In 2008,around 596 000 t of aluminum dross was generated from secondary aluminum industry in China;however,it was not sufficiently recycled yet.Approximately 95% of the Al dross was land filled without innocent treatm...In 2008,around 596 000 t of aluminum dross was generated from secondary aluminum industry in China;however,it was not sufficiently recycled yet.Approximately 95% of the Al dross was land filled without innocent treatment.The purpose of this work is to investigate Al dross recycling by environmentally efficient and friendly methods.Two methods of Al dross recycling which could utilize Al dross efficiently were presented.High-quality aluminum-silicon alloys and brown fused alumina(BFA) were produced successfully by recycling Al dross.Then,life cycle assessment(LCA) was performed to evaluate environmental impact of two methods of Al dross recycling process.The results show that the two methods are reasonable and the average recovery rate of Al dross is up to 98%.As the LCA results indicate,they have some advantages such as less natural resource consumption and pollutant emissions,which efficiently relieves the burden on the environment in electrolytic aluminum and secondary aluminum industry.展开更多
The results of a net energy life cycle analysis and greenhouse gas analysis for a 1.45 MW （0.71 MW electrical） biogas power plant operating with a 70% corn silage and 30% cow dung feedstock mixture are presented aft...The results of a net energy life cycle analysis and greenhouse gas analysis for a 1.45 MW （0.71 MW electrical） biogas power plant operating with a 70% corn silage and 30% cow dung feedstock mixture are presented after its initial five years of operation. A ratio of 8.0 for the total output electrical energy divided by the total input energy from fossil fuels is found. A net efficiency of 1.2% of converting solar energy into electricity and usable heat （0.6% electricity） is achieved. Only 16 g CO2 per kWh are generated in the process. If all greenhouse gases are considered, this process even actively reduces the total greenhouse gas load on the atmosphere. In terms of producing transportation biofuels, this process provides 3.8 times more yield per hectare than bioethanol generation.展开更多
A two-year field study was conducted to test the effects of two phosphate-solubilizing bacteria(PSB), Pantoea cypripedii(PSB-3)and Pseudomonas plecoglossicida(PSB-5), inoculated singly or together with rock phosphate(...A two-year field study was conducted to test the effects of two phosphate-solubilizing bacteria(PSB), Pantoea cypripedii(PSB-3)and Pseudomonas plecoglossicida(PSB-5), inoculated singly or together with rock phosphate(RP) fertilization on maize and wheat cropping cycle by comparing with chemical P fertilizer(diammonium phosphate, DAP), mainly in the crop yield, soil fertility and economic returns. Inoculation of PSB together with RP fertilization increased the crop growth in terms of shoot height, shoot and root dry biomass, grain yield and total P uptake in both maize and wheat crops compared to the other treatments. Soil fertility in the context of available P, enzyme activities and PSB population in both maize and wheat crops was significantly improved with PSB inoculation together with RP fertilization compared to DAP treatment. The combined use of PSB inoculation and RP fertilization was more economical due to minimal cost and maximum returns. These results suggested that PSB inoculation along with RP fertilization would be an appropriate substitute for chemical phosphate fertilizer application in sustainable agriculture systems.展开更多
基金Project(07dz12028) supported by the Science Program of Science and Technology Commission of Shanghai Municipality,China
文摘In 2008,around 596 000 t of aluminum dross was generated from secondary aluminum industry in China;however,it was not sufficiently recycled yet.Approximately 95% of the Al dross was land filled without innocent treatment.The purpose of this work is to investigate Al dross recycling by environmentally efficient and friendly methods.Two methods of Al dross recycling which could utilize Al dross efficiently were presented.High-quality aluminum-silicon alloys and brown fused alumina(BFA) were produced successfully by recycling Al dross.Then,life cycle assessment(LCA) was performed to evaluate environmental impact of two methods of Al dross recycling process.The results show that the two methods are reasonable and the average recovery rate of Al dross is up to 98%.As the LCA results indicate,they have some advantages such as less natural resource consumption and pollutant emissions,which efficiently relieves the burden on the environment in electrolytic aluminum and secondary aluminum industry.
文摘The results of a net energy life cycle analysis and greenhouse gas analysis for a 1.45 MW （0.71 MW electrical） biogas power plant operating with a 70% corn silage and 30% cow dung feedstock mixture are presented after its initial five years of operation. A ratio of 8.0 for the total output electrical energy divided by the total input energy from fossil fuels is found. A net efficiency of 1.2% of converting solar energy into electricity and usable heat （0.6% electricity） is achieved. Only 16 g CO2 per kWh are generated in the process. If all greenhouse gases are considered, this process even actively reduces the total greenhouse gas load on the atmosphere. In terms of producing transportation biofuels, this process provides 3.8 times more yield per hectare than bioethanol generation.
基金supported by the University Grant Commission (UGC) of India (No. 34-67/2008 SR)
文摘A two-year field study was conducted to test the effects of two phosphate-solubilizing bacteria(PSB), Pantoea cypripedii(PSB-3)and Pseudomonas plecoglossicida(PSB-5), inoculated singly or together with rock phosphate(RP) fertilization on maize and wheat cropping cycle by comparing with chemical P fertilizer(diammonium phosphate, DAP), mainly in the crop yield, soil fertility and economic returns. Inoculation of PSB together with RP fertilization increased the crop growth in terms of shoot height, shoot and root dry biomass, grain yield and total P uptake in both maize and wheat crops compared to the other treatments. Soil fertility in the context of available P, enzyme activities and PSB population in both maize and wheat crops was significantly improved with PSB inoculation together with RP fertilization compared to DAP treatment. The combined use of PSB inoculation and RP fertilization was more economical due to minimal cost and maximum returns. These results suggested that PSB inoculation along with RP fertilization would be an appropriate substitute for chemical phosphate fertilizer application in sustainable agriculture systems.
