نقش نيروگاه نكاء در آلودگي درياي خزر

The Effect of Nekaʹs Power Plant in Pollution of Caspian Sea

Effluent of power plantʹs boilers always contains som elements such as Al, Ca, Co, Mg, Cr, Cu, Fe, Si, Mn, Mo, Na, Ni, K, V and Zn. This is due to chemical cleaning and recycling of water and consequent corrosion. Discharge of untreat wastewater may cause sever adverse effects on environment and human being. In this study the concentration of these elements in the wastewater at different places in Nekaʹs Power Plant were determined. The analysis of the fuel combustion and the deposits from chemical cleaning of the outer surfaces of boiler pipes and preheater.showed the existence of V, Fe, Na, Ni, K, Zn, Cu, Cr and Co. The amount of V. in deposits was 60.0-70.Oppm which is higher than the standard limit. The analysis of the deposits from chemical cleaning of the inner side of the boiler pipes, condensors, stator water filter and gas turbine units showed the existence of Al, Ca, Co, Cr, Cu, Fe, Ni. Zn, Si and Na. The amount of Cu in the samples was found 90.0ppm which was much more than the standard limit (3.0ppm). The analysis of the wastewater of the chemical cleaning, ionic exchangers, sandfilters, chlorination cells and the final wastewater showed the existence of Al, Ca, Mg, Cu, Fe, Mn, Mo, Ni, Zn, Si, Na and K. However, these amount were less than the standard limit. The concentration of the sulfate in the final wastewater was found 4016. ppm.