Biodegradation of organic compounds and decrease in electrical conductivity by native consortium in effluents from the olive industry

Purpose Effluents from machined olive waters are highly polluting. These have high organic load values such as the biological demand of oxygen and the chemical demand of oxygen, salinity, and others, which far exceed current regulations. The objective of this work was to achieve, through bioremediation by native microorganisms, the reduction of effluent contamination.Method Bioremediation was achieved by supplementing the effluent with a source of carbon, nitrogen, and phosphorus in the approximate ratio ۱۰۰: ۵: ۱, under aerobic conditions at room temperature (۲۵ ± ۱ °C) for a period of ۷ to ۱۴ days.Results The consortium of microorganisms (bacteria and yeasts) was identified as: Pseudomonas aeruginosa strain Kasamber ۱۱, Pseudomonas aeruginosa strain ۱۸۱۶, Klebsiella sp. strain DE۰۰۴, Enterobacter sp. DKU NT ۰۱, Pseudomonas sp. KC۳۱, Bacillus sp. MG۰۶, Candida thaimueangensis NWP۲-۱, Klebsiella sp. SI-AL-۱B, Bacillus pumilus strain LX۱۱, Bacillus sp. B۹ (۲۰۱۵b), Bacillus pumilus strain Y۷, Planomicrobium sp. strain MSSA-۱۰ ۱۶S, Candida thaimueangensis strain S۰۴-۲.۲ and one microorganism without identification. A reduction of approximately ۴۰-۸۰% of specific parameters and contamination indicators such as biological oxygen demand (BOD۵), chemical oxygen demand (COD) and electrical conductivity was achieved.Conclusion The microbial consortium achieved the reduction of the original contamination of the effluent from "mechanized olives" by biostimulation, transforming it into a less contaminated liquid that could be used for other uses or destinations.

Keywords:

Machined Olive Waters , Bioremediation , Native Microorganisms , Effluent Introduction