Advanced Treatment of Pesticide-Containing Wastewater Using Fenton Reagent Enhanced by Microwave Electrodeless Ultraviolet

Abstract

The photo-Fenton reaction is a promising method to treat organic contaminants in water. In this paper, a Fenton reagent enhanced by microwave electrodeless ultraviolet (MWEUV/Fenton) method was proposed for advanced treatment of nonbiodegradable organic substance in pesticide-containing biotreated wastewater. MWEUV lamp was found to be more effective for chemical oxygen demand (COD) removal than commercial mercury lamps in the Fenton process. The pseudo-first order kinetic model can well describe COD removal from pesticide-containing wastewater by MWEUV/Fenton, and the apparent rate constant (k) was 0.0125 min−1. The optimal conditions for MWEUV/Fenton process were determined as initial pH of 5, Fe2+ dosage of 0.8 mmol/L, and H2O2 dosage of 100 mmol/L. Under the optimal conditions, the reaction exhibited high mineralization degrees of organics, where COD and dissolved organic carbon (DOC) concentration decreased from 183.2 mg/L to 36.9 mg/L and 43.5 mg/L to 27.8 mg/L, respectively. Three main pesticides in the wastewater, as Dimethoate, Triazophos, and Malathion, were completely removed by the MWEUV/Fenton process within 120 min. The high degree of pesticides decomposition and mineralization was proved by the detected inorganic anions.

Microwave-enhanced Mn-Fenton process for the removal of BPA in water

“…8(a), the removal rate of BPA gradually increased with the increasing energy which was brought by microwave irradiation power [45][46]. Meanwhile, both the BPA removal rate and the H 2 O 2 decomposing rate also increased [39]. The heat produced by microwave improved the rapid molecular motion and OH• production which determined the BPA removal rate [48].…”

Synthesis of nanosized amorphous and nanocrystalline TiO2 for photochemical oxidation of methomyl insecticide in aqueous media

“…Maha A. 2012; Cheng et al, 2015;Tony et al, 2015;Na et al, 2017). In order to enhance the AOPs techniques to overcome the sludge problem, a heterogeneous photocatalysis is recommended (Tony and Bedri, 2014;Premkumar et al, 2016).…”

“…In the last decade, extensive use of insecticides in a so‐called ‘Greenhouses’ as a new technology for a sustainable agriculture is gaining a great importance for out of season fruits and vegetables. Conversely, its drawback use is a huge amount of pesticide‐polluted water that disposed to the aquatic ecosystems or public sewage system leading to environmental imbalance (Kyriakopoulos et al , 2005; Mico et al , 2010; Cheng et al , 2015). Methomyl, oxime carbamate insecticide, is a highly applied insecticide for improving the agriculture yield.…”

“…Therefore, to face the extent of this wastewater pollution studies have been proposed for the treatment of wastewater contaminated with methomyl. Generally, various conventional treatment techniques have been applied such as physical, biological, adsorption or incineration pathways (Ashour et al , 2014; Carra et al , 2016; Cheng et al , 2015; Tony et al , 2018) for wastewater treatment. However, these methods are ineffective because they cause a secondary pollution by forming a sludge, cost‐inefficient need a high investment cost or unselective methods (Rahman et al , 2009; Carra et al , 2016; Tony et al , 2016).…”

تصفیه ی تکمیلی شیرابه با استفاده از فرآیند مایکروویو - فنتون به روش تحلیل تک ‌فاکتوری

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