Microflora evaluation of two agro-industrial effluents treated by the JACTO jet-loop type reactor system

Abstract

Jet-loop type reactors developed in our group have been successfully used for biological treatment of winery and olive oil wastewaters. The objective of the present work was to study the influence of the reactor hydrodynamics, causing high shear stress applied on the nozzle and its influence on the composition of the microbial population. Winery and olive oil industry effluents were treated and analysed. Microbial consortia were enriched and selected under different bio-treatment conditions of the effluents. In the case of the winery wastewaters, the isolates identified belong to the genera of Pseudomonas and Bacillus. Saccharomyces cerevisiae was also present in the consortia but no filamentous fungi were detected. In the case of the olive oil wastewaters, Bacillus megaterium 2 was the predominant microorganism. It was not detected any type of fungi.

Olive oil history, production and by-product management

“…However, it has been proved efficient even at higher loading rates. Eusebio et al (2005) achieved about a 70% COD reduction for a loading rate of 40 g/l at a hydraulic retention time of 3 days. In fact, higher concentrations can only be tolerated if the plant operates at a long hydraulic retention time and/or with high recycle ratios (i.e., high flow rates of the treated effluent are recycled back to the inlet of the plant).…”

A Methodological Proposal For Corporate Carbon Footprint And Its Application To A Wine-producing Company In Galicia, Spain

“…This system achieves COD removal efficiency near 90%. Though, the high shear stress applied on the Venturi influence the composition of the microbial population (Petruccioli et al, 2000;Eusébio et al, 2005) leading to settling sludge problems. A similar technology that utilizes also a Venturi injector is the AMBB.…”

“…A deep understanding on the microbial population involved in the process is crucial to address any strategy for treatment system management (Tandoi et al, 2006). Although some researchers have been developed (Eusébio et al, 2004;Eusébio et al, 2005;Jourjon et al, 2005), the understanding of the microflora dynamics inside the bioreactor will be of utmost importance for the treatment system optimisation. Moreover, in the aerobic bioreactors the microorganisms are dependent on aeration oxygen supply.…”

The influence of agro-industrial effluents on River Nile pollution

“…and Pseudomonas spp. for winery and olive oil waste waters [10] and Ps. fluorescens for pulp and paper mills' effluents [11].…”