Performance of packing media beds for treating polluted river water in winter

Key words: 
• winter operation /
• packing media /
• N/P removal /
• correlation analysis /
• Dianchi Lake /
• Daqing River

Abstract: Research on performance of packing media beds for treating polluted river water of Dianchi Watershed was conducted in winter. The result shows that according to the correlation analysis, the microbial activity in brickbased system(BS) is relatively low when the temperature is in the range of 2～6℃, but it will be promoted as the temperature gradually rises. At 2～12℃, waste concrete/zeolite/cinder-based system(CZCS), where its COD removal efficiency is about 50%, has a stable and high biomass level and the high level of oxygen uptake rate. During the temperature dropping period（5～12℃）, the BS shows the highest removal efficiency with the following average values: 64.5% TN,64.7% NH+4-N,69.7% DTP. During the low temperature period(2～6℃), the removal efficiency of NH+4-N and TN in CZCS is 56.4%～75.1%, 56.5%～63.0% respectively, while up to 2.1 g/(m2·d) of DTP is removed in gravel/detritus/cinder-based system(GDCS). BS is suitable for treating the low DTP load, whereas GDCS is more efficient for removing the high DTP load. In sum, waste concrete/zeolite/cinder group is suitable for treating the pollutants in rivers of Dianchi Lake watershed due to the comparatively stable characteristics of removal efficiency of COD、N and DTP in the entire experiments(2～12℃).