Advanced oxidation of formaldehyde in the aqueous solutions using UVC/S2O8 2- process: Degradation and mineralization
Journal Title: Environmental Health Engineering and Management Journal - Year 2019, Vol 6, Issue 2
Abstract
Background: As a human carcinogen, formaldehyde is a toxic chemical imposing adverse effects on public health and environment. Due to its high reactivity, colorless nature, sustainability, purity in commercial forms, and low prices, the production and consumption of this compound has expanded vastly in industries. Methods: In this study, a UVC photoreactor with a total volume of 120 mL was used and operated in a rotary mode. To determine the residual concentration, high-performance liquid chromatography (HPLC) device was applied whose detector was set at a wavelength of 355 nm and equipped with C18 column (with dimensions of 25 × 4.6 mm i.d, and particle size of 5 μm). Total organic carbon (TOC) was determined using a TOC analyzer. Results: The optimal condition in this study was obtained at pH=3 and formaldehyde concentration of 350 mg, so that the removal of formaldehyde and TOC was 98.2% and 95.1%, respectively, after 35 minutes reaction time. The formaldehyde removal efficiency was assessed in the presence of methanol (MeOH), tert-butyl alcohol (TBA), and salicylic acid (SA) scavengers, and it was indicated that SO4 •- radicals were the most effective factors in formaldehyde destruction. By increasing the concentrations of MeOH, TBA, and SA to 2.5 g/L, the degradation efficiency of formaldehyde dropped from 98.02% to 69.78%, 64.68%, and 45.14%, respectively, at 35 minutes reaction time. The removal of formaldehyde in the presence of nitrate was significantly reduced and it had a significant effect on the removal of formaldehyde. Conclusion: In this study, the removal of formaldehyde was investigated in the presence of various anions including bicarbonate, carbonate, chloride, sulfate, and nitrate. According to the results, the UVC/S2O8 2- process is a convenient and cost-effective method for the removal of formaldehyde.
Authors and Affiliations
Leili Tymoyrimoghadam1 , Hossein Momeninejad2 , Parisa Baratpour3 , Fariba Gohari4 , Behnam Ravansalar2 , Mohsen Momeninejad2* , Amir Adibzadeh5
Keywords
Related Articles
- EP ID EP45470
- DOI https://doi.org/10.15171/EHEM.2019.11
- Views 350
- Downloads 0
Evaluation of acute phytotoxicity of raw leachate and landfill leachate using Sorghum bicolor seeds
Background: Leachate, a highly contaminated liquid, is produced by separating wastes and introducing moisture into the waste layers. Biological toxicity evaluation is a method that may be used to analyze the toxicity o...
Occupational exposure to metals among blacksmiths in Kano Metropolis, Nigeria
Background: Occupational workers especially those working in industries associated with metal and mining activities are excessively exposed to many toxic metals, which affect them. This study was conducted to determine...
Optimization of nitrogen and phosphorus removal from meat processing wastewaters using microalgal biofilms
Background: The conventional activated sludge processes are not able to completely treat the nitrogen and phosphorus compounds of meat processing wastewaters. Microalgal biofilm, which has the advantages of easiness and...
Evaluation of the presence of coliform in bottled drinking water, released in Sari in 2016
Background: Today, bottled water is used in many countries of the world due to its relatively low cost, better taste, ease of access and low levels of impurities. In unfavorable conditions, the maintenance of microorgani...
Estimating greenhouse gas emissions using emission factors from the Sugarcane Development Company, Ahvaz, Iran
Background: Greenhouse gas (GHG) emissions are increasing worldwide. They have harmful effects on human health, animals, and plants and play a major role in global warming and acid rain. Methods: This research investiga...