Advanced nitrogen removal of sulfur-driven autotrophic denitrification from landfill leachate after partial nitrification and denitrification pretreatment.

Sulfur-driven autotrophic denitrification (SdAD) was employed to remove residual nitrogen from the biological effluent of landfill leachate after partial nitrification and denitrification pretreatment. The performance of SdAD were assessed with various NO-N (NO-N and NO-N) loadings over a 185-day operational period. The results demonstrated that a notable NO-N removal efficiency of 97.

Effects of community structure of sprouting forests with different densities on ecosystem carbon density at the early stage of succession.

To explore potential responses of ecosystem carbon density to changes of community structure during natural regeneration of woody plants, we analyzed the relationships between ecosystem carbon density and its components, tree species diversity, structural diversity (CV) and spatial structure parameters (mingling, aggregation, dominance, crowding) of forests with different sprouting densities (1154, 847 and 465 individuals·hm) at the early stage of succession in Baishanzu National Park. The results showed that tree species diversity (species richness index and Shannon diversity index) increased with the decrease of sprouting density of . Among the stand structural parameters, CV, stand density, and mingling increased with the decrease of sprouting density of .