Jinxiang Fu

Simultaneous Biological Removal of Iron, Manganese and Ammonium Nitrogen in Simulated Groundwater Using Biological Aerated Filter

The simultaneous biological removal of iron, manganese and ammonia from simulated contaminated groundwater was studied by biological aerated filter using dual layer ceramsite as support material in the lab. The system was simultaneously inoculated with iron and manganese oxidizing bacteria, nitrifying bacteria and nitrification bacteria and a series of experiments was performed to investigate simultaneous removal performance of the filter. The influence of variation flow rate on simultaneous removal of manganese, iron and ammonia nitrogen was studied. At the mean time effluent concentration and removal ratio of manganese, iron and ammonia nitrogen along the filter depth were analysized. The results showed that the simultaneous removal of the aforementioned pollutants can be achieved by single-step filtration for high pollutants load (influent concentration 2.52~4.22mg/l, 1.22~3.97mg/l, 1.24~3.92 mg/l, respectively). Biofiltration ability to remove Mn for mixed bacteria on the filter can be improved by a sudden increase of flow rate(flow rate was 20l/h, 40l/h, 60l/h and 80l/h,respectively). But iron and ammonia removal were unaffected by a sudden increase of flow rate. Manganese was the rate-limiting pollutant.

Impact of DO Concentration on Shortcut Nitrification

The effect of the DO concentration on the stability of the shortcut nitrification was studied. The static test is done with SBR reactor. Reaction time reduced with the DO concentration raised appropriately, but DO in excess, the shortcut nitrification system will be damaged by the analysis of the impact of DO concentration on ammonia removal, nitrite nitrogen accumulation in shortcut nitrification process. When DO concentration was 0.45～0.9mg/L, the system was stable, and the reaction time was reduced quickly. When DO concentration was beyond 1.6mg/L, shortcut nitrification system would be transformed into complete nitrification.

Conventional Treatment of Nitrogen in Landfill Leachate

The purpose of this study is to remove TN of landfill leachate by the conventional treatment-A2O under the new Standard for Pollution Control on the Landfill Site of Municipal Solid Waste（GB16889-2008）. Explore the conventional process for denitrification of landfill leachate treatment, and the best craft and working conditions. Through long-term experiment to prove the conventional technology of denitrification of landfill leachate treatment is entirely feasible, when the nitrification liquid reflux ratio of 900%, plus the case of carbon removal may be achieved good results.