Removal of Emerging Contaminants in Wastewater by Sonolysis, Photocatalysis and Ozonation

Abstract

<p>Three different advanced oxidation processes (AOPs) were applied to investigate the removal of emerging contaminants (ECs) i.e. sulfamethoxazole (SMX), diclofenac (DCF) and carbamazepine (CBZ) in synthetically prepared solutions. The degradation of these substances was carried out by ozonation, sonolysis and photocatalytic oxidation, as well as by different combinations of these processes. The objectives of this work were to evaluate the removal efficiency in each AOP and to assess the performance variation of sonolysis in combination with other AOPs. The best performances were achieved by sonocatalysis, which resulted in the removal of the selected pharmaceuticals in the range between 37% and 47%. Under similar experimental conditions, the removal of the selected ECs by single compounds by ozonation was slightly lower than the removal of respective compounds in the mixture. Moreover, pseudo first-order removal rate constants of photocatalytic mineralization were determined as 9.33×10-2, 4.90×10-3, 1.06×10-2 min-1 for SMX, DCF and CBZ, respectively.</p>

Fruits and vegetables are the major source of food safety issues need to overcome at household level (traditional vs. green technologies): A comparative review

“…There are always some other factors which contribute to any treatment's efficacy and similar is the case with ultrasound. These factors include: the most importantly waves specification (frequency, amplitude, and power) directly or indirectly affects the efficacy of ultrasonic treatment (Aday, Temizkan, Büyükcan, & Caner, 2013;Fraiese et al, 2018;Piyasena et al, 2003). At target intensities below 1 Wcm À2 lower energy ultrasonic waves (which is low power/low intensity) have wavelengths greater than 100 kHz.…”

“…there combined use is an innovation in food sciences. The oxidation property of ozone potentially works in an aqueous media more efficiently than in a gaseous state, which makes its function more suitable in combination with ultrasound (Aguayo et al, 2014;Fraiese et al, 2018). When both technologies applied in water media, helped each other to speed up sanitizing process efficiently and each incre- 2.…”

“…The second process is favored by ultrasound in terms of cell lysis/ organic product (microbe/chemical) degradation due to its cavitation property (Aguayo et al, 2014;Brodowska et al, 2018;Horvitz & Cantalejo, 2014). Ultrasound in aqueous media ensures speeding up oxidation the process by detaching contaminant from commodities surface or production of the cavity beneath the cell membrane and weakening its surface leads to cell lysis (Fraiese et al, 2018;Jabbar et al, 2014;Raviyan, Zhang, & Feng, 2005).…”

Photolytic and Photocatalytic Removal of a Mixture of Four Veterinary Antibiotics

“…The growing interest in VA has led to extensive studies on environmentally friendly processes which can be cost effective. Over the last few years, advanced oxidation processes (AOPs) such as ozonation [12,13], Fenton oxidation [14][15][16], electrochemical degradation [17][18][19][20], photolysis and photocatalysis [21][22][23] had been widely studied for wastewater treatment. Specially, ultraviolet (UV) irradiation has demonstrated its effectiveness for chemical oxidation and water and wastewater disinfection.…”

Impact of sonolytic ozonation (O3/US) on degradation of pesticide residues in fresh vegetables and fruits: Case study of Faisalabad, Pakistan

“…Ozone has also been used to decontaminate fresh produce in a gaseous form or in the combination with chlorine or O 3 /UV [30] , [31] , [36] . Ozone in combination with ultrasound waves (sonolysis and ozonation) has been tested to remove chemicals in wastewater [37] , [38] .Ozone microbubbles (500 ppm concentration for 10 min) has been used to decontaminate Fenitrothion in lettuce, cherry tomato and strawberry up to 33, 84 and 62 %, respectively [39] . Likewise raw cucumber when spiked in ultrasonic bath for 5, 10 and 20 min, showed significant reduction in trichlorfon (82.9 %), dimethoate (52.2 %), dichlorvos (49.8 %), fenitrothion (84.4 %) and chlorpyrifos (63.0 %) [40] with 20 min treatment.…”