The drying mechanism is important to the drying technology of sewage sludge.Using dynamic electronic balance and image acquisition technique, the paper studies the change of surface configuration and characteristics o...The drying mechanism is important to the drying technology of sewage sludge.Using dynamic electronic balance and image acquisition technique, the paper studies the change of surface configuration and characteristics of moisture transference for three kinds of sewage sludge during drying.In the meantime,the paper also analyses the influence of sludge shape on moisture transference and the change of sludge apparent volume and porosity in the course of drying.展开更多
Characteristics of PCDD/Fs during the melting process of municipal solid waste incinerator fly ash were investigated by lab-scale experiments. Two kinds of fly ash samples,obtained from fixed-bed and fluidized-bed inc...Characteristics of PCDD/Fs during the melting process of municipal solid waste incinerator fly ash were investigated by lab-scale experiments. Two kinds of fly ash samples,obtained from fixed-bed and fluidized-bed incinerators respectively,were used. The experiments were performed at various temperatures,two kinds of atmosphere (O 2 and N 2) and different residence times,and the DRE(decomposition and removal efficiency) of PCDD/Fs contained in fly ash was studied. The result revealed that approximately 99.96% dioxins were decomposed by melting under experimental condition,and the concentration of dioxins in exhaust gas of melting furnace was below the detection limit. There was an increase in temperature from 1100 ℃ to 1460 ℃ resulting in an increase of DRE of dioxins in fly ash from 99.968% to 100% in an oxidative melting atmosphere. The DRE of dioxins in the oxidative atmosphere is higher than that in inert atmosphere. The results will be helpful not only to studying the mechanism of dioxin decomposition in the melting process but also to evaluating the effect of pollution control.展开更多
基金国家博士后科学基金项目 (No 2 0 0 2 2 3 ) 辽宁省自然科学基金项目 (No 0 110 10 14 )沈阳市科学技术计划项目(No SK0 10 5 )共同资助~~
文摘The drying mechanism is important to the drying technology of sewage sludge.Using dynamic electronic balance and image acquisition technique, the paper studies the change of surface configuration and characteristics of moisture transference for three kinds of sewage sludge during drying.In the meantime,the paper also analyses the influence of sludge shape on moisture transference and the change of sludge apparent volume and porosity in the course of drying.
基金国家博士后科学基金 (No 2 0 0 3 0 3 413 2 )国家高技术研究发展计划项目 (No 2 0 0 2AA64 40 10 )资助
文摘Characteristics of PCDD/Fs during the melting process of municipal solid waste incinerator fly ash were investigated by lab-scale experiments. Two kinds of fly ash samples,obtained from fixed-bed and fluidized-bed incinerators respectively,were used. The experiments were performed at various temperatures,two kinds of atmosphere (O 2 and N 2) and different residence times,and the DRE(decomposition and removal efficiency) of PCDD/Fs contained in fly ash was studied. The result revealed that approximately 99.96% dioxins were decomposed by melting under experimental condition,and the concentration of dioxins in exhaust gas of melting furnace was below the detection limit. There was an increase in temperature from 1100 ℃ to 1460 ℃ resulting in an increase of DRE of dioxins in fly ash from 99.968% to 100% in an oxidative melting atmosphere. The DRE of dioxins in the oxidative atmosphere is higher than that in inert atmosphere. The results will be helpful not only to studying the mechanism of dioxin decomposition in the melting process but also to evaluating the effect of pollution control.
