The Compost of Olive Mill Pomace: From a Waste to a Resource - Environmental Benefits of Its Application in Olive Oil Groves

Gómez‐Muñoz, Beatriz; Hatch, D. J.; Bol, Roland; García‐Ruiz, Roberto

doi:10.5772/48244

Cited by 25 publications

(27 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Further, the great loss of the soluble compounds, which occurs during the composting process of the olive mill wastes, generally produces a material rich in hydrophobic compounds, which enhance the chemical recalcitrance of the organic material (Piccolo et al, 1999; Brunetti et al, 2005; Doerr et al, 2005; Lorenz et al, 2007). The presence of recalcitrant compounds in the C-SOMW+P should contribute to the reduced mineralisation rate of C and its high residence time in soil (Gómez-Muñoz et al, 2012). In an 8-months incubation experiment where composted OMW (60–80% OMW, 10–20% olive leaf material, 10–40% poultry or sheep manure) was mixed with eight different soils, Gómez-Muñoz et al (2012) found that less than 10% of the C was mineralised, independent of the soil characteristics.…”

Section: Discussionmentioning

confidence: 99%

Long Term Amendment with Fresh and Composted Solid Olive Mill Waste on Olive Grove Affects Carbon Sequestration by Prunings, Fruits, and Soil

et al. 2017

View full text Add to dashboard Cite

The soil amendment with organic wastes represents a way to increase the soil fertility and the organic carbon (C) stored in the agro-ecosystems. Among the organic waste materials produced by agricultural and industrial activities, olive mill wastes derived from the olive oil extraction process may represent a suitable soil amendment. The aim of the study was to evaluate the effect of fresh (SOMW) or composted mixture of SOMW and shredded olive tree prunings (C-SOMW+P) on the vegetative and productive activities of olive trees, on the C stored in the tree non-permanent structures (prunings and fruits) and in the soil. The plots treated with SOMW or C-SOMW+P showed higher vegetative and productive activities than the untreated plots, and this was attributed to the higher total N and availability of P and K supplied by the amendments. Consequently, treatments increased the C sequestered in the tree non-permanent structures than in the control trees. However, no significant different effect between SOMW and C-SOMW+P treatments was found for the C stored in prunings and fruits, whereas it was evident a stronger influence of C-SOMW+P than SOMW on soil C sequestration. Indeed, about 50% the C supplied by the treatment with C-SOMW+P was sequestered in the olive grove system, with more than 90% of the sequestered C stored into the soil. The low amount of C sequestered in the soil following the addition of SOMW was attributed to its richness of moisture and easily degradable compounds that triggered the mineralization processes controlled by the soil microbial community. Although the 8 years of amendment produced a higher fruit yields than the control, no difference occurred between the characteristics and the oil content of the olive fruits. Only the total phenol content for the oil obtained from the SOMW-treated plots was significantly higher. The other considered fruit characteristics did not show significant differences.

show abstract

Section: Discussionmentioning

confidence: 99%

Long Term Amendment with Fresh and Composted Solid Olive Mill Waste on Olive Grove Affects Carbon Sequestration by Prunings, Fruits, and Soil

et al. 2017

View full text Add to dashboard Cite

show abstract

“…These Jift samples were kept in a refrigerator at a temperature of 4˚C in order to be used for isolating thermophiles. Fresh Jift is made mainly with water, seed, and pulp [29]. The Jift exhibits similar damages of OMW to the environment.…”

Section: Omw and Jift Usedmentioning

confidence: 99%

Biodegradation of olive mills wastewater using thermophilic bacteria

Al-Qodah

Al-Shannag

Bani‐Melhem

et al. 2014

Desalination and Water Treatment

View full text Add to dashboard Cite

2014): Biodegradation of olive mills wastewater using thermophilic bacteria, Desalination and Water Treatment, A B S T R A C TBiodegradation of olive mill wastewater (OMW) toxic constituents was investigated using thermophilic bacteria. Three types of thermophilic bacteria were isolated from olive mills solid waste (Jift) and tested their ability to detoxify OMW. These thermophiles, namely Bacillus polymaxa JT6, Bacillus Maceramns JT7 and Bacillus popilliae JT8, can grow on Zebar as a main carbon source. The optimal growths of thermophiles were obtained at temperature of 65˚C and pH of 6.4. The growth of the three thermophiles on Zebar was descending with increasing Zebar concentration. Complete inhibition of thermophiles was observed when the total solid concentration of Zebar was above 20 g/L. This suggests the need for a pretreatment process for Zebar prior to the biological treatment or the use of diluted Zebar solution. Moreover, the growth rate of the thermophiles on Zebar solution of 8 mass% was described by Monod growth model.

show abstract

“…Olive mill pomace (OMP) is a semi-solid to semi-liquid byproduct with phytotoxic and antimicrobial properties, low pH, relatively high salinity and organic load, and rich in phenolic constituents (Gómez-Muñoz et al, 2012;Linares et al, 2003;Piotrowska et al, 2011;Sierra et al, 2007). Potentially harmful for the environment, as the average oil content of olive fruits is about 20% by weight, the remaining 80% of the fruit together with the added water forms the olive pomace, which still includes a small and variable proportion of residual oil (de la Casa and Castro, 2014).…”

Section: Olive Mill Pomacementioning

confidence: 99%