| Municipal sewage sludge is a kind of the solid, semisolid and liquid floccule sludge with high moisture, organic substances produced in the treatment of waste water. The dump and landfill of sewage sludge not only occupies much farmland, but also causes environmental pollution. Abundant experiments have been conducted on the pyrolysis of dried sewage sludge on the fixed pyrolyzing furnace, and deeply analyses have been given to the production distribution, the gas characteristics, the pyrolysis gas quality, the characteristics of the pyrolysis solution and residual carbon. The results show that the pyrolysis temperature is the top-drawer parameter which affects the pyrolysis of the sewage sludge. With temperature increasing, the gaseous yield increase, the yield of pyrolysis tar and char yield decreases accordingly. The main components of pyrolysis gas are carbon monoxide, hydrogen, methane and carbon dioxide. The content of CO, H2 increases in gaseous component with the pyrolysis temperature increasing. In the same time, advanced detections such as SEM,TG,BET,GC and IR are used to analysis and character the performance of sewage sludge pyrolysis products, mechanism of sewage sludge is also discussed. The mathematical model of sewage sludge pyrolysis forecast is constituted and the integrative evaluation of pyrolysis under different conditions is realized. All of the experiment results show that under appropriate operating conditions of pyrolysis, the high efficient pyrolysis could be attained. And pyrolysis technology is regarded as a viable option for the resources conversion and emission reduction of sewage sludge at municipal wastewater treatment plants.
|
PDF Full Text Request