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.

Based on the previous studies, this experiment presented a new kind of microbial fuel cells (MFC), single-chamber air cathode microbial fuel cells without proton membrane. After investigating the contrast of substrate changes in microbial fuel cells and simple anaerobic digestion, the analysis results of soluble chemical oxygen demand (SCOD), TP, TN and NH3-N show that: SCOD increase firstly, then decrease, to the end, descend. As a result, we find that SCOD in MFC is lower than that in control device (CD). Throughout the whole reaction period, TP in MFC is lower than that in CD. TN and NH3-N show upward trend after a reaction period.

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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.

A series of experiments were carried out aiming at resource utilization of fresh green waste and sewage sludge. The green waste, rice straw and sewage sludge were chosen as raw materials and packing materials in composting experiments to study the variation characteristics of composting in different aeration patterns. It was found that the effect of intermittent aeration pattern during composting was better than continuous aeration pattern according to the results of detection of composting temperature, oxygen, carbon dioxide.