Pathogens Evolution During the Composting of the Household Waste Mixture Enriched with Phosphate Residues and Olive Oil Mill Wastewater

Atif, Khadija; Haouas, Ayoub; Aziz, Faissal; Jamali, Mohammed Yasser; Tallou, Anas; Amir, Soumia

doi:10.1007/s12649-018-0495-3

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…In the last decade, studies investigated the fungal communities in compost, confirming that fungi are a significant part of the microbial community, in particular during the maturation phase [ 1 , 8 , 14 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Moreover, some of these studies detected fungal species that are useful during stages of maturation [ 19 , 21 , 24 ] and/or potentially harmful [ 12 , 17 , 20 , 25 ]. For these reasons, it is fundamental to conduct studies on fungal communities involved in the composting processes in order to select both useful populations to improve the process and to investigate the presence of potentially harmful species.…”

Section: Introductionmentioning

confidence: 99%

Thermotolerant and Thermophilic Mycobiota in Different Steps of Compost Maturation

et al. 2020

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Composting is a complex process in which various micro-organisms, mainly fungi and bacteria, are involved. The process depends on a large number of factors (biological, chemical, and physical) among which microbial populations play a fundamental role. The high temperatures that occur during the composting process indicate the presence of thermotolerant and thermophilic micro-organisms that are key for the optimization of the process. However, the same micro-organisms can be harmful (allergenic, pathogenic) for workers that handle large quantities of material in the plant, and for end users, for example, in the indoor environment (e.g., pots in houses and offices). Accurate knowledge of thermotolerant and thermophilic organisms present during the composting stages is required to find key organisms to improve the process and estimate potential health risks. The objective of the present work was to study thermotolerant and thermophilic mycobiota at different time points of compost maturation. Fungi were isolated at four temperatures (25, 37, 45, and 50 °C) from compost samples collected at five different steps during a 21-day compost-maturation period in an active composting plant in Liguria (northwestern Italy). The samples were subsequently plated on three different media. Our results showed a high presence of fungi with an order of magnitude ranging from 1 × 104 to 3 × 105 colony-forming units (CFU) g−1. The isolated strains, identified by means of specific molecular tools (ITS, beta-tubulin, calmodulin, elongation factor 1-alpha, and LSU sequencing), belonged to 45 different species. Several thermophilic species belonging to genera Thermoascus and Thermomyces were detected, which could be key during composting. Moreover, the presence of several potentially harmful fungal species, such as Aspergillus fumigatus, A. terreus, and Scedosporium apiospermum, were found during the whole process, including the final product. Results highlighted the importance of surveying the mycobiota involved in the composting process in order to: (i) find solutions to improve efficiency and (ii) reduce health risks.

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Section: Introductionmentioning

confidence: 99%

Thermotolerant and Thermophilic Mycobiota in Different Steps of Compost Maturation

et al. 2020

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“…Large and diverse communities of bacteria, actinomycetes, and fungi are actively involved in the conversion and decomposition of lignocellulosic materials (Atif et al 2020 ; Varma et al 2017 ). The changes in microbial viability and activity throughout the biodegradation of composting mixtures are illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of bacterial inoculation on co-composting of lavender (Lavandula angustifolia Mill.) waste and cattle manure

et al. 2021

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The primary purpose of this study was to investigate the influence of Cellulomonas flavigena and Streptomyces viridosporus, as a bacterial inoculant, on the compostability of post-extraction lavender waste. The major physicochemical, microbiological, and biological properties of the composting materials were monitored for 161 days. The technology developed was shown to improve the compostability of recalcitrant herbal residues. The use of lavender waste beneficially affected the composting process by extending the thermophilic phase, accelerating the degradation of organic matter, and elevating the viable counts of useful microorganisms; however, adverse effects were also observed, including an increased carbon-to-nitrogen ratio (19.05) and a decreased germination index (93.4%). Bacterial inoculation was found to preserve the nitrogen content (2.50%) and improve the efficiency of biodegradation. The Salmonella- and Escherichia coli-free final composting products were mature, stable, and ready for soil application. To the authors’ knowledge, no previous research has investigated the compostability of lavender waste. Likewise, this is the first study that has used strains of C. flavigena and S. viridosporus in combination to facilitate a composting process.

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“…PS was collected from a deposit area around the phosphate laundry plant managed by OCP, SA in Khouribga City (center of Morocco) (32°44'16.2"N; 6°50'48.2"W), which was produced between 1990 and 2000 (Figure 1a). The total quantity of 10000 Kg of PS samples was taken from different points, and homogeneous subsamples (Figure 1b) were prepared using the quartering method (Atif et al, 2020).…”

Section: Samplingmentioning

confidence: 99%

“…PS sample of 10 g transported from the sampling site in sterile bags at +4°C was stirred in 90 ml of a buffer solution (0.06 M Na 2 HPO 4 /NaH 2 PO 4 ) (1/9 v/v) at pH 7.6. A series of dilutions (10 -1 to 10 -10 ) of the sample was made and aseptically inoculated into the following selective growth media as described by Atif et al (2020):…”

Section: Enumeration Of Pathogensmentioning

confidence: 99%

Phosphate sludge: opportunities for use as a fertilizer in deficient.

et al. 2021

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Phosphate sludge (PS) is an industrial by-product produced in huge quantities by the phosphate beneficiation plants in Morocco. In order to valorize this by-product, it was examined for its potential use as a soil fertilizer. The physicochemical properties, elemental and mineral content, morphological structure, and component stability of raw PS were investigated. In addition, pathogenicity, phytotoxicity, and the capacity of PS to promote plant growth in deficient sandy soil have been studied. The obtained results showed that PS was characterized by low values of moisture (2.10%), electrical conductivity (EC) (0.77 mS/cm), and organic matter (OM) (0.61%), with a slightly alkaline pH (8.20). Nevertheless, this material carried interesting content of fertilizing elements such as phosphorus (P2O5) of 20.01%, calcium (CaO) of 39.72%, and magnesium (MgO) of 2.33%. Thus, PS did not present any pathogenic or phytotoxic risk with a high increase in tomato plant growth than the control of only soil. In conclusion, the results of this study could provide the primary practical guidance for the PS application in deficient soils characterized by sandy texture.

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Pathogens Evolution During the Composting of the Household Waste Mixture Enriched with Phosphate Residues and Olive Oil Mill Wastewater

Cited by 12 publications

References 35 publications

Thermotolerant and Thermophilic Mycobiota in Different Steps of Compost Maturation

Thermotolerant and Thermophilic Mycobiota in Different Steps of Compost Maturation

Effect of bacterial inoculation on co-composting of lavender (Lavandula angustifolia Mill.) waste and cattle manure

Phosphate sludge: opportunities for use as a fertilizer in deficient.

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