Ammonia Oxidizing Bacteria (AOB) kinetic parameters estimated using the actual maximum ammonia oxidation rate

Integrating Online Differential Titrimetry and Dynamic Modelling as Innovative Energy Saving Strategy in a Large Industrial WWTP

“…The calibrated value for the maximum growth rate for AOB (µ AOB ) was 0.58 d −1 , about 30% lower than the default value assumed by the software (0.85 d −1 ). As already described, low µ AOB are reported for industrial wastewaters applications (Szpyrkowicz and Kaul, 2004;Munz et al, 2008;Mannucci et al, 2020). The calibrated value allowed for an accurate simulation of the e uent ammonium concentration also in the validation data set on the year 2019.…”

“…According to Longo et al, 2016, the average energetic consumption for oxygen supply is between 0.18 and 0.80 kWh/m 3 , accounting for more than 45% of the total energy demand in WWTPs, with peaks up to 75%. The optimisation of the aeration process could offer considerable savings in terms of environmental and economic costs but also requires e cient control systems, possibly coupled with models able to properly represent the behaviour of the wastewater treatment plant, especially under highly variable in uent characteristics (Mannucci et al, 2020). In particular, the nitri cation is commonly assumed to be the bottleneck in nitrogen removal processes, because nitri ers have lower growth kinetics and a nity for oxygen and they are more sensitive to a wider variety of inhibitors compared to heterotrophic biomass (Fiocchi et al, 2008).…”

“…In particular, the nitri cation is commonly assumed to be the bottleneck in nitrogen removal processes, because nitri ers have lower growth kinetics and a nity for oxygen and they are more sensitive to a wider variety of inhibitors compared to heterotrophic biomass (Fiocchi et al, 2008). The optimisation of the biological nitri cation is a key-factor to ensure stable treatment e ciency and energy saving (Mannucci et al, 2020). About modelling, comprehensive activated sludge models (ASMs) were proposed and validated to describe the two-step biological nitri cation in which both Ammonia (AOB) and Nitrite (NOB) Oxidising Bacteria growth were described through Monod-like kinetics limited by oxygen and substrate (Munz et al, 2011).…”

“…In this work, an innovative system to optimise nitri cation control was implemented. An on-line differential titrimeter (ODT), developed in previous works (Mannucci et al, 2020), was installed in the large industrial WWTP managed by Consorzio Cuoiodepur S.p.A. (Pisa, IT) and provided real-time AOR estimates over about 1-year operation, acting as an effective biosensor. ODT outcomes were integrated with plant-wide modelling, offering an innovative decision support tool for nitri cation control and optimisation.…”

Integrating online differential titrimetry and dynamic modelling as innovative energy saving strategy in a large industrial WWTP

“…According to Longo et al (2016), the average energetic consumption for oxygen supply is between 0.18 and 0.80 kWh/m 3 , accounting for more than 45% of the total energy demand in WWTPs, with peaks up to 75%. The optimisation of the aeration process could offer considerable savings in terms of environmental and economic costs but also requires efficient control systems, possibly coupled with models able to properly represent the behaviour of the wastewater treatment plant, especially under highly variable influent characteristics (Mannucci et al 2020). In particular, nitrification is commonly assumed to be the bottleneck in nitrogen removal processes, because nitrifiers have lower growth kinetics and affinity for oxygen, and they are more sensitive to a wider variety of inhibitors compared to heterotrophic biomass (Fiocchi et al 2008).…”