Efects of olive mill wastewater and olive mill pomace on soil physicochemical properties and soil polyphenols
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Date
2022-05-28
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Material Cycles and Waste Management
Abstract
Every year, worldwide olive oil extraction processes produce huge amounts of by-products such as (olive mill wastewater
and olive mill pomace) in a short period of time. These products are a major problem that afects the soil. Therefore, the aim
of this study was to investigate the single and simultaneous efects of diferent olive mill wastes and to determine phenolic
compounds in soil using (FTIR) spectroscopy. Under laboratory conditions, increasing doses (12.5%, 25%, 50%, 75%, and
100% w/w) of olive mill wastewater (OMWW), olive mill pomace (OMP), and combinations thereof were applied to the soil.
A non-signiicant decrease in soil pH was found, after treatment with olive mill wastewater (OMWW), while a signiicant
decrease was measured after treatment with OMP and the combination of both. Moreover, treatment with OMWW, OMP,
and their combination at relatively high doses signiicantly increased the values of electrical conductivity (EC), organic
matter (OM), organic carbon (OC), and phenolic compounds (PP). At low doses, including the legally permissible doses
(50 m
3
ha
−1
y
−1
for OMWW and 50–80 t
−1
ha
−1
y
−1
for OMP), no signiicant efects were observed on total nitrogen (TN)
and assimilable phosphorus (P) in the soil. The FTIR results show that OMWW and OMP have a high content of phenolic
compounds. In addition, FTIR analysis provided valuable information on soil components after treatment with OMWW,
OMP, and their combination. The overall results show that OMWW and OMP can be considered as helpful amendments
and cost-efective fertilizers to improve soil quality.