TURK 2025

Abstract: This study was investigated the treatment of wastewater generated in the slaughterhouse of one of the largest poultry farms in Kyrgyzstan, which supplies over 60% of the country's total chicken meat and exports to foreign markets. Slaughterhouse wastewater is characterized by a high concentration of organic pollutants, resulting in a high chemical oxygen demand (COD) of approximately 6000 mg/L. This is primarily due to the presence of blood, fat, protein compounds, and other biological waste generated during poultry slaughter and initial processing.
Various treatment methods for poultry wastewater were employed in this study. The chemical coagulation (CC) process was conducted using iron (FeCl3) and aluminum suphate (Al2(SO4)3) as coagulants, facilitating the precipitation of solid particles and partial purification of the water. COD removal efficiency by CC from this wastewater were ~20-30%. With the electrocoagulation (EC) process using iron (Fe) and aluminum (Al) electrodes was also performed under process conditions of 3.0 A for 5 hours, and COD removal efficiency of this process was obtained as 40-60% for Al and Fe anodes. Then, the electrooxidation (EO) process using a boron-doped diamond (BBD) electrodes was treated, and demonstrating the highest COD efficiency under process conditions of 3.5–4.0 A for 4–5 hours. This treatment reduced the COD to 700–800 mg/L, meeting regulatory standards and significantly improving the quality of the treated water. Thus, all examined treatment methods effectively reduced wastewater contamination levels, with electrooxidation proving to be the most efficient among them.