H. R. Nassery; Z. Kayhomayoon; M. Nakhaei
Abstract
Hydrochemical properties of water resources in Lenjanat plain and the effect of natural and anthropogenic factors have been determined. For this purpose, 162 water samples including groundwater, surface water and industrial wastewater seasonally in 1387 were collected. The results of field and laboratory ...
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Hydrochemical properties of water resources in Lenjanat plain and the effect of natural and anthropogenic factors have been determined. For this purpose, 162 water samples including groundwater, surface water and industrial wastewater seasonally in 1387 were collected. The results of field and laboratory measurements of physicochemical parameters, major, minor and trace elements show that the high EC (561-11390 μS/cm) in groundwater is due to high concentration of major elements (Na, Ca, Cl and SO4). Specific elements of evaporates and carbonate deposits (B, Ba, Br, Sr, I and Li) are higher concentrations than the other minor and trace elements measured in the aquifer. Cumulative Distribution Function (CDF), hydrogeochemical graphs, certain ratios and saturation index from geochemical modeling indicates that the dissolution of evaporation deposits (halite and gypsum) and cation exchange are the most important processes affecting the chemical composition of groundwater. The results of applying statistical techniques (factor and cluster analysis) confirmed water/rock interaction in the aquifer and show the effect of human activities on groundwater quality by increasing NO3 ion. Concentration of nitrogen compounds and the presence of bacteria indicate the impact of agricultural, industrial and domestic wastewater on the Zayandehrud River. Industrial sewage has no affect on groundwater quality.
H. R. Nassery; F. Alijani; M. Nakhaei
Abstract
To determine the ground water potential of the karst aquifers, in the southwest of Izeh, three profiles and 62 vertical electrical sounding (VES) conducted by Schlumberger array, eight profiles were performed using dipole-dipole configuration, and 3-D configuration applied in two sites. However, Schlumberger ...
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To determine the ground water potential of the karst aquifers, in the southwest of Izeh, three profiles and 62 vertical electrical sounding (VES) conducted by Schlumberger array, eight profiles were performed using dipole-dipole configuration, and 3-D configuration applied in two sites. However, Schlumberger tomography with high investigation depth (about 180 m) may be shows the different zone of karst aquifer but because of 50-100 m of VES spacing has not the detectability of cavities with lower than 50 m diameter. The results show that Ilam-Sarvak limestone is similar to hard rocks while Asmari formation has been identified as developed karst with high matrix porosity. The results in the 2-D geoelectrical tomography using a dipole-dipole configuration, shows that, compared to an electrode spacing of 5 m, an electrode spacing of 1 or 2 m has a higher ability to delineate karst voids. Because of the higher depth of the investigation, however, the longer electrode spacing allowed obtaining a comprehensive insight of different parts of karst regions. The high resolution 3-D electrical tomography has a good ability to detection of geological features and karst voids. The geoelectric results and interpretation of tomograms have been asserted by drilling success of four wells with high yield at Asmari formation and two wells with moderate yield at Ilam-Sarvak formation.
S. Orandi; A. Yaghubpur; M. Nakhaei; B. Mehrabi; H. Sahraei; M. Behrouz
Abstract
Sarcheshmeh Copper Mine, one of the well known porphyry copper deposits, is located in 55 km south of Rafsanjan, south-eastern Iran. Metalliferrous deposit mining, prepare proper conditions for oxidation of sulphide minerals and acid mine drainage will be produced easily by chemical reactions between ...
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Sarcheshmeh Copper Mine, one of the well known porphyry copper deposits, is located in 55 km south of Rafsanjan, south-eastern Iran. Metalliferrous deposit mining, prepare proper conditions for oxidation of sulphide minerals and acid mine drainage will be produced easily by chemical reactions between metal sulphides and water, with the presence of air. Investigations on impact of waste dumps on producing acid mine drainage at Sarcheshmeh copper mine shows decreased pH up to 3-5.5 in acid drainages with the presence of some dissolved toxic and heavy metals higher than permitted standard limits (WHO). In such degraded water and improper environment for aquatic life, just some of microorganisms are able to survive. At Sarcheshmeh copper mine in some of acidic drainages which maintain high dissolved elements, an acid tolerant alga recognized. The genus of this filamentous green alga is Ulothrix and species is Ulothrix gigas without antimicrobial and antifungal properties. The alga is observed in the drainages with high dissolved solids (TDS≈1800mg/l). It seems pH values, type of dissolved elements and secondary minerals formed on the substrate, are important factors in distribution of Ulothrix. This research shows the most prolific and densely populated communities occur in effluent with the pH 3- 4.5. The colloidal conditions and presence of suspended Iron and Aluminium prevent growth or reproduction of them. Sampling and chemical analysis of algae show elevated absorption of heavy metals. Therefore the presence of this alga is a factor to remove heavy metals from acid mine drainage naturally and improve the water quality.
F. Fayazi; M. Nahkaei; R. Lak
Abstract
Maharlou lake located in southwest of Iran is an intra-continental sedimentary basin. Its area is about 280 km2 extended with an average water depth of 1.5 m during wet seasons. The water level in the lake is controlled by several factors such as runoff volume from Maharlou catchment, ...
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Maharlou lake located in southwest of Iran is an intra-continental sedimentary basin. Its area is about 280 km2 extended with an average water depth of 1.5 m during wet seasons. The water level in the lake is controlled by several factors such as runoff volume from Maharlou catchment, underground water seepage, and direct rainfall over the lake and also evaporation. Generally, hydrochemical analysis of water resources showed that the water types are mainly bicarbonates and sulfates due to geology of the surrounding areas. Hydrochemical investigation has been carried out for a time period between 1975 and 2002 using previously published analyses together with new collected water samples. 230 samples were collected during summer 2001, summer 2002 and spring 2005. Results show a change in the brine type through time; with an Mg-SO4-Cl type in 1970 to an Mg-Cl-SO4 type in 2001 and currently Na-Mg-Cl brine type, in recent time, which is comparable with Great Salt Lake in USA. Due to changes in diluted water compositions from HCO3 ≥ (Ca + Mg) to HCO3 (Ca + Mg), the path of brine on the Eugster and Hardie flow diagram changes from row III to the path II, indicating that the bicarbonate water comes into the lake from a fault occurring in the lake floor.
