Olive mill wastewater treatment using infiltration percolation in column followed by aerobic biological treatment

摘要

This work aims to treat olive mill wastewater (OMWW) by infiltration percolation in different columns containing filtrationsand, granular activated carbon, and lime, and thus followed by biological treatment using the soil microorganismsto the treatment that will give the best results. The optimum removal efficiency was obtained using granular activatedcarbon column mixed with 15% of lime with percentages removal of 39.33, 60.28, 53.17 and 88.74% for biological oxygendemand (BOD5), chemical oxygen demand (COD), polyphenols and suspended matter respectively. Aerobic treatment30 days of OMWW obtained from the column of activated carbon mixed with 15% of lime, neutralized and diluted 15times with distilled water was investigated. The results showed a significant percentage reduction of 79.78, 69.43, and60.67%, respectively, for BOD5, COD, and polyphenols. The global removal percentages after the two successive treatmentswere 87.86% for COD, 87.39% for BOD5 and 81.59% for polyphenols compounds. Fourier Transformed Infraredspectroscopy analysis of crude OMWW, infiltrated percolated and biologically treated, showed a difference between thespectra that manifests by the reduction of the spectrum intensity bands after each treatment stage, which confirmed theanalytical results. Soil microorganisms have shown their biodegradation efficiency of organic matter and polyphenolsof these much-polluted effluents under aerobic conditions. The results indicated that the pretreatment of raw olive millwastewater could be realized before biological treatment to obtain a satisfactory reduction.