اسم المؤلف:
افراح طعمة خلف مطر البدري
اسم المشرف:
حميد سلمان خميس المهداوي | ياسين حسين عويد
المستخلص:
تضمنت هذه الدراسة اختيار خمس محطات اربعة منها على نهر دجلة المار بمدينة سامراء بعد جسر سامراء والمحطة الخامسة والتي تمثل رقم 2 على مياه مجاري سامراء قبل ان تصب في مياه نهر دجلة.وقد تم اخذ العينات للمدة من شهر تشرين الاول 2010 حتى نهاية شهر ايلول 2011 وقد | The study included chosen five stations for water sampleing, four of them at Tigris river while the fifth station was chosen at samara sewage before meeting with Tigris river.Samples were collected monthly started from October 2010 until the end of September 2011. The study included the study of some physical, chemical and biological characteristics for river water and sewage and noticed the effects of sewage water on quality of these water in Tigris River, these characteristics clued in air , water temperature, electrical conductivity, pH, total dissolved solid, Total Suspseneded solid, dissolved oxygen(Do), biological oxygen demand (BOD), total hardness, calcium and magnesium hardness, chloride, alkalinity, nutrients concerteration, ( phosphate, nitrate) in addition the total number of bacteria and coliform bacteria.Water Temperature ranged through out the study ranged between (5° - 35°), while air temperature ranged between(5° - 38°) , Electrical Conductivity in the river ranged between (280 - 1480) mc/cm, where in sewage the electrical conductivity ranged between(1200 - 2180) mc/cm, while pH value tened to be slightly alkaline, it show very close value where ranged between(5.3 - 8.8). It was noticed that the pH value tened to be slightly acidic from January to August 2011. The results also show that the water were in good airation where the value of dissolved oxygen ranged between (3 - 10) mg/L in station one and stations five while the value of dissolved oxygen in stations two and three range between (2 - 6.5) mg/L.The result also showed that the concentration of total suspended solids ranged between(20 - 798) mg/L. where it has high value in April in all stations, this propably due to increase of discharge of the river which accompanied by suspended solid, while the dissolved solids in all station range between (250 - 1470) mg/L.The highest value recorded were, 1470 mg/ L on May 2011in station two.The value of total hardness for Tigris river ranged between hard to very hard(125 - 360) mgCaCO3/L in station one, four and five, whereas its value in stations two and three ranged between (200 - 925) mg/L. Calcium ion which is the cause of calcium hardness was higher than magnesium cencenrteration which is responsible of magnesium hardness, where calcium hardness ranged between (75 - 587.5) mg/ l and magnesium hardness ranged between (5 - 500) mg/l. chloride concentration ranged between (8 - 127.5) mg/l in all station, chloride cencetration in stations one, two, and five were in the allowable wnorld limit(8.5 - 68) mg/l. Alkalinity results showed that it related to carbonate and bicarbonate, and its ranged between (110 - 900) mg/l.While phosphate value ranged between(0.0106 - 1.999) µg atom - PO4/L, the lowest values were recorded in Tigris river, While the high value recorded in sewage station two, while nitrate value were fluctuated in all stations but the high value recorded in the second station is ranged between (0.0103 - 1.140) µg atom NO3/l. Result of microbiological study shown that there is high number of bacteria the average of total count of bacteria were(39.7×105، 17.31×105، 267× 105، 3.17 ×105، 0.0531×105) cell/ ml for all stations respectively, so it has been suggested that the water in Tigris river considered as polluted to very polluted while the resulty of Coliform bacteria were very high and the average number for all stations respectively as follows (209 × 105, 9809×105 , 25× 105, 1×105, 0.004×105 ( cell /ml According to these result the water is not suitable for direct drinking.Statistical analysis for most factors studied show significant differences between station one and station two and between station one and station three as well in stations four and five and there is no significant differences between station two and station three.
