Based on the principle of bacterial leaching and bacterial metallurgy,a novel technology for the detoxification of chromium-containing slag by Achromobacter sp.CH-1 and chromium recovery was proposed.Strain CH-1 cell ...Based on the principle of bacterial leaching and bacterial metallurgy,a novel technology for the detoxification of chromium-containing slag by Achromobacter sp.CH-1 and chromium recovery was proposed.Strain CH-1 cell morphology before and after Cr(Ⅵ) reduction was observed with a scanning electron microscope(SEM),and the reduction product is found to adhere to terminals of CH-1 cells.Energy-dispersive X-ray(EDX) and electron paramagnetic resonance(EPR) analyses reveal that the main component of the reduction product is Cr(Ⅲ).Furthermore,small and large-scale demonstration projects reveal that Achromobacter sp.can be used to detoxify chromium-containing slag and to selectively recover chromium by using this novel technique.Chromium recovery rate increases with decreasing particle sizes of chromium-containing slag and slagheap height.Chromium recovery rates in 10 t/batch and 20 t/batch of on-site demonstration projects for chromium-containing slag detoxification are more than 90%.展开更多
Removal characteristics of sulfamethazine （SMZ） by sludge and a bacterial strain using an aerobic sequence batch reactor （ASBR） were studied. Operating conditions were optimized by varying the reaction time and sl...Removal characteristics of sulfamethazine （SMZ） by sludge and a bacterial strain using an aerobic sequence batch reactor （ASBR） were studied. Operating conditions were optimized by varying the reaction time and sludge retention time （SRT）. AnAchromobacter sp. （S-3） with the ability to remove SMZ was isolated from the ASBR. The effects of different operating parameters （pH and temperature） on the biodegradation of SMZ by S-3 were determined. The results indicate that, between 0.5 and 4 hr, reaction time of the ASBR had a significant effect on the SMZ removal efficiency in the system. The SMZ removal efficiency also increased from 45% to 80% when SRT was prolonged from 5 to 25 days, although longer SRT had no impact on SMZ removal. The SMZ adsorption rate decreased with increasing temperature, which fitted Freundiich isotherm well. The removal of SMZ in the ASBR was due to the combined effects of adsorption and degradation, and degradation played a leading role.展开更多
文摘Based on the principle of bacterial leaching and bacterial metallurgy,a novel technology for the detoxification of chromium-containing slag by Achromobacter sp.CH-1 and chromium recovery was proposed.Strain CH-1 cell morphology before and after Cr(Ⅵ) reduction was observed with a scanning electron microscope(SEM),and the reduction product is found to adhere to terminals of CH-1 cells.Energy-dispersive X-ray(EDX) and electron paramagnetic resonance(EPR) analyses reveal that the main component of the reduction product is Cr(Ⅲ).Furthermore,small and large-scale demonstration projects reveal that Achromobacter sp.can be used to detoxify chromium-containing slag and to selectively recover chromium by using this novel technique.Chromium recovery rate increases with decreasing particle sizes of chromium-containing slag and slagheap height.Chromium recovery rates in 10 t/batch and 20 t/batch of on-site demonstration projects for chromium-containing slag detoxification are more than 90%.
基金supported by the National Natural Science Foundation of China(No.21007010)the Research Fund for the Doctoral Program of Higher Education of China(No.20090075120007)+4 种基金the Shanghai Committee of Science and Technology(No.09230500200)the Fundamental Research Funds for the Central Universities(No. 2011D11309)the Joint Funds of Chinese Transportation Ministry and Hunan Province for Science and Technology Development(No.2010-353-343-290)the Knowledge Innovation Program of the Chinese Academy of Sciences (No.KZCX2-YW-Q02-02,KZCX2-YW-BR-19)the Project of Transportation Department of Hunan Province (No.200908)
文摘Removal characteristics of sulfamethazine （SMZ） by sludge and a bacterial strain using an aerobic sequence batch reactor （ASBR） were studied. Operating conditions were optimized by varying the reaction time and sludge retention time （SRT）. AnAchromobacter sp. （S-3） with the ability to remove SMZ was isolated from the ASBR. The effects of different operating parameters （pH and temperature） on the biodegradation of SMZ by S-3 were determined. The results indicate that, between 0.5 and 4 hr, reaction time of the ASBR had a significant effect on the SMZ removal efficiency in the system. The SMZ removal efficiency also increased from 45% to 80% when SRT was prolonged from 5 to 25 days, although longer SRT had no impact on SMZ removal. The SMZ adsorption rate decreased with increasing temperature, which fitted Freundiich isotherm well. The removal of SMZ in the ASBR was due to the combined effects of adsorption and degradation, and degradation played a leading role.
