Industrial Wastewater as a Source of External Organic Carbon for the Biological Nutrient Removal

• DOI: 10.17344/acsi.2022.7527
• Publication Date: 2022-09-18T11:24:41Z
• Authors: Bibiána Kožárová; Ronald Zakhar; Zuzana Imreová; Hana Hanuljaková; Ines Karlovská; Miloslav Drtil
• Keywords: biodegradability of industrial wastewater; Sewage; rate and efficiency of denitrification; Nutrients; Wastewater; Waste Disposal, Fluid; 01 natural sciences; Carbon; 6. Clean water; 0104 chemical sciences; 12. Responsible consumption; Chemistry; Bioreactors; semicontinuous bioreactors; heavy metals in sludge; biological wastewater treatment with nitrogen removal; 11. Sustainability; QD1-999

Addition of external organic carbon source for denitrification is generally used in wastewater treatment plants (WWTPs) to intensify nitrogen removal processes. The aim of the laboratory survey was to measure the composition of concentrated industrial wastewater, determine the possibilities of its use as an external denitrification substrate, and assess its overall impact on WWTP. The obtained results demonstrate that the analysed industrial wastewater is biodegradable, and can be used as a denitrification substrate without special adaptation of biomass. The denitrification rates with tested wastewater were in the range of 1.6 to 1.9 mgN/g·h. Negative influence of long-term dosing of industrial wastewater on activated sludge were not confirmed. The effect of imported wastewater on WWTP must be assessed comprehensively, including the impact of heavy metals from wastewater on the sludge quality. The instructions on how to calculate this balance are provided in the article.