scholarly journals Effects of Bahir Dar Textile Factory Effluents on the Water Quality of the Head Waters of Blue Nile River, Ethiopia

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abrehet Kahsay Mehari ◽  
Shewit Gebremedhin ◽  
Belayneh Ayele
Keyword(s):  
Water Quality ◽  
Total Alkalinity ◽  
Biotic Index ◽  
Nile River ◽  
Bahir Dar ◽  
Upstream Site ◽  
Blue Nile ◽  
Family Level ◽  
The Mean ◽  
Textile Factory

The study was conducted in 2013/14 with the objective of determining the effects of Bahir Dar textile factory effluents on the head of Blue Nile River water quality. Dissolve oxygen was higher at the upstream site of the river, whereas BOD5, TDS, and total alkalinity values were higher at wastewater outlet of the factory site. The mean values of dissolved oxygen, BOD5, and total alkalinity were above maximum permissible limits set by WHO for drinking water at head of Blue Nile River. The mean value of BOD5 was above permissible limit of IFC for textile effluents to be discharged to surface water. A total of 836 aquatic macroinvertebrate individuals belonging to 21 families were collected. The Shannon-Wiener Diversity Index, the Hilsenhoff family-level biotic index, family richness, and percent dipterans were calculated. Hilsenhoff family-level biotic index and percent dipterans metrics differed significantly among sampling sites(P<0.05). Hilsenhoff family-level biotic index was higher at the most downstream site but percent dipterans were higher at site of discharge of effluent to the head of Blue Nile River. Therefore, there is indication that effluent demands frequent control and proper treatment before being discharged to the environment.

scholarly journals Physico-chemical and biological evaluation of Blue Nile River at Lake Tana, Ethiopia, in relation to discharge of tannery effluent

2020 ◽  
Vol 13 (3) ◽  
pp. 185-195
Author(s):  
Mekdes Hone ◽  
Getachew Beneberu
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Biological Evaluation ◽  
Nile River ◽  
Tannery Effluent ◽  
Bahir Dar ◽  
Chironomid Larvae ◽  
Blue Nile ◽  
Low Dissolved Oxygen

Pollution of aquatic ecosystems with waste-water coming from tanneries is a serious challenge worldwide. The purpose of this study was to assess the water quality of Blue Nile River at a tannery in Bahir Dar, Ethiopia, using physicochemical and biological attributes. Four sampling sites were selected along the river based on the degree of degradation and major land-use types. Phyisco-chemical data, water samples, and chironomid larvae were collected monthly from March-May, 2016. Two liters of water were collected from each site and stored in the icebox and transported to Bahir Dar University. Water samples were analyzed for nutrients following standard procedures.  Chironomid larvae were collected using a D- Frame net of 500 µm mesh size. One-way ANOVA was used to compare variations in all measured parameters among the sampling sites. Low dissolved oxygen (2.8 mg/l) was recorded at the site where the tannery meets the river. Moreover, the concentration of soluble reactive phosphorus, SRP (25.5±14.3 μg/l) and conductivity (1907.3±39.5 µS/cm) were low in the most upstream site of the river. A total of six Chironomid genera belonging to the subfamilies Chironominae and Tanypodinae were identified.  The genus Chironomus dominated the impacted sites that had low dissolved oxygen levels. The other five genera were not found in those impacted sites. The result of this study indicated that the tannery effluent had impact on chironomid distribution as well as on river water quality.

scholarly journals Effect of Bahir Dar municipal effluents on water quality of the head of Blue Nile River

2016 ◽  
Vol 9 (2) ◽  
pp. 197
Author(s):  
Abrehet Kahsay Mehari ◽  
Shewit Gebremedhin ◽  
Belayneh Ayele
Keyword(s):  
Water Quality ◽  
Nile River ◽  
Bahir Dar ◽  
Blue Nile

scholarly journals Assessment of Water Quality of Blue Nile River in Sudan

2018 ◽  
Vol 1 (3) ◽  
pp. 1-14
Author(s):  
Rasha Babiker Gurashi Abu Sabah ◽  
Abubaker Haroun Mohamed Adam ◽  
Dawoud Mohamed Ali
Keyword(s):  
Water Quality ◽  
Seasonal Variation ◽  
World Health ◽  
Nile River ◽  
Blue Nile ◽  
Surrounding Environment ◽  
The World ◽  
Living Organisms ◽  
Health Organization

The objectives of this study were to quantify the fresh water quality of Blue Nile River before processing, identify the pollutants, and to determine the most polluted areas, and their impacts on living organisms as well as the surrounding environment. Thus, random water samples were collected and analyzed at the laboratory of the Ministry of Irrigation and Water Resources, Ground water and Wadis Directorates - Khartoum. The outcomes were compared with the World Health Organization standardization. The results revealed variations in the concentration of the studied elements taken from the different locations. But, the results indicated that the water quality is good, and it is within the permissible water use. However, further study is recommended to include seasonal variation as well as the biological analysis.

scholarly journals Evaluation of the Use of Some Benthic Macro-invertebrate Multimetric Indices Associations with Environmental Variables in Ecological Assessment of Some Ethiopian Rivers

2017 ◽  
Vol 20 ◽  
pp. 49-54
Author(s):  
Gezahegn Degefe ◽  
Girum Tamire ◽  
Seid Mohammed Hassen ◽  
Abinet Haile
Keyword(s):  
Water Quality ◽  
Ecological Status ◽  
Organic Pollution ◽  
Ecological Assessment ◽  
Biotic Index ◽  
Strongly Correlated ◽  
Upstream Site ◽  
Multimetric Indices ◽  
Biological Quality Elements ◽  
Poor Water Quality

The ecological status of six selected rivers which are found around central Ethiopia and North Shewa Zone and exposed to environmental stresses at varied extent, was studied using biological quality elements (BQE). One thousand one hundred thirty three (1133) individuals of macroinvertebrates, from 22 families and 5 orders of insects, were collected from the rivers. Seven metrics that had low correlation (p>0.05) were selected to calculate the final B-IBI and the result showed that both sites of Akaki, Sebeta and Jemma Rivers had poor water quality whereas Beresa, Chacha and Mojo (upstream site) had relatively better water quality. Canonical Correspondence Analysis (CCA) showed that Tabanidae, Syrphidae, Culicidae, and Canidae was more strongly correlated with temperature but strongly and negatively with pH, Dissolve Oxygen (DO) and Nitrate. The result implied that the change in abundance of these groups of macroinvertebrates could indicate the change in pH, DO and Nitrate. pH and DO were significantly (p < 0.05) and positively correlated with % Ephemeroptera and% Baetidae. On the other hand, DO showed strong but negative correlation % Oligochaeta, % Non-Insect and Hillsenhoff Family Biotic Index which implied that that the change in pH and level of organic pollution can be easily monitored using these metrics.HYDRO Nepal JournalJournal of Water Energy and EnvironmentIssue: 20Page: 49-54

scholarly journals Rapid Bioassessment of Magura haor (Floodplain wetland), Cachar District, Assam, India using Aquatic Insects

2015 ◽  
Vol 10 (1) ◽  
pp. 296-304 ◽  
Author(s):  
Arpita Dalal ◽  
Susmita Gupta
Keyword(s):  
Water Quality ◽  
Aquatic Insects ◽  
Rapid Assessment ◽  
Biotic Index ◽  
Floodplain Wetland ◽  
Four Seasons ◽  
Family Level ◽  
The Status ◽  
Water Quality Status ◽  
Rapid Assessment Survey

Investigation on the water quality of the floodplain wetland, Magura through rapid assessment survey using aquatic insects for the four seasons had been done during 2013-14. Aquatic insects were collected from the two sites and were identified up to family level. All together 5 orders (Hemiptera, Coleoptera, Odonata, Ephemeroptera and Diptera) and 21 families had been recorded from the wetland. 17 families from site 1 (Hemiptera- 7 families, Coleoptera- 4 families, Odonata- 3 families, Ephemeroptera- 1 family and Diptera- 2 families) and 18 families from site 2 (Hemiptera- 6 families, Coleoptera- 6 families, Odonata- 2 amilies, Ephemeroptera- 1 family and Diptera- 3 families) were recorded. Four family level biotic indices- SIGNAL 2, ASPT, BMWP and FBI had been used to determine the status of the water quality. According to SIGNAL 2 and BMWP scores it was moderately polluted, whereas ASPT showed doubtful quality but FBI proved very good (site 1) and good water condition (site 2). This study revealed that only one biotic index cannot give proper justification of the water quality status of a wetland.

scholarly journals Spatiotemporal Water Quality Assessment of Dumate Al-Jandal Lake (KSA) Using Environmetric Techniques

2018 ◽  
Vol 5 ◽  
pp. 412-437
Author(s):  
Mohammed Sharif Al-Sheraideh
Keyword(s):  
Water Quality ◽  
Descriptive Analysis ◽  
Lake Management ◽  
T Test ◽  
The Other ◽  
Multiple Comparison ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Significant Difference ◽  
The Mean

Environmentally, the objective of the study conducted in evaluating the spatiotemporal water quality asessment using some statistical techniques. Physicochemical characteristics determination applied on Dumate al-Jandal Lake, whether the analysis of water quality is good for agricultural irrigation or other ecosystem services.  Sampling and measurements were taken weekly at five sites started from February 2009 to January 2011. Descriptive analysis as well as the 95% confidence intervals, Wilks’ Lambda Statistics, MANOVA and ANOVA showed no presence of significant difference at the level of p < 0.05 among seasons and between sites, except the mean effect only for some parameter like Iron on the physiochemical parameters whereas a significant difference among the mean of physiochemical characteristics of water data to sites for the parameters like pH and nitrate, while there are no differences among the mean of physiochemical characteristics of water data of sites for the other parameters. Multiple comparison t-test shows the differences between means Sites of (1, 3) and (2, 5) as well as between (3) and (5) for the parameter pH.  Results showed a significant difference at (p < 0.05) between the means of Site (1) and all Sites (3, 4 and 5) as well as between Site (2) and (3) for nitrate,  but a significant difference at (p < 0.05)  among the mean associated with seasons for temperature, electrical conductivity, specific density, sulphate, nitrite, ammonia, chloride, total hardness, total alkalinity, manganese, magnesium and calcium hardness, while there are no differences among the mean of seasons for the other parameters. Whereas results of multiple comparison t-test showed that a differences between the means of season (i) and season (j), for each parameter. The study concluded that some of physicochemical parameters were reflected the presence of pollutants and absence of good ecosystem activities. To avoid seasonal pollution, water lake management are recommended.

New sensitivity grades for Australian river macroinvertebrates

2003 ◽  
Vol 54 (2) ◽  
pp. 95 ◽  
Author(s):  
Bruce C. Chessman
Keyword(s):  
Water Quality ◽  
Health Program ◽  
Assessment System ◽  
Local Context ◽  
Biotic Index ◽  
Government Agencies ◽  
River Health ◽  
Site Specific ◽  
Eastern Australia ◽  
Family Level

The SIGNAL biotic index for river macroinvertebrates, originally developed and tested in eastern Australia, was revised for application to the entire continent. Macroinvertebrate survey data from the National River Health Program were used to set grade numbers between 1 and 10 to represent the water-quality sensitivities of 210 taxa. Grades were assigned at the taxonomic levels customarily used by government agencies (predominantly family level) and by community groups (mainly order). A new index version using these grades, SIGNAL2, was correlated with water temperature, turbidity, electrical conductivity, alkalinity, pH, dissolved oxygen, total nitrogen and total phosphorus. Because of natural spatial variation in water quality, index scores need to be interpreted in a local context or against site-specific predictions generated by the Australian River Assessment System (AUSRIVAS).

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