To explore the effect of different size filler ratio on nitrogen and carbon removal in double sludge system.In two sequential batch bioreactors(SBR),15％polyurethane sponge filler was added to form two double sludge systems.The ex-perimental groups with large size(5 cm)and small size(1.66 cm)filler volume ratio of 1∶2 and 2∶1 were set up respec-tively to treat the actual domestic sewage.The results showed that the double sludge system with the ratio of large size and small size filler volume of 1∶2 had the best nitrogen and carbon removal effect.The average removal rate of COD,NH4+-N and TN and the utilization rate of denitrification carbon source were 86.9％,96.07％,70.74％and 26.67％,respectively.In addition,in the system with a large proportion of large-size fillers,the biofilm cannot be fully attached inside the fillers,so it is recommended to increase the proportion of small-size fillers in actual operation to efficiently complete biological ni-trogen removal.
packing sizenitrogen removal and carbon reductionsimultaneous nitrification and denitrificationoxy-gen penetration depth
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