1,721,063 research outputs found
Use of microwaves for in-situ removal of pollutant compounds from solid matrices
No full textThermal treatments are the most used methods to remediate contaminated solids. However, they may seriously damage the otherwise recoverable matrices, especially when mild operating conditions cannot be used. Microwaves recently raised as a powerful tool in industrial engineering for their ability, among
other advantages, to offer a selected heating, thus allowing to treat and remove only the undesired components of a matrix. This work approaches the microwave assisted thermal treatments of waste from a physical–chemical point of view. Two recovering operations have been performed, respectively, on a soil contaminated by volatile organic compounds and on a ceramic filter spoiled by soot, using two specially designed prototypes, both realized on pre-pilot scale. The heat and mass transfer balances have then been analyzed in their more general form, and terms related to the use of microwaves outlined.
Solutions of the differential equations have been applied to interpret the effects of microwaves on rate and efficiency of the remediation processes.
doi:10.1016/j.jhazmat.2011.07.12
Analysis of Mass Transfer during Controlled Release of Diclofenac from Commercial Tablets
No full textProcessi intensificati in ambito farmaceutico: le applicazioni di potenza delle microonde
Full text linkL’interesse per le applicazioni di potenza delle microonde, cioè per il riscaldamento attuato mediante campi elettromagnetici, nel settore farmaceutico è relativamente recente e poco diffuso. Un non consolidato knowhow rende prudenti gli investimenti industriali e, sotto un profi lo più tecnico, la necessità di avere una uniforme distribuzione del calore per scongiurare elevate temperature locali nei materiali e la possibilità di un aumento incontrollato di queste costituiscono i principali fattori limitanti. La conoscenza dei meccanismi e dell’intensità delle interazioni campi elettromagnetici-materiali di interesse farmaceutico è alla base del possibile sviluppo di apparecchiature e nuovi metodi di lavorazione
A Predictive Model of Heat and Mass Transfer Phenomena in a VOC’s Contamined Soil Undergoing a Microwave Remediation.
No full textMicrowaves in Soil Remediation from VOC’s. 1. Heat and Mass Transfer Aspects.
Full text linkA novel technique presented performs in situ remediation of soils contaminated by volatile organic compounds (VOCs) based on the use of electromagnetic fields for heating operations. Attention is focused on heat and mass transfer occurring in porousmoisturized media like a soil matrix. The microwave induced steam distillation process is investigated. Measurements are reported of temperature, humidity, residual contaminant concentration, and permittivity during the process. The crucial role is elucidated that the changes of the dielectrical properties of the soil matrix play on the electromagnetic field propagation. A mathematical model of the remediation process relating all the parameters above is proposed and validated.
doi: 10.1002/aic.69049072
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