Florida Gov. Ron DeSantis recently signed a bill that will allow the Florida Department of Transportation to study the use of phosphogypsum in road construction. This came after a longstanding federal-level prohibition on using phosphogypsum, which was repealed by then-President Donald Trump's Environmental Protection Agency (EPA) in October …
"Any request for a specific use of phosphogypsum in roads will need to be submitted to EPA, as EPA's approval is legally required before the material can be used in road construction," the agency ...
The first part is the study of the radioactivity of generated phosphogypsum, aiming to ensure that PG is safe to be used as construction material. The second part examines the physicochemical …
its 1992 BID, respectively, for various scenarios associated with use of phosphogypsum in road construction. The row numbers (1-4) denote exposure scenarios that are directly comparable. The lifetime risk of fatal cancer associated with the exposure is listed in the rightmost column. A value of 3
Other areas of the world, however, looked at phosphogypsum as a valuable raw material and developed processes to use it in chemical manufacture and construction materials. In 1989, stacking of phosphogypsum became a legal necessity when the U.S. Environmental Protection Agency (EPA) banned the use of phosphogypsum.
Approved Uses of Phosphogypsum (The Fertilizer Institute) On October 15, 2019, EPA received a request from The Fertilizer Institute (TFI), on behalf of its members that own or operate phosphogypsum stacks, to take phosphogypsum out of the stacks and use it in road construction. This request was subsequently revised on …
The utilization of the phosphogypsum is also possible in the construction of road pavements. This study shows that we can obtain the required mechanical performance in terms of (E, Rt) for the construction of capping layer, foundation and base layer by adopting the following formulation:(CM:PG:SM) HRB=(10:25:65):7.
Phosphogypsum (PG) is a by-product from the industry of phosphate fertilizer. Approximately 4–6 tonnes of PG are generated per tonne of phosphoric acid production. The continuous growth in the world population increases food production demand which requires an increase in phosphate fertilizer production resulting in an increase in PG …
The use of PG by Aspergillus niger is a viable way to increase soil phosphorus content, especially to reduce the consumption of phosphate resources and …
Phosphogypsum (PG) is a kind of industrial solid waste residue that is generated during the wet production of phosphoric acid. The main mineral composition of PG is CaSO 4 ·2H 2 O, and it is currently employed mostly in the field of building materials and the chemical industry [].PG has a complex chemical makeup and contains …
The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and atmosphere. Therefore, this paper analyzes the directions of phosphogypsum recycling and possible alternatives to its use. The main …
On October 15, 2019, EPA received a request from The Fertilizer Institute (TFI), on behalf of its members that own or operate phosphogypsum stacks, to take phosphogypsum out of the stacks and use it in road construction. This request was subsequently revised on …
Other areas of the world, however, looked at phosphogypsum as a valuable raw material and developed processes to use it in chemical manufacture and construction materials. In 1989, stacking of phosphogypsum in the U.S. became a legal necessity when the U.S. Environmental Protection Agency (EPA) banned its use.
Impurities in phosphogypsum, primarily fluorine and phosphates, complicate its use in any of the thermal processing schemes, but do not disqualify it from being used as a raw material. The plant in South Africa uses phosphogypsum as a feed stock, and the Polish plants are said to use a mixture of natural gypsum and phosphogypsum.
The aim of this study is to give an overview and to evaluate the existing and potential uses of PG that extend from soil stabilization to cement and chemical industry and for …
Phosphogypsum (PG) is a waste (or by-product) of the production of phosphoric acid, a basic constituent in the manufacturing of modern fertilizers. The annual production of phosphogypsum in Tunisia is currently estimated to be 10 million tons. Its storage in slag in close proximity to production plants generates pollution problems; …
"Any request for a specific use of phosphogypsum in roads will need to be submitted to EPA, as EPA's approval is legally required before the material can be used in road construction," the EPA ...
The EPA has regulated phosphogypsum since 1989. The EPA requires phosphogypsum to be placed in stacks. All uses of phosphogypsum waste have been banned unless the waste has very little radioactivity. TENORM: Fertilizer and Fertilizer Production Wastes This webpage provides information on fertilizer and fertilizer …
The phosphogypsum valorization became a necessity when the U.S. Environmental Protection Agency (EPA) legislation was modified in 1992 and allowed the use of PG with an average 226 Ra of less than 370 Bq/kg for agricultural applications such as a soil amendment. Other areas in the world, however, looked at PG as a valuable raw …
Phosphogypsum is the most significant industrial solid waste in the world. Phosphogypsum has a complex composition and its traditional storage methods occupy large areas of land and also damage the environment. Currently, phosphogypsum is mainly used for the direct preparation of construction materials and chemical auxiliary …
The use of phosphogypsum for the production of composite materials based on asphaltic binders has been common, as well as in road construction for the construction of road bases and as an additive to …
The EPA says "phosphogypsum remains prohibited from use in road construction," as it has been almost continuously for more than 30 years. Under former President Donald Trump, the EPA briefly ...
We hope that PG can be used for road construction on a large scale in the future. This paper focuses on the latest developments in PG as road materials. ... Al-Hwaiti M.S. Assessment of the radiological impacts of treated phosphogypsum used as the main constituent of building materials in Jordan. Environ. Earth Sci. 2015; 74 (4):3159–3169.
Potential uses of phosphogypsum: A review J Environ Sci Health A Tox Hazard Subst Environ Eng. 2022;57(9):746-763. doi: 10.1080/10934529.2022.2105632. ... More specifically, PG can be used as a substitute in the cement industry, in building materials and in road construction, as a fertilizer for soil improvement, as a raw material for the ...
Bills in the House and Senate that would authorize the Florida Department of Transportation to undertake demonstration projects and studies evaluating the use of phosphogypsum in road construction ...
The characteristics of phosphogypsum (PG) depend on the natural properties of the phosphate ore, the type of wet method used, the plant's operational …
sectors: road construction, building materials and agriculture. In agriculture, PG is used as an amendment for degraded soils (saline, sodic and acid soils) and as a fertil- ... Discuss the potential uses of phosphogypsum in agriculture (4) Define the effects of PG on crop production, soil, water, and the environment. Phosphogypsum contains
Phosphogypsum (PG) is the primary byproduct generated during the production of phosphoric acid, an intermediate product in phosphate fertilizer production, from calcium phosphate (apatite) ore. ... way to group PG samples by its texture and morphology that is particularly relevant if PG is investigated for potential use as a …
Phosphogypsum in construction industry. There are numerous ways and technologies to reuse by-products/residues in construction industry, most notably in Portland cement (both as cement and concrete), alkali-activated cement and concrete (geopolymers), ceramics and glass-ceramics, and gypsum, phosphogypsum in particular.
The Environmental Protection Agency (EPA) has withdrawn a 2020 rule that would allow a radioactive substance in some road construction.. The October 2020 rule allowed the use of phosphogypsum, a ...
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