Investigation and Assessment of Water Pollution Sources in Southern Jiangsu Province--A Case Study of Xinqiao Town of Danyang

In order to find out the status of water pollution sources and put forward pollution control scheme for the sort of industrial small town in southern Jiangsu province,the water pollution sources loading of Xinqiao town were investigated and assessed by using questionnaire,mathematics models,analogy,and on-the-spot sampling.The result showed that the pollution sources in the town consisted of electroplating industry drainage,township domestic sewage,rural domestic sewage,farm runoff,and township overland flow.Among them,electroplating industrial pollution was characterized by heavy metals and other four pollution sources were nutrient salts and COD.Equivalent standard pollution load method was applied to assess importance of the latter four pollution sources and their pollutants.Since farm runoff in rice season was bigger than that in wheat season,the order of pollution sources in rice season differed from that in wheat season.According to priority,the order of pollution sources was farm runoff township domestic sewage rural domestic sewage township overland flow in rice season,and township domestic sewage rural domestic sewage farm runoff township overland flow in wheat season,respectively.The order of pollutants were COD TP TN NH3-N according to priority all the year round.These suggested that the pillar industry category in a small town decided industrial water pollution status;the township domestic sewage load was more than rural domestic sewage load,and the difference would become greater and greater in the course of urbanization;the township overland flow pollution load was small.An systemic and operable investigation and assessment method was established.