توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Assessment of weirs in dissolve oxygen (DO) level in Kor River
نویسنده(ها): ،
اطلاعات انتشار: پنجمین کنگره ملی مهندسی عمران، سال
تعداد صفحات: ۵
Kor River is one of the main rivers in Fars province, Iran. Because the Kor River is polluted as a result of urbanization and industrialization, the biochemical oxygen demand (BOD) concentration was increased. Consequently, dissolve oxygen (DO) was decreased. It is necessary to use versatile water quality models to asses the DO concentration and make policies for pollution control. Several weirs are located along the Kor River to distribute agricultural water to adjecent farms. These weirs enhance reaeration so that DO levels increase along the river. According to the DO profile, there occurs a large decay of DO in the lower half of downstream of Kor river, between 75 and 13 km, caused by the increased discharge of municipal and industrial pollutants.To determine how much weirs affect DO levels, another model without weirs was constructed. It shows an increase of DO deficient regions, located between 79 and 2 km. To improve present situation, three extra weirs added to the existing model. It shows that level of DO, to some extend increased but, would not achieve to standard level, 4 mg\l.<\div>

۲Study of pollutants and participation of pollution sources in the Sivand River
نویسنده(ها): ،
اطلاعات انتشار: پنجمین کنگره ملی مهندسی عمران، سال
تعداد صفحات: ۷
The Sivand River Originates from the southern heights of Eghlid City and joins Kor River at the Khan Bridge, and eventually, pours into Tashk and Bakhtegan Lake after 310 Kms. In this study, we were able to estimate quantity of each of the pollutant sources and by dividing amounts of pollutant load to total load we calculated participation of each pollutant. The study, shows that Sivand River is mostly affected by the residential discharges and many food processing industries such as Yek–O–Yek factory along side the river and the municipal waste discharge from the Marvdasht City.<\div>

۳Factorial experimental design as a tool for screening the factors affecting Pb2+ and Ni2+ adsorption
نویسنده(ها): ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
Metal adsorption efficiency may be influenced by many operating conditions. It would be useful for the understanding of the complexity of adsorption systems to know the interactive effects of the factors involved. In this study 24 full factorial design experiments were used to screen the factors affecting the Pb2+ and Ni2+ removal efficiency using modified walnut shell. In factorial design experiments, four factors pH, adsorbent dose, initial concentration of metal ions and temperature were varied at two levels. Using the experimental results, a linear mathematical model was obtained. The adsorbent dosage was found to have the most significant influence on the Pb2+ removal efficiency. However for Ni2+ uptake, solution pH was the most important parameter.<\div>

۴Adsorption of Ni(II) ions using modified walnut shell: Factorial design analysis
نویسنده(ها): ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۹
The removal of Ni(II) ions from aqueous solutions by chemically modified walnut shell was studied .A 24 full factorial design analysis was performed to screen the variables affecting Ni(II) removal efficiency. The effects of individual variables (solution pH, adsorbent dose, initial concentration of Ni(II) ions, and temperature) and their interactions on metal removal efficiency were examined in a batch system. Using the experimental results, a linear mathematical model representing the influence of variables and their interactions was obtained. Analysis of variance (ANOVA), F–test and Student’s t–test showed that Ni(II) ions adsorption is strongly pH dependent and metal removal markedly increased with this factor. Adsorbent dose, initial metal concentration, temperature and interaction of solution pH and initial metal concentration also had positive effects on Ni(II) adsorption. Maximum removal efficiency of Ni(II) by modified walnut shell was 95.6% and corresponded to the values of: pH = 9, adsorbent dose = 20 g\L, initial metal concentration = 90 mg\L, and temperature = 45°C.<\div>
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