ADSORPTION ACTIVITY AND MECHANISM OF POLLUTANTS REMOVAL BY SUBSTRATES UNDER THE DYNAMIC STRENGTHENING OF VERTICAL FLOW

WU Hao; JIANG Cheng; CAO Wenping; LI Zebing

doi:DOI:10.13205/j.hjgc.202207008

Volume 40 Issue 7

Sep. 2022

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WU Hao, JIANG Cheng, CAO Wenping, LI Zebing. ADSORPTION ACTIVITY AND MECHANISM OF POLLUTANTS REMOVAL BY SUBSTRATES UNDER THE DYNAMIC STRENGTHENING OF VERTICAL FLOW[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 52-60,115. doi: DOI:10.13205/j.hjgc.202207008

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WU Hao, JIANG Cheng, CAO Wenping, LI Zebing. ADSORPTION ACTIVITY AND MECHANISM OF POLLUTANTS REMOVAL BY SUBSTRATES UNDER THE DYNAMIC STRENGTHENING OF VERTICAL FLOW[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 52-60,115. doi: DOI:10.13205/j.hjgc.202207008

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ADSORPTION ACTIVITY AND MECHANISM OF POLLUTANTS REMOVAL BY SUBSTRATES UNDER THE DYNAMIC STRENGTHENING OF VERTICAL FLOW

doi: DOI:10.13205/j.hjgc.202207008

WU Hao^1,2,
JIANG Cheng^{1
,
,},
CAO Wenping^3,4,
LI Zebing²

1. Institute of Energy Research, Jiangxi Academy of Sciences, Nanchang 330096, China;
2. School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China;
3. School of Environmental Engineering, Xuzhou Institute of Technology, Xuzhou 221111, China;
4. Jiangsu LYG Environmental Technology Co., Ltd, Xuzhou 221003, China

Received Date: 2021-09-30
Available Online: 2022-09-02

Abstract

Abstract

As the skeleton part of the constructed wetland,the substrates play an important role in removing pollutants.Under the vertical flow dynamic conditions with different influent loads,the experiments selected loess balls,anthracite coal,and shale ceramsite for pollutant removal.For in-depth research about the adsorption activity and mechanism of three substrates,the mineral composition,and surface morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The test results showed that due to its own deprotonation,loess balls could remove 80% of NH₄⁺-N in the initial stage.Under high phosphorus load,the electrostatic interaction and atomic coordination reaction of loess balls improved their adsorption capacity for soluble reactive phosphorus (SRP) and particulate phosphorus (PP).In addition,the physical adsorption of loess balls had an average removal rate of 50% on COD,and improved the composition of dissolved organic matter (DOM) dominated by aromatics in water.The TP removal rate of anthracite could reach 80%,while the adsorption capacity of phosphorus for per unit matrix was 6.89 mg/kg.Due to the electrostatic adsorption of anthracite,the removal of SRP accounted for 44% of the TP removal.Shale ceramsite was derived from its own rich metal mineral composition,which was better in PP removal.The three substrates all showed certain adsorption activity on different pollutants in the continuous test,and "adsorption fatigue" of the pollutants also had significant differences in the continuous test.It was found that loess balls had potential application value of wetland substrates and helped to optimize the DOM components in water.
- dynamic test,
- DOM,
- adsorption activity,
- adsorption fatigue,
- loess ball

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References(31)

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