Enhanced denitrification effect of biological rope by composite solid-phase carbon source materials
There are few organic carbon sources in micro-polluted water with excessive total nitrogen.Adding an external carbon source can promote denitrification to remove ni-trogen.Solid carbon sources have attracted attention because they overcome the shortcom-ings of the traditional carbon source.In this study,two solid carbon sources,PSPC-Ⅰ and PSPC-Ⅱ,were prepared by cross-linking,using agricultural waste corncob and polymer materials as carbon sources and polyvinyl alcohol and sodium alginate as skeleton carriers.The carbon release characteristics of the two solid carbon sources and their enhanced deni-trification effect were studied.The results showed that the two solid carbon sources released carbon continuously and did not reach carbon release equilibrium within 28 days.The max-imum carbon release values of PSPC-Ⅰ and PSPC-Ⅱ were 6.3 and 8.7 mg/g(calculated via the dissolved organic carbon(DOC)),respectively.Three-dimensional fluorescence results showed that the released carbon sources were mainly soluble microbial metabolites and aromatic proteins that were easily degraded by microorganisms.In comparison with the biological rope without an added carbon source(≤ 200 ng/g,calculated via the adenosine triphosphate(ATP)),both solid carbon sources significantly increased the biomass of bi-ological rope biofilm(PSPC-Ⅰ:400～600 ng/g,PSPC-Ⅱ:300～500 ng/g).Additionally,both solid carbon sources significantly enhanced denitrification.The control group did not produce denitrification,but the denitrification rates of the two solid carbon sources were as high as 80.4％and 75.0％,respectively.
solid carbon sourcecorncobbiological denitrificationdenitrificationbio-logical medium
万方数据
维普
