1 research outputs found
Changes in Phenolic Compounds and Phytotoxicity of the Spanish-Style Green Olive Processing Wastewaters by Aspergillus niger B60
This
study systematically investigated the degradation kinetics
and changes in the composition of phenolic compounds in Spanish-style
Chalkidiki green olive processing wastewaters (TOPWs) during treatment
using Aspergillus niger B60. The fungal
growth and phenol degradation kinetics were described sufficiently
by the Logistic and Edward models, respectively. The maximum specific
growth rate (2.626 1/d) and the maximum degradation rate (0.690 1/h)
were observed at 1500 mg/L of total polar phenols, indicating the
applicability of the process in TOPWs with a high concentration of
phenolic compounds. Hydroxytyrosol and the other simple phenols were
depleted after 3–8 days. The newly formed secoiridoid derivatives
identified by HPLC-DAD-FLD and LC-MS are likely produced by oleoside
and oleuropein aglycon via the action of fungal β-glucosidase
and esterase. The treated streams were found to be less phytotoxic
with reduced chemical oxygen demand by up to 76%. Findings will provide
useful information for the subsequent treatment of residual contaminants