Study on denitrification performance of modified polypropylene-based slow-release carbon source coupled with biofilm water purifier
Solid slow-release carbon sources have gradually become an effective method to improve the denitrification efficiency of low carbon-to-nitrogen ratio(C/N)wastewater.We prepared a novel hydrophilically modified porous polypropylene-based slow-release carbon source material(HEPP-C).Utilizing it as a biological filler,we constructed a biofilm water purifier to study the denitrification efficiency of low C/N wastewater.HEPP-C exhibited a more stable and prolonged carbon release performance.In the intermittent denitrification system,HEPP-C achieved the highest denitrification efficiency,with removal rates of NO-3-N and TN being 89.6%and 89.5%,respectively.In the continuous-flow slow-release carbon source coupled with the biofilm purification system,the HEPP-C carbon source enhanced the removal efficiency of NO-3-N and TN notably.When the influent NO-3-N concentration was below 20 mg/L,with a hydraulic retention time of 12 h and an aeration-non-aeration cycle of 8 h—4 h,the effluent TN concentration after treatment was 1.24 mg/L,which is below the surface water quality standard of Class Ⅵ.Thus,the established HEPP-C based slow-release carbon source coupled with a biofilm water purifier can effectively denitrify low-contaminated wastewater and river/lake waters.
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