Comparative analysis of sludge dewatering technology from research progress and carbon emission
In this study,the principles and characteristics of several conventional sludge dewatering technologies(sludge thickening,mechanical dewatering and deep dewatering),and several emerging deep dewatering technologies with low-energy(low-temperature drying,biological drying and supercritical CO2 dewatering),were reviewed.Meanwhile,the carbon emissions of different technologies were analyzed in comparison.The results showed that the conventional dewatering technology exhibited the advantages of relative maturity and wide application,but there were problems,such as high energy consumption,high chemicals consumption and high carbon emission,that is,"three high"problem.Among above technologies,the carbon emission from thermal drying technology was the most significant(2070.21kg CO2/t DS),and more than 75％of carbon emissions were attributed to the use of chemicals in mechanical dewatering and pretreatment dewatering processes.Superior carbon reduction potential was showed in the emerging technologies,which were 32.67(solar drying),1074.36(heat pump drying),58.78(biological drying)and 490.16(supercritical CO2 dewatering)kg CO2/t DS,respectively.They will be promising alternatives for conventional sludge dewatering technologies through optimization of process parameters and reduction of operating costs.The results of this study can provide important reference and foundation for the development and selection of low-carbon sludge dewatering technology.
万方数据
维普
