Lead Pollution Factor Analysis And Prevention Measures Of Weihe Riverside Phreatic Water

With facing severe water supply situation, Wei Nan city needs to find new water supply sources that have much more water.There is no such place. Weihe riverside Phreatic water is a good choice,because it is rich in water and easily to use. We must find the sources of pollution and make proper protections if we decide to exploit it,because Weihe riverside phreatic water has been serious polluted. So,analyze the main component and sources of pollution, find out the lead pollution factor,and protect phreatic water have significant meaning.This paper was focused on analyzing and finding out the lead pollution factor of Weihe riverside phreatic water.First,collected water quality data before,such as 2005;then,arrange Weihe riverside phreatic water's long term monitoring work.It had designed 3 transverse sections and 27 monitoring points(5 river points and 22 phreatic water points), monitored six times from From 2009-8-15 to 2010-1-22,got 95 water samples (21 Weihe river samples and 74 phreatic water samples),monitored more than 20 kinds of components,such as water temperature,pH,NH4+,Mn2+,Pb2+, total hardness,permanganate index,and so on.Then got the current water quality data from 2009 to 2010.Second, by using the fuzzy mathematics method to evaluate water quality,it had got phreatic water quality was mainly relatively poor in 2005 and 2009-2010.Third, afte analysised the data,it had defined that nitrogen was the main pollution component of phreatic water.Fourth,then, studied nitrogen's distribution characteristics on the plane, variations with time and changes in the three sections, and found out city,agriculture and the Weihe river were the sources of nitrogen pollution.Fifth, it had defined Weihe river was the lead factor of phreatic water pollution after compared the influence of it's three pollution sources,because it had the most important effect on nitrogen, the main component of pollution.Finally, it specifically put forward countermeasures of protection of Weihe riverside phreatic water.This paper mainly came to the conclusions that:1 Nitrogen and manganese were the widespread pollutants in Weihe riverside phreatic water quality. Chlorine ion contents of most of groundwater in the north bank of the Weihe rive were high. Local pollutants included chlorine ion,total hardness, permanganate index,and so on.2 Fuzzy mathematics method used in comprehensive evaluation of the water quality was feasible,and the comprehensive evaluation showed:in the year of 2005,the overall phreatic water quality were the poor four grade,some reached the very poor in five. In the latter part of 2009, the deterioration of phreatic water quality were even more serious,because many phreatic water qualities were rated the very poor in five, only a few reached the lower four grade and the general three.3 Nitrogen was the main pollution component of Weihe riverside phreatic water.(1) From 2005 to the end of 2009, the pollution scope of the ammonia nitrogen and nitrite nitrogen were substantially expanded, but the scope of nitrate nitrogen was reduced.(2) Based on time,ammonia nitrogen can be classified as rainfall-led type, pollution-led type and transition of pollution type. And acid nitrogen can be classified as rainfall-led type, reaction-led type and flow-led type.(3)Along with 3 transverse sections, the trends of nitrogen were:the nearer from Weihe river,the more serious of it;the farther from Weihe river,the slighter of it.This provided strong evidence to find the lead pollution factors of Weihe riverside phreatic water.4 The pollution sources of Weihe riverside phreatic water included city, agriculture and Weihe river,and Weihe river was the lead pollution factor among them.