Physicochemical Characterization and Estimation of the Pollution Degree of Olive Oil Mill Wastewaters from the Cold Extraction System and the Traditional System

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live oil production is widespread in Mediterranean countries such as Algeria. One of the main by-products from olive oil extraction is olive oil mill wastewater (OMW). It considers as an environmental problem for the producing countries. This study aimed to compare the physicochemical characterization and the pollution degree of OMW obtained from two different extraction systems, cold extraction system and traditional system, in Khenchela, eastern Algeria. The results of the physicochemical analyzes have shown that olive mill wastewaters from the two systems were very acidic and very rich in organic and mineral matter. There was a significant effect on electrical conductivity (EC), biological oxygen demand (BOD ), chemical oxygen demand (COD), fatty matter (FM), organic matter (OM), and polyphenols (PP). While there was no significant difference for the parameters pH, humidity (H%), dry matter (DM), total suspended solids (TSS%), and mineral matter (MM). For the two pollution indices studied, BOD 5 /COD and BI (biodegradability index), there was not a significant effect. It was recorded approximately similar values. In conclusion, the cold extraction system was the least polluting compared to the traditional extraction system. In addition, the pollution indicators clearly demonstrated the biodegradable nature of these wastewaters, for which biological remediation is appropriate.