Water Quality Assessment in Terms of Water Quality Index (WQI): Case Study; Gorganroud River, Golestan Province, Iran

Abstract

The most important aquatic ecosystems are freshwater rivers, which are considered as biodiversity and drinking water. In this regard, the quantitative and qualitative study of these resources is an important pillar of sustainable development. Gorganroud is one of the most important rivers in northeastern Iran; therefore the aim of this study was to study survey of Gorgnroud River water quality in Golestan Province using Water Quality Index (WQI). For this purpose, five sampling stations were selected along the Gorgnroud River, and samples were taken from April to August of 2015 every 45 days at sampling stations. The parameters of dissolved oxygen, nitrate, nitrite and PH were measured at each turn and the data were analyzed by WQI qualitative index. The results showed that the Water Quality Index at the first station (91/22); at the second station (85/51); at the third station (89.30); at the fourth station (87/14) and fifth station (81/11). The water quality index indicates that water quality of the Gorgnroud River was in a very good quality class during the spring and summer seasons.

Using GIS and Remote Sensing Techniques to Study Water Quality Changes and Spectral Analysis of Tigris River within Mosul City, North of Iraq

“…In general, the models show decrease in trends of chlorophyll-a quantities and an increasing of Secchi disk depth. In the case of sample points P7 and P10, decreasing amounts of chlorophyll-a appear at 2016 and 2017 and the Secchi disk depths decrease too, the opposite results as shown in Figures- (5,6) and Table-(2,3) can be related to the dissolved organic compo funds that change water color and non-algal particulates such as clay or sand [17]. In 2018 the amounts of chlorophyll-a increasing than the rest of the years and the green and red bands were constant in autumn compared to the rest of the year and a similar difference was found in the NIR band for summer and winter.…”

“…Nevertheless ,the quality of water in many large rivers has deteriorated throughout the world by increasing human activity in the past two or three decades [1,3,4]. The most common method used to measure the quality of surface water (river, lake, and ocean) is the use of water quality [5,6]. This is due to the introduction of many pollutants into aquatic ecosystems, in addition to ecological values, which are of high economic importance and their health value is of great importance [5,7].…”

“…The most common method used to measure the quality of surface water (river, lake, and ocean) is the use of water quality [5,6]. This is due to the introduction of many pollutants into aquatic ecosystems, in addition to ecological values, which are of high economic importance and their health value is of great importance [5,7]. The most important aquatic ecosystems are freshwater rivers, so the quantitative and qualitative study of these sources is an important pillar of sustainable development [5,8].…”

“…This is due to the introduction of many pollutants into aquatic ecosystems, in addition to ecological values, which are of high economic importance and their health value is of great importance [5,7]. The most important aquatic ecosystems are freshwater rivers, so the quantitative and qualitative study of these sources is an important pillar of sustainable development [5,8]. The study of the characteristics and behavior of the rivers is difficult, complicated and expensive.…”

The Effect of Scale on the Performance of an Integrated Poultry Slaughterhouse Wastewater Treatment Process

“…Monitoring and reporting the efficiency of a wastewater treatment plant is essential. One of the widely used methods for presenting water quality data is the water quality index (WQI) approach [24][25][26]. A WQI is a summary of different water quality parameters, resulting in a single unitless number [27,28].…”