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A complex mixture of organic pollutants (EOPs) enters the environment, which has potential impacts on aquatic life and human health.This cross-sectional study investigated dermal and inhalation exp...

The municipal solid waste transfer stations (MSWTSs) affects both the environment and human health. The present study aimed to investigatethe Concentrations of BTEX (benzene, toluene, ethylbenzene ...

This study aimed to evaluate the effects of outdoor benzene, toluene, xylenes, and styrene (BTXS) on respiratory system performance in adults living in an industrialized city. The concentration of ...

Background and Objectives: The world’s second largest permanent hypersaline lake, Lake Urmia, is drying in recent years and the dried bed of the Lake acts as a hypersaline particle emission source....

Blending of water from different sources into an urban drinking water distribution system can have unintended impacts, such as corrosion and/or release of corrosion by-products from pipe surfaces. Hamedan, a city in west Iran, receives water from four different sources that have different physical and chemical characteristics. The potential for iron release from iron distribution pipes due to in situ blending of different sources was investigated in this study. A dedicated software was developed to calculate the corrosion indices of different blends expected in different zones of Hamedan’s water distribution system. The calculated corrosion indices, and iron release were verified and correlated to actual conditions through water sampling conducted in different zones of the city. The Langelier index (LI), Ryznar stability index (RSI or RI), Puckorius scaling index (PSI), and the calcium carbonate precipitation potential were found to be −0.60 ± 0.30, 8.63 ± 0.57, 8.18 ± 0.34, and −10.95 ± 6.9 mg Ca...

The adsorption of a reactive dye, Ariazol Scarlet 2G (AS2G) (C.I.: Reactive Red 234), onto compost, from aqueous solutions, was studied in a batch system. The effects of initial dye concentration, initial pH and sorbent mass have been studied. Four two-parameter isotherm models–Langmuir, Freundlich, Temkin and Harkins Jura – were used to fit the experimental data using a nonlinear trial-and-error method. The best fi t of the adsorption isotherm data was obtained using the Langmuir model (X 2 = 1.97E−03). A comparison of kinetic models applied to the adsorption of AS2G on compost was evaluated using the pseudo-second order, Elovich and Lagergren first-order kinetic models. Results showed that the pseudo-second order kinetic model was found to agree well with the experimental data. An intra-particle diffusion model analysis showed multi-linearity with two steps and a non-zero intercept which indicated the intra-particle diffusion model is not a dominant rate controlling mechanism in the sorption of AS2G by ...

Chromium (VI) is known to be potentially carcinogenic and mutagenic in humans. A low-cost industrial solid bioadsorbent, bagasse-based activated charcoal (BAC), has been investigated for removal of chromium from aqueous solution. All the experiments were carried out in batch process with laboratory-prepared samples to study the effects of adsorbent dose, contact time, pH and initial concentration of Cr(VI). The removal of chromium ion was found to be highly dependent on the pH of the solution, adsorbent dose and contact time. Also the equilibrium adsorption was analyzed by the Freundlich and Langmuir isotherm models. It was found that the Freundlich isotherm model best described the sorption of chromium by sugar beet bagasse-based activated charcoal (r20.9927). Experimental data of kinetic studies were fitted to pseudo-first-order, pseudo-second-order and modified pseudo-first-order models. The results showed pseudo-second order kinetics was best fitted to the collected data (r20.9893). Optimum conditions for adsorption were determined at pH 2 and a contact time of 180 minutes (92.7% removal). These retention capacities suggest that BAC can provide a simple, effective, and cheap method for removing Cr(VI) ions from effluents and water resources.