Evaluation of Corrosion Agents in Tabriz Drinking Water Supply Network

Water is necessary for the life and its important role in the survival of animal and plants are well-informed for everybody. We should responsible for the agents that impact on the quality of drinking water supply. Corrosion of water supply pipelines is one of the major concerns in the management of water distribution and treatment facilities and cause health problems and increases the cost of system maintenance. In this way many of researchers have investigated the methods of determining water potential in the decomposition of water supply installations. Some of the water distribution parts in Tabriz were selected in coordination with water and wastewater company branch in Azarbayjan shargi. Water samples were collected according with procedures issued in water and wastewater analyzing standard methods to determine the corrosion potential of water. The results of water samples analysis shows that average of pH, sulfate, carbonate, chloride, TDS and turbidity were 7.9, 25.9, 0, 149, 529, 1.1, mg/l respectively. Inspection of water distribution network indicated that most of pipelines are made from cast iron and in some reign constructed with polyethylene. Chemical properties of the water were the major reason in the corrosion of water supply network system related to lower level of water hardness. Langelier Saturation index (LSI) was rarely about precipitation range and scaling is occurring in the pipelines. Water scaling causes the corrosion of ducts and an introduction to the beginning of water related health problems due to infiltration of exterior polluted water into the water network. With practical policies it is possible to overcome on this problem and reduce of the water scaling in the Tabriz water distribution system. With proper management principals it is possible to dissolve water quality problems in Tabriz.