Tag Archives: olive pomace

913-937 A. Doughmi, F. Benradi, E. Cherkaoui, M. Khamar1, A. Nounah and A. Zouahri
Fertilizing power evaluation of different mixtures of organic household waste and olive pomace
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Fertilizing power evaluation of different mixtures of organic household waste and olive pomace

A. Doughmi¹*, F. Benradi¹, E. Cherkaoui¹, M. Khamar¹1, A. Nounah¹ and A. Zouahri²

¹Mohammed V University, High School of Technology, Civil Engineering and Environment Laboratory (LGCE), Materials Water and Environment team, MA11060 Sale, Morocco
²INRA, Regional Center for Agricultural Research in Rabat, Research Unit on Environment and Natural Resource Conservation, MA10112 Rabat, Morocco
*Correspondence: ayoub_doughmi@um5.ac.ma

Abstract:

From the perspective of sustainable agriculture established by the Green Morocco Plan, it is interesting to direct research more towards the agronomic valorization of olive pomace, to give birth to a clean olive growing which leads to a viable economy thus respecting a pillar of sustainable development. Several studies have shown the effectiveness of using olive pomace as a soil amendment. Therefore, in this study we want to increase the agricultural performance of olive pomace by composting by mixing it with other waste.

Morocco is considered one of the major olive-producing countries with an annual production of 1.41 million tonnes (MT), part of it is dedicated to olive oil production. Morocco produces approximately 26.8 MT of waste annually, 8.3 MT are household waste, 70% are organic household waste (5.8 MT). The current production of organic household waste in urban areas is estimated at 4.8 million tonnes per year, or an average of 0.76 kg hab^-1 day^-1, and in rural areas 1 million tonnes per year, or an average of 0.30 kg hab^-1 day^-1 (SNRVD, 2015). Agri-food industry waste is around 3 million tonnes with 600,000 to 700,000 tonnes of olive oil waste (pomace) (Agricultural Development Agency, 2018). The rejection of this waste without any prior treatment contributes to the environment deterioration. However, a large part of this waste remains recoverable, which would reduce both waste volume to be eliminated and the associated management cost. This; will contribute to reducing the negative impacts on receiving environments and the cost of restoring the environment state, and ensuring a transition towards a circular economy.Our work is part of the context of solid waste management and recovery, in particular organic waste from household and food-processing activities, and is oriented towards the pomace recovery by composting, mixing it with different percentages of organic household waste.

This work consists on composting olive pomace from the three phases system with another structural agent (organic household waste). Comparing the mixtures (6 treatments) with different concentrations in terms of composting process parameters (pH, electrical conductivity, organic matter temperature, etc.), organic matter evolution and composts quality, with manual aeration of the compost, in order to increase the agricultural yield of the olive pomace. Residues from the fermentation process can be used in agriculture. All the different mixtures of the different percentages are characterized at the initial state and at the end of the composting process in order to highlight their nutritional values.

Key words:

compost, olive pomace, organic household waste, physico-chimical and bacteriological characterization

1444–1454 L. Regni#, D. Pezzolla#, G. Gigliotti and P. Proietti
The sustainable reuse of compost from a new type of olive mill pomace in replacing peat for potted olive tree
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The sustainable reuse of compost from a new type of olive mill pomace in replacing peat for potted olive tree

L. Regni¹#*, D. Pezzolla²#*, G. Gigliotti² and P. Proietti¹

¹Department of Agricultural, Food and Environmental Sciences, University of Perugia, via Borgo XX Giugno, 74, IT06121 Perugia, Italy
²Department of Civil and Environmental Engineering, University of Perugia, via G. Duranti 93, IT06125 Perugia, Italy
#these authors contributed equally to the work
*Correspondence: regni.luca.agr@gmail.com; daniela.pezzola@unipg.it

Abstract:

The attention for the replacement of peat in growing substrates is increasing due to its environmental and economic advantages. The aim of the present work was to evaluate the impact of peat substitution by new type olive mill pomace and its compost on the vegetative activity of potted olive trees. A new type of humid pomace (hP) derived from an innovative two phase extraction system and its derived compost (C-hP) are used as total or partial (50% vol/vol) replacement of peat in olive growing substrate. The main chemical characteristics (moisture, water extractable organic carbon, total nitrogen, C/N ratio and electrical conductivity) of the hP and C-hP were measured. In order to evaluate the effects of the peat substitution on the plants vegetative activity, measurements of mortality, plant height, leaf net photosynthesis and plant growth (through final destructive measurements) were carried out. The use of hP resulted in a significant increase of the salinity of the substrate. The water extractable organic carbon concentration was higher in all substrates where peat was ewplaced and in particular when C-hP was used. The total replacement of peat with hP caused 100% mortality of the plants while C-hP can substitute peat up to 50% without causing a significative reduction of the final plant growth.

Key words:

compost, olive pomace, olive tree, peat replacement

5–17 H. Ameziane, A. Nounah, M. Khamar and A. Zouahri
Composting olive pomace: evolution of organic matter and compost quality
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Composting olive pomace: evolution of organic matter and compost quality

H. Ameziane¹*, A. Nounah¹, M. Khamar¹ and A. Zouahri²

¹Mohammed V University, High School of Technology, Civil Engineering and Environment Laboratory (LGCE), Materials Water and Environment team, MA11060 Sale, Morocco
²INRA, Regional Center for Agricultural Research in Rabat, Research unit on Environment and Conservation of Natural Resources, MA10112 Rabat, Morocco
*Correspondence: amezianehalima@gmail.com

Abstract:

Morocco is one of the major olive-producing countries with an annual production of 1.56 million tonnes, part of which is dedicated to olive oil production. This important production generates, in addition to oil as the main product, a significant amount of waste (pomace and olive mill wastewater). The latter, when released in large quantities into the natural environment, cause fatal pollution. A suitable valuation of this waste will allow a clean and sustainable production for the sector. This work consists of composting olive pomace from the traditional system with two structural agents (poultry droppings and cattle manure) and comparing the two composts in terms of composting process parameters (pH, electrical conductivity, organic matter temperature, etc.), organic matter dynamics and compost quality, with manual aeration of the compost. Despite the high humidity level of the used pomace (80%), the adopted composting conditions have been effective in reducing high levels of organic matter and therefore organic carbon, as well as reducing the extreme phytotoxicity of the pomace. The experiment showed that the stabilization process in all the four treatments studied is comparable, and the final quality of the composts was adequate for agricultural use.

Key words:

compost phytotoxicity, compost quality, degradation of organic matter, olive pomace

2158–2171 H. Ameziane, A. Nounah, M. Khamar and A. Zouahri
Use of olive pomace as an amendment to improve physico-chemical parameters of soil fertility
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Use of olive pomace as an amendment to improve physico-chemical parameters of soil fertility

H. Ameziane¹*, A. Nounah¹, M. Khamar¹ and A. Zouahri²

¹Mohammed V University, High School of Technology, Civil Engineering and Environment Laboratory (LGCE), Materials Water and Environment team, MA11060 Sale, Morocco
²INRA, Regional Center for Agricultural Research in Rabat, Research unit on Environment and Conservation of Natural Resources, MA10112 Rabat, Morocco
*Correspondence: amezianehalima@gmail.com

Abstract:

Given their richness in nutritive elements, the majority of agricultural waste is used as soil amendments, including olive oil waste. The purpose of this study is to determine the effects of the use of olive pomace from three extraction systems on the physico-chemical fertility of the soil, after their use as an amendment for faba bean cultivation. The experiment is carried out at the Civil Engineering and Environment Laboratory in the EST of Salé, in pots where the olive pomace has been mixed with the soil, respecting the percentages studied. Several relative physico-chemical parameters of soil fertility were determined at the end of the experiment, namely pH, electrical conductivity (EC), total kjeldhal nitrogen (NTK) content, organic carbon and exchangeable bases concentration and soil cation exchange capacity (CEC) determination. Different percentages of pomace from the three extraction systems were applied (control, 10%, 15%, 25%, 50%, 75% and 100%) for four months of bean germination test. The application of the pomace reduced soil pH, and increased soil organic matter and organic carbon content in proportion to the added percentage of pomace. The available phosphorus and exchangeable potassium content increased significantly (p < 0.05) in pots containing different percentages of pomace compared to their concentrations in the soil (control). The total nitrogen content has not increased sufficiently but remains significantly different from the control, especially for the percentages of 25%, 50% and 75%. For its part, the cation exchange capacity (CEC) is important and will allow a good retention of nutrients for all percentages.

Key words:

olive pomace, physico-chemical fertility, soil amendment