Ceramic membrane defouling (cleaning) by air Nano Bubbles

Ghadimkhani, A. A.; Zhang, Wen; Marhaba, Taha F.

doi:10.1016/j.chemosphere.2015.12.023

Cited by 131 publications

(71 citation statements)

References 19 publications

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“…However, in the present experiment, the increase in glucose concentration did not show a significant trend, as the values in Table 1 show. Oxygen nano-bubbling facilitates the chemical reaction at the gas-liquid interface and the formation of OHradicals, which in turn aids organic decomposition [25,26]. The bubbles react with the organic matter contained in the liquid, whereby the organic matter is oxidized and degraded.…”

Section: Effect Of Nbs On Glucose Degradationmentioning

confidence: 99%

“…Furthermore, the glucose degradation was better when hydrogen peroxide was used, even though the improvement was not significantly high. Hydrogen peroxide decomposes to form water and oxygen, and thus can increase the DO concentration above the steady state concentration [26]. In this way, it provides a source of reactive oxygen species, and can be used as an oxygen supplement.…”

Section: Effect Of Nbs On Glucose Degradationmentioning

confidence: 99%

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Extent and persistence of dissolved oxygen enhancement using nanobubbles

Tekile

Kim

Lee

2016

Environmental Engineering Research

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In this study, change in water-dissolved oxygen (DO) was analyzed under various synthetic water qualities and nanobubbles (NBs) application conditions, such as gas type, initial DO as well as water dissolved, suspended and organic matters contents. When oxygen, rather than air, was introduced into nitrogen-desorbed ultra-pure water, the stagnation time was significantly increased. It took ten days for DO concentration to drop back to saturation. The higher the initial DO concentration, the longer particles were observed above saturation due to particle stability improvement. The oxygen mass transfer rate of 0.0482 mg/L/min was found to reach a maximum at an electrolytic concentration of 0.75 g/L, beyond which the transfer rate decreased due to adsorption of negative ions of the electrolyte at the interface. High levels of turbidity caused by suspended solids have become a barrier to dissolution of NBs oxygen into the water solution, and thus affected the transfer performance. On the other hand, by applying NBs for just an hour, up to 7.2% degradation of glucose as representative organic matter was achieved. Thus, NBs technology would maintain a high DO extent for an extended duration, and thus can improve water quality provided that water chemistry is closely monitored during its application.

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Section: Effect Of Nbs On Glucose Degradationmentioning

confidence: 99%

Section: Effect Of Nbs On Glucose Degradationmentioning

confidence: 99%

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Tekile

Kim

Lee

2016

Environmental Engineering Research

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“…Though bulk nanobubbles are a relatively new field, because of their unusual longevity they are already attracting a lot of industrial attention and many potential applications have been proposed. Thus, there is immense scope for nanobubbles to impact and even revolutionise many current industrial processes such as wastewater treatment, 4 surface cleaning, [5][6][7] froth flotation, [8][9][10][11][12] nanobubbles as ultrasound contrast agent, [13][14][15][16][17][18][19] therapeutic drug delivery, 17,19,20 drag reduction, 21 sterilisation of bacteria, 22 enhanced germination rate of seeds, 23 promotion of physiological activity of living organisms, 24 improved blood oxygenation, 25 and improved engine performance using hydrogen nanobubbles. 26,27 To fully exploit these potential benefits, however, a thorough understanding of the formation, stability and dynamic behaviour of bulk nanobubbles is needed.…”

Section: Introductionmentioning

confidence: 99%

Interpreting the interfacial and colloidal stability of bulk nanobubbles

2018

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“…Chemical representation of NOM. Reproduced from Bhatnagar and Sillanpaa, (2017) with permission of the copyright holder, Elsevier 626 are carcinogenic (Vasyukova et al, 2013); (iv) because of its macromolecular size, NOM fouls membranes by forming a cake layer, thereby reducing the flux, resulting in increased energy demand and frequency of downtime for backwashing and cleaning of membranes (Ghadimkhani et al, 2016);(v) by acting as substrate for bacteria, residual NOM, known as biodegradable dissolved organic carbon (BDOC), promotes bacterial re-growth in the distribution systems -the re-growth is compounded when insufficient disinfectant residual is maintained in the distribution system (Metsamuuronen et al, 2014), and some of the bacteria are responsible for the microbial-induced corrosion of pipes in the water distribution system (Burleigh et al, 2014).…”

Section: Figurementioning

confidence: 99%

Review: Natural organic matter in aquatic systems – a South African perspective

Chaukura

Ndlangamandla

Moyo

et al. 2018

WSA

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Natural organic matter (NOM) is a complex heterogeneous mixture of humic (HS) and non-humic substances which are widespread in the aquatic environment. Other constituents are amino acids, aliphatic and aromatic hydrocarbons containing oxygen, nitrogen and hydroxyl groups. It is the combination and proportions of these motifs which give NOM its overall polarity and reactivity. Its main origins include soils, residues of fauna and flora, microbial excrements and anthropogenic faecal loads, agriculture activities and urban landscapes. Due to the different origins of the precursor material and the extent of transformation it undergoes, the composition of NOM in different water bodies varies. Characterization methods for NOM can be divided into three broad categories namely: (i) direct measuring methods, which measure the amount of organic matter in the sample; (ii) spectrometric methods, which measure the amount of radiation absorbed and or released by chromophores; and (iii) fractionation methods, which separate NOM according to size and polarity. South Africa has 6 distinct water quality regions, and each region has a unique NOM character and quantity. Existing water treatment plants do not remove NOM to levels low enough to inhibit the formation of disinfection by-products (DBPs). Currently, research is focusing more on the use of alternative techniques for NOM removal; these include advanced oxidation processes (AOPs), nanomaterials, and ceramic membranes. While NOM is well studied in other parts of the world, to the best of our knowledge, there is no state-of-the-art investigation of the occurrence and removal of NOM in South African source waters. This review aims at (i) synthesizing literature on the nature, occurrence and ecological impact of NOM, (ii) evaluating the removal of NOM in the six different water quality regions of South Africa, and (iii) suggesting novel approaches that can be used to remove NOM in South Africa.

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Ceramic membrane defouling (cleaning) by air Nano Bubbles

Cited by 131 publications

References 19 publications

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Interpreting the interfacial and colloidal stability of bulk nanobubbles

Review: Natural organic matter in aquatic systems – a South African perspective

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