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Ferrández-Gómez B, Jordá JD, Cerdán M, Sánchez A. Valorization of Posidonia oceanica biomass: Role on germination of cucumber and tomato seeds. Waste Manag 2023; 171:634-641. [PMID: 37857050 DOI: 10.1016/j.wasman.2023.10.010] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 09/18/2023] [Accepted: 10/09/2023] [Indexed: 10/21/2023]
Abstract
Biostimulants are organic compounds from plant sources such as botanical extracts and bioactive substances that promote plant growth, enhance photosynthesis and increase crop quality. The accumulation of detached Posidonia oceanica leaves on coasts of the Mediterranean Sea results in economic problems, due to the rejection of the tourists who frequent the beaches in the summer months. However, it is a plant with high content of secondary metabolites that can be used in sustainable agriculture. In this study we investigated the physicochemical characterization of Posidonia oceanica extracts with three different solutions and their application in tomato and cucumber seeds germination. The results showed that the aqueous extract of Posidonia oceanica had a high concentration of macro and micronutrients, as well as secondary metabolites with bioactive activity. The aqueous extract had a beneficial effect on both leaf and root growth on tomato seeds, specifically, an increase of 76% for the relative root growth and 73% for the germination index was obtained with respect to the control using the sample with the intermediate dilution (POe0.5). In addition, the extracts did not show toxicity to either germination or growth of the tomato plant. As for cucumber seed germination, the improvement was less significant and did result in a phytotoxic effect on both germination and plant growth. The most diluted extract had better results on seed germination. Therefore, the application of aqueous extracts of Posidonia oceanica were suitable to be appropriate for tomato germination and in turn contribute to eliminate the lots of Posidonia oceanica remains recovered in summer months in Mediterranean beaches.
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Affiliation(s)
- Borja Ferrández-Gómez
- Department of Biochemistry and Molecular Biology and Edaphology and Agricultural Chemistry, University of Alicante, 03080 Alicante, Spain
| | - Juana D Jordá
- Department of Biochemistry and Molecular Biology and Edaphology and Agricultural Chemistry, University of Alicante, 03080 Alicante, Spain
| | - Mar Cerdán
- Department of Biochemistry and Molecular Biology and Edaphology and Agricultural Chemistry, University of Alicante, 03080 Alicante, Spain
| | - Antonio Sánchez
- Department of Biochemistry and Molecular Biology and Edaphology and Agricultural Chemistry, University of Alicante, 03080 Alicante, Spain.
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Ferrández-Gómez B, Sánchez A, Jordá JD, Fonfría ES, Bordehore C, Cerdán M. Effectiveness of Oxygen-Saturated Seawater Injections and Air Sparging Technologies in Remediation of Coastal Marine Sediments from Sludge. Environ Geochem Health 2021; 43:4975-4986. [PMID: 33966170 DOI: 10.1007/s10653-021-00952-9] [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: 11/11/2020] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
The occurrence of hypoxic muddy sediments on shallow beaches and other sheltered areas is a well-known environmental problem, which negatively affects coastal areas, tourism potential, the public use of beaches and sediment biodiversity. The usual solution is limited to dredging and removal of sludge to a landfill site. In this study, a laboratory-scale experiment was performed to determine the effectiveness of two technologies: a modification of air sparging and a new approach based on injecting oxygen-saturated seawater in hypoxic muddy sediments (oxygen-saturated seawater injections method), for remediating sludge in coastal sediments, minimizing environmental impact respect to dredging. Our results showed that both technologies significantly increased dissolved oxygen content in pore water, facilitating the oxidation of more than 90% of the organic matter, and other reduced inorganic compounds such as sulphide, with the consequent increase in sulphate concentration from 0.3 to 3.0 g·L-1. Moreover, a rise of redox potential from - 258 mV to above 200 mV, and a dramatic drop in chemical oxygen demand were also indicators that oxic conditions had been restored. After 65 days, soft, black, muddy and hypoxic sediment with high organic matter content and a characteristic foul odour was transformed into well-oxygenated sediment, which had a low organic matter content and had lost its initial shiny black colour and odour. The main difference between both technologies was the depth influenced by sediment remediation; oxygen-saturated seawater injections affected deeper areas than clean pressurized air injections.
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Affiliation(s)
- Borja Ferrández-Gómez
- Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Campus San Vicente del Raspeig, 03690, Alicante, Spain
| | - Antonio Sánchez
- Departamento de Agroquímica y Bioquímica. Facultad de Ciencias, Universidad de Alicante. Campus de San Vicente del Raspeig, 03690, Alicante, Spain
| | - Juana D Jordá
- Departamento de Agroquímica y Bioquímica. Facultad de Ciencias, Universidad de Alicante. Campus de San Vicente del Raspeig, 03690, Alicante, Spain
- Instituto Multidisciplinar Para El Estudio del Medio "Ramón Margalef", Universidad de Alicante, Campus San Vicente del Raspeig, 03690, Alicante, Spain
| | - Eva S Fonfría
- Instituto Multidisciplinar Para El Estudio del Medio "Ramón Margalef", Universidad de Alicante, Campus San Vicente del Raspeig, 03690, Alicante, Spain
| | - César Bordehore
- Instituto Multidisciplinar Para El Estudio del Medio "Ramón Margalef", Universidad de Alicante, Campus San Vicente del Raspeig, 03690, Alicante, Spain
- Departamento de Ecología, Universidad de Alicante, Campus San Vicente del Raspeig, 03690, Alicante, Spain
| | - Mar Cerdán
- Departamento de Agroquímica y Bioquímica. Facultad de Ciencias, Universidad de Alicante. Campus de San Vicente del Raspeig, 03690, Alicante, Spain.
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Ferrández-Gómez B, Ruiz-Rosas R, Beaumont S, Cazorla-Amorós D, Morallón E. Electrochemical regeneration of spent activated carbon from drinking water treatment plant at different scale reactors. Chemosphere 2021; 264:128399. [PMID: 33011480 DOI: 10.1016/j.chemosphere.2020.128399] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 06/08/2020] [Revised: 09/16/2020] [Accepted: 09/18/2020] [Indexed: 06/11/2023]
Abstract
The electrochemical regeneration of real spent activated carbons (AC) used in drinking water treatment plants was studied at different reactor scales. The electrochemical regeneration was carried out in a 6 g filter-press cell and a 3.5 kg batch reactor, allowing the scaling-up of the process between the two electrolytic reactors. The effect of the electrolyte, the divided/undivided compartment configuration and the current density were studied in the filter-press cell. The effect of compartment configuration and the influence of the regeneration time were studied in the scaled-up reactor. A current density of 0.025 A cm-2 was used and the electrodes were Pt/Ti as anode and Pt/Ti and stainless-steel as cathode. The ACs were characterized by N2 adsorption isotherms to analyse the recovery of porosity and TPD-MS to analyse the AC surface after the electrochemical treatment. In filter-press cell, a recovery of the surface area of 96% was achieved after 8 h of treatment, by introducing the AC in the cathodic compartment using 0.05 M H2SO4 solution as electrolyte. In the 3.5 kg electrochemical reactor, 95% of the pristine AC surface area was recovered. Thus, electrochemical methods can provide a green alternative to the regeneration of spent AC.
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Affiliation(s)
- B Ferrández-Gómez
- Materials Institute and Department of Physical Chemistry, University of Alicante, PO Box 99, 03080, Alicante, Spain.
| | - R Ruiz-Rosas
- Materials Institute and Department of Inorganic Chemistry, University of Alicante, PO Box 99, 03080, Alicante, Spain.
| | - S Beaumont
- Materials Institute and Department of Physical Chemistry, University of Alicante, PO Box 99, 03080, Alicante, Spain.
| | - D Cazorla-Amorós
- Materials Institute and Department of Inorganic Chemistry, University of Alicante, PO Box 99, 03080, Alicante, Spain.
| | - E Morallón
- Materials Institute and Department of Physical Chemistry, University of Alicante, PO Box 99, 03080, Alicante, Spain.
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