Leachate biochemical effluent containing large quantities of refractory matters are difficult to degrade by traditional biological processes. Photocatalysis technology seems to be a promising solution for leachate biochemical effluent because it can oxidize refractory organic compounds to harmless inorganics. But there are two key problems in TiO2photocatalytic degradation of biologically treated leachate. One is low quantum yield, the other is low photocatalytic activity in the visible-light region. The advice about solar photocatalytic degradation of biologically treated leachate using transition metal-nonmetal co-doped TiO2is put forward.

Biological nitrogen removal via shortcut nitrification-denitrification is being studied by more and more engineers because of its economical advantages. This paper summarizes the progress of shortcut nitrification-denitrification on high NH4+-N and low carbon source wastewater and low NH4+-N and high carbon source wastewater, and raises the thought that realize shortcut nitrification-denitrification.

Higher nitrogen and phosphorus in the water cause water eutrophication. Nitrogen and phosphorus removal are the primary methods of solving water eutrophication. This paper analyzed the development and key technology from Triple oxidation ditch, UNITANK process to MSBR process for the object of nitrogen and phosphorus removal.