2009—2017年南充市城区酸雨特征分析

为了更为有效地治理酸雨污染,根据南充市环境监测中心站提供的2009—2017年降水监测数据,对南充市城区酸雨污染情况进行了分析及源解析。结果表明:2009—2017年,南充市降水pH从4.60波动上升至5.6以上,酸雨频率波动下降,酸雨污染情况有所改善;SO4^2-]/NO3^-]从4.92下降至0.86,酸雨污染类型从硫酸型转变为硝酸-硫酸型。同时,对比分析2014—2016年大气污染物排放源可知,NOx排放源中,工业污染源占比由14%降至11%,生活污染源由2%上升至5%;SO2排放源中,工业污染源占比由62%降至43%,生活污染源由38%上升至57%,表明南充市SO2污染已从以工业污染源为主转变为工业污染源与生活污染源并重。

Study on the Characteristics of Acid Rain in Nanchong City from 2009 to 2017

In order to effectively control acid rain pollution,this paper analyzed the acid rain pollution in Nanchong city based on the precipitation monitoring data in 2009-2017 provided by Nanchong City Monitoring Station.The results showed that during 2009-2017,the local precipitation pH fluctuated to above 5.6 from 4.60,the frequency fluctuation of acid rain was decreased,and the acid rain pollution situation was lightened.The ratio of SO4^2-/NO3^- decreased from 4.92 to 0.86.It can be seen that the type of acid rain pollution in Nanchong city changed from“sulphate type acid rain”to“nitrate type acid rain”.At the same time,a comparative analysis of air pollution emission sources froM2014 tO2016 showed that among the NO x pollution sources,the proportion of industrial pollution sources had dropped from 14%to 11%;the source of domestic pollution had increased froM2%to 5%;among the pollution sources of SO2,the proportion of industrial pollution sources was reduced by 62%from 43%;the source of domestic pollution increased from 38%to 57%,shifting from industrial pollution sources to industrial pollution sources and domestic pollution sources.