Medical laboratory wastewater treatment by electro‐fenton process: Modeling and optimization using central composite design

Abstract

Medical laboratory wastewaters arising from diagnosis and examination units show highly toxic characteristic. Within the scope of the study, removal of the wastewater’s toxicity and increasing BOD5/COD ratio of the medical laboratory wastewaters through electro‐Fenton (EF) process were investigated. In the study, central composite design was applied to optimize the process parameters of EF for COD, BOD5, and toxicity unit (TU) removal. Based on ANOVA, H2O2/COD was found to be significant parameter for COD removal, whereas current, reaction time, and H2O2/COD were determined to be significant parameters for BOD5 and TU removal. Optimum conditions (pH value of 3.4, current 3 A, reaction time 33.9 min, and H2O2/COD of 1.29) were determined, and predicted removals of COD, BOD5, and TU were found to be 55.1%, 42.5%, and 99.7% and experimental removals were found to be 53.4%, 41.2%, and 99.5%, respectively. TU value of the wastewater decreased from the value of 163–0.815, and BOD5/COD value increased from the value of 0.32–0.39. The results of the study indicate that EF process is an effective treatment option for COD, BOD5, and especially toxicity removal from medical laboratory wastewater. Practitioner points Electro‐Fenton process was applied medical laboratory wastewater with highly toxic characteristic. Response surface methodology approach using central composite design was employed for modeling. 53.4%, 41.2%, and 99.5% of COD, BOD5, and toxicity removals were achieved under statistically optimized conditions. TU value of the wastewater decreased from the value of 163–0.815. BOD5/COD value increased from the value of 0.32–0.39.

Efficient Removal of Reactive Textile Dye using Electro-Fenton Process: Response Surface Methodology Approach

“…Graphical pareto analysis is one of the tools used to see more clearly the effect of the experimental variables on the response functions. The percentage contribution of each variable to the removal efficiency and energy consumption was determined using the following Equation 11 (Basturk et al, 2021):…”

“…Designed using electrochemical principles, these processes are of great interest due to their ability to ensure environmental compatibility (Ismail et al, 2021). The electro-Fenton process, which has gained attention in recent years, is an economical and environmentally friendly process that can be used to efficiently remove toxic and/or persistent organic pollutants such as pharmaceuticals (Basturk et al, 2021, Dolatabadi and Ahmadzadeh, 2019, Liu et al, 2023, Shoorangiz et al, 2019, dyes (Cruz-González et al, 2012, Iranpour et al, 2018 and phenols (Al-Zubaidi andPak, 2020, Rahmani et al, 2015) from water.…”

Optimization of electro-Fenton process variables in terms of dye removal and energy consumption with response surface methodology

“…Increasing environmental awareness and the fact that countries have targets for environmental sustainability necessitate the efficient and environmentally friendly treatment of industrial wastewater. Electro-Fenton process, which is one of the advanced oxidation methods meeting these criteria, can be used to effectively remove toxic and/or persistent organic pollutants (Basturk et al, 2021;Dolatabadi & Ahmadzadeh, 2019;Liu et al, 2023;Shoorangiz et al, 2019), dyes Iranpour et al, 2018) and phenols (Al-Zubaidi & Pak, 2020) from water.…”

Oxytetracycline Degradation by Heat-Activated Peroxydisulfate and Peroxymonosulfate Oxidation: Optimization by Box-Behnken Design

“…Today, many advanced oxidation processes are successfully applied in many treatment facilities (Ulucan-Altuntas and Ilhan, 2018;Basturk et al, 2020;Can-Guven et al, 2020). From this viewpoint, the Fenton process is used as the most common oxidation process (Zhang et al, 2017;Han et al, 2020;Lai et al, 2020), and several authors have reported that ozone (Li et al, 2008), UV (Yan et al, 2020), photocatalytic membrane reactors (Espíndola et al, 2019) are also effective for OTC degradation.…”