宁波农村地区典型村镇河流污染现状及控制策略

根据2008年10月-2009年9月宁波农村地区典型村镇河流的现场水质指标、各态氮磷和有机物浓度的周年监测结果，对村镇河流的水体污染现状进行全面分析。结果表明：（1）从现场水质指标看，村镇河流的水温和pH指标相对正常，溶解氧浓度受河流有机污染和水体富营养化影响，伴随日照强度呈现大小畀端的现象，河流水质浊度总体较高且与地表径流存在较高相关性；（2）村镇河流呈现NO3^--N低NH4^＋—N高的氮污染特征，可溶态氮磷占TN、TP比例较高。分另4为80．4％和59．1％；（3）村镇河流氮磷和有机物污豢均较严重，NH4^＋-N、TP、CODMa指标已有92．7％、65．6％和32．3％的时间断面属劣V类水质，枯水期是村镇河流污染最严重的时期。

Water Pollution Status and Control Strategies in Typical Rivers in Town and Village in Rural Area of Ningbo

Field water quality data, different nitrogen and phosphorus forms, and concentrations of organic matter were monthly monitored in typical rivers in town and village from September 2008 to October 2009 in rural area of Ningbo. Based on those data, water pollution status of rivers in town and village was analyzed in detail. The results showed that ： （ 1 ） Water temperature and pH in rivers were normal relatively. Goncentrations of DO were affected by organic pollution and eutrophication, and acutely varied by sunlight intensity. The overall turbidity of river water was high and closely correlated with runoff. （2）Concentrations of NO3^- - N were low and concentrations of NH4^＋ - N were high in rivers in town and village, and the ratios of soluble N and P to TN and TP were all high, accounting for 80. 4% and 59. 1% respectively. （3） Nutrient and organic pollution were all serious in rivers in town and village, and 92. 7% ,65. 6% ,32. 3% samples of NH4^＋ - N, TP, CODMa, were worse than Grade V, and the water quality was worst in lowflow period.