Start-up performance and process kinetics of a UASB-Anammox reactor at low substrate concentration

Li, Yun; Cui, Nan; Xuan, Keng; Dan, Xu; Wang, Dongliang; Li, Chaoming; Li, Zebing; Wang, Yufan

doi:10.1016/j.jece.2021.106726

Cited by 20 publications

(2 citation statements)

References 46 publications

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“…Process kinetics modeling is an analytical method that is used for monitoring system performance, the fitted kinetic results used to estimate reactor treatment efficiency under the same operating conditions [32]. The Grau second-order model is the most widely used mathematical model for analyzing the performance of anaerobic reactors and can describe the dynamic behavior of anaerobic bioreactors [33,34].…”

Section: Analysis Of Process Dynamicsmentioning

confidence: 99%

Start-Up Performance and Process Kinetics of a Two-Stage Partial Nitrification–Anaerobic Ammonium Oxidation Reactor

Wang,

Ji,

Zhang

et al. 2024

Water

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The study of two-stage partial nitrification–anaerobic ammonium oxidation (PN/A) reactors, which are advantageous in engineering applications, still lacks research on process kinetics. Therefore, in this study, the start-up performance and process kinetics of a two-stage PN/A reactor were evaluated by controlling the reaction conditions, for which the two reactors were inoculated with sludge, incubated separately, and then operated in tandem. Increasing the ammonia load of the reactor during the 60 d stabilization period resulted in a nitrogen accumulation rate of 96.93% and a [NO2−-N]Eff/[NH4+-N]Eff ratio of 1.33, which is close to the theoretical value of 1.32. Successful initiation of the A reactor was achieved after 55 d of operation by inoculating with anammox-activated sludge and granular activated carbon, and the PN and A reactors then successfully operated in combination for 20 d, with an average NH4+-N efficiency of 99.04% and the NH4+-N load of the A reactor showing an “S-shaped” curve. An analysis of the microbial growth kinetic models indicated that the removal of NH4+-N could be successfully described by the logistic, modified logistic, modified Gompertz, and modified Boltzmann models. A strong association between the model and the dependent variable was observed. The process kinetic analysis showed that the removal of NH4+-N from reactor A could be simulated under steady-state conditions, using the Grau second-order model. The parameters obtained from the model analysis are expected to help predict the denitrification performance of the reactor, facilitate operational management and control, and thus provide a promising research basis for the introduction of automated control systems.

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Section: Analysis Of Process Dynamicsmentioning

confidence: 99%

Start-Up Performance and Process Kinetics of a Two-Stage Partial Nitrification–Anaerobic Ammonium Oxidation Reactor

Wang,

Ji,

Zhang

et al. 2024

Water

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“…To resolve these issues, we conducted continuous feeding tests and immobilized the cells in a polyethylene glycol (PEG) gel carrier (Isaka et al, 2007). Although several types of reactors for anammox processes have been reported, including the SBR, up-flow anaerobic sludge blanket (UASB), and moving-bed bioreactor (MBBR) (Strous et al, 1998;Strous et al, 1999;Sliekers et al, 2003;Furukawa et al, 2006;Dimitrova et al, 2020;Li et al, 2021;Peng et al, 2022). The gel entrapment technique was used to prevent the washout of anammox biomass from the reactor (Isaka et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Long-Term Limitation Effects of Se(VI), Zn(II), and Ni(II) on Start-Up of the Anammox Process Using Gel Carrier

Isaka

Sugawara

Yamazaki

et al. 2022

Front. Bioeng. Biotechnol.

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Anaerobic ammonia oxidation (anammox) bacteria are inhibited by heavy metals at high concentrations but require trace amounts of some heavy-metal elements for growth and activity maintenance. The present study evaluates the long-term limitation effects of Se(VI), Zn(II), and Ni(II) on the start-up period of an anammox reactor. To strictly limit the levels of heavy metals in the reactor, all tests used ultrapure water as the influent synthetic wastewater and all reactors were installed in a clean booth. The anammox biomass was maintained through the gel entrapment technique. In the absence of Se(VI) and Ni(II), the anammox reactor start-up was 18.9 kg-N (m3-carrier d)−1 (nitrogen conversion rate (NCR) per gel carriers), indicating that Se(VI) and Ni(II) are not required or need not be continuously added to maintain the anammox process. Under Zn(II) limitation, the anammox process failed to start-up and the NCR tended to decrease rapidly. After readdition of 0.005 mg L−1 of Zn(II), the NCR did not decline further and instead partially recovered at a very slow rate. The NCR was completely recovered after adding 0.020 mg L−1 of Zn(II). These results reveal that Zn(II) limitation seriously affects the start-up of the anammox process while Se(VI) and Ni(II) are not required or need not be continuously added to the anammox process.

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Effect of phosphorus limitation on the anammox process under different nitrogen concentrations

Tomisaki,

Kondo,

Saito

et al. 2023

Biochemical Engineering Journal

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Start-up performance and process kinetics of a UASB-Anammox reactor at low substrate concentration

Cited by 20 publications

References 46 publications

Start-Up Performance and Process Kinetics of a Two-Stage Partial Nitrification–Anaerobic Ammonium Oxidation Reactor

Start-Up Performance and Process Kinetics of a Two-Stage Partial Nitrification–Anaerobic Ammonium Oxidation Reactor

Long-Term Limitation Effects of Se(VI), Zn(II), and Ni(II) on Start-Up of the Anammox Process Using Gel Carrier

Effect of phosphorus limitation on the anammox process under different nitrogen concentrations

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