Employment of phosphate solubilising bacteria on fish scales - Turning food waste into an available phosphorus source
authors Santana, CA; Piccirillo, C; Pereira, SIA; Pullar, RC; Lima, SM; Castro, PML
nationality International
journal JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
author keywords Phosphorous; Solubilisation; Hydroxyapatite; Phosphate solubilising bacteria (PSB); By-products valorisation; Fish scales; Tilapia
keywords MICROWAVE SYNTHESIS; ROCK PHOSPHATE; ZEA-MAYS; HYDROXYAPATITE; GROWTH; COMPOSITE; EGGSHELL; RECOVERY
abstract The increased use of fertilisers is a well-known problem; linked to this, there is an always higher demand for phosphorus (P). Because of this, it is crucial to use P from all possible sources and, if necessary, turn it into a soluble form, available for plants/crops. In this paper we report the use of aerobic phosphate solubilising bacteria (PSB) on the scales of the tilapia (Coptodon rendalli) fish, a waste from the food industry; this is the first time that PSB were employed on fish scales to mediate the available P. The scales were calcined to 700 degrees C to obtain a nanoscale powdery material (more easily solubilised), made of hydroxyapatite, Ca-10(PO4)(6)(OH)(2), a calcium phosphate with very low solubility. Seventeen different PSB strains were tested for their ability to solubilise phosphate (commercial tricalcium phosphate - TCP) and hydroxyapatite from fish scale (FSHA). The best performing bacterial strain (Acidovorax oryzae ZS 1-7) led to a P solubilisation more than 60 times higher than the negative control - at 325 mg/L, almost 40% of the available P was solubilised - one of the highest increased efficiencies reported for PBS. Such solubilisation was linked to a decrease of the pH to more acidic values of about 4. The strain ZS 1-7 showed higher P solubilisation efficiency with fish-derived FSHA than with commercial TCP. This approach showed a promising strategy for the valorisation of residues of the fish industry, turning them into a source of P, to be used for sustainable agriculture.
publisher ELSEVIER SCI LTD
issn 2213-2929
isbn 2213-3437
year published 2019
volume 7
issue 5
digital object identifier (doi) 10.1016/j.jece.2019.103403
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000492151400117
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journal analysis (jcr 2019):
journal impact factor 4.3
5 year journal impact factor Not Available
category normalized journal impact factor percentile 73.526
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