful to facilitate water-sludge separation.
Heimo Ylänen - One of the best experts on this subject based on the ideXlab platform.
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Effect of Thermal Treatment on physical properties of bioactive glass
Materials Chemistry and Physics, 2006Co-Authors: A. Nishara Begum, Venkatachalam Rajendran, Heimo YlänenAbstract:Abstract The bioactive glass of composition 53SiO 2 –6Na 2 O–22CaO–11K 2 O–5MgO–2P 2 O 5 –1B 2 O 3 (1–98) has been prepared using the melt method. The ultrasonic velocities, attenuation and elastic properties measurements have been made operated at a fundamental frequency of 5 MHz at room temperature on bioactive glass 1–98 before and after different Thermal Treatment conditions. Further, the frequency dependence of the attenuation was fitted into a linear relation α = af N . The observed linear increase in velocities, density and elastic properties of bioactive glass as a function of Thermal Treatment temperature, indicates that the densification in bioactive glass is due to the change in network bond per unit volume and not due to the structural/cross-linkage changes. Thus, Thermal Treatments of bioactive glasses lead to changes in elastic properties of bioactive glass. Furthermore, a long-term Thermal Treatment at higher temperatures also seemed to cause such changes to the glass surface that the formation of Ca,P-layer was inhibited during a 48 h immersion in simulated body fluid (SBF).
Chen Qian - One of the best experts on this subject based on the ideXlab platform.
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Response of extracellular polymeric substances to Thermal Treatment in sludge dewatering process
Environmental Pollution, 2017Co-Authors: Long Fei Wang, Chen Qian, Jian-kai JiangAbstract:Abstract Sludge dewatering is an important process in municipal wastewater Treatment and critically influences the subsequent transportation and disposal. Thermal Treatment coupled with other chemical processes has been widely used to improve sludge dewaterability. However, information about the response of sludge extracellular polymeric substances (EPS) to Thermal Treatment and its role in sludge dewatering is still limited. In this work, the effects of Thermal Treatment on anaerobic and aerobic sludges were investigated with an emphasis on the colloid properties of released EPS in sludge dewatering process. The results indicate that sludge dewaterability became deteriorated with the increased temperature in the range of 30–170 °C, which was ascribed to the disintegration of sludge flocs and change of EPS characteristics. Disintegrated sludge induced the release of the negatively charged EPS, resulting in the weakened bridging interaction and lower compactness. After Thermal Treatment, the EPS with a higher average molecular weight and stretched coil configuration retained more water. In addition, difference in dewaterability between anaerobic and aerobic sludges was found to be attributed to their different contents and structures of EPS components. These results provide an insight into Thermal-dependent sludge dewatering process and are useful to facilitate water-sludge separation.
A. Nishara Begum - One of the best experts on this subject based on the ideXlab platform.
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Effect of Thermal Treatment on physical properties of bioactive glass
Materials Chemistry and Physics, 2006Co-Authors: A. Nishara Begum, Venkatachalam Rajendran, Heimo YlänenAbstract:Abstract The bioactive glass of composition 53SiO 2 –6Na 2 O–22CaO–11K 2 O–5MgO–2P 2 O 5 –1B 2 O 3 (1–98) has been prepared using the melt method. The ultrasonic velocities, attenuation and elastic properties measurements have been made operated at a fundamental frequency of 5 MHz at room temperature on bioactive glass 1–98 before and after different Thermal Treatment conditions. Further, the frequency dependence of the attenuation was fitted into a linear relation α = af N . The observed linear increase in velocities, density and elastic properties of bioactive glass as a function of Thermal Treatment temperature, indicates that the densification in bioactive glass is due to the change in network bond per unit volume and not due to the structural/cross-linkage changes. Thus, Thermal Treatments of bioactive glasses lead to changes in elastic properties of bioactive glass. Furthermore, a long-term Thermal Treatment at higher temperatures also seemed to cause such changes to the glass surface that the formation of Ca,P-layer was inhibited during a 48 h immersion in simulated body fluid (SBF).
