Performance evaluation and model-based optimization of the mainstream deammonification in an integrated fixed-film activated sludge reactor. (May 2022)

• Record Type: Journal Article
• Authors: Mehrani, Mohamad-Javad; Azari, Mohammad; Teichgräber, Burkhard; Jagemann, Peter; Schoth, Jens; Denecke, Martin; Mąkinia, Jacek
• Is Part Of: Bioresource technology. Volume 351(2022)
• Publication Date: 2022-05
• Subjects: Optimization -- Mainstream deammonification -- Anammox -- IFAS -- Simulation; IFAS Integrated fixed-film activated sludge -- PCA Principal component analysis -- NRR N-removal rate -- NRE N-removal efficiency -- Anammox Anaerobic ammonium oxidation -- WWTP Wastewater treatment plant -- MBBR Moving bed biofilm reactor -- SRT Solid retention time -- C/N carbon to nitrogen ratio -- DOE Design of experiment -- CFD Computational fluid dynamic -- SBR Sequencing batch reactor -- PN Partial nitrification -- HET Heterotrophic denitrifiers -- HRAS High-rate activated sludge -- IBC Intermediate bulk container -- TSS Total suspended solids -- TN Total nitrogen -- ML(V)SS Mixed liquor (volatile) suspended solids -- TIN Total inorganic nitrogen -- ASM2d Activated Sludge Model No. 2d -- SA Sensitivity Analysis -- ADM1 Anaerobic Digestion Model No. 1 -- FNA Free nitrous acid -- MAE Mean absolute error; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.126942
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Mainstream pilot-scale deammonification was simulated under seasonal temperature. Intermittent aeration strategy plays an important role in stable NOB suppression. The aeration was set to the optimized values (DO = 0.2 mgO2 /L, on/off ratio = 0.05). The nitrogen removal efficiency can enhance from 30% to > 50% (at optimized values). The nitrogen removal rate increased up to 25 gN/m 3 d by optimized aeration values. Abstract: This study aimed to model and optimize mainstream deammonification in an integrated fixed-film activated sludge (IFAS) pilot plant under natural seasonal temperature variations. The effect of gradually decreasing temperature on the performance was evaluated during a winter season and a transition period to summer conditions, and the correlation of the performance parameters was investigated using principal component analysis (PCA). The optimization of intermittent aeration in the long-term (30 days) dynamic conditions with on/off ratio and dissolved oxygen (DO) set-point control was used to maximize the N-removal rate (NRR) and N-removal efficiency (NRE). Optimization results (DO set-point of 0.2–0.25 mgO2 /L, and on/off ratio of 0.05) increased the NRE and NRR of total inorganic N (daily average) from 30% to > 50% and 15 gN/m 3 d to 25 gN/m 3 d, respectively. This novel long-term optimization strategy is a powerful tool for enhancing the efficiency in mainstream deammonification.