Abstract
The purpose of this study was to explore and examine an advance oxidation process using ultrasonic (US)/H 2 O 2 as a potential treatment and removal of humic acid (HA). The US power, HA concentration and H 2 O 2 concentration enhanced removal process was performed by varying the irradiation time, the preliminary experiments demonstrated that natural organic matter (NOM) and HA removal was influenced by the power, HA concentration and time of sonication. The optimum conditions for HA and NOM removal were achieved by US irradiation of 110 W power, at 20 min contact time, and 20 mg.L -1 of HA concentration. Likewise, the optimum conditions for HA and NOM removal with hydrogen peroxide were obtained at 120 min time and 10A—10 -3 mol.L -1 of H 2 O 2 . The results indicated a strong capacity of sonication for NOM and HA removal, therefore by adding H 2 O 2 to the aqueous solution increased NOM and HA removal by US. The HA removal efficiency of US/H 2 O 2 (91.5%) was more than US (69.3%) and H 2 O 2 (20%). US/H 2 O 2 system proved to be the most effective. The sonochemical degradation with US/H 2 O 2 can be an efficient method to remove the NOM from aqueous solution and may be a realistic possibility for large-scale treatment.
Highlights
Natural Organic Matter (NOM) is used to describe the complex mixture of organic materials such as humic acids, hydrophilic acids, proteins, lipids, amino acids, and hydrocarbons that may be found in various sources of drinking water
The results indicated that the actual efficiency of the US system at optimal power employed for humic acid (HA) removal was 69.3%
This study showed that the degradation efficiency was strongly affected by the sonication power and reaction time
Summary
Natural Organic Matter (NOM) is used to describe the complex mixture of organic materials such as humic acids, hydrophilic acids, proteins, lipids, amino acids, and hydrocarbons that may be found in various sources of drinking water. Wide varieties of commercial chemicals are using organic compounds and resulting in generation of different types of wastewater with significant amounts of organic waste compounds. The discharge of this wastewater into existing natural bodies of water is undesirable (Wang et al, 2005; Amin et al, 2013). Advanced oxidation technologies (AOTs) are attractive alternatives for the traditional water treatments and have recently received considerable attention. These processes involve in generating hydroxyl radical (OH) as the predominant species responsible for degradating of pollutants (Song & O'Shea, 2007). A new alternative sonochemistry approach offers a solution for combating the persistent water and wastewater organic pollutants (Méndez-Arriaga et al, 2008)
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