Seasonal variations in dissolved organic matter concentration and composition in an outdoor system for bank filtration simulation  

作　　者：Muhammad Zeeshan Omamah Ali Shamas Tabraiz Aki Sebastian Ruhl 

机构地区：[1]German Environment Agency,Section II 3.3,Schichauweg 58,12307,Berlin,Germany [2]Technische Universitat Berlin,Water Treatment,KF4,Str.des 17.Juni 135,10623,Berlin,Germany [3]Natural and Applied Sciences Section,School of Psychology and Life Sciences,Canterbury Christ Church University,Canterbury,CT11QU,UK

出　　处：《Journal of Environmental Sciences》2024年第1期252-261,共10页环境科学学报（英文版）

基　　金：supported by the German Academic Exchange Service (DAAD)and Higher Education Commission (HEC),Pakistan。

摘　　要：Dissolved organic matter(DOM)in surface waters can vary markedly in character depending on seasonal variations such as rainfall intensity,UV radiations and temperature.Changes in DOM as well as temperature and rainfall intensity over the year can affect the biochemical processes occurring in bank filtration(BF).Identification and characterization of DOM in the surface water could help to optimize the water treatment and provide stable and safe drinking water.This study investigated year-long variations of DOM concentrations and compositions in a surface water of a circulated outdoor pond(research facility)connected to a BF passage.DOM was dominated by humic substances and a changing pattern of DOM in surface water was observed throughout the year.A significant increase of DOM(~38%)in surface water was noted in August compared to November.The fluorescent DOM showed that DOM in summer was enriched with the degradable fraction whilst non-degradable fraction was dominated in winter.A constant(1.7±0.1 mg/L)effluent DOM was recirculated in the system throughout the year.DOM removal through BF varied between 4%to 39%and was achieved within a few meters after infiltration and significantly correlated with influent DOM concentration(R^(2)=0.82,p<0.05).However,no significant(p>0.05)change in the removal of DOM was observed in two subsurface layers(upper and lower).This study highlights the presence of a constant non-degradable DOM in the bank filtrate,which was not affected by temperature,redox conditions and UV radiations.

关 键 词：Bank filtration Dissolved organic matter Dissolved oxygen Fluorescence spectroscopy Excitation-emission matrix 

分 类 号：X52[环境科学与工程—环境工程]