Enhancement of chloroform degradation by the combination of hydrodynamic and acoustic cavitation

Franke, Marcus; Braeutigam, Patrick; Wu, Zhansheng; Ren, Yanze; Ondruschka, Bernd

doi:10.1016/j.ultsonch.2010.11.011

Cited by 47 publications

(22 citation statements)

References 29 publications

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“…Interestingly, the best results were related to the constriction that imposed the highest orifice velocity (almost three times greater than for plates B and C). The findings were consistent with the research of Franke et al [49], who noted optimal chloroform decomposition through an orifice plate with 2.8 mm in diameter. This is quite similar to plate A used in the present study.…”

Section: <Fig2>supporting

confidence: 92%

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Bis

Montusiewicz

Ozonek

et al. 2015

Ultrasonics Sonochemistry

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In this study, the application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate was investigated. Three configurations of cavitation device were examined and operational parameters of the process were selected. The study indicated that the orifice plate with a 3/10mm diameter conical concentric hole, characterized by the cavitation number of 0.033, is a reasonable choice to ensure the enhanced biodegradability of mature leachate. Using such a configuration and maintaining 30 recirculation passes through the cavitation zone at inlet pressure of 7 bar, the highest increase of biodegradability index (BI) of approximately 22% occurred, i.e., from the value of 0.046 to 0.056. The FT-IR/PAS analysis confirmed a degradation of refractory compounds that typically prevail in mature leachate. An evaluation of energy efficiency was made in terms of the actual consumed energy measured by using the Kyoritsu KEW6310 Power Quality Tester. A cavitational yield of 9.8 mg COD kJ(-1) was obtained for the optimum configuration and 30 recirculation passes. Regarding energy efficiency, the application of 10 cavitation cycles appeared to be the most profitable. This was due to an almost threefold higher cavitational yield of 27.5 mg COD kJ(-1). However, the preferable option should be selected by considering a satisfactory effect in the biodegradability enhancement.

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Section: <Fig2>supporting

confidence: 92%

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Bis

Montusiewicz

Ozonek

et al. 2015

Ultrasonics Sonochemistry

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“…the vapour pressure of the solvent) millions of cavities are generated. Recovery of static pressure in the downstream section of the cavitating device causes violent collapse of these cavities resulting into the formation of localised hot spots and highly reactive OH• and H• radicals [8]. The two key mechanisms responsible for the degradation of organic pollutants using hydrodynamic cavitation are, the thermal decomposition/ pyrolysis of organic pollutant entrapped in the cavities due to the generation of transient temperature pressure conditions (localized hot spots) and secondly, the reaction of free radicals with the organic pollutant occurring at the cavity-water interface [9].…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

Effect of process intensifying parameters on the hydrodynamic cavitation based degradation of commercial pesticide (methomyl) in the aqueous solution

Raut-Jadhav¹,

Saini

Sonawane

et al. 2016

Ultrasonics Sonochemistry

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Methomyl, a carbamate pesticide, is classified as a pesticide of category-1 toxicity and hence shows harmful effects on both human and aquatic life. In the present work, the degradation of methomyl has been studied by using hydrodynamic cavitation reactor (HC) and its combination with intensifying agents such as H2O2, fenton reagent and ozone (hybrid processes). Initially, the optimization of operating parameters such pH and inlet pressure to the cavitating device (circular venturi) has been carried out for maximizing the efficacy of hydrodynamic cavitation. Further degradation study of methomyl by the application of hybrid processes was carried out at an optimal pH of 2.5 and the optimal inlet pressure of 5 bar. Significant synergetic effect has been observed in case of all the hybrid processes studied. Synergetic coefficient of 5.8, 13.41 and 47.6 has been obtained by combining hydrodynamic cavitation with H2O2, fenton process and ozone respectively. Efficacy of individual and hybrid processes has also been obtained in terms of energy efficiency and extent of mineralization. HC+Ozone process has proved to be the most effective process having highest synergetic coefficient, energy efficiency and the extent of mineralization. The study has also encompassed the identification of intermediate by-products generated during the degradation and has proposed the probable degradation pathway. It has been conclusively established that hydrodynamic cavitation in the presence of intensifying agents can effectively be used for complete degradation of methomyl.

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“…Many studies have been reported on the combination of HC and AC to increase the efficiency of the combined processes in terms of cavitational yield. In this context, Franke et al (2011) have illustrated the use of a combination of orifice-based HC reactor and AC for the degradation of chloroform and observed a significant improvement in the degradation efficiency achieved in the combined process rather than that obtained in individual operations. This synergetic effect shows that the hybrid methods are 73% more efficient than the sum of individual operations in the degradation of chloroform.…”

Section: Summary Of Hc Process In the Area Of Wastewater Treatmentmentioning

confidence: 99%

Hydrodynamic cavitation: an advanced oxidation process for the degradation of bio-refractory pollutants

Rajoriya

Carpenter

Saharan

et al. 2016

Reviews in Chemical Engineering

106

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In recent years, water pollution has become a major problem for the environment and human health due to the industrial effluents discharged into the water bodies. Day by day, new molecules such as pesticides, dyes, and pharmaceutical drugs are being detected in the water bodies, which are bio-refractory to microorganisms. In the last two decades, scientists have tried different advanced oxidation processes (AOPs) such as Fenton, photocatalytic, hydrodynamic, acoustic cavitation processes, etc. to mineralize such complex molecules. Among these processes, hydrodynamic cavitation (HC) has emerged as a new energy-efficient technology for the treatment of various bio-refractory pollutants present in aqueous effluent. In this review, various geometrical and operating parameters of HC process have been discussed emphasizing the effect and importance of these parameters in the designing of HC reactor. The advantages of combining HC with other oxidants and AOPs such as H 2 O 2 , ozone, Fenton process, and photocatalytic process have been discussed with some recommendation for large-scale operation. It has been observed that the geometry of the HC device and other operating parameters such as operating pressure and cavitation number are the key design parameters that ultimately decide the efficacy and potentiality of HC in degrading bio-refractory pollutants on an industrial scale.

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Enhancement of chloroform degradation by the combination of hydrodynamic and acoustic cavitation

Cited by 47 publications

References 29 publications

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Application of hydrodynamic cavitation to improve the biodegradability of mature landfill leachate

Effect of process intensifying parameters on the hydrodynamic cavitation based degradation of commercial pesticide (methomyl) in the aqueous solution

Hydrodynamic cavitation: an advanced oxidation process for the degradation of bio-refractory pollutants

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