Mainstream deammonification with ANITA™Mox Process

Summary

ANITA™Mox process is a single-stage deammonification process utilizing moving bed biofilm reactor (MBBR) technology. Previous studies demonstrated that Integrated Fixed-Film Activated Sludge (IFAS) configurationwas an effective approach to improve the ANITA™Mox performance for sidestream treatment. In this study, IFAS ANITA™Mox was successfully applied as a mainstream process to treat secondary effluent with low COD content at both pilot- and prototype-scale. The IFAS ANITA™Mox unique feature of easy and robust separation system (i. e. media sieves) to retain anammox biomass in the reactor is a clear advantage for mainstream application. Continuous bioaugmentation strategies based on carriers recirculation and alternating feed between sidestream and mainstream have been developed to boost anammox activity and strongly repress the NOB. Preliminary pilot trialson low COD effluent from C-stage MBBR achieved NH₄ removal rate of 1.4 g/(m²·d) at 23°C. Results from a 50 m3 prototype where thebioaugmentation strategy was implemented show efficient suppression of the NOB activity while achieving a N-removal rate up to 0.3 kg/(m³·d) at 18°C after only a few months of operation which is already higher than what is commonly achieved in conventional activated sludge systems. Additional studies are underway to further demonstrate the advantage of the IFAS ANITA™Mox process for mainstream deammonification application and how this process can be integrated in a general WWTP scheme to deliver all the foresee benefits on energy recovery and OPEX savings.

Key words

biofilm , anammox , ANITA™Mox , deammonification , IFAS , mainstream , MBBR , nitritation , sidestream

Advanced methods of removing nitrogen from wastewater
(a review)

Summary

In the context of natural mineral and energy resource shortage the research and industrial practice in many countries are focused on using wastewater for domestic and industrial needs, nutrients (nitrogen and phosphorus) for agriculture and also energy feedstock that provides for the energy generation levels that exceed the demand of the treatment facilities. The energy-efficient approaches developed in recent decades for the biological removal of nitrogen from wastewater are considered: partial nitrification-Anammox for the treatment of return flows of anaerobic sludge digestion and the main wastewater flow; DEAMOX for co-processing of municipal wastewater and wastewater with a high nitrate content; CANDO for direct energy recovery based on nitrogen-containing wastewater components; ANITA SHUNT for wastewater treatment with a low COD/N ratio; ANITA MOX carried out in the MBBR reactor that ensures simultaneous partial nitrification and Anammox process. In order to effectively promote these technological processes intensive research is being conducted in the field of studying microbial ecology and the mechanism of metabolic processes, increasing the stability of processes and energy recovery efficiency, developing combined flow schemes for recovering energy and nutrients, and also modeling biochemical processes.

Key words

wastewater , anammox , ANITA™Mox , nitrogen compounds , partial nitrification , SHARON , DEAMOX , CANDO , ANITA SHUNT