Evaluation And Prevention Of Heavy Metals In Liangshan Section Of Anning River

Rivers are an important source of water for production and people’s living water,and poor water quality directly affects the quality of human and domestic water production.At present,with the rapid development of industrialization and the rapid development of human society,so that pollutant emissions intensified,a large number of pollutants continue to flow into the natural river,the river has become a natural water intake of sewage,and faced with serious pollution problems.Among the various pollutants,heavy metals are important potentially hazardous pollutants,which will perpetuate the environment and create ecological risks through geochemical cycles.Because the environment of heavy metals is not easy to be removed,but long-term human environment,organisms on the toxic accumulation.At this stage the risk of heavy metal pollution has become a global environmental issue that attaches great importance.(1)Based on the principal component analysis(PCA),the results showed that the main pollutants were Zn,Pb,Fe and Mn.(2)Through the analysis of the changes of major heavy metal pollutants during the year,the four heavy metals of Zn,Pb,Fe and Mn in the South River are reduced year by year.This is mainly due to the establishment of tailings in the rare earth mining mines in the upper reaches of the Nanhe River,The illegal selection of enterprises,reducing the rare earth mining and smelting into the South River heavy metal sewage;Sun water He element is the 2014 average is significantly higher than 2013 and 2015,while the Fe element is showing a decreasing trend year by year,this May be due to Sun Shui River upstream iron ore washing plant after the closure of pollution sources due to cut off.The iron ore washing and smelting enterprises in the Liangshan section of Anning River contribute greatly to the Fe element in the Liangshan section of Anning River,and also accord with the distribution characteristics of the iron ore enterprises in the Liangshan section of Anning River.The enrichment characteristics are obvious.(3)From the point of view of the distribution of lead,the distribution of lead and zinc has the same obvious trend,and they all appear in the peak of the No.2 South River section,and the variation range is larger,and the concentration of the cross section decreases gradually.The iron distribution is gradually The distribution of Mn in the last section reaches the peak;the multi-year mean distribution of manganese is characterized by the concentration of heavy metals,Fe,Mn maintained at a high concentration level,the multi-year average of Fe in addition to the background section of the Guanyin rock did not exceed Surface Water Environmental Quality Standard Class Ⅲ water quality limits,and the remaining sections exceed the surface water environmental quality standard Class Ⅲ water quality limits,while Mn is in all sections exceeding the surface water environmental quality standard Class Ⅲ water quality limits.(4)Henan River to A qi bridge section of water quality heavy metal Pb environmental load is small,the need for timely control of pollution sources,reduce heavy metal Pb emissions.At the same time,we should actively explore the ecological restoration of the rare earth mining area of Mianning Mangning Ping,the reasonable disposal of the tailings and the mine,and the orderly mining of the mine to reduce the heavy metal into the river due to the mining,and the need for timely sedimentation of the river,Reduce the deterioration of water quality due to sediment disturbances and ensure environmental safety.