Management of waste containing polybrominated diphenyl ethers: A review.

Polybrominated diphenyl ethers (PBDEs) are substances used as flame retardants that can be released into the environment through volatilization, leaching, and abrasion throughout the useful life of the articles that contain them, especially at the end of their life cycle because PBDEs do not chemically bind to the initial materials (electrical and electronic equipment, textiles, materials used in transport vehicles, toys, among others). Research has shown that the toxic effects and risks of PBDEs to ecosystems and human health are greater than their benefits owing to their neurotoxicity, toxicity to the endocrine and reproductive systems, and possible carcinogenicity. This review shows the current situation of management of waste containing PBDEs (plastics, sludge, soil, and ash) and the characterization, valorization, treatment, and final disposal of these wastes, to minimize their impacts on ecosystems and human health are analyzed.

Valorization of treated wastewater from the soaking of baby alpaca skin fur.

Baby alpaca fur industry generates considerable wastewater during the soaking process, which contains high levels of total suspended solids (TSSs), proteins, and salts, among other components. The valorization of wastewater after precipitation, coagulation-flocculation, and aeration treatments was evaluated for use in irrigation water, fertigation, groundwater recharge, concrete construction, and disposal. The precipitation treatment sludge and the coagulation-flocculation treatment were evaluated as a protein source, soil quality improvement, and disposal.

Stabilization of residual mercury from gold mining as metacinnabar and cinnabar in ball mills on a pilot scale.

Waste liquid mercury generated as a by-product of the Merrill-Crowe process in gold mining and recovered from mercury-containing waste must be stabilized for secure storage or disposal. This study developed a procedure for mercury stabilization. A ball mill with a 0.

Sand washing of oil spill-affected beaches using concentrated β-glucans obtained from residual baker's yeast.

Valorization of residual yeast of the bakery industry for use in the remediation of oil-contaminated soils as an emulsifier is a biocompatible and effective process that will reduce environmental pollution. The aim of this study was to use concentrated β-glucan obtained from residual baker's yeast, , as an emulsifier to remove total petroleum hydrocarbons (TPH) from the contaminated sands of two beaches affected by the oil spill that occurred in January 2022 north of Lima, Peru. The extraction and concentration of β-glucan from sand were performed at a pilot scale using autolysis with 3 % sodium chloride, temperature elevation, treatment with organic solvents and water, hydrolysis via proteases, and vacuum filtration.

The predictive model of hydrobiological diversity in the Asana-Tumilaca basin, Peru based on water physicochemical parameters and sediment metal content.

The hydrobiological diversity in the basin depends on biotic and abiotic factors. A predictive model of hydrobiological diversity for periphyton and macrobenthos was developed through multiple linear regression analysis (MLRA) based on the physicochemical parameters of water (PPW) and metal content in sediments (MCS) from eight monitoring stations in the Asana-Tumilaca Basin during the dry and wet seasons. The electrical conductivity presented values between 47.

Valorisation of Roscoe postharvest residues as byproducts with antioxidant capacity.

During the postharvest phase of ginger, 2.6%-5% by weight of ginger rhizome residues are generated, which are disposed in landfills and constitute a continuous source of organic contamination causing serious environmental problems. The objective of this study was to valorise ginger postharvest residues (shoot, finger, slice, trunk, root, and rootles) from district Pichanaki (Peru) as dry powdered byproducts with an antioxidant capacity similar to that of rhizome.

Evaluation of antioxidant capacity, structure, and surface morphology of ginger () using different extraction methods.

The antioxidant capacity of ginger depends on the type of variety, growing conditions, postharvest, drying method, extraction, and measurement, among others. The objective of the research was to compare the efficiency of ultrasound (US), magnetic agitation (AM), maceration (M), and reflux (R) extraction methods. In the GFD (fresh air-dried ginger) extract, the contents of total phenolic content (TFC), 6-gingerol (6-G), and 6-shogaol (6-S) were evaluated; as well as the antioxidant capacity by FRAP (ferric reducing antioxidant power) and IC in DPPH (2,2-diphenyl-1-picrylhydrazyl radical).