The leather wastewater contains a high level of nitrogen,which requires the addition of carbon sources for denitrification to ensure effective nitrogen removal.Pilot experiments were conducted using composite carbon sources,sodium acetate,and glucose.The results indicated that sodium acetate exhibited the highest denitrification efficiency,but a temporary nitrite accumulation was observed within the first 2 hours of the reaction.The composite carbon source ranked second in terms of efficiency,with no nitrite accumulation observed.In contrast,glucose had the lowest efficiency,with significant nitrite accumulation,which negatively impacted the COD level in the effluent.The composite carbon source,which boasts a high COD equivalent and contains multiple nutritional components,biological promoters,and trace elements,is the most suitable carbon source for nitrogen removal in leather wastewater.The optimal C/N ratio for addition was found to be between 5.0 and 6.0.This was successfully applied in a leather wastewater treatment plant,improving the effluent quality while reducing the amount of carbon source required,resulting in significant technical and economic benefits.
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