Abstract
PurposeThe quantity of Olive by-products does not stop increasing and a water shortage that threatens the olive tree culture; require a serious valuation of these by-products. A comparative and valorization study of two kinds of OMW; Fresh OMW (FOMW), directly issue from three-phase continuous extraction factory and Disposal Evaporation Ponds OMW (DOMW) were done.MethodsPhysico-chemical and biological parameters of OMWs and soil irrigated with OMWs, respectively, were determined. An antibacterial activity test of FOMW against Clinic Standard Bacteria was determined. A statistical analysis was performed for all defined parameters.ResultsA significant increase of pH value of 6 and a lower failure of the EC in 8.94 (mS/cm−1) were registered after OMW disposal in evaporation ponds. We registered a fall of BOD5 and COD from 61.05–116.37 (g/L) to 55.67–103.82 (g/L), respectively. A significant increment of phenol compound removal was observed after OMW disposal. However, a switch of fatty acids distribution and content was observed, which several fermentation pathways could explain took place. This result suggested by a clear shift in biomass composition. An important soil fertility after DOMW soil irrigated was traduced by an important value of the germination index (170.55%) and efficient organic matter increment of 2.3%. A CMI rate of 32.76 (μg mL−1) was determined by FOMW against different clinic standard bacteria.ConclusionA spectacular soil fertility effect was obtained from DOMW soil spreading, that efficiently evaluate the OMW biological treatment. In addition, the FOMW was valorized as its powerful antibacterial.
Highlights
IntroductionOlive oil production industry release large quantities of olive mill wastewater (OMW)
Every year, olive oil production industry release large quantities of olive mill wastewater (OMW)
Test Student was determined with Fresh OMW (FOMW) and Disposal Evaporation Ponds OMW (DOMW) (p = 0.01, *p < 0.05)
Summary
Olive oil production industry release large quantities of olive mill wastewater (OMW). They are estimated approximately 30 million m3 in the world and 700 million m3 in Tunisia (Mekki et al 2013). They are obtained from olive tree after discontinuous press or from the continuous centrifugation Different factors influence the characteristics of OMW such as the method of extraction, the technological process separation, the climatic conditions and the variety and the fruit maturity of olive tree (Dermeche et al 2013; Aggoun et al 2016). After oil extraction, OMW contained 98% of the total phenolic content of the olive fruits with concentration varying from 0.5 to 24 g/l (Paraskeva and Diamadopoulos 2006; Alaoui et al 2016; Leouifoudi et al 2014)
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