Ecofriendly Anaerobic Ammonium Oxidation System: Optimum Operation and Inhibition Control Strategies for Enhanced Nitrogen Removal

Abstract

In practice, the complete autotrophic nitrogen removal or partial-nitritation (PN) and anaerobic ammonium oxidation (ANAMMOX) process (PN/A) has gained immense popularity and widespread application owing to its low operational cost and better treatment possibilities. However, ANAMMOX-based systems are inhibited by numerous factors that pose enormous challenge to the success of this technology. Hence, in lieu of finding optimum operational strategies, a PN/A sequencing batch reactor for treating high-strength ammonia wastewater obtained from an anaerobic digester was evaluated for 400 days. The impact of processing unit cycle strategies on process performance was evaluated with the amalgamation of intermittent feeding and aeration. The ecofriendly and eco-efficient system, adopted in this study, ensured enhanced cost-effective nitrogen removal along with reduction in greenhouse gas (GHG) emissions underlying stringent regulation. Nitrogen removal rate of 81% along with 68% reduction in GHG emissions compared to the conventional nitrification/denitrification system (29% lower than the last reported ANAMMOX system) was successfully achieved. The key concerns in negating the impacts of ANAMMOX inhibition caused by the seven most influential parameters/mechanisms are also addressed.

Nitrogen Removal Performance and Microbial Response of Anammox Under Multiantibiotic Stress: Effect of Static Magnetic Field

“…However, anammox bacteria are known for their slow growth rates, resulting in a long startup period and fluctuating nitrogen removal efficiency during the anammox process. Anammox process is sensitive to a variety of factors, including substrate, temperature, organic matter, and inhibitors. , Particularly, antibiotics in wastewater hinder the biological processes and microbial activity; thus, anammox inhibition has been the subject of numerous investigations. − The anammox response to antibiotics includes microbial population succession, ARGs accumulation, and extracellular polymeric substance (EPS) formation . An anammox granule is a consortia composed of large numbers of microorganisms, with anammox bacteria as the core and other functional bacteria (including heterotrophic denitrifies, ammonia oxidizing bacteria, and fermentative bacteria) as the symbiotic microorganism .…”