Abstract
A Florida wastewater treatment facility studied how Simultaneous Nitrification Denitrification (SND) coupled with traditional nitrogen removal would be used to meet the state’s current advanced wastewater treatment nutrient criterion. This study examined the effect of these combined processes on the fate and transport of the nitrogen species during the treatment process. The effectiveness of nitrogen removal within the full scale sequential batch reactor system (SBR) and the extent of SND compared to nitrification and denitrification in the nitrogen removal process was also evaluated. Finally, the overall performance of the municipal wastewater treatment facility utilizing these combined processes was evaluated. Overall, this application reduced the total nitrogen to almost 6% of the permitted concentration of 3.0 mg/L. The combination of both processes also resulted in an actual concentration 93.7% lower than the acceptable theoretical concentration, which also resulted in effluent Total Inorganic Nitrogen nearly 80% lower than the permitted 3.0 mg/L effluent concentration. Further, the process produced a composite Total Nitrogen concentration that was 74% lower than the permitted concentration. This coupling of SND with traditional nitrogen removal resulted in a highly effective process to reduce nitrogen in the municipal wastewater effluent which is also attractive for potential implementation due to the low cost expenditure incurred in its utilization.
Highlights
This study examined the effect of these combined processes on the fate and transport of the nitrogen species during the treatment process
The present research evaluated the treatment of municipal wastewater with traditional nitrogen removal combined with simultaneous nitrification denitrification
This evaluation of water treatment is unique as it is conducted at municipal full scale advance wastewater treatment facility in the city of Graceville, Florida
Summary
The organic nitrogen within wastewater in engineered collections systems is converted into ammonia via the anaerobic microbial process termed as ammonification. This process results into 70% - 90% of the nitrogen entering into water reclamation systems as ammonia-nitrogen (USEPA, 2010) [3]. Within such systems, the ammonia-nitrogen is converted to nitrate-nitrogen thru nitrification, which is the process by which autotrophic microorganisms convert ammonia-nitrogen to nitrate-nitrogen typically within an aerobic environment. This is followed by the process by which heterotrophic microorganisms within an anoxic environment convert the nitrate-nitrogen to nitrogen gas known as denitrification
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