排序方式: 共有4条查询结果,搜索用时 31 毫秒
1
1.
A novel scheme for denitrifying biological phosphorus removal via nitrite from nutrient‐rich anaerobic effluents in a short‐cut sequencing batch reactor 下载免费PDF全文
2.
3.
4.
Regeneration of natural zeolite polluted by lead and zinc in wastewater treatment systems 总被引:1,自引:0,他引:1
Katsou E Malamis S Tzanoudaki M Haralambous KJ Loizidou M 《Journal of hazardous materials》2011,189(3):773-786
The aim of this work was to investigate the potential regeneration of natural zeolite which had been contaminated with lead and zinc contained in aqueous solutions, treated secondary effluent and primary treated wastewater. Several desorbing solutions were examined for the removal of Pb(II) and Zn(II) from zeolite and the highest desorption efficiency was obtained for 3M KCl and 1M KCl, respectively. The desorption process depended on the type and concentration of the desorbing solution, the metal being desorbed, the mineral selectivity towards the metal and the composition of the liquid medium where the adsorption process had taken place. Successive regeneration cycles resulted in the reduction of desorption efficiency by more than 50% after 9 and 4 cycles for lead and zinc, respectively. Kinetics examination showed that desorption was slower than adsorption, while metal ions which had been easily adsorbed were difficult to be desorbed. Adsorption was characterized by a three-stage diffusion process, while desorption followed a two-stage diffusion process. 相似文献
1