Degradation of organic pollutants from wastewater using hydrodynamic cavitation: A review

Mohod, Ashish V.; Teixeira, Antônio Carlos Silva Costa; Bagal, Manisha V.; Gogate, Parag R.; Giudici, Reinaldo

doi:10.1016/j.jece.2023.109773

Cited by 31 publications

(14 citation statements)

References 113 publications

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“…It has been also observed that with an increase in flow rate, and hence in the velocity of the fluid through the orifice, the cavitation number decreases. Literature reports on the variation of bubble radius distribution with time for various cavitation numbers indicate that smaller values of cavitation number (below 1) improved the desired chemical effect (i.e., increased the generation of oxidizing radicals) due to the increasing pressures generated by the cavitational collapse (Mohod et al, 2023).…”

Section: Cavitation Numbermentioning

confidence: 99%

“…Adsorption processes (with activated carbon), in turn, are not suitable due to the formation of dioxins and furans after activated carbon disposal from incineration (Pardeshi & Patil, 2008b). While biological treatment techniques usually take a long treatment time, and need suitable temperature and pH conditions (Mohod et al, 2023). On this basis, advanced oxidation processes (AOPs) have appeared as promising wastewater treatment technologies for degrading toxic compounds such as dyes, chemicals, pesticides, polymers, surfactants, and pharmaceuticals (Bagal & Gogate, 2012;Pawar et al, 2014).…”

Section: Phenol Is An Organic Compound Widely Used In Medical Applica...mentioning

confidence: 99%

“…Among AOPs, cavitation has two important advantages because it does not require reactants or UV light: (i) lower operation costs; (ii) limited by-products, avoiding some (Hanafi & Sapawe, 2020;Li et al, 2015;Zhao et al, 2014) dangerous oxidants such as chlorine (Benito et al, 2005). Cavitation refers to the nucleation, growth, and implosion of vapor-bubble cavities (Bagal et al, 2023). Cavities produced in the solution either by acoustic (ultrasound) or hydrodynamic (tension in the liquid) generate highly reactive free radicals, which are essential feed to oxidize organic chemicals (Hanafi & Sapawe, 2020;Li et al, 2015;Zhao et al, 2014).…”

Section: Phenol Is An Organic Compound Widely Used In Medical Applica...mentioning

confidence: 99%

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Phenol degradation using combined effects of hydrodynamic cavitation and oxidant: Doehlert matrix

Mohod

Palharim

Ramos

et al. 2023

Environmental Quality Mgmt

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Hydrodynamic cavitation (HC)‐based treatments have been proposed for the degradation of phenol as a toxic pollutant. The present work aimed to optimize the degradation of phenol using HC by means of Doehlert experimental design, which has not been previously addressed. Initially, operational parameters of hydraulic characteristics of the pump, inlet pressure, solution pH, and initial concentration were optimized; later, the effects of pH solution and H2O2 loading or initial pollutant concentration on phenol degradation were explored using the Doehlert experimental design. It was observed that phenol degradation is strongly dependent on the pH of the solution. Also, the acidic condition favors the formation of hydroxyl radicals and thus, the degradation of phenol. Based on the Doehlert matrix, the 94.1% phenol degradation and 68.60% total organic carbon (TOC) were obtained in 180 min at 304.5 mg/L of hydrogen peroxide at an initial concentration of 20 mg/L, 2.0 pH, and 90 psi inlet pressure, providing a cavitational yield of 6.33 × 10−6 mg/J and minimum treatment cost of US$/L 0.13. Overall, it has been observed that HC can be a promising route for the removal of pollutants (phenol) effectively using hydrogen peroxide as an additive.

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Section: Cavitation Numbermentioning

confidence: 99%

Section: Phenol Is An Organic Compound Widely Used In Medical Applica...mentioning

confidence: 99%

Section: Phenol Is An Organic Compound Widely Used In Medical Applica...mentioning

confidence: 99%

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Phenol degradation using combined effects of hydrodynamic cavitation and oxidant: Doehlert matrix

Mohod

Palharim

Ramos

et al. 2023

Environmental Quality Mgmt

Self Cite

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“…This effect is particularly observable in the case of high molecular weight compounds or multi-component mixtures [24]. The main factors determining which mechanism is decisive are the properties of the compound, the intensity of cavitation and the construction of the HC reactor [25]. In this study, an orifice plate with one concentric hole was employed.…”

Section: Influence Of Hd On the Physicochemical Properties Of Pre-tre...mentioning

confidence: 99%

Pre-Treatment of Spent Coffee Grounds Using Hydrodynamic Cavitation

Szaja,

Montusiewicz,

Pasieczna-Patkowska

et al. 2024

Energies

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Spent coffee grounds (SCGs) constitute the main solid residue of the coffee brewing process. SCGs are generated in significant amounts daily, worldwide. The effective management of this waste through biological processes is still an unresolved problem. In this study, the application of hydrodynamic cavitation (HC) as a pre-treatment method for improving the biodegradability of SCGs suspended in municipal wastewater was proposed. An orifice plate with a conical concentric hole having inlet/outlet diameter of 3/10 mm was applied as the cavitation inducer. Three inlet pressures were chosen: 3, 5 and 7 bar. The effects in time intervals of 0, 5, 10, 20, 30 and 45 min were evaluated. The application of HC led to enhanced biodegradability for each case. The results of multi-criteria decision indicated that the most efficient combination in terms of biodegradability and energy usage was obtained at the pressure of 5 bar and duration of 20 or 30 min, depending on the adopted weights. The improvements of DOC/TOC (dissolved organic carbon/total organic carbon) ratio were 57% and 71%, as compared to the untreated samples. The release of caffeine was found at pressures of 5 and 7 bar. However, at 5 bar, this effect was noticed for the longest times, 30 and 45 min, respectively.

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“…It is generated by cavitation, which creates low gas pressure, depending on the saturated vapor pressure, and is ideal for the generation of discharge plasma. In a hydrodynamic cavitation device based on the Venturi water jet principle, the water volume decreases at the throat section, and the flow velocity and pressure increase sharply [33] , [34] , [35] . As a result, a large number of tiny cavitation bubbles are produced in the water body when the pressure drops below the saturated vapor pressure.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous hydrodynamic cavitation and nanosecond pulse discharge plasma enhanced by oxygen injection

Luo

Wang

et al. 2023

Ultrasonics Sonochemistry

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Degradation of organic pollutants from wastewater using hydrodynamic cavitation: A review

Cited by 31 publications

References 113 publications

Phenol degradation using combined effects of hydrodynamic cavitation and oxidant: Doehlert matrix

Phenol degradation using combined effects of hydrodynamic cavitation and oxidant: Doehlert matrix

Pre-Treatment of Spent Coffee Grounds Using Hydrodynamic Cavitation

Simultaneous hydrodynamic cavitation and nanosecond pulse discharge plasma enhanced by oxygen injection

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