Experimental and computational analyses for induced cavitating flows in orifice plates

Cappa, Otávio Augusto Puglieri; Soeira, Thiago Vinicius Ribeiro; Simões, André Luiz Andrade; Junior, Guilherme Barbosa Lopes; Gonçalves, Julio Cesar de Souza Inácio

doi:10.1007/s43153-019-00007-8

Cited by 8 publications

(1 citation statement)

References 39 publications

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“…On the other hand, they have also shown that Venturi can produce cavitation clouds under certain pressure conditions. Cavitation clouds can reduce cavity collapse intensity and, consequently, pollutant removal efficiency (CAPPA et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Araujo

Soeira

Poleto

et al. 2020

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The presence of natural organic matter (NOM) in water does not present direct risk to the human body or to the environment. However, its presence along with other pollutants can lead to countless issues and damage human health and the environment. The hydrodynamic cavitation (HC) phenomenon started being used in the early 21st century as a process capable of treating supply-water and wastewater based on pollutant and pathogen degradation. Process effectiveness increases when it is combined to chemical agents, creating an advanced oxidation process (AOP). Although several studies have presented broaden applications for the HC process, its use for NOM removal from supply-water was not yet assessed; therefore, it remains a gap in scientific knowledge. The aim of the current study is to assess HC potential in NOM removal. In order to do so, the experiments were carried out in bench scale hydrodynamic cavitation system operated at batch model within 15-min duration period-of-time. In addition, decantation experiments (24-h period-of-time) were performed in order to check HC influence on molecules found in reaction medium after the exposure of NOM to the phenomenon. NOM was produced by a synthetic humic acid (HA) matrix at fixed concentration of 100 ppm. In total, 16 experiments were carried out; each experiment was featured by the following pair: pH (2.6, 3.0, 3.5 and 5.5) and hydrogen peroxide (0, 1, 5 and 30 mL). The best removal efficiencies (34%-36%) were observed in the most acidic pH ranges (2.6-3.0) at H2O2 concentration of 15mL. Results have presented high NOM removal efficiency (approximately 90%) after decantation at the most acidic pH ranges, as well. It can be explained by the fact that hydrodynamic cavitation in acid solution can break molecular structures suspended in the liquid medium, which favors decantation. Based on the present study, hydrodynamic cavitation with hydrogen peroxide addition can remove NOM from water; moreover, pH control is an essential factor for process development.

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Section: Introductionmentioning

confidence: 99%

Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Araujo

Soeira

Poleto

et al. 2020

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Bioactives from microalgae: A review on process intensification using hydrodynamic cavitation

Mittal

Ranade

2023

J Appl Phycol

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Microalgae are emerging as an important renewable and sustainable source of high-value biomolecules having applications in food, cosmetics, pharmaceutical, agrochemicals and fuel industries. Deriving high-value biomolecules from micro-algae however faces numerous process and technological challenges. It is essential to develop innovative ways of intensifying processes used for valorising microalgae. Hydrodynamic cavitation (HC) offers an attractive platform for process intensification relevant to microalgae because of its scalability, ability to handle dense slurries, intense physicochemical effects, and low cost. Here we briefly review the overall processes involved in deriving high-value biomolecules from micro-algae. Opportunities for intensifying these processes and enhancing productivity of processing microalgae via HC are then identified and critically reviewed. The current state of the art and yet unresolved challenges are highlighted. An attempt is made to identify specific suggestions to help direct future research efforts. The review will be useful for researchers and practitioners aiming to harness HC for deriving high-value products from microalgae.

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Application of hydrodynamic cavitation in the field of water treatment

2023

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Experimental and computational analyses for induced cavitating flows in orifice plates

Cited by 8 publications

References 39 publications

Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Removal of natural organic matter in waters using hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

Bioactives from microalgae: A review on process intensification using hydrodynamic cavitation

Application of hydrodynamic cavitation in the field of water treatment

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