Assessment of the germination power and α-amylase activity in the soil rhizospheric compartment amended with olive mill waste waters.

Olive mill wastewater (OMWW) was used in ferti-irrigation due to its high water content, as well as its organic and mineral richness. However, this by-product also contains elevated levels of polyphenols, which may pose phytotoxic risks to soil microbiota and plants over time. To address this concern, we conducted a thorough examination of the phenolic composition of OMWW and the phenolic content of amended soils using HPLC analysis.

Phenotypic characterization for bioremediation suitability of isolates from Southern Tunisian tannery effluent.

Effluents from the leather tanning industry contain diverse pollutants, including hazardous heavy metals, posing threats to public health and the surrounding environment. Indigenous bacterial isolates can represent an eco-friendly approach for tannery wastewater treatment; however, phenotypic characterization is necessary to determine whether these strains are suitable for bioremediation. In the present study, we analyzed seven new Enterococcus faecium strains and two new Bacillus subtillis strains isolated from effluents from the Southern Tunisian Tannery (ESTT).

Biosorption of heavy metals from phosphate-processing effluent by Serratia rubidaea NCTC12971 immobilized in Ca-alginate beads.

In this study, the biosorption ability of various potentially toxic elements from phosphate-processing effluent (PPE) using the indigenous bacterium Serratia rubidaea NCTC12971 immobilized in Ca-alginate beads was investigated. The experimental data analyzed by the Langmuir isotherm revealed that the optimum dose of 2 g·100 ml of immobilized S. rubidaea NCTC12971 at pH 7 and a contact time of 48 h allowed the removal of 92.

Study of the phytotoxic potential of olive mill wastewaters on a leguminous plant 'Vicia faba L.'.

We investigated the study of the phytotoxic potential of olive mill wastewaters (OMW) on the germination and growth responses of the faba bean 'Vicia faba L.' leguminous plant cultivated under an arid Mediterranean climate. The results showed that the raw OMW blocked the germination of the seeds tested, while OMW treated soil extracts stimulate the seeds' germination rate.

Influence of biowaste compost amendment on soil organic carbon storage under arid climate.

Organic matter amendments have been proposed as a means to enhance soil carbon stocks on degraded soils, particularly under arid climate. Soil organic carbon (SOC) plays a critical role in terrestrial carbon cycling and is central to preserving soil quality. The effects of biowaste compost (BWC) on soil carbon storage were investigated.

Study of Heavy Metal Accumulation and Residual Toxicity in Soil Saturated with Phosphate Processing Wastewater.

The effects of phosphate processing wastewater (PPWW) on heavy metal accumulation in a Mediterranean soil (Tunisia, North Africa) were investigated. Moreover, the residual toxicities of PPWW-irrigated soils extracts were assessed. Results showed that heavy metal accumulation was significantly higher in PPWW-irrigated soil extracts than in control soil.

Assessment of toxicity of the untreated and treated olive mill wastewaters and soil irrigated by using microbiotests.

Hazard assessments based on two measures of toxicity were conducted for the untreated olive mill wastewaters (U), untreated olive mill wastewaters organic extract (UOE), treated olive mill wastewaters (T), treated olive mill wastewaters organic extract (TOE) and extracts of soils ferti-irrigated with untreated (SU) and with treated olive mill wastewaters (ST). The measures of toxicity were achieved by the determination of the bioluminescence inhibition percent (I(B)%) of Vibrio fischeri and by the growth inhibition (GI) of Bacillus megaterium, Pseudomonas fluorescens and Escherichia coli. A bioluminescence inhibition of V.

Polyphenols dynamics and phytotoxicity in a soil amended by olive mill wastewaters.

The effects of unprocessed olive mill wastewaters (OMW) on soil characteristics were investigated. Phenolic compounds levels in the treated soil were compared to those of a control soil profile. Results showed that OMW infiltration caused a modification of soil physicochemical characteristics.

Changes in microbial and soil properties following amendment with treated and untreated olive mill wastewater.

We investigated the effect of untreated and biologically treated olive mill wastewater (OMW) spreading on the soil characteristics and the microbial communities. The water holding capacity, the salinity and the content of total organic carbon, humus, total nitrogen, phosphate and potassium increased when the spread amounts of the treated or untreated OMW increased. The OMW treated soil exhibited significantly higher respiration compared to the control soil.