[Evaluation of Aydughmush dam reservoir water quality by national sanitation foundation water quality index [NSF-WQI] and water quality parameter changes]

Aydughmush dam was built on Aydughmush River at 19km in southwest of Mianeh City. The dam is multipurpose and its main aims are the spring floods control, supplying potable water for villages and providing irrigation water. Different pollutants which probably discharge to the river finally enter to the dam reservoir so; this study focuses on evaluating the quality of the dam reservoir. In this cross sectional study standard field parameters including dissolved oxygen, temperature, Biochemical and chemical oxygen Demand, Most Probable Number of Coliforms, Fecal Coliform, Turbidity, Total Dissolved Solids, Total Solids, pH, conductivity and others were measured at eight different stations during the spring and summer in 2010. Sampling points were selected on the basis of their importance. Water quality index was calculated using water quality index calculator given by National Sanitation Foundation [NSF] information system. The highest value of WQI of the samples was 84.89 in A3 station in July while the lowest value was 67.96 in A2 station in May. The lower value of WQI has been found mainly due to the slightly lower value of DO in the dam reservoir water. Most of the water samples were found within Good category of National Sanitation Foundation Water Quality Index [NSF-WQI]. Comparison of the measured parameters based on the sampling stations and various months by variance and t-student analysis showed a significant relationship for some parameters[P<0.05]. Nutrient budget determination indicates that the concentration of phosphate, nitrite, nitrate and ammonia at inlet are higher than outlet of the dam reservoir. The calculated [WQI] showed good water quality. Based on the results of NSFQWI calculations, the dam reservoir water quality is suitable for various purposes

[Efficiency compare of both sonochemical and photosonochemical Technologies for cyanide removal from aqueous solutions]

Cyanide is a species of high toxicity that found mostly in industrial effluents such as electroplating, metal mining, metallurgy and metal cleaning processes. Entrance of it to Existence environment contains very health hazardous. Purpose of this study, efficiency compare of both sonochemical and photosonochemical technologies for cyanide removal from aqueous solutions. In this study, it has been used from a productive set of 500w power ultrasound waves in of two frequencies 35 kHz and 130 kHz and a 125 W low pressure mercury lamp. Experiments were performed at initial cyanide concentrations varying from 2.5 to 75 mg/L. in this study, The effects of parameters such as pH, time and initial cyanide concentration on the sonochemical and photosonic degradation have been studied. The results of the study showed that the maximum removal efficiency of cyanide had been achieved sonochemical technology was 71% while it was 74% by photosonic at frequency of 130 kHz, at time of 90 min, pH of 11 and initial cyanide concentration of 2.5 mg/l. The results of the study showed that efficiency of photosonic process is more than for sonochemical cyanide removal from aqueous solutions. Also efficiency of cyanide removal has direct relationship with pH, frequency and time, and it has reverse relationship with cyanide concentration for both processes