Selenite reduction and ammoniacal nitrogen removal in an aerobic granular sludge sequencing batch reactor

Nancharaiah, Y.V.; Sarvajith, M.; Lens, Piet N.L.

doi:10.1016/j.watres.2017.12.028

Cited by 75 publications

(15 citation statements)

References 38 publications

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“…Recovery of phosphate, orthophosphate, and other phosphoric compounds through METs is achieved in the form of struvite. Generally, struvite consists of phosphate, ammonium, and magnesium existing in equivalent molar ratios and precipitates easily at a higher alkaline condition (Nancharaiah et al, 2018). Firstly, Fischer et al developed a MFC by dosing ammonium hydroxide and magnesium chloride to enhance the recovery efficiency of phosphate in the form of struvite.…”

Section: Removal and Recovery Of Phosphate Through Different Types Of Metsmentioning

confidence: 99%

A Sustainable Approach for the Production of Green Energy With the Holistic Treatment of Wastewater Through Microbial Electrochemical Technologies: A Review

2021

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With the plausible depletion of fossil fuels in the near future and its associated environmental impacts, researchers have instigated the search for eco-friendly renewable bioenergy. Moreover, the increase in water pollution by industrial and anthropogenic activities is another alarming global concern. In this regard, the production of renewable and sustainable green bioenergy utilizing wastewater through microbial electrochemical technologies (METs) can alleviate these crucial problems by providing a sustainable solution to meet both the demands of energy and fresh water supply. Moreover, different bio-centered techniques such as nitrification and denitrification for nitrogen removal, and elimination of carcinogenic metals, pathogens, and organic components utilizing microbiota followed by toxicity sensing of different pollutants have been efficaciously exhibited through METs. However, inferior bioenergy production and recovery of low biomass yield in METs with high operational cost are noteworthy bottlenecks that hinder the scalability of this technology. Therefore, this review elaborates different physicochemical factors affecting the performance of METs, microbial interaction for the development of stable biofilm and so forth. Moreover, a broad overview on the production of bioenergy, along with the removal of pollutants from wastewater through different types of METs are also highlighted. Furthermore, the production of biofuels like ethanol, methanol, biodiesel, and gaseous fuel like bio-H2 coupled with power generation using photosynthetic microorganisms via CO2 sequestration through METs are also discussed. Additionally, recent developments with future scope for the field-scale implementation of METs along with their bottlenecks have been discussed, which has not been critically reviewed to date.

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Section: Removal and Recovery Of Phosphate Through Different Types Of Metsmentioning

confidence: 99%

A Sustainable Approach for the Production of Green Energy With the Holistic Treatment of Wastewater Through Microbial Electrochemical Technologies: A Review

2021

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“…Selenium-containing wastewaters can be treated, aerobically, in activated sludge systems, where the selenium oxyanions are reduced to elemental selenium by the microorganisms present in the activated sludge flocs. Aerobic reduction of selenium oxyanions to either volatilized selenium compounds followed by gas trapping (Kagami et al, 2013) or selenium trapped in the biomass of aerobic microorganisms such as Bacillus cereus (Dhanjal & Cameotra, 2010) and Escherichia coli (Dobias et al, 2011) as well as biomass from aerobic granular sludge (Nancharaiah et al, 2018), continuous (Jain et al, 2016) or sequencing batch (Mal et al, 2017) reactors, activated sludge provides a one-step process for treatment of selenite-containing wastewaters.…”

Section: Aerobic Reactorsmentioning

confidence: 99%

In situ and ex situ bioremediation of seleniferous soils and sediments

Wadgaonkar¹,

Lens²

2021

Environmental Technologies to Treat Selenium Pollution

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The importance of environmental selenium (Se) research has been increasingly recognized during the last decade (Nancharaiah & Lens, 2015a;Tan et al., 2016). The concerns about Se toxicity began in the 1930s, when symptoms for alkali disease and blind staggers were observed in livestock grazing on grass grown on Se-enriched soil in South Dakota (Tinggi, 2003). On the other hand, Se deficiency was brought to the forefront in the 1960s with identification of a peculiar heart muscle disease symptom, called Keshan's disease, in China (Chen, 2012).In animals and humans, selenium plays an important role in the redox regulation of intracellular signaling, redox homeostasis and thyroid hormone metabolism (Huawei, 2009;Papp et al., 2007). To avoid deficiency and toxicity, the United States National Academy of Sciences Panel on Dietary Oxidants and Related Compounds recommended a dietary allowance of 55 µg Se day −1 in humans and set an upper tolerable limit of 400 µg Se day −1 (World Health Organization, 2011). The United Kingdom Expert Group on Vitamins and Minerals ( 2003) recommended a minimum intake of 60 µg Se day −1 for women and 70 µg Se day −1 for men.The amount of selenium in the food chain, and thus in the human diet, depends on the selenium concentrations in the soil. Therefore, soil is the most important part of

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“…On the other hand, the elemental Se at the nanoscale is less toxic and has been extensively used in a wide variety of fields, such as chemical, medicinal, electrical, and optoelectronics, due to its unique properties, including high photoconductivity, photocatalysis, thermoelectric response, and nonlinear optical response. − Nanoparticles (NPs), due to the large surface energy and high activity, are the pivotal forms of Se materials for high-technological applications. Therefore, a number of physical, − chemical, − and biological , methods have been developed for the synthesis of SeNPs with suitable starting precursors. The biological methods are generally recognized as “green” approaches .…”

Section: Introductionmentioning

confidence: 99%

“…2−5 Nanoparticles (NPs), due to the large surface energy and high activity, are the pivotal forms of Se materials for high-technological applications. Therefore, a number of physical, 6−8 chemical, 9−11 and biological 12,13 methods have been developed for the synthesis of SeNPs with suitable starting precursors. The biological methods are generally recognized as "green" approaches.…”

Section: ■ Introductionmentioning

confidence: 99%

Photochemical Synthesis of Selenium Nanospheres of Tunable Size and Colloidal Stability with Simple Diketones

Zhang

Gan

et al. 2021

Langmuir

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Temporal and spatial segregations are two fundamental requirements for the successful synthesis of nanoparticles (NPs). To obtain colloidally stable selenium nanospheres (SeNSs), surfactants or polymers are generally needed as structure-directing agents or stabilizers in the reduction approaches for SeNP synthesis. The addition of such chemicals sacrifices the purity of the obtained SeNPs and, therefore, is detrimental to the applications. Here, for the first time, we report that low-molecular weight (less than six carbons) diketones are excellent photoreductants for green and tunable synthesis of SeNPs, owing to their merits in temporal and spatial control. With simple diketones as the photoreductants, the resultant SeNPs were pure and colloidally stable with nice photoelectronic properties. This finding not only provides a useful strategy for the synthesis of SeNPs but also might be a milestone in the development of ketone photochemistry.

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Selenite reduction and ammoniacal nitrogen removal in an aerobic granular sludge sequencing batch reactor

Cited by 75 publications

References 38 publications

A Sustainable Approach for the Production of Green Energy With the Holistic Treatment of Wastewater Through Microbial Electrochemical Technologies: A Review

A Sustainable Approach for the Production of Green Energy With the Holistic Treatment of Wastewater Through Microbial Electrochemical Technologies: A Review

In situ and ex situ bioremediation of seleniferous soils and sediments

Photochemical Synthesis of Selenium Nanospheres of Tunable Size and Colloidal Stability with Simple Diketones

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