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- Title
Effect of Pretreatment on Carbon Release Performance of Corncobs as a Solid Carbon Source.
- Authors
Tang, Jing; Lin, Zhihong; Li, Weitan; Meng, Ziqi; Yang, Jiahao
- Abstract
Wastewater with low carbon-to-nitrogen (C/N) ratio is a challenging problem for denitrification. Agricultural wastes as carbon sources to enhance low C/N wastewater have attracted much attention due to the high carbon release characteristics. In order to study the effect of pretreatment on carbon release performance of corncobs, the physical and chemical properties, carbon release performance and denitrification potential (DP) of corncobs after pretreatment were investigated, and the denitrification performance of alkali pretreated corncobs was tested in MBBR. The SEM showed the corncob's smooth surface was destroyed, causing cellulose and hemicellulose to be exposed for microorganisms. Acid treatment reduced the hemicellulose content by 15.2%, alkali treatment increased the cellulose content by 18.58%, and reduced lignin by 9.55%. Infrared spectroscopy explained that the reason of the increase of cellulose content in corncobs was that alkali pretreatment destroyed the hydrogen and ester bonds between cellulose and lignin. Corncob's carbon release capacity significantly improved after pretreatment. The cumulative COD release of corncobs with acid and alkali pretreatment increased by 30.93% and 46.41%, respectively. Alkali pretreated corncobs were added to the MBBR, the removal rates of TN, NH4+-N, and NO3−-N were stable at 92%, 96%, and 89%, respectively after 11 days of start-up period. These results indicated that the alkali pretreated corncobs enhanced nitrogen removal performance effectively for low C/N ratio wastewater.
- Subjects
CORNCOBS; LIGNINS; AGRICULTURAL wastes; CHEMICAL properties; INFRARED spectroscopy; CARBON
- Publication
Water, Air & Soil Pollution, 2023, Vol 234, Issue 9, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-023-06564-6