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Article
Effect of daily variations, diurnal fluctuations and tidal stage on water parameters of East Hammar marshland, Southern IRAQ .

Author: N. A. HussainandM. A. Taher
Journal: Marsh Bulletin مجلة الاهوار ISSN: 18169848 Year: 2007 Volume: 2 Issue: 1 Pages: 32-42
Publisher: Basrah University جامعة البصرة

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Abstract

Water parameters of East Hammar marshland were measured during July 2006 in several sites .Spatial and temporal variations existed between the six sites sampled. Water temperature , salinity, conductivity ,total dissolved solids (TDS) and pH values were higher in flood tide ,on contrary dissolved oxygen, oxidation and reduction optional ( ORP )and flow rate were higher during ebb tide . Values of air ;water temperatures ,Salinity,conductivity ,TDS and pH showed increasing trend as time progressing toward mid day, others decrease like dissolved oxygen ,ORP and transparency . Flow rate was faster during ebb than flood. Water level increased with flood tide. Time of the day and tidal stage have pronounced effect on several water parameters and must betaken in consideration during sampling.

Keywords

TDS --- ORP --- Salinity --- transparency --- Hammar marshland


Article
The oxidation reduction potential distribution along Diyala river within Baghdad city

Authors: Safaa Nasser Hassan Al-Hussaini --- Adnan Abbas Ali Al-Samawi
Journal: Mesopotamia Environmental Journal بيئة وادي الرافدين ISSN: 24102598 Year: 2016 Volume: 2 Issue: 4 Pages: 54-66
Publisher: Babylon University جامعة بابل

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Abstract

The reach of the Diyala river just before its confluence with Tigris River south of the capital city Baghdad was taken as a case-study. Its aquatic physicochemical characteristics were investigated and its pollution status was assessed in this study according to ORP (oxidation reduction potential) levels and other parameters. This segment of Diyala river was exposed to multiple points of treated and raw municipal waste water discharges, represented by the outfalls and bypass of three wastewater treatment plants of Al-Rustimiyah.Diyala River's aquatic parameters represented by DO, BOD, COD, ORP, pH, and others were monitored and measured at nine stations along the river reach for a period of one year to assess seasonal variations. It was found that station two, which lies downstream the bypass of R3, was the most polluted station among all.With regard to the ORP concentrations, the river was classified as anoxic conditions during winter to anaerobic conditions during summer from station two and downstream. Furthermore, it has been reached that the strong odor observed on site especially during summer, might be attributed to the formation of acid and methane production that goes with the obtained low levels of ORP.The COD and BOD5 levels classified the river as medium to low strength untreated wastewater during summer at station two and the downstream stations respectively.The effect of temperature on DO and ORP was found to be reversed, while a positive nonlinear relation combined the DO concentrations with ORP levels.The COD/BOD ratio of the river was found to be 1.2, which indicates the presence of biodegradable matter at high concentrations.A statistical model relating DO concentration to BOD, ORP, EC and temperature was established. It was proved to be accurate.To sum up, Diyala River at the reach of interest was found heavily polluted. The need for an urgent makeover of the water body characteristics of the river via mechanically assisted methods was found necessary to restore its original usages and ensure public health safety.

Keywords

Diyala River --- ORP --- DO --- COD --- BOD --- Temperature


Article
Photocatalytic activity of Fe3O4 under solar radiation

Authors: Riyad Al-Anbari --- Abdul Hameed Al-Obaidy --- Eman Abd
Journal: Mesopotamia Environmental Journal بيئة وادي الرافدين ISSN: 24102598 Year: 2016 Volume: 2 Issue: 4 Pages: 41-53
Publisher: Babylon University جامعة بابل

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Abstract

Decolorization of red azo dye (Cibacron Red FN-R) in simulated wastewater has been investigated as a function of solar photocatalytic process by using Fe3O4. Different parameters that affected on the removal efficiency, such as influent dye concentration, pH of dye solution, catalyst dosage, and H2O2 concentration, all these factors were evaluated to find the optimal operation conditions. Additionally, pH, ORP (oxidation reduction potential) and Ec (electrical conductivity) of the solution was monitored to assess the degradation of dye. From the experimental results, the desired pH value for solar photocatalytic Fe3O4 was 6.5 and the best catalysis dosage was 300mg/L. In addition, the most efficient H2O2 concentration was 200 mg/L for Fe3O4.The mathematical models that describe the photocatalytic process have been predicted by using response surface methodology (RSM). The decolorization efficiency of reactive red dye using Fe3O4 under solar radiation was around 85.51%.

Keywords

photocatalysis --- Fe3O4 --- azo dye --- ORP --- reactive red.

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