Preparation and characterization of activated carbon from a new raw lignocellulosic material: Flamboyant (Delonix regia) pods

Activated carbons were prepared from flamboyant pods by NaOH activation at three different NaOH:char ratios: 1:1 (AC-1), 2:1 (AC-2), and 3:1 (AC-3). The properties of these carbons, including BET surface area, pore volume, pore size distribution, and pore diameter, were characterized from N₂ adsorption isotherms. The activated carbons obtained were essentially microporous and had BET surface area ranging from 303 to 2463 m² g⁻¹.¹³C (CP/MAS and MAS) solid-state NMR shows that the lignocellulosic structures were completely transformed into a polycyclic material after activation process, thermogravimetry shows a high thermal resistance, Boehm titration and Fourier-transform infrared spectroscopy allowed characterizing the presence of functional groups on the surface of activated carbons. Scanning electron microscopy images showed a high pore development. The experimental results indicated the potential use of flamboyant pods as a precursor material in the preparation of activated carbon.     

From Superfund Site to Developable Property: The Case of Rentokil

The Comprehensive Environmental Response, Compensation, and Liability Act (42 USC §§9601 et seq.), commonly known as Superfund, was enacted on 11 December 1980 to facilitate the clean-up of hazardous waste sites. Superfund authorizes the Environmental Protection Agency (EPA) to compel responsible parties to clean up such sites. Superfund has been the source of extensive criticism since its inception. In response to this criticism, the EPA undertook a series of administrative reforms in 1993 to make the Superfund programme faster, fairer and more efficient. As of September 2000, active site remediation was complete at 757 (43%) of the 1779 national priority list (NPL) sites and 218 sites (12%) had been deleted from the NPL. Rentokil, a former wood-preserving plant on a 10 acre (4 ha) site in Henrico County, Virginia, was brought to the Virginia Health Department's attention as a threat to human health and the environment in 1989, was listed on the NPL the same year and was fully cleaned up in 1999. The cost of cleaning up Rentokil was $12 million, or $37.08 per square foot ($412 per square metre). The site is proposed to be redeveloped for tax-generating light industrial and commercial use. Rentokil reflects the EPA's implementation of several reforms geared toward reconciling cost considerations with remedy effectiveness and expedient implementation, and facilitating redevelopment. This case study's examination of Rentokil's progression through the Superfund process is intended to provide planning practitioners and students with insight into the Superfund programme and process, as well as an awareness of the challenges confronting Superfund's success.     

Organic matter characteristics and nutrient content in eroded soils

Twenty-one severely eroded soils of SE Spain (Torriorthent xeric soils) were studied. These soils form a fragile system characterized by soils with a low density of plant cover (<5%), are loamy and occur in a semiarid climate. The soils formerly were used for agricultural purposes but were abandoned at least 15 years ago. These eroded soils had a low total organic carbon content, and their humic substances, humic acid carbon, and carbohydrates were lower compared with soils that had never been cultivated (natural soils). The variables in which the effects of erosion were particularly noted were those related with the active organic matter (respiration and water-soluble organic matter). Those eroded soils with higher salt content showed lower organic matter and carbohydrate contents. Only total nitrogen was correlated with the carbon fractions in the eroded soils.     

Changes in carbon fractions during composting and maturation of organic wastes

Seven mixtures from four organic residues—an aerobic sewage sludge, a city refuse, a peat residue, and a grape debris—were composted, and the changes undergone by their different carbon fractions during their composting and maturation were studied. In most cases a decrease in carbon fractions during the composting and maturation processes was observed. The extractable carbon, however, increased during maturation. Organic matter mineralization was greater in the composts with city refuse than in those with sewage sludge. The samples with peat residue showed the lowest decreases in carbon fractions. During maturation, an increase of humiclike fraction was observed, which was reflected by a decrease in the soluble carbon-precipitated carbon ratio at pH 2. Water-soluble carbon was the carbon fraction most easily degradable by microorganisms, and its amount correlated significantly with composting time in all the samples.     

Hepatitis A Outbreaks and Environmental Circulation of Genotype IA Strains in the São Paulo City, 2017–2018

Food and Environmental Virology - Hepatitis A virus (HAV) is the major cause of enterically transmitted infectious hepatitis. Between 2016 and 2017, the number of confirmed cases of hepatitis A...