Abstract
Nitrogen and phosphorus removal is necessary to avoid eutrophication of water bodies when treated wastewater is outlet to slowly flowing water bodies or recycled as technological water. The “BioBalance” technology as the latest way of nitrogen and phosphorus removal was applied at Utena Wastewater Treatment Plant. Composition of wastewater has an impact on biological phosphorus removal, particularly the ratio of biochemical oxygen demand and total phosphorus (BOD7/Total-P) in wastewater after mechanical treatment. Nitrates in the anaerobic zone can have a negative effect on biological phosphorus removal. Consequently, it is necessary to evaluate the impact of the mentioned factors on biological nitrogen and phosphorus removal. Biological nitrogen and phosphorus removal was evaluated and compared by using the “BioBalance” technology for biological nitrogen and phosphorus removal and technology before reconstruction during this investigation. The correlation regressive analysis of the biochemical oxygen demand and total phosphorus (BOD7/Total‐P) after mechanical treatment and the total phosphorus concentration in the effluent was evaluated. The correlation regressive analysis of nitrates in an anaerobic zone on the aeration tank and the efficiency of phosphorus removal was also evaluated.
Highlights
Utena Wastewater Treatment Plant was renovated in 1999
The most advanced BioBalance technology was applied at Utena Wastewater Treatment Plant where nitrogen is removed in a nitrification/denitrification tank, and the anaerobic zone is equipped before the nitrification/denitrification tank of the biological phosphorus removal
Composition of wastewater has an impact on biological phosphorus removal, the ratio of biochemical oxygen demand and total phosphorus (BOD7/Total-P) in wastewater after mechanical treatment [13]
Summary
Utena Wastewater Treatment Plant was renovated in 1999. The most advanced BioBalance technology was applied at Utena Wastewater Treatment Plant where nitrogen is removed in a nitrification/denitrification tank, and the anaerobic zone is equipped before the nitrification/denitrification tank of the biological phosphorus removal. Composition of wastewater has an impact on biological phosphorus removal, the ratio of biochemical oxygen demand and total phosphorus (BOD7/Total-P) in wastewater after mechanical treatment [13]. Nitrates in the anaerobic zone can have a negative effect on biological phosphorus removal. Volatile fatty acids are used for denitrification of nitrates. Volatile fatty acids could be assimilated by the acinetobacter [46]
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