水利水电技术（中英文）

以深圳河干流及其主要支流布吉河与新洲河为研究对象,采用现场调查的方法对其自净状态进行了评估。研究发现,深圳河主要污染物为有机物和氨氮,CODMn浓度平均范围为12~30 mg/L,氨氮平均浓度为6 mg/L左右。在河流好氧河段,有机物逐渐得到降解,氨氮通过硝化过程转化为硝氮,硝态氮是氮元素的主要形态(占60%)。在缺氧甚至厌氧河段,包括深圳河中下游、布吉河、新洲河下游等,有机物发生厌氧转化过程,出现黑臭现象,而氨氮产生积累,部分硝态氮通过反硝化作用得到去除,氨氮成为氮元素主要形态(占70%)。这表明,深圳河及其支流自净状态非常不稳定。本研究结果对于进一步改善深圳水环境质量和恢复生态提供重要的科学依据。

Taking the main stream of Shenzhen River and its major tributaries——Bujihe River and Xinzhouhe River as the study objectives,the self-purification of the river is evaluated with the method of the in-situ investigation. The study find out that the main pollutants in the river are organic matters and ammonia-nitrogen with the mean concentration of CODMnin a range of 12 ~ 30mg·L- 1and the mean concentration of ammonia-nitrogen in a range of about 6 mg·L- 1. In the aerobic reach of the river,organic matters are gradually degraded,while ammonia-nitrogen is transformed into nitrate-nitrogen through a nitrification process,and then it becomes the main form of nitrogen( 60%). In the anoxic and even anaerobic reach of the river,including the midlower Shenzhen River,Bujihe River and the lower Xinzhouhe River,an anaerobic transformation process of organic matter occurs with the black-odor phenomena,meanwhile,ammonia-nitrogen is accumulated,a part of nitrate-nitrogen is removed through denitrification and then ammonia-nitrogen becomes the main form of nitrogen( 70%). It is indicated that the self-purification status of Shenzhen River and its tributaries is quite instable. This study result can provide an important scientific basis for further improving the water environmental quality of Shenzhen River and restoring the ecology therein.