Bacterial-algae biofilm enhance MABR adapting a wider COD/N ratios wastewater: Performance and mechanism

Zhang, Han; Gong, Wenyu; Zeng, Weichen; Chen, Rui; Lin, Dachao; Li, Guibai

doi:10.1016/j.scitotenv.2021.146663

Cited by 35 publications

(11 citation statements)

References 41 publications

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“…3a, the concentration of ammonia nitrogen showed a good linear decrease with reaction time till 5 h, well following the zeroorder reaction kinetics with a rate constant of 7.84 mg L −1 h −1 and decreased to near 0 mg L −1 after 7 h, indicating the excellent ammonia oxidation capability of the well-developed nitrifying biofilm on hollow fiber membranes. The zero-order reaction kinetics for ammonia nitrogen removal was also confirmed in a MABR 14 with one-step biofilm enrichment but a low rate constant of 0.7-1.5 mg L −1 h −1 was achieved, which might be due to the competitive oxygen uptake by heterotrophic bacteria in the not-well stratified biofilm. The concentration of nitrite nitrogen showed a slight increase in 2-4 h followed by a decrease to the baseline value in 4-6 h but was always kept at a very low level of 0.66-1.36 mg L −1 , indicating the occurrence of full nitrification and denitrification.…”

Section: Biofilm Enrichment Of the Mabr For Carbon And Nitrogen Removalmentioning

confidence: 74%

“…This could be limited by oxygen supply, similar to a MABR study under high ammonia and COD loading rates. 14 Aeration pressure is a key operational parameter that affects the oxygen supply into the biofilm in the MABR. 15,16 Thus, a stepwise increase of aeration pressure with the same HRT of 3 h was employed to enhance carbon and nitrogen removal in this study.…”

Section: Effect Of Aeration Pressure On the Mabr Treating Synthetic Municipal Wastewatermentioning

confidence: 99%

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Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

Zhang

Xing

Rong

et al. 2022

Environ. Sci.: Water Res. Technol.

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Section: Biofilm Enrichment Of the Mabr For Carbon And Nitrogen Removalmentioning

confidence: 74%

Section: Effect Of Aeration Pressure On the Mabr Treating Synthetic Municipal Wastewatermentioning

confidence: 99%

Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

Zhang

Xing

Rong

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…Membrane aerated biofilm reactor (MABR) is a novel type of wastewater treatment system in which the hydrophobic membrane acts as a biofilm carrier and is used as bubble-free air diffuser. In a recent study, Zhang et al [ 129 ] have shown that a significant increase in nitrogen removal efficiency was observed in a membrane aerated bacteria-algae biofilm reactor (MABAR) in comparison with MABR. The increase in nitrogen removal was attributed to the algal assimilation.…”

Section: Microalgae-bacterial Systems For Wastewater Treatmentmentioning

confidence: 99%

A comprehensive review on the use of algal-bacterial systems for wastewater treatment with emphasis on nutrient and micropollutant removal

et al. 2022

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The scarcity of water resources and environmental pollution have highlighted the need for sustainable wastewater treatment. Existing conventional treatment systems are energy-intensive and not always able to meet stringent disposal standards. Recently, algal-bacterial systems have emerged as environmentally friendly sustainable processes for wastewater treatment and resource recovery. The algal-bacterial systems work on the principle of the symbiotic relationship between algae and bacteria. This paper comprehensively discusses the most recent studies on algal-bacterial systems for wastewater treatment, factors affecting the treatment, and aspects of resource recovery from the biomass. The algal-bacterial interaction includes cell-to-cell communication, substrate exchange, and horizontal gene transfer. The quorum sensing (QS) molecules and their effects on algal–bacterial interactions are briefly discussed. The effect of the factors such as pH, temperature, C/N/P ratio, light intensity, and external aeration on the algal-bacterial systems have been discussed. An overview of the modeling aspects of algal-bacterial systems has been provided. The algal-bacterial systems have the potential for removing micropollutants because of the diverse possible interactions between algae-bacteria. The removal mechanisms of micropollutants – sorption, biodegradation, and photodegradation, have been reviewed. The harvesting methods and resource recovery aspects have been presented. The major challenges associated with algal-bacterial systems for real scale implementation and future perspectives have been discussed. Integrating wastewater treatment with the algal biorefinery concept reduces the overall waste component in a wastewater treatment system by converting the biomass into a useful product, resulting in a sustainable system that contributes to the circular bioeconomy.

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“…Researchers have also investigated novel combinations of MABRs with other technologies, including microbial electrolysis cells (Paepe et al 2020) and membrane bioreactors (MBRs) (Daigger 2020). Novel bacterial-algae biofilms have also been developed in MABRs to treat wastewater of wider COD/N ratios (Zhang et al 2021). It is foreseeable that the expanded use of MABRs and novel treatment processes will result in new research questions to be pursued, such as adequate mass transfer models, dynamic biofilm attachment/detachment, resilience design, and life cycle analysis (LCA).…”

Section: Current Challenges and Outlookmentioning

confidence: 99%

“…This paper reviews the further accumulated knowledge and recent advances from the growing commercial installations. Moreover, current lab-scale research is moving towards a deeper understanding of membrane-aerated biofilms (MABs), including the metabolic pathways (Tian et al 2019;Tian et al 2020), MAB formation (Hu et al 2020), predation activities (Aybar et al 2019;Kim et al 2020), and novel microbial compositions (Zhang et al 2021). Process modeling is also improving to facilitate MABR design and operation (Chen et al 2020;Carlson et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Recent progress using membrane aerated biofilm reactors for wastewater treatment

Wagner

Carlson

et al. 2021

Water Science and Technology

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The membrane biofilm reactor (MBfR), which is based on the counter diffusion of the electron donors and acceptors into the biofilm, represents a novel technology for wastewater treatment. When process air or oxygen is supplied, the MBfR is known as the membrane aerated biofilm reactor (MABR), which has high oxygen transfer rate and efficiency, promoting microbial growth and activity within the biofilm. Over the past few decades, lab-scale studies have helped researchers and practitioners understand the relevance of influencing factors and biological transformations in MABRs. In recent years, pilot- to full-scale installations are increasing along with process modeling. The resulting accumulated knowledge has greatly improved understanding of the counter-diffusional biological process, with new challenges and opportunities arising. Therefore, it is crucial to provide new insights by conducting this review. This paper reviews wastewater treatment advancements using MABR technology, including design and operational considerations, microbial community ecology, and process modeling. Treatment performance of pilot- to full-scale MABRs for process intensification in existing facilities is assessed. This paper also reviews other emerging applications of MABRs, including sulfur recovery, industrial wastewater, and xenobiotics bioremediation, space-based wastewater treatment, and autotrophic nitrogen removal. In conclusion, commercial applications demonstrate that MABR technology is beneficial for pollutants (COD, N, P, xenobiotics) removal, resource recovery (e.g., sulfur), and N2O mitigation. Further research is needed to increase packing density while retaining efficient external mass transfer, understand the microbial interactions occurring, address existing assumptions to improve process modeling and control, and optimize the operational conditions with site-specific considerations.

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Bacterial-algae biofilm enhance MABR adapting a wider COD/N ratios wastewater: Performance and mechanism

Cited by 35 publications

References 41 publications

Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

A comprehensive review on the use of algal-bacterial systems for wastewater treatment with emphasis on nutrient and micropollutant removal

Recent progress using membrane aerated biofilm reactors for wastewater treatment

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