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Medical laboratory wastewater treatment by electro‐fenton process: Modeling and optimization using central composite design
Author(s) -
Basturk Irfan,
Varank Gamze,
Murat Hocaoglu Selda,
Yazici Guvenc Senem
Publication year - 2021
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1433
Subject(s) - central composite design , wastewater , chemical oxygen demand , response surface methodology , wastewater quality indicators , biochemical oxygen demand , pulp and paper industry , sewage treatment , chemistry , environmental science , environmental engineering , chromatography , engineering
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 BOD 5 /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, BOD 5 , and toxicity unit (TU) removal. Based on ANOVA, H 2 O 2 /COD was found to be significant parameter for COD removal, whereas current, reaction time, and H 2 O 2 /COD were determined to be significant parameters for BOD 5 and TU removal. Optimum conditions (pH value of 3.4, current 3 A, reaction time 33.9 min, and H 2 O 2 /COD of 1.29) were determined, and predicted removals of COD, BOD 5, 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 BOD 5 /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, BOD 5, 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, BOD 5, and toxicity removals were achieved under statistically optimized conditions. TU value of the wastewater decreased from the value of 163–0.815. BOD 5 /COD value increased from the value of 0.32–0.39.