Olive mill waste sludge: From permanent pollution to a highly beneficial organic biofertilizer: A critical review and future perspectives

Bouhia, Youness; Hafidi, Mohamed; Ouhdouch, Yedir; Lyamlouli, Karim

doi:10.1016/j.ecoenv.2023.114997

Cited by 13 publications

(3 citation statements)

References 67 publications

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“…Their disposal without any treatment generates serious environmental problems including coloring of natural waters, contamination of underground water, phytotoxicity and bad odors. The annual worldwide production of OMWs is estimated to be about 1 × 10 7 m 3 , most of which are produced in the Mediterranean area [1].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Bioremediation of Olive Mill Wastewaters: Combination of Straw Filtration and Nanofiltration

Chidichimo,

Basile,

Conidi

et al. 2024

Membranes

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A combination of straw filtration and nanofiltration was investigated for the first time as a sustainable approach aimed at valorizing olive mill wastewaters (OMWs) within a circular economy strategy. Ground straw filters with different granulometry (120, 250 and 500 μm) were tested in the first step to clarify the raw wastewater. The 500 μm filter offered the best performance due to a lower exposed surface of the filtering fibers and a shorter filtering time, allowing us to reduce about 70% of the chemical oxygen demand (COD) of the raw wastewater. Three different commercial membranes in a flat-sheet configuration with a molecular weight cut-off (MWCO) in the range 150–500 Da were tested to fractionate the clarified wastewater according to a dead-end configuration. Among the investigated membranes, a polymeric membrane of 500 Da (NFA-12A) exhibited the highest productivity in selected operating conditions (steady-state values of 11.4 L/m2 h at 20 bar and 24 ± 2 °C). In addition, flux decays for this membrane were lower than the other two tested membranes, indicating a lower propensity to fouling phenomena. Higher rejections towards total polyphenols and total antioxidant activity (TAA) (76.6% and 73.2%, respectively) were also observed for this membrane. Flavanols and hydroxycinnamic acids were retained by more than 99%. The combination of straw filtration and NF with the NFA-12A membrane allowed us to reduce the COD of raw OMWs up to 97.6%. The retentate fraction of this membrane exhibited a TAA of 18.9 ± 0.7 mM Trolox, supporting its propensity for the development of innovative formulations of interest in food and nutraceutical applications.

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Section: Introductionmentioning

confidence: 99%

A New Approach for Bioremediation of Olive Mill Wastewaters: Combination of Straw Filtration and Nanofiltration

Chidichimo,

Basile,

Conidi

et al. 2024

Membranes

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“…Composting is one of the most commonly used techniques for valuating organic residues due to its low operational cost and the production of a stable substrate enriched with nutrients, namely, compost. Furthermore, this ecofriendly, low-cost technology can realize the revalorization of organic waste, including sewage sludge, agricultural and forestry residues and animal manures, into organic fertilizers such as compost [1][2][3][4]. Composting is a process of exothermic oxidative microbial degradation consisting of mesophilic (25-45 °C), thermophilic (45-70 °C), late mesophilic and maturation stages [5].…”

Section: Introductionmentioning

confidence: 99%

Management of industrial wine residues: physicochemical, bacterial and fungal dynamics during composting processes

Echeverría-Vega,

Espinoza-Mondaca,

Arqueros-Sanhueza

et al. 2024

Discov Appl Sci

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To foster a circular bioeconomy throughout the management of industrial solid wine residues in the wine industry, this work presents the physicochemical and microbiological dynamics of the composting process with white grape pomace, stalks and wastewater treatment plant sludge from the same winery. Three composting windrows of 41 m3 were constructed with 0, 10 and 20% sludge addition. Physicochemical parameters were assessed following the Test Method for the Examination of Composting and Compost (TMECC), and the diversity and dynamics of the bacterial and fungal communities involved in the composting process were assessed via a high-throughput sequencing metabarcoding approach. The addition of sludge increased the moisture content, bulk density, and pH after six months of turned windrow composting. No effect of sludge addition on the macronutrient composition of the compost was observed. The Shannon‒Wiener index differed among stages and treatments. Bacterial diversity increased over time, while the fungal community appeared to be highly affected by the thermophilic stage, which led to a reduction in diversity that slightly recovered by the end of the process. Furthermore, the sludge exhibited high bacterial diversity but very low fungal diversity. Consequently, the design of on-site biologically based strategies to better manage wine residues can produce soil amendments, improve fertilization, reclaim damaged soils, and ultimately reduce management costs, making composting an economically attractive and sustainable alternative for waste management in the wine industry. Graphical Abstract

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“…The liquid waste from olive oil extraction, also referred to as olive mill wastewater (OMW), is a black acidic emulsion of vegetation water, fruit tissues (mucilage, pectin), and water added during processing (centrifugation and cleaning) [13]. The organic content in OMW typically ranges from 4% to 18% and has a low nitrogen content [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Incorporating Olive Mill Wastewater on Nutrients, Quality, and Bacterial Flora in Fermented Total Mixed Ration

et al. 2023

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Olive mill wastewater (OMW), a major by-product of the olive oil production industry, is rich in polyphenolic compounds that impart health benefits to several animals. Here, we evaluated the effects of OMW addition on the nutrients, quality, and bacterial composition of fermented total mixed ration (TMR). Different amounts of OMW (0%, 5%, 10%, and 20% in fresh matter) as a substitute for water were mixed with the formulated TMR and fermented for 4 weeks. At the initial stages of fermentation, OMW significantly altered the dry matter, pH, and lactic acid content; however, it had minor effects on most macronutrients, quality parameters, and bacterial flora in the final TMR product. OMW (10%) supplementation improved the polyphenolic compound content in the fermented TMR. However, OMW (10% and 20%) increased lipid levels beyond the recommended level of 3% in cow diets. OMW supplementation did not affect the microbial composition of TMR, except for an increased abundance of Weissella. These findings suggest that supplementation of 5–10% OMW improves the quality parameters of TMR without affecting the nutrient composition of fermented TMR. OMW can be used in cow feed; however, further studies involving feeding trials are needed to validate the effects of OMW on cows.

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Olive mill waste sludge: From permanent pollution to a highly beneficial organic biofertilizer: A critical review and future perspectives

Cited by 13 publications

References 67 publications

A New Approach for Bioremediation of Olive Mill Wastewaters: Combination of Straw Filtration and Nanofiltration

A New Approach for Bioremediation of Olive Mill Wastewaters: Combination of Straw Filtration and Nanofiltration

Management of industrial wine residues: physicochemical, bacterial and fungal dynamics during composting processes

Evaluation of the Effect of Incorporating Olive Mill Wastewater on Nutrients, Quality, and Bacterial Flora in Fermented Total Mixed Ration

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