توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Efficiency Evaluation of Powdered Activated Carbon as Coagulant aid in Ahvaz Water Treatment Plant
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش بین المللی بحران های زیست محیطی ایران و راهکارهای بهبود آن، سال
تعداد صفحات: ۵
In recent decades, increasing pollution of water resources has caused higher rates of organic pollutants in water resources. Considering the surface water resources as one of the main water supplies in many regions of Iran and the application of chlorination for disinfecting drinking water has increased the rate of disinfection By–Products (DBPs) formation. Trihalomethanes (THMs) as the main group of DBPs are categorized and considered to have the potentiality of increasing the rate of liver, kidney and CNS adverse effects.This study which presents experimental results, aimed at the reduction of organic matters by the use of powdered activated carbon (PAC) in the process of coagulation in Koot Amir water treatment plant in Ahwaz city, the affection of two coagulant such as Ferric chloride and Poly aluminum chloride (PACl) with PAC in removing Total Organic Carbon (TOC) considering different elements such as concentration and the kind of coagulants, concentration of PAC, pH changes and contact time has been surveyed. The results of this study clearly indicated that maximum removal in optimum pH of Ferric Chloride has been 40% while 44 percent TOC removal has been achieved at pH 6.5 for Poly Aluminum Chloride coagulant. In use of powdered activated carbon with optimum pH and concentration of Ferric Chloride, TOC reduction will increase with increasing PAC concentration and will be 90 percent. Also the increase of powdered activated carbon in similar conditions along with Poly Aluminum Chloride 87 percent reduction has been occurred.<\div>

۲Efficiency of the chitosan as natural coagulant with PAC in removing turbidity from Municipal water treatment plant (case study: Ahvaz water treatment plant)
نویسنده(ها): ، ،
اطلاعات انتشار: کنگره بین المللی پایداری در معماری و شهرسازی معاصر خاورمیانه، سال
تعداد صفحات: ۱۸
Karun River is the largest and most watery river in Iran. This river is the longest river which located just inside Iran and Ahvaz Metropolis drinking water supplied from Karun River as well . Karun River as the main source of water treatment plants in Ahvaz, like most surface waters affected by various contaminants which caused changes in water quality of the river .Chitosan is a biodegradable cationic polymer derived from the deacetylation of chitin. This study aims to investigate the effects of chitosan as a coagulant aid for the improvement of a polyaluminum chloride coagulant in removing the turbidity from drinking water. This study was conducted in the laboratory using a jar test in the water treatment plant of Ahvaz, Iran. Experiments were conducted based on various variables such as concentration of coagulant, pH, and different concentrations of chitosan as a coagulant aid. After preparation in a jar test, samples were mixed fast at 120 rpm for 1 min and slowly at 30 rpm for 15 min and remained under stable conditions for 30 min to allow for settlement. The optimal pH for the removal of the turbidity was pH 8. The optimal dosage of polyaluminum chloride combined with chitosan was 5 and 0.02 mg\L, respectively. Under optimal conditions, the use of chitosan could reduce the concentration of polyaluminum chloride by approximately 50%. The investigation showed that the optimal concentration of PAC for turbidity removal was 10 mg\L. When the PAC concentration was adjusted to 10mg\L, adding 0.02mg\L of chitosan to the process, maximum turbidity removal was achieved at 99.16%. In addition, particles formed in flocculation by chitosan were coarser and settled faster. Results indicated good performance of chitosan as a coagulant aid for the removal of the turbidity from drinking water.<\div>
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