环境工程学报2024，Vol.18Issue(12)：3454-3466,13.DOI:10.12030/j.cjee.202401031
利用悬浮颗粒物调控天然水体溶解性有机质特征及其环境效应
Regulation of dissolved organic matter characteristics and related environmental effects in natural water bodies using suspended particulate matter
摘要
Abstract
The occurrence characteristics of dissolved organic matter(DOM)are a crucial factor affecting the quality of natural water bodies.Meanwhile,the transport and sedimentation processes of suspended particulate matter(SPM)in water significantly influence DOM properties.To investigate the impact of SPM on DOM occurrence characteristics and related environmental effects,an in-situ water ecosystem with gradients of particle concentration was constructed in a natural water pond.The DOM occurrence characteristics in natural water bodies and the variation of DOM components with SPM influence,as well as the changes in water quality and algal communities,were investigated.The results showed that after adding SPM with turbidity levels of 25,50,and 75 NTU,the DOM concentration significantly decreased by 2.82,2.22 and 2.16 mg·L-1,respectively.However,the concentration of colored DOM(CDOM)increased noticeably,and a355 increased by 1.19,1.45 and 1.55 m-1,respectively.Additionally,the contents of dissolved nitrogen and chlorophyll-a decreased significantly,altering the structure and biomass of algal communities,leading to the changes in DOM characteristics(aromaticity and molecular weight).The optimal time interval for the DOM characteristics,water quality,and algal communities was found to be 50～150 hours after the SPM addition.There is a clear contrast between the decline of DOM and the rise of CDOM.The SPM concentration had a negative correlation with the decrease in DOM(P＜0.05)and a positive correlation with the increase in CDOM(P＜0.05).The analysis of three-dimensional fluorescence and fluorescence index demonstrated that the DOM components involved in the regulation process are primarily protein-like and exhibited highly autogenous characteristics.This suggests that the adsorption and sedimentation of SPM,as well as the dynamic changes of algal communities under SPM influence,are significant factors contributing to the alterations in DOM characteristics.This study provides a scientific basis for understanding the key processes and mechanisms by which SPM regulates the DOM characteristics,facilitating the development of in-situ control techniques for DOM occurrence characteristics in natural water bodies.关键词
天然水体/溶解性有机质/悬浮颗粒物/藻群落结构/水质调控Key words
natural water body/dissolved organic matter/suspended particulate matter/algal community structure/water quality regulation分类
资源环境引用本文复制引用
董浪生,张洪刚,刘凡,逯聪,张昱..利用悬浮颗粒物调控天然水体溶解性有机质特征及其环境效应[J].环境工程学报,2024,18(12):3454-3466,13.基金项目
国家重点研发计划资助项目(2021YFC3200904) （2021YFC3200904）
