Slaughterhouse Wastewater Treatment by Integrated Chemical Coagulation and Electro-Fenton Processes

Edris Bazrafshan, Hamid Reza Zakeri, Melissa Gurgel Adeodato Vieira, Zahra Derakhshan, Leili Mohammadi (), Amin Mohammadpour () and Amin Mousavi Khaneghah
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Edris Bazrafshan: Health Sciences Research Center, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh 33787-95196, Iran
Hamid Reza Zakeri: Master of Environmental Health, Zahedan University of Medical Sciences, Zahedan 98167-43463, Iran
Melissa Gurgel Adeodato Vieira: School of Chemical Engineering, University of Campinas, Campinas 13083-970, SP, Brazil
Zahra Derakhshan: Research Center for Health Sciences, Department of Environmental Health, School of Health, Shiraz University of Medical Sciences, Shiraz 71536-75541, Iran
Leili Mohammadi: Environmental Health, Infectious Diseases and Tropical Medicine Research Center, Research Institute of Cellular and Molecular Sciences in Infectious Diseases, Zahedan University of Medical Sciences, Zahedan 98167-43463, Iran
Amin Mohammadpour: Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71946-84636, Iran
Amin Mousavi Khaneghah: Department of Fruit and Vegetable Product Technology, Wacław Dąbrowski Institute of Agricultural and Food Biotechnology—State Research Institute, 36 Rakowiecka St., 02-532 Warsaw, Poland

Sustainability, 2022, vol. 14, issue 18, 1-15

Abstract: The slaughterhouse industry produces large amounts of highly polluted wastewater which needs to be treated before being discharged water. Thus, this work was conducted to investigate the feasibility of treating slaughterhouse wastewater using combined chemical coagulation and electro-Fenton methods. We studied the effect of process parameters such as polyaluminum chloride (PAC) concentration (25, 50, 75, 100 mg/L) for chemical coagulation and hydrogen peroxide concentration (500, 1000, 1500, 2000, 2500, 3000, 4000 mg/L), the pH of the solution (3, 5, 7, 10), and the reaction time (5, 10, 15, 30, 45, 75, 120 min) and the voltage (10, 20, 30, 40 V) on the removal of chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), total Kjeldahl nitrogen (TKN), and fecal coliforms (FC). The optimum removal efficiency for the electro-Fenton process was obtained at PAC = 75 mg/L, reaction time = 75 min, pH = 3, H 2 O 2 = 2500 mg/L, and V = 20 V, which resulted in the removal efficiency of 89.55% for COD, 88.88% for BOD, 91.27% for TSS, 69.23% for TKN, and 100% for FC. The findings demonstrated that combined chemical coagulation and electro-Fenton processes effectively and efficiently treat slaughterhouse wastewater. The results of this research can be used by competent authorities to increase the efficiency of slaughterhouse wastewater treatment and to protect the environment.

Keywords: combined methods; polyaluminum chloride; hydrogen peroxide; removal; slaughterhouse wastewater (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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