Content Vol. 4 N 3, 2018
 

Pages 36 - 49


Chemical composition and effect of olive mill wastewater on the survival and the fecundity of Eiseniafoetida (Haplotaxida, Lumbricidae, Savigny, 1826); Nahid Haouache, Aziz Bouchelta, Ahmed Boughdad, Rachid Bouabid, Karima Hannour; Inter. J. Acad. Stud; 4(3):36-49

Abstract:
Olive mill wastewater constitutes the main source of organic pollutants in Mediterranean countries known for their olive oil production. It is defined as the effluent resulting from olive oil extraction. Concern about this pollutant is strongly related to the huge amount that is produced in a very short time. This study aims to assess olive mill wastewater effects on Eisenia foetida’s survival and fecundity. The first experiment, focused on the impact of several concentrations of this wastewater, was conducted with concentrations ranging from 0 to 200 mL of the effluent / 0.726 Kg of soil. Results highlighted the high toxicity of this effluent: LT50 values vary from 0.50 to 111.39 days. The purpose of the second experiment was to evaluate the effect of a specific olive mill wastewater concentration (6 mL of the effluent / 0.726 Kg of soil) on E. foetida’s reproduction. The results of this test showed a worrying negative effect of the wastewater: the average number of cocoons per individual and the embryonic development period significantly dropped in comparison to the control (distilled water). In order to alleviate olive mill wastewater nocive effects, valorization of this effluent was discussed. 


Key words:
Olive mill wastewater, Eisenia foetida, Survival, Fecundity.

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