摘要
沉积物内源磷释放会对水体造成二次污染,沉积物团聚体的稳定性与水体污染关系密切。以秦淮河石头城的沉积物为研究对象,探究沉积物总磷释放与团聚体稳定性的关系以及影响总磷释放和团聚度的因素。结果表明,不同pH的上覆水中,沉积物总磷释放浓度最大可达0.91 mg/L,一定时间内团聚度下降最大幅度为27.27%;沉积物有机质含量越高(1.0%),总磷释放浓度和团聚度最大下降幅度越小(分别为1.48 mg/L和62.84%);扰动强度越大(200 r/min),总磷释放浓度和团聚度下降最大幅度越大(分别为2.32 mg/L和65.23%)。颗粒内扩散模型和Boxlucasl模型的拟合结果表明在沉积物释放总磷过程中,总磷释放量越大,团聚度越小;颗粒物理吸附-解吸作用比沉积物颗粒的扩散作用强;有机质在沉积物释放总磷过程中起着重要作用,且对沉积物团聚度有着重大影响。
The release of endogenous phosphorus from sediments will cause secondary pollution to water bodies. The stability of sediment aggregates is closely related to water pollution. Taking sediments from Shitoucheng of Qinhuai River as the research object, the relationship between the release of total phosphorus and the stability of sediment aggregates as well as the factors affecting the release of total phosphorus and aggregation degree were investigated. The results show that the maximum release concentration of total phosphorus in overlying water of different pH values is 0.91 mg/L, and the maximum decrease of aggregation degree is 27.27% in a certain period of time. The higher the organic matter content(1.0%), the smaller the maximum decrease of total phosphorus release concentration and aggregation degree(1.48 mg/L and 62.84%, respectively). With the increase of disturbance intensity(200 r/min), the maximum decrease of total phosphorus release concentration and aggregation degree is 2.32 mg/L and 65.23%, respectively. The fitting results of the intra-particle diffusion model and Boxlucasl model show that in the process of releasing total phosphorus from sediments, the greater theamount of total phosphorus releases, the smaller the degree of aggregates. The physical sorption and desorption of sediment particles are stronger than the diffusion of sediment particles in the process of total phosphorus release. Organic matter plays an important role in the release of total phosphorus from sediments and has a significant impact on the degree of sediment aggregation.
作者
胥梦琦
杨雪
徐剑波
刘叶
沈文韬
马剑波
陈靓
汪存石
祝建中
XU Meng-qi;YANG Xue;XU Jian-bo;LIU Ye;SHEN Wen-tao;MA Jian-bo;CHEN Liang;WANG Cun-shi;ZHU Jian-zhong(College of Environment,Hohai University,Nanjing 210089,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Nanjing 210089,China;Drainage Facilities Operation Center of Nanjing Tap Water General Company,Nanjing 210089,China;China First Metallurgical Group Co.,Ltd.,Wuhan 430081,China;State Grid Jiangsu Electric Power Engineering Consulting Co.,Ltd.,Nanjing 210036,China;Management Division of Qinhuai River Hydraulic Engineering of Jiangsu Province,Nanjing 210022,China)
出处
《科学技术与工程》
北大核心
2022年第33期14959-14966,共8页
Science Technology and Engineering
基金
国家自然科学基金重点项目(51438006)
国家自然科学基金面上项目(51979077)
中央高校基本科研业务费(2019B42414)
江苏省科技计划(BE2019121)
中国一冶集团有限公司科研基金(22AQT210861500)
国网江苏省电力工程咨询有限公司科研基金(SGJSHY00XMJS2100174)。
关键词
秦淮河
沉积物团聚体
总磷释放
团聚度变化
Qinhuai River
sediment aggregates
total phosphorus release
changes in aggregation degree
