陕西瀛湖水中高pH值原因分析及防控对策研究

Cause Analysis of High pH Value and Control Strategies in Yinhu Lake of Shaanxi Province

为了研究陕西瀛湖水中高pH值的原因,基于2019年瀛湖水质监测数据,推断pH升高的诱因,并提出防控措施。研究表明:监测时段内,瀛湖水中pH值的变化与温度、DO、浊度、叶绿素a浓度和藻类密度的大小相关;在pH值超标阶段,白天pH值升高,夜间pH值下降,说明藻类大量生长是瀛湖pH升高的根本原因;防治水库pH异常,应控制水库中营养物质的含量。为减少水库中营养物质,需从减小外源输入和内源释放两方面进行防控,外源防控阻断污染物质的输入,内源防控宜采取生物法(如生物浮岛等)有效去除水库内部的营养物质,以期遏制水体富营养化的发展,短期内,可采用虹吸原理对瀛湖进行深层水排泄,以达到较好的瀛湖pH升高的应急处理效果。

In order to study the causes of high pH in Yinhu Lake of Shaanxi Province, the cause of pH increase was analyzed based on the water quality monitoring data of Yinghu Lake in 2019 in order to put forward corresponding control measures. The results showed that the variation trend of temperature, DO, turbidity, chlorophyll-A concentration and algal density was the same as that of pH during the monitoring period, indicating that the variation of pH in Yinghu Lake was related to the above indexes. Secondly, the pH value increased during the day and decreased at night when the pH bigger than 9.0. The main reason for the change of pH was the activity of algae in the water, which further indicated that the algal growth was the fundamental reason for the high pH in Yinghu Lake. The nutrient content in Yinghu Lake should be controlled to prevent pH anomalies in the reservoir. In order to reduce nutrients in the Yinghu Lake, prevention and control strategies should be carried out from both exogenous and endogenous pollution. For exogenous prevention and control, the input of pollutants should be blocked. For endogenous prevention and control, the biological methods(such as biological floating island, etc.) should adopted to effectively remove N, P and other nutrients in the reservoir, so as to curb the development of eutrophication. In the short term, the siphon principle can be used to drain the deep water of Yinghu Lake so as to achieve better emergency treatment effect of high pH of Yinghu Lake.