Intermittent aeration improving activated granular sludge granulation for nitrogen and phosphorus removal from domestic wastewater

Jian, Huang; Xu, Linji; Guo, Yinying; Liu, Deshao; Chen, Shuangkou; Tang, Qian; Zheng, Haotian; Tan, Jun; Feng, Peng

doi:10.1016/j.biteb.2021.100739

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…The removal efficiencies of COD and NH 4 + -N in this combined system were similar to those of the conventional aeration process (80.01%, 99.03%) (Huang et al, 2021) and SBR process (91.10%, 87.40%) (Zhao et al, 2021). It had reported that DO was the key factor affecting the heterotrophic denitrifying bacteria, which could simultaneously remove organic matters and nitrogen by using nitrate as electron acceptor and organic carbon as electron donor (Song et al, 2020).…”

Section: Reactor Performance For Pollutant Removalsupporting

confidence: 62%

Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Jin

Liu

Jia

et al. 2022

Water Environment Research

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In this study, a combined system with simultaneous nitrification, denitrification, and phosphorus removal was operated in continuous low oxygen aeration mode, and the effect of lower oxygen aeration (dissolved oxygen [DO] 0.5–1.5 mg/L) on its performance was examined. The combined system consisted of sludge and high‐efficiency biological packing and was operated using four carbon/nitrogen ratios (C/N) with being 10:1, 8:1, 6:1, 10:1. Experimental results showed that the combined system could perform an efficient nitrogen and phosphorus removal under low DO and C/N ratio of 8:1 condition, and removal efficiencies of chemical oxygen demand (COD), NH4+‐N, and PO43−‐P were 80.01%, 99.03%, and 89.51%, respectively. High‐throughput analysis indicated that the functional species of denitrifying bacteria, including Ferruginibacter Azospira, Comamonas, Bacilli, Hyphomicrobium, Thauera, and Comamonadaceae, were important participants in biological nutrient removal. Meanwhile, Acinetobacter was enriched in the combined system, which contributed to phosphorus removal. Practitioner Points A combined system was operated firstly under continuous low oxygen condition. The lower dissolved oxygen (DO) of the combined system was maintained at 0.50–1.5 mg/L level. The combined system could realize simultaneous phosphorus and nitrogen removal under C/N ratio of 8:1. Several functional bacteria were enriched in the coupled systems.

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Section: Reactor Performance For Pollutant Removalsupporting

confidence: 62%

Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Jin

Liu

Jia

et al. 2022

Water Environment Research

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“…Due to the rapid application of intermittent aeration, it was not possible to accurately evaluate the energy savings at NWL. However, savings of up to 40% can be expected (Huang et al 2021). Blower consumption decreased from 11,091 MWh/year in 2019 to 5490 MWh/year in 2020, although the decrease in influent load between these two years was less than 10%.…”

Section: Wwtp Nwlmentioning

confidence: 97%

Improved nitrogen removal efficiency by implementation of intermittent aeration

Srb

Lansky

Charvátová

et al. 2022

Water Science and Technology

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The aim of the paper was to verify the possibility of using intermittent aeration to decrease outflow total nitrogen concentrations in municipal WWTPs of different capacities (15,780 PE, 23,000 PE, 806,250 PE). A simple time-based intermittent aeration control was used in the experimental work. The results of WWTPs are compared with each other and with literature sources. The use of intermittent aeration led to significant decrease of outflow total nitrogen concentration by up to 57% without the need of additional investment costs or the increase of operating costs. Nitrification kinetic tests and fluorescence in-situ hybridization observations proved that intermittent aeration has no negative impact on nitrifiers. The results proved that it is possible to utilize intermittent aeration for treatment plants initially designed with permanent aeration of nitrification sections if the current load is lower than the designed capacity. A necessary prerequisite for successful implementation of intermittent aeration is sufficient blower power. Although the time-based control is very simple and inexpensive to implement, the results are comparable to more complex systems such as systems based on rule-based systems for N-NH4+ and N-NO3− concentrations, on fuzzy logic or on mathematical models.

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“…At the stable status (Figure 3a), AnGS particles became granules with diameters of about 1.0−1.5 mm, which were much larger than those observed in our previous study without micro-aeration. 11 Micro-aeration thus facilitated the selfagglomeration of microorganisms.…”

Section: Acs Esandt Watermentioning

confidence: 99%

“…However, there are some obstacles that hinder the widespread use of the hybrid UASB and SBR system, such as a long start-up period, low stability, and disintegration. , In order to effectively capture a majority of the organic matter within a short retention time in the UASB, micro-aeration is employed, which accelerates the hydrolysis of organics (the rate-limiting step of the anaerobic process). , Proper micro-aeration in the UASB system does not hinder the formation of anaerobic granular sludge (AnGS) . On the other hand, the SBR system presents high potential for nitrogen and phosphorus removal.…”

Section: Introductionmentioning

confidence: 99%

Efficient Treatment and Simultaneous Energy Recovery from Cattle Wastewater by the Micro-Aerated UASB and SBR Coupled System

Xu,

Huang,

et al. 2023

ACS EST Water

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The present study introduces a coupled system comprising an upflow anaerobic sludge blanket (UASB) and a sequencing batch reactor (SBR) to treat intensive cattle farming wastewater. The results confirmed that the optimal conditions for UASB were an organic load rate of 9.98 kg-COD m–3·day–1, a C/N ratio of 22, and a hydraulic retention time (HRT) of 1.5 h. For the SBR reactor, the optimal conditions are a dissolved oxygen (DO) concentration of 6.08 mg L–1 and the S2 aeration mode. Under these optimal conditions, the study achieved anaerobic and aerobic sludge granules (0.25–0.5 and 0.5–0.75 mm) with excellent properties due to the cooperation of a functional microbial community, including Synergistetes, Thermotogae, Acidobacteria, Proteobacteria, Chloroflexi, and Hyd24–12 in UASB and Paracoccus, Proteobacteria, Chloroflexi, and Acinetobacter in SBR. This hybrid system contributed 94% of chemical oxygen demand (COD), 90% of NH4 +-N, 90% of TN, and 61% of TP. Additionally, it achieved 18% net energy recovery from the real cattle wastewater, indicating that the UASB–SBR-coupled system holds potential as an approach for treating and recovering energy from cattle wastewater.

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Intermittent aeration improving activated granular sludge granulation for nitrogen and phosphorus removal from domestic wastewater

Cited by 7 publications

References 40 publications

Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Simultaneous phosphorus and nitrogen removal with different C/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

Improved nitrogen removal efficiency by implementation of intermittent aeration

Efficient Treatment and Simultaneous Energy Recovery from Cattle Wastewater by the Micro-Aerated UASB and SBR Coupled System

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