The Environmental Protection Agency (EPA) has withdrawn a 2020 rule that would allow a radioactive substance in some road construction..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 ...
The Environmental Protection Agency (EPA) is withdrawing its October 14, 2020 approval for use of phosphogypsum in government road projects. Under the Clean Air Act, the EPA may approve a request for other use of phosphogypsum if it includes certain prescribed information. Upon further review,...
1. Introduction. Sustainability is based on economic development, social equity and environmental protection. Different nations under various international agreements have committed themselves to the goal of preserving natural resources, and the construction of a sustainable built environment [1].Nowadays, energy efficiency …
By finding a new way to use phosphogypsum, EPA is helping create a sustainable path to improve the environment while allowing for responsible reuse and …
Use of phosphogypsum in road construction The paper presents practical utilisation in the construction of a parking lot of compositions based on waste (phosphogypsum) from the wet process of orthophosphoric acid manufacture. The results of strength tests performed after half a year and after one and a half year of parking lot operation …
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 …
On October 14, 2020, the EPA approved The Fertilizer Institute's request to use phosphogypsum in government road construction projects subject to certain …
When PG are used for e.g., agriculture or construction purposes, nanoparticles (NPs) can be re-suspended by Aeolian and fluvial processes. Here we provide an overview and evaluation of the geochemical and radiological hazardous risks associated with the different uses of PG. In this review, we show that NPs are important …
"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 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 …
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 …
The Fertilizer Institute, however, argues that the use of phosphogypsum in road construction is safe and is used in other parts of the world. In response to the EPA withdrawing its approval of the ...
Synergistically developed AAC can be used in construction applications such as foundations, pavements, and building materials as a substation of conventional cement concrete.
A well-known method of disposing of solid wastes is to use them as materials for construction of roads. Research on the use of phosphogypsum in road engineering works was carried out in Florida, France, Finland and Poland [9, 10]. The paper presents the research on granulated phosphogypsum as a material for road construction.
Phosphogypsum (PG), the main industrial by-product of phosphate fertilizer industry, primarily consists of calcium sulfate dihydrate. However, it contains various impurities with variable quantities depending on the origin of the phosphate rock. These impurities can restrict the reuse of phosphogypsum as a secondary primary resource.
This research studies soil-compacted bricks using phosphogypsum (PG) in their dosage. Laboratory tests were performed to assess these bricks' physical characteristics. To obtain the bricks, two dosages were used: 4 and 7% of phosphogypsum (PG) concentration. Bricks with no phosphogypsum (PG) in their …
Use of phosphogypsum in road construction The paper presents practical utilisation in the construction of a parking lot of compositions based on waste (phosphogypsum) from the wet process of ...
The new law looks to clear the way for phosphogypsum to be used as a pavement aggregate alongside crushed stone, gravel, sand and other materials. In recent years industrial...
2 Executive Summary: This document details the review performed by the U.S. Environmental Protection Agency, Office of Radiation and Indoor Air, Radiation Protection Division, in response to the Radiological Risk Assessment in Support of Petition for Beneficial Use of Phosphogypsum prepared for The Fertilizer Institute (TFI) …
2. Material for the construction of highways and streets, 3. Material for pipe bedding, and 4. Material for load-bearing surfaces. While phosphogypsum does not present a viable alter native to use Number 1, it should be considered for the remaining categories. A significant portion of this construction mate
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
The characteristics of phosphogypsum (PG) depend on the natural properties of the phosphate ore, the type of wet method used, the plant's operational …
Phosphogypsum (PG) is a by-product generated from the phosphorus fertilizer industry (phosphoric acid production). PG is similar to natural gypsum, but there are some differences, of which it contains some impurities such as water-soluble phosphate (P 2 O 5), water-soluble fluoride (F −) and P 2 O 5 substituted in the gypsum crystal …
Use in Construction and Building Materials. Phosphogypsum has also been studied for use in construction and building materials. Use in such applications is always attractive for industrial by-products, as it provides an outlet for mass utilization, which is often a key requirement of waste reuse. ... Other phosphogypsum uses such as conversion ...
Potential uses of phosphogypsum: A review. Maria Pliaka Laboratory of Environmental Management and Industrial Ecology, ... 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 production of some chemicals, …
The scenarios upon which the EPA banned widespread phosphogypsum use concerned using it in road construction and agriculture. The scenarios assumed that the road or farm field would be abandoned 100 years later and that a home would be built on the land.
Phosphogypsum when subjected to compaction can be transformed into a solid of valuable strength. Therefore, it can be used very effectively as a binder to stabilize on-site soil …
The EPA determined that the use of phosphogypsum in limited agricultural and indoor research activities could be as protective of human health, in the short- and long-term, as stacking. These approved uses were incorporated into Subpart R at 40 CFR 61.204-205. The EPA also assessed the use of phosphogypsum in road construction.
Phosphogypsum (PG) is a by-product from the industry of phosphate fertilizer. • PG can be reused as a construction material. • Including PG in the matrix reduced its workability, density and mechanical strength. • Including PG in the matrix increased its shrinkage, expansion and water absorption. •
straints become more stringent, widespread uses of phospho gypsum must be developed. Ideally, such uses would involve large tonnages of pbosphogypswn preferably i11 its natural or as-produced tate. One such possible use could be as a base material in highway construction. To enhance the engineering
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 ...
