典型感潮内河涌水质污染特征调查研究

Investigation on polluted water quality of the typical tidal urban river

以佛山市容桂街道典型的感潮闸控内河涌为研究对象,进行了连续3个月的水文和水质监测,测试指标包括CODCr、BOD5、总氮、氨氮、总磷及溶解氧等.调查结果显示,内河涌水质总体状况及污染物的浓度随河涌水位发生规律性的变化,在涨落潮和人工闸控水位等不同水位条件下,监测指标的最高浓度是最低浓度的8.3～49.4倍;河涌水体总体呈劣V类水质,各污染指标浓度超V类水体的0.5～7.2倍;感潮河涌涨落潮期间的污染物浓度和水位变化呈现显著负相关,落潮和涨潮期间污染物浓度比率为1.2～2.2;水体污染成分复杂,复合指标显示河涌水体有机污染物可生化性不高.河涌水质污染状况调查及对污染物浓度变化规律的探究为河涌的污染治理和生态修复技术的选择应用提供了重要的参考.

The hydrology and water quality of a tidal-gated urban river in the Pearl River Delta（PRD） region were consecutively monitored for three months.The results indicated that the investigated water body was overall inferior to water quality standard V grade of surface water,and the concentrations of each pollution indicator exceeded the standard V grade by 0.5 to 7.2 times.Water quality and the pollutant concentrations changed accordingly as the change of the water level,and the ratios of maximum-to-minimum concentrations of each pollutant fluctuated between 8.3 and 49.4.Trend of pollutant concentrations showed significant negative correlation to those of the water level,and the pollutant concentration ratio of low-to-high water level was 1.2 to 2.2.The complex composition of pollutants suggested they are of low biodegradability.This investigation revealed a common feature of the urban river in the PRD region and provided important information for the pollution control and ecological restoration technology.