1
|
Bouhia Y, Hafidi M, Ouhdouch Y, Soulaimani A, Zeroual Y, Lyamlouli K. Microbial intervention improves pollutant removal and semi-liquid organo-mineral fertilizer production from olive mill wastewater sludge and rock phosphate. J Environ Manage 2024; 354:120317. [PMID: 38387346 DOI: 10.1016/j.jenvman.2024.120317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/25/2024] [Accepted: 02/07/2024] [Indexed: 02/24/2024]
Abstract
Olive mill wastewater sludge (OMWS) represents a residual pollutant generated by the olive oil industry, often stored in exposed evaporation ponds, leading to contamination of nearby land and water resources. Despite its promising composition, the valorization of OMWS remains underexplored compared to olive mill wastewater (OMW). This study aims to identify potent native microbial species within OMWS suitable for bioremediation and its transformation into a high-value organic fertilizer. The microbial screening, based on assessing OMWS tolerance and phosphate solubilization properties in vitro, followed by a singular inoculation using a mixture of OMWS and rock phosphate (RP). Identification of FUN 06 (Galactomyces Geotrichum), a fungal species, employed as an inoculant in the treatment of sterile OMWS supplemented with RP. Results demonstrate that fungal inoculation notably diminished OMWS phytotoxicity while enhancing its physicochemical parameters, nutrient concentrations, and removal of toxic organic compounds by up to 90% compared to the control, and enhances plant growth, offering a sustainable approach to tackle environmental concerns. Additionally, metataxonomic analysis unveiled FUN 06's propensity to enhance the presence of microbial species engaged in pollutant degradation. However, higher RP dosage (10%) appeared to adversely affect bioprocess efficiency, suggesting a potential dose-related effect. Overall, FUN 06, isolated from OMWS evaporation ponds, shows promise for effective bioremediation and sustainable reuse. In fact, our results indicate that targeted microbial inoculation stands as an effective strategy for mitigating pollutants in OMWS, facilitating its conversion into a nutrient-rich organo-mineral fertilizer suitable for direct use, promoting its beneficial reuse in agriculture, thereby presenting a promising avenue for olive oil waste management.
Collapse
Affiliation(s)
- Youness Bouhia
- Faculty of Sciences Semlalia, Laboratory of Microbial Biotechnology, AgroSciences and Environment, Labeled Research Unit CNRST N°4 Faculty of Sciences Semlalia, Cadi Ayyad University UCA, Marrakesh, 40000, Morocco.
| | - Mohamed Hafidi
- Faculty of Sciences Semlalia, Laboratory of Microbial Biotechnology, AgroSciences and Environment, Labeled Research Unit CNRST N°4 Faculty of Sciences Semlalia, Cadi Ayyad University UCA, Marrakesh, 40000, Morocco; African Sustainable Agriculture Research Institute (ASARI), College for Sustainable Agriculture and Environmental Sciences University Mohammed VI Polytechnic (UM6P), Laayoune, 70000, Morocco
| | - Yedir Ouhdouch
- Faculty of Sciences Semlalia, Laboratory of Microbial Biotechnology, AgroSciences and Environment, Labeled Research Unit CNRST N°4 Faculty of Sciences Semlalia, Cadi Ayyad University UCA, Marrakesh, 40000, Morocco; African Sustainable Agriculture Research Institute (ASARI), College for Sustainable Agriculture and Environmental Sciences University Mohammed VI Polytechnic (UM6P), Laayoune, 70000, Morocco
| | - Aziz Soulaimani
- Agricultural Innovation and Technology Transfer Center (AITTC), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
| | | | - Karim Lyamlouli
- AgroBioSciences Program, College for Sustainable Agriculture and Environmental Sciences, University Mohammed VI Polytechnic (UM6P), Ben Guerir, 43150, Morocco
| |
Collapse
|