Soft drink industry wastewater treatment in microwave photocatalytic system – Exploration of removal efficiency and degradation mechanism

Remya, Neelancherry; Swain, Anil

doi:10.1016/j.seppur.2018.08.051

Cited by 33 publications

(6 citation statements)

References 24 publications

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“…SO 4 •– is typically generated from persulfate (PS, S 2 O 8 2– ). Due to the excellent stability of PS, it can be activated in various ways, including heat, microwave irradiation, , ultrasonication, and transition metals . Meanwhile, PS stably exists in the matrixes until it is activated for in situ chemical oxidation …”

Section: Introductionmentioning

confidence: 99%

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Shen

Zhang

et al. 2021

ACS Omega

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Since traditional methods for removing volatile organic compounds (VOCs) from wood consume large amounts of energy and generate environmental pollution, it is desired to develop a convenient and green treatment method. Oxidation by microwave-activated persulfate (MW-PS) is a promising alternative method that has been used to eliminate VOCs from wood. The penetration of microwave energy can destroy the wood pit membranes and increase VOC emissions. The VOCs are further degraded by •OH and SO 4•− , which are generated via the activation of microwaves. This phenomenon can be detected by the electron paramagnetic resonance spectrometry. The 35 types of main VOCs of natural wood were determined, including alkanes/ terpenes, alcohols/ethers, esters, aldehydes/ketones, and others. In the MW-PS system, 23 compounds were removed with an efficiency of 100%. Specifically, as one of the major compounds, the content of alkanes/terpenes was sharply decreased, and no alcohols/ethers and esters were detected. It was found that the optimal conditions of the MW-PS system for the minimum release of VOCs from wood were the microwave power of 462 W, irradiation time of 30 min, and PS dosage of 0.5 mmol/L.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Shen

Zhang

et al. 2021

ACS Omega

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“…However, to our knowledge, all of the studies so far depended on the use of an EDL as the source of UV irradiation, what makes it impossible to assess the role of MW in the UV(EDL)/H 2 O 2 /MW process (FERRARI et al, 2009;CHEN et al, 2011;REMYA and SWAIN, 2019). This paper proposes a novel reactional setup for the UV/H 2 O 2 /MW process with no EDL as the UV source, allowing for inferring the existence of MW non-thermal effects.…”

Section: Introductionmentioning

confidence: 99%

Optimized Degradation of Bisphenol A by UV/H2O2 coupled to Microwaves in a Novel Reactional Setup

Barrenha¹,

Azevedo²

2021

Preprint

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In this paper, the UV/H2O2/MW (microwave) process was compared with the UV/H2O2 one, using bisphenol A (BPA) as a model-pollutant. The proposed experimental setup was operated in batch recycle mode and allows for the direct comparison among different processes: UV only, H2O2 only, MW only, UV/H2O2, UV/MW, H2O2/MW, and UV/H2O2/MW, as well as temperature control to minimize thermal effects. The degradation of BPA at near-environmental concentration (100 µg L−1) was optimized by an experimental design approach (Response Surface Methodology) and its residual concentration was measured by HPLC. Approximately 95% of the initial BPA amount could be removed in 30 min at the optimal conditions (CH2O2 = 20 mg L−1, flow rate = 700 mL min−1, and MW power = 245 W). The experiments designed for comparing the UV/H2O2 and the UV/H2O2/MW processes showed that the use of MW doubled the initial pseudo-first-order degradation rate (from 0.046 to 0.10 min−1) and significantly increased the maximum oxidation capacity of the system (from 86 to 100%). Although the reasons behind those results are still unclear, it seems that the existence of non-thermal effects of the MW irradiation should be considered.

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“…The coupled system eliminated COD by 85 %, biochemical oxygen demand (BOD) by 75 %, and, simultaneously, reduced the operating costs and residence time [9]. Other types of AOPs, such as photolytic and photocatalytic treatments in presence of microwaves [10], photo-Fenton degradation [11], and solar-photo-Fenton treatment [12], have also proven to be effective in the decontamination of beverage industry wastewater.…”

Section: Introductionmentioning

confidence: 99%

Optimization of electro-Fenton oxidation of carbonated soft drink industry wastewater using response surface methodology

Davarnejad

Azizi

Joodaki

et al. 2020

Maced. J. Chem. Chem. Eng.

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The immense volume of highly polluted organic wastewater continuously generated in the beverage industry urges the design of new types of wastewater treatment plants. This study aimed to evaluate the applicability of the electro-Fenton (EF) technique to reduce organic pollution of real effluent from a carbonated soft drink factory. The impact of various process variables like pH, time, current density, H2O2/Fe2+ molar ratio, and the volume ratio of H2O2/soft drink wastewater (SDW) was analyzed using response surface methodology (RSM). The observed responses were in good agreement with predicted values obtained through optimization. The optimum conditions showed a chemical oxygen demand (COD) removal efficiency of 73.07 %, pH of 4.14, time of 41.55 min, current density of 46.12 mA/cm2, H2O2/Fe2+ molar ratio of 0.9802, and H2O2/SDW volume fraction of 2.74 ml/l. The EF process was able to effectively diminish the organic pollution, reduce the residence time and, therefore, the operating costs.

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Soft drink industry wastewater treatment in microwave photocatalytic system – Exploration of removal efficiency and degradation mechanism

Cited by 33 publications

References 24 publications

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Enhancement of Removal of VOCs and Odors from Wood by Microwave-Activated Persulfate

Optimized Degradation of Bisphenol A by UV/H2O2 coupled to Microwaves in a Novel Reactional Setup

Optimization of electro-Fenton oxidation of carbonated soft drink industry wastewater using response surface methodology

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