Chemical-free scale inhibition method for seawater reverse osmosis membrane process: Air micro-nano bubbles

Dayarathne, H.N.P.; Jeong, Sanghyun; Jang, Am

doi:10.1016/j.desal.2019.03.008

Cited by 66 publications

(23 citation statements)

References 32 publications

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“…Bulk nanobubbles have diameters of less than 1 micrometer [ 13 ]. Because of their unique physico-chemical properties, nanobubbles can be used in various application fields, e.g., improvement of plant growth and productivity [ 14 ], membranes cleaning [ 15 , 16 , 17 ], waste-water treatment [ 1 , 18 , 19 , 20 , 21 , 22 ], visualization improvement as the ultrasound contrast agent [ 23 ], froth flotation [ 24 , 25 ], improvements of methane production in the anaerobic digestion [ 26 , 27 ], applications in food processing [ 28 , 29 ] and reactions with concrete using CO 2 nanobubbles [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Stability of Different Kinds of Gas Nanobubbles in Deionized and Salt Water

Zhou

Han

et al. 2021

Materials

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Nanobubbles have many potential applications depending on their types. The long-term stability of different gas nanobubbles is necessary to be studied considering their applications. In the present study, five kinds of nanobubbles (N2, O2, Ar + 8%H2, air and CO2) in deionized water and a salt aqueous solution were prepared by the hydrodynamic cavitation method. The mean size and zeta potential of the nanobubbles were measured by a light scattering system, while the pH and Eh of the nanobubble suspensions were measured as a function of time. The nanobubble stability was predicted and discussed by the total potential energies between two bubbles by the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The nanobubbles, except CO2, in deionized water showed a long-term stability for 60 days, while they were not stable in the 1 mM (milli mol/L) salt aqueous solution. During the 60 days, the bubble size gradually increased and decreased in deionized water. This size change was discussed by the Ostwald ripening effect coupled with the bubble interaction evaluated by the extended DLVO theory. On the other hand, CO2 nanobubbles in deionized water were not stable and disappeared after 5 days, while the CO2 nanobubbles in 1 mM of NaCl and CaCl2 aqueous solution became stable for 2 weeks. The floating and disappearing phenomena of nanobubbles were estimated and discussed by calculating the relationship between the terminal velocity of the floating bubble and bubble size.

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Section: Introductionmentioning

confidence: 99%

Long-Term Stability of Different Kinds of Gas Nanobubbles in Deionized and Salt Water

Zhou

Han

et al. 2021

Materials

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“…The scaling phenomenon is common in industrial production processes, such as circulating cooling water systems, oil field facilities, and pipe flow systems [1][2][3]. In most cases, the scale-forming substances are apt to appear on heat-exchange surfaces.…”

Section: Introductionmentioning

confidence: 99%

Formation and Inhibition of Calcium Carbonate Crystals under Cathodic Polarization Conditions

Sheng

Huang

et al. 2020

Crystals

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The formation of CaCO3 crystals on the cathode surface and the scale-inhibition performance of scale inhibitor 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) on the cathode surface were studied by methods of solution analysis, gravimetric analysis, SEM, FTIR, and XRD techniques. They were then compared with the results of the formation and suppression of CaCO3 crystals in aqueous solution. PBTCA had a good solution-scale-inhibition performance and good lattice-distortion effects on CaCO3 crystals in solution, which could change the CaCO3 from calcite to vaterite and aragonite crystals. The solution-scale-inhibition efficiency exceeded 97% when the PBTCA concentration reached 8 mg/L. Under cathodic polarization conditions, the surface-scale-inhibition efficiency of the cathode and solution-scale-inhibition efficiency near the cathode surface both exceed 97% at polarization potential of −1V. The addition of PBTCA significantly reduced the amount of CaCO3 crystals formed on the cathode surface and had good surface and solution-scale-inhibition effect. However, the lattice-distortion effect of PBTCA on CaCO3 crystals disappeared on the cathode surface, and the resulting CaCO3 contained only calcite crystals. The high-scale-inhibition effect of PBTCA under cathodic polarization was mainly due to the inhibition of the formation of calcium carbonate crystals by PBTCA, and not because of the lattice distortion of CaCO3 crystals.

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“…“Chemical-free technologies” have been proposed to eliminate the addition of anti-scalants. Dayarathne et al, [ 106 ] proposed an inhibitor-free method to control CaCO 3 and CaSO 4 fouling using micro/nano-sized air bubbles, which minimized CP by increasing mixing and turbulence [ 107 ]. Hou et al, [ 79 ] used a chemical-free ultrasonic irradiation method to inhibit biofouling.…”

Section: Reverse Osmosismentioning

confidence: 99%

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

et al. 2021

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Climate change, population growth, and increased industrial activities are exacerbating freshwater scarcity and leading to increased interest in desalination of saline water. Brackish water is an attractive alternative to freshwater due to its low salinity and widespread availability in many water-scarce areas. However, partial or total desalination of brackish water is essential to reach the water quality requirements for a variety of applications. Selection of appropriate technology requires knowledge and understanding of the operational principles, capabilities, and limitations of the available desalination processes. Proper combination of feedwater technology improves the energy efficiency of desalination. In this article, we focus on pressure-driven and electro-driven membrane desalination processes. We review the principles, as well as challenges and recent improvements for reverse osmosis (RO), nanofiltration (NF), electrodialysis (ED), and membrane capacitive deionization (MCDI). RO is the dominant membrane process for large-scale desalination of brackish water with higher salinity, while ED and MCDI are energy-efficient for lower salinity ranges. Selective removal of multivalent components makes NF an excellent option for water softening. Brackish water desalination with membrane processes faces a series of challenges. Membrane fouling and scaling are the common issues associated with these processes, resulting in a reduction in their water recovery and energy efficiency. To overcome such adverse effects, many efforts have been dedicated toward development of pre-treatment steps, surface modification of membranes, use of anti-scalant, and modification of operational conditions. However, the effectiveness of these approaches depends on the fouling propensity of the feed water. In addition to the fouling and scaling, each process may face other challenges depending on their state of development and maturity. This review provides recent advances in the material, architecture, and operation of these processes that can assist in the selection and design of technologies for particular applications. The active research directions to improve the performance of these processes are also identified. The review shows that technologies that are tunable and particularly efficient for partial desalination such as ED and MCDI are increasingly competitive with traditional RO processes. Development of cost-effective ion exchange membranes with high chemical and mechanical stability can further improve the economy of desalination with electro-membrane processes and advance their future applications.

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Chemical-free scale inhibition method for seawater reverse osmosis membrane process: Air micro-nano bubbles

Cited by 66 publications

References 32 publications

Long-Term Stability of Different Kinds of Gas Nanobubbles in Deionized and Salt Water

Long-Term Stability of Different Kinds of Gas Nanobubbles in Deionized and Salt Water

Formation and Inhibition of Calcium Carbonate Crystals under Cathodic Polarization Conditions

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

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