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Cluj-Napoca, Romania

Mosneag S.C.,Somes Water Company | Mosneag S.C.,Technical University of Cluj Napoca | Popescu V.,Technical University of Cluj Napoca | Dinescu A.,National Institute for Research and Development in Microtechnologies | Borodi G.,Romanian Institute of Isotopic And Molecular Technology
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2013

The level of nitrates from groundwater from Cluj County and other areas from Romania have increased values, exceeding or getting close to the allowed limit values, putting in danger human and animal heath. In this study we used granular activated carbon adsorbent (GAC) for nitrate (NO- 3) removal for the production of drinking water from groundwater of the Cluj county. The influences of the contact time, nitrate initial concentration, and adsorbent concentration have been studied. We determined the equilibrium adsorption capacity of GAC, used for NO- 3 removal and we applied the Langmuir and Freundlich isotherm models. Ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, X ray diffraction (XRD), Scanning Electron Microscopy (SEM) were used for process characterization. We also determined: pH, conductivity, Total Dissolved Solids and Total Hardness. The GAC adsorbents have excellent capacities of removing nitrate from groundwater from Cluj County areas. © 2013 Copyright Taylor and Francis Group, LLC.

Farkas A.,Somes Water Company | Dragan-Bularda M.,Babes - Bolyai University | Ciataras D.,Somes Water Company | Bocos B.,National Public Health Institute | Tigan S.,University of Medicine and Pharmacy, Cluj-Napoca
Journal of Water and Health | Year: 2012

Biofouling occurs without exception in all water systems, with undesirable effects such as biocorrosion and deterioration of water quality. Drinking water associated biofilms represent a potential risk to human health by harbouring pathogenic or toxin-releasing microorganisms. This is the first study investigating the attached microbiota, with potential threat to human health, in a public water system in Romania. The presence and the seasonal variation of viable faecal indicators and opportunistic pathogens were investigated within naturally developed biofilms in a drinking water treatment plant. Bacterial frequencies were correlated with microbial loads in biofilms as well as with physical and chemical characteristics of biofilms and raw water. The biofilms assessed in the current study proved to be extremely active microbial consortia. High bacterial numbers were recovered by cultivation, including Pseudomonas aeruginosa, Escherichia coli, Aeromonas hydrophila, intestinal enterococci and Clostridium perfringens. There were no Legionella spp. detected in any biofilm sample. Emergence of opportunistic pathogens in biofilms was not significantly affected by the surface material, but by the treatment process. Implementation of a water safety plan encompassing measures to prevent microbial contamination and to control biofouling would be appropriate. © IWA Publishing 2012.

Farkas A.,Somes Water Company | Ciataras D.,Somes Water Company | Tigan S.I.,University of Medicine and Pharmacy, Cluj-Napoca
Applied Medical Informatics | Year: 2010

The quality of drinking-water in Cluj-Napoca is controlled through a combination of measures: protection of water sources, control of treatment processes and management of the distribution and handling of the water. The first component, protection of water sources may be done only knowing as much of water quality and of the factors that threaten it. The present paper reveals the water source of Cluj, Gilǎu Lake and his affluent Someşul Rece River monitoring in a period of 5 years, between 2005 and 2009, their physical, chemical and microbiological parameters being monitored once a month, watching on the evolution of water quality. This surveillance offers a review of the safety and acceptability of drinking water supplies in Cluj County and contributes with several applicative aspects towards water quality supervision and evolution in time of the big dam reservoirs and their tributaries, which may be a major source of pollution downstream. Descriptive analyses, including the mean value, variability, trends, correlations and graphic displays were performed; SPSS and Epi-Info 2000 statistical software were used. Data analysis revealed that the good quality of Gilǎu Lake regarding physical and chemical parameters led to its framing in A1 quality category, except for ammonium and microbiological parameters, which allowed the framing in A2 quality category. Major averages in Someşul Rece than in Gilǎu Lake, up to 14 fold for faecal coliforms indicates the fact that the river worked out an important and constant pollution cause for Gilǎu water source during the period of time considered. © 2010 by the authors.

Mosneag S.C.,Somes Water Company | Mosneag S.C.,Technical University of Cluj Napoca | Popescu V.,Technical University of Cluj Napoca | Neamtu C.,Somes Water Company | Borodi G.,Romanian Institute of Isotopic And Molecular Technology
Desalination and Water Treatment | Year: 2014

This paper focuses on a comparative study regarding the performance of natural zeolite from Mirşid (NZM) and granular activated carbon (GAC), respectively, for treatment process of contaminated groundwater from Căpuş, Cluj region for nitrate removal. The effect of pH, conductivity, contact time, and nitrate concentration have been studied. The Langmuir and Freundlich models were used to fit the experimental data and these showed good correlations with the Freundlich model, providing a better description of the equilibrium (higher R2 value). Textural analysis was employed in order to determine the specific surface area, and pore size distribution of the used activated carbon and natural zeolite. The adsorbents (GAC and NZM) were characterized by using Fourier transform infrared spectroscopy and x-ray powder diffraction. © 2014 Balaban Desalination Publications. All rights reserved.

Farkas A.,Somes Water Company | Butiuc-Keul A.,Babes - Bolyai University | Ciataras D.,Somes Water Company | Neamtu C.,Somes Water Company | And 3 more authors.
Science of the Total Environment | Year: 2013

Biofilms are the predominant mode of microbial growth in drinking water systems. A dynamic exchange of individuals occurs between the attached and planktonic populations, while lateral gene transfer mediates genetic exchange in these bacterial communities. Integrons are important vectors for the spread of antimicrobial resistance. The presence of class 1 integrons (intI1, qac and sul genes) was assessed in biofilms occurring throughout the drinking water treatment process. Isolates from general and specific culture media, covering a wide range of environmental bacteria, fecal indicators and opportunistic pathogens were tested. From 96 isolates tested, 9.37% were found to possess genetic determinants of putative antimicrobial resistance, and these occurred in both Gram-positive and Gram-negative bacteria. Class 1 integron integrase gene was present in 8.33% of bacteria, all positive for the qacEδ1 gene. The sul1 gene was present in 3.12% of total isolates, representing 37.5% of the class 1 integron positive cells. The present study shows that biofilm communities in a drinking water treatment plant are a reservoir of class 1 integrons, mainly in bacteria that may be associated with microbiological contamination. Eight out of nine integron bearing strains (88.8%) were identified based on 16S rRNA gene sequencing as either enteric bacteria or species that may be connected to animal and anthropogenic disturbance. © 2012 Elsevier B.V.

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