Abstract
Phosphogypsum (PG) is a by-product of the phosphorus (P) chemical industry, and usually contains ~2% residual phosphate. The P in PG would cause P pollution in the environment by the way of long-term stacking. Phosphate-solubilizing fungi (PSF) can effectively promote the release of P from insoluble phosphate. The aim of this study was to investigate the P release capacity between tricalcium phosphate (TCP) and PG by Aspergillus niger (ANG) via flask experiment. At the same time, the application of PG fertilizer (PGF) in soil was also performed. The dry biomass of ANG between TCP and PG treatment reached the maximum value of 0.71 and 0.38 g, respectively, after five days of incubation. The maximum P concentrations released from PG and TCP by ANG is five and seven days, i.e., 128 and 1103 mg/L, respectively. PG has a similar P release ratio compared with TCP by ANG, i.e., 52% vs. 55%. In the soil incubation experiment, PGF can significantly increase the soil available P content and continuously maintain the high concentration (17.2 mg/kg) after four weeks of incubation. The utilization of PG by ANG via the PGF is a feasible pathway to increase the soil P content, especially for the sustainable use of phosphate resources.
Highlights
Phosphate ore (PO) is the primary resource for the production of phosphoric acid, pesticides, and other phosphorus-related chemicals [1–3]
PO is critical to producing chemical phosphate fertilizer (CPF), especially in agricultural production [4]
This study aims to investigate the utilization of PG as a phosphate fertilizer with the combination of A. niger in a P deficient soil
Summary
Phosphate ore (PO) is the primary resource for the production of phosphoric acid, pesticides, and other phosphorus-related chemicals [1–3]. PO is critical to producing chemical phosphate fertilizer (CPF), especially in agricultural production [4]. The supply of CPF can provide phosphorus (P) for crop growth, which is important for food security and human development [4]. More than a million tons of PO is consumed in the effort of CPF production [5]. Phosphogypsum (PG) is a by-product of CPF production via the wet-process phosphoric acid technology [7]. The current global production of PG is estimated to be 100~280 Mt per year [8]. The reuse of PG as a phosphate fertilizer can slow down the exploitation of PO with positive benefits for the environment [12,13]. Besides soluble P and co-crystallized P, there is insoluble
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
