Ji Xiyan, Zhang Weizhen, Jiang Mengqi, He Jian, Zheng Zheng
Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China E-mail:
Water Sci Technol. 2017 Oct;76(7-8):2051-2064. doi: 10.2166/wst.2017.372.
The black-odor mechanism of Yitong River was analyzed based on survey and monitoring results. We found that organic matter is the main pollution source of Yitong River and its tributaries. A black-odor evaluation model that can describe the pollution of the Yitong River water system was developed, and this model has the parameters I = 0.21 [COD] + 0.18 [DO] - 0.36[NH-N] + 0.91. The model performance was satisfactory with a black-odor defining accuracy of 69%. Moreover, we found that COD, NH-N, and DO are the influential factors of the Yitong River black-odor water body and that their threshold values when the water body transitioned to black odor were 109.2, 1.90, and 7.50 mg·L, respectively. We found that most of the Yitong River was polluted by six heavy metals, namely, As, Cd, Cr, Cu, Pb, and Zn. We used the Nemerow method to calculate the heavy metal pollution degree of each sampling point and found that 60% of the points were seriously polluted. Furthermore, we drew the heavy metal pollution distribution map of the Yitong River. Finally, we proposed an effective measure called new-type multistep constructed wetland to improve the water quality of Yitong River.
基于调查和监测结果，分析了伊通河黑臭机理。我们发现有机物是伊通河及其支流的主要污染源。建立了一个能描述伊通河水系污染情况的黑臭评价模型，该模型的参数为I = 0.21[化学需氧量] + 0.18[溶解氧] - 0.36[氨氮] + 0.91。该模型性能良好，黑臭界定准确率为69%。此外，我们发现化学需氧量、氨氮和溶解氧是伊通河黑臭水体的影响因素，水体转变为黑臭时它们的阈值分别为109.2、1.90和7.50mg·L。我们发现伊通河大部分区域受到砷、镉、铬、铜、铅和锌这六种重金属的污染。我们采用内梅罗法计算了各采样点的重金属污染程度，发现60%的点位受到严重污染。此外，我们绘制了伊通河重金属污染分布图。最后，我们提出了一种名为新型多级人工湿地的有效措施来改善伊通河水质。
