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The Role of Dissolved Organic Matter on Phosphorous Sorption onto Iron-Enhanced Activated Alumina Media using In-Field and Flow-Through Column Experiments

Fatema, Umme
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1661155726906996

Abstract Details

2022, Master of Science (MS), Bowling Green State University, Geology.
The Western Lake Erie Basin (WLEB) has been experiencing harmful algal blooms due to increases in dissolved reactive phosphorous (DRP) from agricultural land in the Maumee River watershed. Agricultural best management practices (BMPs) can be useful to mitigate the DRP loads; nevertheless, DRP is not always fully removed by in-field BMPs. Phosphorous (P) removal structures can be filled with phosphorus sorption materials (PSM) such as iron and aluminum oxides and can be placed at the junction of runoff and subsurface drainage to trap DRP from tile drainage. However, dissolved organic matter (DOM) from the agricultural farmland might compete with phosphate ions (PO43-) at the adsorption sites in the media, reducing its lifetime and efficiency. Therefore, laboratory flow-through column experiments were conducted to determine whether DOM is affecting P sorption onto iron enhanced activated alumina media (Alcan). The experiments were informed by field data collected from a regional farm. Alcan (Al/ Fe (hydro) oxides) media was efficient in removing PO43- coming into the filtering system and thereby, flow-through column experiments were able to determine a discrete P removal percentage efficiency of 83.32%, 68.26%, 66.54%, 57.16% and 41.27% by the end of treatment I (5mg L-1 PO43- only), treatment II (5mg L-1 PO43- and 5 mg L-1 DOM), treatment III (5mg L-1 PO43- and 10 mg L-1 DOM), treatment IV (5mg L-1 PO43- and 20 mg L-1 DOM), and treatment V (10mg L-1 PO43- and 20 mg L-1 DOM), respectively. Moreover, from exponential regression analysis of P removal curves for each treatment, it was measured that a total cumulative of 231.45 gm, 92.65 gm, 92.06 gm, 65.998 gm and 91.476 gm of P per kg PSM can be added to treatment I, II, III, IV and V, respectively, until the media gets fully saturated, i.e., concentration of influent PO43- would be equal to the effluent PO43- concentrations. It is evident that DOM is competing with PO43- decreasing PO43- sorption onto the Alcan media. Plausible geochemical mechanisms involved in the competitive sorption between DOM and PO43- onto the media include surface protonation and ligand exchange. The change in pH, concentration of influent PO43- and DOM throughout the length of the experiments was crucial on suggesting the adsorption mechanisms of both DOM and PO43-.
Angélica Vázquez-Ortega, PhD (Committee Chair)
Enrique Gomezdelcampo, PhD (Committee Member)
Margaret (Peg) M. Yacobucci, PhD (Committee Member)
81 p.
Environmental Geology; Environmental Science; Environmental Studies; Geochemistry; Geology; Soil Sciences
Flow-Through Column Experiments; P Removal Structure; PSM; Phosphorous; Sorption; Materials; Iron Oxides; Aluminum Oxides; Iron-Enhanced Activated Alumina Media; Dissolved Organic Matter; Phosphate; Adsorption; P Removal Curve; Surface Protonation; Ligand Exchange Mechanism; Eutrophication;

Recommended Citations

Citations

  • Fatema, U. (2022). The Role of Dissolved Organic Matter on Phosphorous Sorption onto Iron-Enhanced Activated Alumina Media using In-Field and Flow-Through Column Experiments [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1661155726906996

    APA Style (7th edition)

  • Fatema, Umme. The Role of Dissolved Organic Matter on Phosphorous Sorption onto Iron-Enhanced Activated Alumina Media using In-Field and Flow-Through Column Experiments. 2022. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1661155726906996.

    MLA Style (8th edition)

  • Fatema, Umme. "The Role of Dissolved Organic Matter on Phosphorous Sorption onto Iron-Enhanced Activated Alumina Media using In-Field and Flow-Through Column Experiments." Master's thesis, Bowling Green State University, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1661155726906996

    Chicago Manual of Style (17th edition)

bgsu1661155726906996
92
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This open access ETD is published by Bowling Green State University and OhioLINK.