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.

[Research advances in control of N2O emission from municipal solid waste landfill sites].

Landfill is one of the main approaches for municipal solid waste treatment, and landfill site is a main emission source of greenhouse gases nitrous oxide (N2O) and methane (CH4). As a high-efficient trace greenhouse gas, N2O has a very high warming potential, with a warming capacity 296 times of CO2, and has a long-term stability in atmosphere, giving greater damage to the ozone layer. Aiming at the researches in the control of N2O emission from municipal solid waste landfill sites, this paper summarized the characteristics and related affecting factors of the N2O emission from the landfill sites, and put forward a series of the measures adaptable to the N2O emission control of present municipal solid waste landfill sites in China.

[Effect of injected leachate C/N ratio on the denitrification of a bioreactor filled with landfilled refuse].

The denitrification capacity of a landfill bioreactor was investigated under different ratios of injected leachate C/N; the denitrifying bacteria community compositions over four injection times were also studied using molecular approaches and functional gene nirS served as marker. Results showed that COD/NO3(-) -N ratio of the injected landfill leachate had a significant impact on the denitrification capacity of the bioreactor. Nitrate reduction rate increased from 1.

Characterization and control of odorous gases at a landfill site: a case study in Hangzhou, China.

Municipal solid waste (MSW) landfills are one of the major sources of offensive odors potentially creating annoyance in adjacent communities. At the end of May 2007, an odor pollution incident occurred at the Tianziling landfill site, Hangzhou, China, where the residents lodged complaints about the intense odor from the landfill, which drew a significant attention from the government. In this study, ambient air monitoring was conducted at the Tianziling landfill site.