Encapsulation of microorganisms for simultaneous nitrification and denitrification in aerobic reactors

Li, Hua; Liu, Qingsong; Yang, Ping; Duan, Yafei; Zhang, Jiasong; Li, Chunhou

doi:10.1016/j.jece.2021.105616

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…The improvement of ammonia-nitrogen nitrogen reduction with PVA gel beads indicated that the active core and highly porous immobilized biofilm carriers developed an efficient denitrification microreactor. Each PVA gel bead with high specific surface areas provided an anoxic microenvironment when placed in an aerobic reactor (Li et al, 2021). On the other hand, the microbes (living cells) are contained in a porous polymeric matrix that allows substrate molecules to diffuse in and product molecules to diffuse out (Pham & Tho Bach, 2014).…”

Section: Biological Treatment Process By Sequencing Batch Reactor Wit...mentioning

confidence: 99%

Ammonia-Nitrogen Reduction in Low Strength Domestic Wastewater by Polyvinyl Alcohol (PVA) Gel Beads

Sabli¹,

Zakaria²

2022

JST

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This study aimed to evaluate the efficacy of polyvinyl alcohol (PVA) gel beads as an immobilized biofilm carrier to enhance the reduction rate of Ammonia-Nitrogen (NH3-N) and Chemical Oxygen Demand (COD) in domestic wastewater. Laboratory scale reactors were developed to assess the reduction levels of ammonia-nitrogen and COD with and without PVA gel beads using optimal and non-optimal treatment mode settings based on operation procedures from the sewage treatment plant in Taman Kajang Utama, Selangor. The treatment method used is an activated sludge sequencing batch reactor with a treatment cycle duration of 288 minutes. The findings showed the ammonia-nitrogen reduction by non-optimal treatment mode is more effective, with a reduced rate of 62.96% to 65.71% compared to optimal treatment mode with a reduced rate of 30.94% and treatment without PVA gel beads (optimal and non-optimal) with a reduced rate of 32.41% to 47.85%. The ammonia-nitrogen reduction rate using PVA gel beads for non-optimal treatment mode was significantly increased from 17.86% to 18.82% and complied with ammonia-nitrogen reduction parameter 10mg/L, Standard A of Environmental Quality (Sewage) Regulations 2009 (EQSR 2009). The rate of COD reduction using the non-optimal treatment mode was also more stable, with a reduced rate of 70.68%. It was also found that the COD reduction rate using PVA gel beads for the non-optimal mode was better than the optimal mode, which was 70.68% compared to 42.0%, and both treatment modes complied with COD reduction parameters 120mg/L, Standard A of EQSR 2009.

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Section: Biological Treatment Process By Sequencing Batch Reactor Wit...mentioning

confidence: 99%

Ammonia-Nitrogen Reduction in Low Strength Domestic Wastewater by Polyvinyl Alcohol (PVA) Gel Beads

Sabli¹,

Zakaria²

2022

JST

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“…Moreover, optimization carbon-to-nitrogen ratio, DO concentration, carrier materials, and other strategies have been used for SND startup and stable running ( Dobbeleers et al, 2017 ; Iannacone et al, 2019 ; Salcedo Moyano et al, 2021 ). However, the denitrification process under aerobic conditions is rarely reported, and little information about the SND microbiota is available ( Liu et al, 2019 ; Li et al, 2021a ). In the future, giving insights into the SND process and optimizing SND startup, including the design of proper wastewater treatment plant, dynamic microbiota of the running bioreactors, and recovering the association between functional microbiota and running performance, are necessary for industrial-scale nitrogen wastewater treatment with SND process.…”

Section: The Traditional Biological Nitrogen Removal Process and Simultaneous Nitrification-denitrification Processmentioning

confidence: 99%

Advances in Studies on Microbiota Involved in Nitrogen Removal Processes and Their Applications in Wastewater Treatment

et al. 2021

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The discharge of excess nitrogenous pollutants in rivers or other water bodies often leads to serious ecological problems and results in the collapse of aquatic ecosystems. Nitrogenous pollutants are often derived from the inefficient treatment of industrial wastewater. The biological treatment of industrial wastewater for the removal of nitrogen pollution is a green and efficient strategy. In the initial stage of the nitrogen removal process, the nitrogenous pollutants are converted to ammonia. Traditionally, nitrification and denitrification processes have been used for nitrogen removal in industrial wastewater; while currently, more efficient processes, such as simultaneous nitrification-denitrification, partial nitrification-anammox, and partial denitrification-anammox processes, are used. The microorganisms participating in nitrogen pollutant removal processes are diverse, but information about them is limited. In this review, we summarize the microbiota participating in nitrogen removal processes, their pathways, and associated functional genes. We have also discussed the design of efficient industrial wastewater treatment processes for the removal of nitrogenous pollutants and the application of microbiome engineering technology and synthetic biology strategies in the modulation of the nitrogen removal process. This review thus provides insights that would help in improving the efficiency of nitrogen pollutant removal from industrial wastewater.

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Strategies for ammonia recovery from wastewater: a review

Farghali,

Chen,

Osman

et al. 2024

Environ Chem Lett

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The circular economy requires advanced methods to recycle waste matter such as ammonia, which can be further used as a fuel and a precursor of numerous value-added chemicals. Here, we review methods for the recovery of ammonia from wastewater with emphasis on biological and physicochemical techniques, and their applications. Biological techniques involve nitrification, denitrification, and anammox processes and the use of membrane bioreactors. Physicochemical techniques comprise adsorption, membrane filtration, ion exchange, chemical precipitation, ammonia stripping, electrochemical oxidation, photocatalytic oxidation, bioelectrochemical systems, and membrane hybrid systems. We found that nitrification and anammox processes in membrane bioreactors stand out for their cost-effectiveness, reduced sludge production, and energy efficiency. The use of struvite precipitation is an efficient, environmentally friendly, and recyclable method for ammonia removal. Membrane hybrid systems are promising for ammonia recovery, nutrient concentration, and wastewater treatment, with applications in fertilizer production and water purification. Overall, nitrogen removal ranges from 28 to 100%, and nitrogen recovery ranges from 9 to 100%.

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Encapsulation of microorganisms for simultaneous nitrification and denitrification in aerobic reactors

Cited by 6 publications

References 33 publications

Ammonia-Nitrogen Reduction in Low Strength Domestic Wastewater by Polyvinyl Alcohol (PVA) Gel Beads

Ammonia-Nitrogen Reduction in Low Strength Domestic Wastewater by Polyvinyl Alcohol (PVA) Gel Beads

Advances in Studies on Microbiota Involved in Nitrogen Removal Processes and Their Applications in Wastewater Treatment

Strategies for ammonia recovery from wastewater: a review

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