Thermal treatment of sewage sludge: Kinetic similarity of sludge rheology and organic matter solubilization
This work investigates the effect of thermal treatment on rheological properties and composition of sewage sludge with solids concentration of 2-15% in the range of 20-145 ℃ up to one hour.The results showed that by increasing the temperature of thermal treatment,the sludge becomes more fluid;however,the yield stress and apparent viscosity of sludge did not return to their original values after cooling the heated sludge.By measuring solubilized COD,it was proved that the underlying reason for rheological observation is a change in sludge composition.The irreversible change in the rheological characteristics of sludge is due to dissolution of solid.In fact,there is a direct relationship between change of sludge composition (measured with releasing soluble COD) and its rheological properties.It was proved that rheology can be used as a tool to monitor changes in sCOD due to thermal treatment.A theoretical cost and benefit analysis of sludge treatment plant which includes a thermal pre-treatment at 80℃ for a half an hour for 3.5% waste activated sludge,was shown a possibility of creating a net positive energy treatment plant due to saving in pumping and mixing cost in addition of an increase in biogas generation.
Apparent viscosity Sewage Sludge Yield stress COD
N.Eshtiaghi E.Farno K.Hii
Chemical and Environmental Eng., School of Engineering, RMIT University, Victoria 3001, Australia
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
117-120
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）