Evaluation of microbial contamination of Nawrood River to E. coli and Coliform bacteria based on global standards

Surface water resources, especially rivers, have long been used for agriculture and agriculture. Today, due to the mechanization of the cultivation process, the expansion of agronomy of cultivation and industry, the unnecessary use of pesticides and pesticides, as well as the expansion of industrial centers and production units around rivers, the pollution and their microbial contamination have increased dramatically. Limitation of underground water resources and the increasing need for water resources, especially water resources, monitoring needs and updated control systems along with periodic sampling and analysis to assess the physical, chemical and biological changes of water resources and microbial load control Concentrated and carriers in the rivers. In this research, the concentration of two bacteria of Escherichia coli and Kelifram, which are indicators of water pollution to human wastewater, is investigated in the Nervod River, one of the largest and most rivers in the southwestern basin of the Caspian Sea, passing through the city of Asalem Weve been. For this purpose, six sampling stations ((from each of the 3 districts of the city, 2 stations), with a total length of 15 km, were selected in the districts of Varje valley, Khordgol and Isalem, and sampling them in two seasons of spring and summer 1396 One sample per month. The findings indicate an increase in the river's microbial load in the spring and its decrease in summer. Also, by comparing the results of the analysis with global standards, the water of the Nawarud River has a microbial load below the global standard and for use in non-drinking Direct and unpolluted.