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Media type:
E-Book
Title:
Optimization of Microbial Cultivation Using Mathematical Representations Accounting for the Reaction Kinetics in Two-Stage Nitritation/Anammox Process
Description:
The mass cultivation of anaerobic ammonium oxidation (ANAMMOX) is one of the major barriers in improving the potential of the ANAMMOX process. In this study, a mathematical representation accounting for the reaction kinetics was used to improve the cultivation rate of ANAMMOX microorganisms in the pilot-scale partial nitritation (PN)/ANAMMOX process. The high total chemical oxygen demand (TCOD)/N ratio caused by the addition of an antifoam agent adversely affected the nitrogen conversion rate in the PN reactor. A control strategy of the hydraulic retention time (HRT) and the mixed liquid suspended solid (MLSS) concentration calculated by the mass balance-based model was proposed to alleviate the inhibitory effect. Control of the MLSS concentration with a high TCOD/N ratio resulted in a higher nitrite production rate (NPR) that was suitable for enhancing the cultivation rate of the ANAMMOX microorganisms. Based on the performance in the optimized PN, the observed yield of ANAMMOX microorganisms was calculated to be 0.091 gVSS/gNH4+-N. The biomass as volatile suspended solids (VSS) wasted was 309.8–554.3 gVSS/d. Based on the reaction kinetics of ANAMMOX, the quantity of stored microorganisms over time was simulated using a modified first-order exponential decay model; the calculated value was 6.3–11.2 kg/m3/year. These results can be used for the scale-up or design of the ANAMMOX process