长荡湖前置库悬浮颗粒物特征及与水质间的关系

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摘要为探究前置库内悬浮颗粒物(SPM)特征及对水质的潜在影响,对2022年12月(枯水期)、2023年4月(平水期)及8月(丰水期)长荡湖大浦港前置库上、中、下游区域水体SPM粒径特征和空间分布,以及水质的净化效果进行了分析,并结合原位试验分析了丰水期SPM的拦截机理.结果表明,前置库对NH₄⁺-N、TN和TP的去除率最高分别达46.42%、51.59%和36.83%,入库区域对污染物削减贡献大.表层水体内SPM粒径对SPM中TOC(P=0.018)和TN浓度(P=0.011)有显著影响,粒径增加携带的碳、氮浓度也相对增加.原位试验结果显示表层和底层水体捕获的沉降颗粒物内TN和TP浓度分别是自由水体的2.33~5.25和4.53~5.72倍,且水体氮、磷浓度与SPM内氮、磷的浓度分布呈负相关,表明SPM作为污染物的运输和吸附载体,通过吸附、沉降等作用影响水体污染物的转化.前置库能够通过去除SPM而改善入湖水质,为高浊度水体的治理提供了依据.

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	张松贺
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关键词 ：前置库, 悬浮颗粒物, 水质净化

Abstract：In order to study the characteristics of suspended particulate matter (SPM) in the pre-dam and its potential impact on water quality, we investigated the spatial distribution of SPM and nutrients contents in overlying water in the upstream, midstream and downstream areas of the Dapu Harbor pre-dam system in Lake Changdang in low (December, 2022), medium (April, 2023) and high flow season (August, 2023). We also conducted an in-situ experiment to explore the interception mechanism in pre-dam system in high flow season. The results showed that about 46.42% of NH₄⁺-N, 51.59% of TN and 36.83% TP were removed from overlying water through the pre-dam system, which play an import role on pollutes reduction. It should be noted that SPM sizes had significant effects on TOC (P=0.018) and TN concentration (P=0.011) and carbon and nitrogen contents in SPM increased with the increase of SMP sizes in surface layer of water column. The in-situ experiment revealed that TN and TP content were 2.33~5.25times and 4.53~5.72times higher in captured SPM from the surface and bottom layers of water column than in the free water body, respectively, and N and P concentrations in the water column were negatively correlated with the TN and TP concentrations in SPM, respectively. These data demonstrate that SPM as carrier can adsorb and transport pollutes, and SPM has a great influence on pollutes transformation through adsorption and precipitation. This study provided sound data that pre-dam system can improve water quality through SPM removal, especially for the treatment of high turbid water in inlet rivers of lake.

Key words： pre-dam suspended particulate matter water purification

收稿日期: 2024-05-20

PACS:

X524

基金资助:2023年度江苏省建设系统科技项目(2023ZD111,2023ZD113)

通讯作者: 张松贺,教授,shzhang@hhu.edu.cn E-mail: shzhang@hhu.edu.cn

作者简介: 张松贺(1977-),男,河南西平人,教授,博士,主要从事水污染控制与生态修复等方面的研究.发表论文100余篇.shzhang@hhu.edu.cn.

引用本文:

张松贺, 段如菲, 罗敏, 陈辉, 杨剑. 长荡湖前置库悬浮颗粒物特征及与水质间的关系[J]. 中国环境科学, 2024, 44(12): 6858-6864. ZHANG Song-he, DUAN Ru-fei, LUO Min, CHEN Hui, YANG Jian. Characteristics of suspended particulate matter and its impacts on water quality in pre-dam system of Lake Changdang. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6858-6864.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I12/6858

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