Process performance optimization and mathematical modelling of a SBR-MBBR treatment at low oxygen concentration

Ferrentino, Roberta; Ferraro, Alberto; Mattei, Maria Rosaria; Esposito, Giovanni; Andreottola, Gianni

doi:10.1016/j.procbio.2018.08.023

Cited by 27 publications

(9 citation statements)

References 39 publications

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“…The total nitrogen removal was mainly due to the SND process in the reactor. In particular, when the aeration phase was turned off, the DO in the reactor decreased from about 2-3 to 0 mg•L −1 Once the biofilm was growing, the invariance of the data of organic removal performance confirms the results reported by other authors concerning the intermittent aeration strategy applied to other installations [20,21]. Therefore, the HMBBR under intermittent aeration showed that the growth of heterotrophic biomass as biofilm is a further advantage in terms of COD removal and biological process stability.…”

Section: Nitrification and Denitrification Phenomenasupporting

confidence: 86%

“…The organic removal performance increased slowly with the growth of attached biomass: the average organic removal increased from 81% to 87% during the continuous aeration period (Phase I), and 93%-95% in the subsequent periods with intermittent aeration, despite the increase in OLR in the Periods 2B and 3B. Once the biofilm was growing, the invariance of the data of organic removal performance confirms the results reported by other authors concerning the intermittent aeration strategy applied to other installations [20,21]. Therefore, the HMBBR under intermittent aeration showed that the growth of heterotrophic biomass as biofilm is a further advantage in terms of COD removal and biological process stability.…”

Section: Cod Removal and Biomass Growthsupporting

confidence: 86%

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Intermittent Aeration in a Hybrid Moving Bed Biofilm Reactor for Carbon and Nutrient Biological Removal

Bella

Mannina

2020

Water

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The paper presents an experimental study on a lab scale hybrid moving bed biofilm reactor with intermittent aeration. Specifically, a comparison between two different operating conditions was analyzed: continuous and intermittent aeration. Both continuous and intermittent aeration were monitored and compared in order to get the best operational conditions. The intermittent aeration campaign was sub-divided in three phases with different duration of alternation of aerobic and anoxic times and organic and nitrogen loading rates. The efficiency of N-removal improved by 70% during the intermittent aeration. The best condition was observed with 40 min of aeration and 20 min of no-aeration, an organic loading rate of 2.2 kgCODm−3day−1 and a nitrogen loading rate of 0.25 kgNm−3day−1: under these operational conditions the removal efficiencies for carbon and nitrogen were 93% and 90%, respectively. The derived results provide the basis for WWTP upgrade in order to meet stricter effluent limits at low energy requirements.

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Section: Nitrification and Denitrification Phenomenasupporting

confidence: 86%

Section: Cod Removal and Biomass Growthsupporting

confidence: 86%

Intermittent Aeration in a Hybrid Moving Bed Biofilm Reactor for Carbon and Nutrient Biological Removal

Bella

Mannina

2020

Water

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“…[15,16]. To date, various variants of technological purification schemes have been developed using the principles of nitrification and denitrification [17,18].…”

Section: Introductionmentioning

confidence: 99%

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

Makisha

2021

Hydrology

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The research revealed in the paper considers the improvement of secondary treatment of wastewater in the aerobic reactor to provide removal of organics and nutrients. There were five types of polymer biofilm carriers taken into account initially; however, two of them were decided not to apply due to technological reasons. The main part of the research was divided into three substages to investigate each type of biofilm carrier. According to the literature review, the optimal efficiency may be reached if the carrier filling ratio is 10 to 30% of reactor volume. On this basis, there were three benches launched at each sub-stage with a corresponding filling ratio of 10, 20, and 30%. The fourth reactor at each sub-stage had no floating carrier to control the experiment. The research of all three types of carriers showed the effect of BOD removal in the range of 95–96% for benches equipped with a floating carrier, which can be considered similar to the control bench with the efficiency of 92%. In the case of ammonia nitrogen, the removal control bench showed only 55% of efficiency, while floating carriers helped to increase the efficiency up to 70–86%. Despite obtaining relatively positive results, the research has to be continued to achieve regulation requirements in treatment quality.

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“…This yield is significantly lower than the sludge yield of conventional activated sludge processes. Table 2 presents the sludge yield comparison between multi-stage AO biofilm process with other activated sludge processes (Ferrentino, Ferraro, Rosaria Mattei, Esposito, & Andreottola, 2018;Fujii, 1996;Yonglei et al, 2018Yonglei et al, , 2014Zhen et al, 2014). It can be seen that the sludge mass generated in multi-stage A/O biofilm reactor with a new type of floating spherical carriers was much lower than other biofilm processes, such as traditional A/O process and sequencing batch reactor (SBR)-MBBR system.…”

Section: Sludge Reduction Effectmentioning

confidence: 99%

The nitrogen removal and sludge reduction performance of a multi‐stage anoxic/oxic (A/O) biofilm reactor

Wang

Liu³

et al. 2019

Water Environment Research

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To overcome the problems of high excess sludge yield and poor nitrogen removal efficiency in traditional biological treatment processes, a multi-stage A/O biofilm reactor was developed by combining the multi-stage A/O process with novel floating spherical carriers, resulting in repeated coupling of anoxic and aerobic environments. Results showed that the system achieved COD, NH + 4 − N, and TN removal efficiencies of 93.8%, 84.5%, and 75.7%, respectively, with average effluent concentrations lower than: 29.8 COD mg/L, 4.3 NH + 4 − N mg/L, and 13.2 TN mg/L. The observed sludge yield was 0.139 g MLSS/g COD, which was lower than that of the conventional activated sludge process. Microbial analysis showed that the community structure and cell morphology of microorganisms changed greatly with alternating aerobic-anoxic condition; high-throughput sequencing results proved that functional microorganisms can be enriched on the surface of the carries and therefore improved the nitrogen removal efficiency and meanwhile minimize the sludge yield within the system. • Practitioner points• The research innovatively developed a novel floating spherical carrier and coupled it with multi-stage A/O process. • The complex redox environments inside the floating spherical carriers improves the nitrogen removal efficiency and the sludge reduction effect. • Nitrospirae, Hydrogenophaga promoted the nitrogen removal, Firmicutes, Bacteroidetes and Dechloromonas promoted the in-situ sludge reduction of the system.

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Process performance optimization and mathematical modelling of a SBR-MBBR treatment at low oxygen concentration

Cited by 27 publications

References 39 publications

Intermittent Aeration in a Hybrid Moving Bed Biofilm Reactor for Carbon and Nutrient Biological Removal

Intermittent Aeration in a Hybrid Moving Bed Biofilm Reactor for Carbon and Nutrient Biological Removal

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

The nitrogen removal and sludge reduction performance of a multi‐stage anoxic/oxic (A/O) biofilm reactor

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