曲江南湖水体污染特征及内源磷的释放研究
发布时间：2018-11-29 11:30
【摘要】：随着社会经济的不断发展,人们对生活品质和生态环境的要求也逐步升高,水景已是城市生态景观必不可少的组成部分。优美的水环境不但可以美化城市相貌,还能够有效地改善水体周边微气候。但是,近年来景观水体水质恶化以及出现富营养化现象,引起了不少新的环境问题。本文以曲江南湖景观水系为研究对象,通过测定具有代表性采样点连续四季的水质变化情况、沉积物基本性质以及采用模拟实验研究沉积物中磷的释放特性,综合分析水体污染现状。曲江南湖水化学特征以及不同形态的氮、磷在水体中的时空分布显示,南湖属偏碱性景观水体,其水质具有高浊度、低矿化度的特点;水中主要阴、阳离子的含量浓度为:Ca2+Mg2+Na+K+,HCO3-SO42-Cl-,水化学类型为重碳酸盐钙Ⅰ型;水体中各形态的氮、磷随季节变化规律是:总氮春夏季高而秋冬季低;硝酸盐氮秋冬季含量高;氨氮、亚硝酸盐氮含量夏季达到最大;磷含量春夏季较高;各形态的氮、磷下湖区偏高,东西分布相对均匀;同时对水质进行模糊综合评价结果为Ⅳ类,氮为主要污染物。沉积物pH值在7.50~8.07之间,含水率高、有机污染小,总氮含量494.86~823.12mg/kg,有机氮属Ⅱ类较清洁等级;总磷含量280.56~543.55mg/kg,采用SMT分级方法对沉积物中各形态磷进行了分析与研究,结果发现Ca-P是主要赋存形态。通过静态模拟实验探究了在不同环境条件(温度、pH、溶解氧和扰动)下磷形态的变化,结果表明:Al-P、Ca-P较稳定,但在酸性条件下会加速溶解;NH4-P在外力扰动下释放量最大;Fe-P、Org-P受溶解氧、pH和温度影响较大,各形态磷的吸附与释放能力有明显差异,对水体富营养化的影响不可忽视。本研究对曲江南湖水体环境污染及内源磷释放特征进行了分析,为制定水体污染控制策略和改善水质措施提供了新的依据,具有重要的科学意义。
[Abstract]:With the continuous development of social economy, people's requirements for the quality of life and ecological environment are also gradually rising, waterscape has become an essential part of urban ecological landscape. The beautiful water environment can not only beautify the appearance of the city, but also effectively improve the microclimate around the water body. However, the deterioration of landscape water quality and eutrophication in recent years have caused many new environmental problems. Taking the landscape water system of Qujiang South Lake as the research object, this paper studies the characteristics of phosphorus release from sediments by measuring the changes of water quality, the basic properties of sediments and the characteristics of phosphorus release from sediments in successive seasons at representative sampling points. The present situation of water pollution is analyzed synthetically. The chemical characteristics of Qujiangnan Lake water and the spatial and temporal distribution of nitrogen and phosphorus in different forms showed that Nanhu Lake belongs to alkaline landscape water and its water quality is characterized by high turbidity and low salinity. The main anion and cationic concentration in water were as follows: Ca2 Mg2 Na K, HCO3-SO42-Cl-, hydrochemical type was bicarbonate calcium type 鈪，
本文编号：2364876
[Abstract]:With the continuous development of social economy, people's requirements for the quality of life and ecological environment are also gradually rising, waterscape has become an essential part of urban ecological landscape. The beautiful water environment can not only beautify the appearance of the city, but also effectively improve the microclimate around the water body. However, the deterioration of landscape water quality and eutrophication in recent years have caused many new environmental problems. Taking the landscape water system of Qujiang South Lake as the research object, this paper studies the characteristics of phosphorus release from sediments by measuring the changes of water quality, the basic properties of sediments and the characteristics of phosphorus release from sediments in successive seasons at representative sampling points. The present situation of water pollution is analyzed synthetically. The chemical characteristics of Qujiangnan Lake water and the spatial and temporal distribution of nitrogen and phosphorus in different forms showed that Nanhu Lake belongs to alkaline landscape water and its water quality is characterized by high turbidity and low salinity. The main anion and cationic concentration in water were as follows: Ca2 Mg2 Na K, HCO3-SO42-Cl-, hydrochemical type was bicarbonate calcium type 鈪，
本文编号：2364876
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