Cultivation of olives in Chalkidiki covers an area of 31.000 ha, with 5 million trees and 19.000 producers. This is the 1/3 of the cultivated area of the county. In the region of Ormylia Chalkidiki (Sithonia) about 1.000 families cultivate 8.000 acres. Table olive production is a seasonal activity, as well as a high water-consuming procedure, therefore a significant volume of wastewater is produced within a really short time period (campaign period: September – November). Furthermore, olive processing wastewater is characterized by really high organic (5.000 – 15.000 mg COD/L) and salinity (4.000 – 12.000 μS/cm) levels. In this case, all wastewater volume is being collected in a lagoon and an integrated bacteria dosing and pumping system has been installed on-site, in a prefabricated container, particularly designed for wastewater treatment via bioaugmentation. Analytical results have proved the method high performance and applicability, as > 90% reduction of COD has been achieved in less than 7 months, following the end of the campaign period. As a result, treated wastewater characteristics complied with the specifications of a neighboring domestic sewage treatment plant where it is finally disposed.