The effect of biological treatment methods on the concentration of carbonaceous pollutants in the slaughterhouse wastewater: A systematic review

Abstract

The systematic review conducted in this study aimed to investigate the effect of biological methods of slaughterhouse wastewater treatment (SWWT) on reducing carbonaceous pollution concentration in the effluent. The researchers performed a comprehensive search for relevant articles in databases such as Scopus, PubMed, Web of Science, and Embase, focusing on studies published up to January 2022. After screening the retrieved records, the researchers identified 71 relevant articles that contained data on the removal efficiency of carbonaceous pollutants in slaughterhouse wastewater. These pollutants included total chemical oxygen demand, chemical oxygen demand, soluble chemical oxygen demand, biochemical oxygen demand, five-day biochemical oxygen demand, organic material, soluble organic compounds, and total organic carbon. The results of the qualitative synthesis indicated that certain SWWT methods exhibited higher removal efficiencies for carbonaceous pollutants. These methods were characterized by long hydraulic retention times, the use of polymeric filter media, attached growth processes, and operation at maximum organic loading rates. It's important to note that specific details regarding the individual studies and their findings are not provided in the given information. However, the systematic review suggests that certain biological treatment methods can effectively reduce carbonaceous pollution concentrations in slaughterhouse wastewater.