高庄水库清淤对水质提升的影响

Influence of Gaozhuang reservoir dredging on water quality improvement

为提升高庄水库水质,同时提高水库防洪和调蓄能力,对高庄水库实施了水库生态清淤工程,并分析水库底泥及水库清淤前后水质监测数据。结果表明:高庄水库清淤前水质有下降趋势,断面等级的主要控制因素主要是总磷含量、高锰酸盐指数和氨氮含量;底泥中的总氮含量主要来源于干物质,土壤综合污染程度不高,表现为尚清洁;底泥重金属具有同源性,表明其污染来源相同;清淤后水库水质断面等级提高明显,可降低水体中高锰酸盐指数和总磷含量,但作用不如降低氨氮含量明显;不同水期水质污染因子含量存在差异,主要表现为高锰酸盐指数汛期略高于非汛期,氨氮含量汛期低于非汛期,总磷含量汛期高于非汛期;为提高水库清淤效益,建议本次清淤10年后开展新一轮的清淤疏浚。

In order to improve the water quality of Gaozhuang reservoir and improve its flood control and storage capacity,the reservoir ecological dredging project was implemented for Gaozhuang reservoir.This paper analysed the water quality monitoring data of the reservoir sediment by dredging.The results show that the water quality of Gaozhuang reservoir has a downward trend before dredging,and the grade of the section is mainly controlled by the factors of total phosphorus content,permanganate index and ammonia nitrogen content;the total nitrogen content in the sediment is mainly derived from dry matter,and the soil is not highly polluted,which is relatively clean;the heavy metals in the sediment have homology,indicating that their pollutional sources are the same;after dredging,the water quality grade of the reservoir is obviously improved,which can reduce the permanganate index and total phosphorus content in the water body,but the effect is not as obvious as reducing the ammonia nitrogen content;there are differences in the content of water pollution factors in different water seasons;the permanganate index in flood season is slightly higher than that in non-flood season,the ammonia nitrogen content in flood season is lower than that in non-flood season,and the total phosphorus content in flood season is higher than that in non-flood season.In order to improve the benefit of reservoir dredging,it is advisable to conduct another dredging after 10 years.