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Application of Water Quality Index for Quality Zoning •Arch Hyg Sci 2012;1(1):20-25 RESEARCH ARTICLE •Journal homepage: http://jhygiene.muq.ac.ir Application of Water Quality Index for Quality Zoning Emad Dehghanifarda, Mohammad Mehdi Baneshib, Gagik Badalians Gholikandic*, Ali Dehnavid, Ali Reza Asgarie, Mohammad Khazaeie, Ahmad Reza Yarif a Department of Environmental Health Engineering, School of Public Health, Alborz University of Medical Sciences, Karaj, Iran. b Department of Environmental Health Engineering, School of Public Health, Yasuj University of Medical Sciences, Yasuj, Iran. c Department of Water and Wastewater Engineering, Power & Water University of Technology, Tehran, Iran. d Department of Environmental Engineering, School of Civil & Environmental Engineering, Tarbiat Modares University, Tehran, Iran. e Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran. f Department of Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran. *Correspondence should be addressed to Dr. Gagik Badalians Gholikandi; Email: [email protected] A-R-T-I-C-L-E I-N-F-O A-B-S-T-R-A-C-T Article Notes: Aims of the Study: The physical, chemical and biological characteristics of Karaj Received: Mar 17, 2012 River (near the city of Tehran, Iran), has been studied to evaluate the suitability of Received in revised form: Jul its water for domestic uses. 17, 2012 Accepted: Jul 30, 2012 Materials & Methods: Samples of water were collected from various localities Available Online: Sept 2, before, in and after Karaj Dam Lake and were analyzed based on needs for Water 2012 Quality Index (WQI) calculation. In this study, WQI were calculated for the best and the poor condition for quality zoning determination of Karaj water quality. Keywords: Results: Comparison of water quality index in different sampling stations of Karaj Alborz Province, Karaj, Iran River in different years showed that the water quality of this river was better in Lakes, Karaj Dam 2008 compared with years 2007 and 2009; however ANOVA analysis showed no Quality Control significant difference between the data in these years (p <0.05). Quality Zoning Rivers, Karaj Conclusions: The range of water quality was different from medium to good Water Quality, Assessment (WQI=50-100), so this water can be used for domestic uses after suitable Water Quality, Index treatment. Please cite this article as: Dehghanifard E, Baneshi MM, Badalians Gholikandi G, Dehnavi A, Asgari AR, Khazaei M, Yari AR. ApplicationArchive of water quality index for quality zoning of. Arch Hyg SciSID 2012;1(1):20-5. Several water quality indices have been Background developed to evaluate water quality. Some of the water quality indices that have been River water is the major source for many frequently employed in public domain for the activities such as drinking, and agricultural and purpose of water quality assessment are the industrials uses. National Sanitation Foundation Water Quality Due to increasing industrialization and Index (NSFWQI), British Columbia Water urbanization, river water pollution is becoming Quality Index (BCWQI), Canadian Water severe problem. So some tools must be Quality Index (CWQI), Oregon Water Quality developed to keep watch on such pollution (1). Index (OWQI), and the Florida Stream Water ---------------------------------------------------------------------------------------------------------------------------------------- Archives of Hygiene Sciences Volume 1, Number 1, Summerwww.SID.ir 2012 © 2012 Publisher: Research Center for Environmental Pollutants, Qom University of Medical Sciences. All rights reserved. 20 •Application of Water Quality Index for Quality Zoning Dehghanifard E, et al./ Arch Hyg Sci 2012;1(1):20-25 Quality Index (FWQI). Among them, the and Jajrood Rivers and from groundwater NSFWQI has been the forerunner of many resources. At present, about 60% of drinking indices and its methodology continues to be water supplies are provided by Karaj, Latyan adapted (2). and Lar dams near Tehran (4). Thus, Karaj Water quality Index is simpler and River is the most important source of water convenient tool to express quality of water. It supply for Tehran Province. gives immediate idea about pollution of the Karaj River: Karaj River, one of the most water body. Such WQI will give idea important rivers of central watershed, is located concerning increase or decrease in pollution in the northwest of this watershed and is one of rate for the water body under consideration. the most important rivers of Iran. Monthly, seasonal or yearly changes in the The most flow of Karaj River and its water quality can be quickly assessed with help branches is applied for agricultural, municipal of such Index (3). These changes may be used and industrial uses of Tehran Province for a fixed point during time or for various (including Tehran, Karaj, Damavand, Varamin points in the fixed time. and Shahriar), and the remaining flow enters to Karaj River, the most important drinking Qom Salt Lake. The Karaj surface watershed water resource of city of Tehran has faced encompasses more than 5000 km2 with annual many environmental accidents and problems, so average precipitation of 700 mm. its water quality may be degraded. It is obvious Data collection: In this research, some that river quality has changed between the best physicochemical and bacteriological data, and worst range of quality condition. routinely experimented each month by Tehran The quality zoning and level determination Water and Wastewater Company, were used to of rivers allow experts to make a proper evaluate the water quality and quality zoning of decision for best and worst quality condition of the Karaj River. These data consisted of 9 considered rivers. In the other words, quality parameters, based on WQI method as follows: zoning could demonstrate maximum and • Dissolved oxygen (DO), minimum quality changes of river in each • pH, station during a year and proper decisions could • Biochemical oxygen demand (BOD5), predicted for critical quality conditions. • Temperature (To), Aims of the Study: In this study, water • Turbidity, quality of Karaj River before and after Karaj • Total solids (TS), dam and its lake has been assessed using WQI • Nitrate (NO3), method to determine water quality of this river • Phosphate (PO4), after and before dam, role of lake in pollution • adjustment and determine the water quality in Fecal coliform (FC) bacteria. Archive ofAll samples SID were analyzed in accordance maximum and minimum value in various points and in various years for quality zoning with American Public Health Association (APHA) methods (5). determination. For this reason, after data collection and analyzing, WQI was calculated To monitor water quality, Tehran Water and Wastewater Company has selected 20 stations and draw for minimum, average and maximum data in length of river (1). along Karaj River but we used only 12 stations in this study due to their importance for pollutants entrance and more complete data. Materials & Methods Analyses and water quality data interpretations of this river were carried out in a Site Specification: Water supply for period of three years (from April 2006 to March Tehran's residents is supplied from the Karaj 2009) and were applied by WQI index ---------------------------------------------------------------------------------------------------------------------------------------- Archives of Hygiene Sciences Volume 1, Number 1, Summerwww.SID.ir 2012 © 2012 Publisher: Research Center for Environmental Pollutants, Qom University of Medical Sciences. All rights reserved. 21 Dehghanifard E, et al./ Arch Hyg Sci 2012;1(1):20-25 •Application of Water Quality Index for Quality Zoning calculator and Excel software. Data of this period were available monthly except in spring Table 2) Colors and definitions for Water Quality and summer of 2007 that were seasonally. Index (WQI) To provide a standardized method for the Color WQI Definition NSFWQI, 142 Iranian researchers in the water Red 0-25 very bad quality field surveyed about 35 parameters. In Orange 26-50 bad the final form, NSFWQI relied on nine Yellow 51-70 medium parameters: DO, fecal coliform bacteria, pH, Green 71-90 good biochemical oxygen demand (BOD5), temperature, total phosphate, nitrate, turbidity, Blue 91-100 Very good and total solids (2, 6). In NSFWQI method, values ranges from 0–100 and waters are classified as very bad (0-25), bad (25-50), Results medium (50-70), good (70-90), or excellent (90-100). Based on parameters of WQI of considered Data analysis: In WQI calculation, stations and specific software for sub-index and weighting averages of parameters required for WQI calculation, the best and worst quality WQI should be calculated, and then sub-index condition of Karaj River from April 2006 to of each parameter must be determined based on March 2009 were determined (Table 3). By specific charts and, finally WQI of each using these results, the quality zoning of Karaj sampling point determined by multiplying sub- River during studied time is applicable. index to weighting average of each parameter. The most important sampling station in Table 1 shows weighting factor and WQI Karaj River is station No. 12 (Bilaghan) that calculation of each parameter. In Table 2, supplies drinking water of Tehran. The water different water quality ranges have been quality index in this station was not reduced categorized by different colors (7, 8). less than average and was not increased more The Calculating NSF Water
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