Study on the COD Removal Efficiency of Self-aeration Artificial Wetlands

Aimed at the issue of dissolved oxygen(DO) concentration insufficiency in conventional artificial wetlands, shale hollow bricks were adopted to build self-aeration artificial wetland system, for studying its removal efficiency of waste water COD. The experimental results indicated that DO concentration in self-aeration artificial wetland system is about 0.1 mg / L higher than artificial enhanced aeration wetland system, and COD removal rate of self-aeration artificial wetland system is more than 85%, about 2% higher than artificial enhanced aeration wetland system. It presented that the self-aeration wetland system can increase its internal oxygen supply capacity and the purification efficiency of wetland system to waste water COD.