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Bioremediation of Landfill Leachate ...

Pan, Shanglei.

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Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria./
Author:	Pan, Shanglei.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	111 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-01, Section: B.
Contained By:	Dissertations Abstracts International83-01B.
Subject:	Environmental engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28490548
ISBN:	9798516072239

Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria.
Pan, Shanglei.

Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 111 p.

Source: Dissertations Abstracts International, Volume: 83-01, Section: B.

Thesis (D.E.)--Lamar University - Beaumont, 2021.

This item must not be sold to any third party vendors.

This dissertation research focused on evaluating, verifying, and developing an algal-based system for landfill leachate treatment using a thermo-tolerant acidophilic alga, Galdieria sulphuraria. Nutrient removal (mainly NH4-N and PO4-P) from landfill leachate and algal biomass production were determined and used to evaluate and optimize the system's performance. In the first phase of the study, the potential of using a thermophilic mixotrophic alga, Galdieria sulphuraria, to perform on-site treatment of leachate was evaluated using different concentrations of landfill leachate (LL) and different N/P mass ratios. Results confirmed that G. sulphuraria could be cultivated in 20% LL and gain higher final biomass density and higher NH4-N removal efficiency than the algae grown in the artificial standard growth medium. The addition of phosphorus (P) can increase the removal rate and efficiency of nitrogen (N) removal. A range of initial N/P mass ratio (100:1 to 25: 1) has been used further to evaluate this algal system's nutrient removal efficiency under multiple conditions. The results validated the potential of using Galdieria sulphuraria for the bioremediation LL.A 23 full factorial design experiment showed that the optimal condition for G. sulphuraria biomass production and nutrient removal was 20% LL dilution with a starting biomass concentration of 0.25 g L-1 with an initial ammoniacal nitrogen addition to the level as twice in the standard media. This factorial study further reiterated the high tolerance to ammoniacal nitrogen of this algal strain.Experiments conducted with three different bioreactor scales proved that the medium-scale photobioreactor had the best performance in biomass production, nitrogen, and phosphorus removal. Higher light intensity, mixing through bubble aeration, tubular bioreactor design, and larger surface area to volume ratio may have contributed to this enhanced performance in medium-scale bioreactors rather than small and large-scale reactors. A long-term running experiment (25 days) verified that tubular bubbling bioreactor could achieve relatively stable and effective performance for algae-based landfill leachate treatment and competitive algae biomass production (0.46 g L-1 day-1 average biomass growth rate) in long-term operation. This is an encouraging result for the practical application of this technology in the future.

ISBN: 9798516072239Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Galdieria sulphuraria

Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria.
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245 1 0 $a Bioremediation of Landfill Leachate Using an Algal-Based System: An Application of Red Alga Galdieria sulphuraria.
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300 $a 111 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-01, Section: B.
500 $a Advisor: Selvaratnam, Thinesh.
502 $a Thesis (D.E.)--Lamar University - Beaumont, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation research focused on evaluating, verifying, and developing an algal-based system for landfill leachate treatment using a thermo-tolerant acidophilic alga, Galdieria sulphuraria. Nutrient removal (mainly NH4-N and PO4-P) from landfill leachate and algal biomass production were determined and used to evaluate and optimize the system's performance. In the first phase of the study, the potential of using a thermophilic mixotrophic alga, Galdieria sulphuraria, to perform on-site treatment of leachate was evaluated using different concentrations of landfill leachate (LL) and different N/P mass ratios. Results confirmed that G. sulphuraria could be cultivated in 20% LL and gain higher final biomass density and higher NH4-N removal efficiency than the algae grown in the artificial standard growth medium. The addition of phosphorus (P) can increase the removal rate and efficiency of nitrogen (N) removal. A range of initial N/P mass ratio (100:1 to 25: 1) has been used further to evaluate this algal system's nutrient removal efficiency under multiple conditions. The results validated the potential of using Galdieria sulphuraria for the bioremediation LL.A 23 full factorial design experiment showed that the optimal condition for G. sulphuraria biomass production and nutrient removal was 20% LL dilution with a starting biomass concentration of 0.25 g L-1 with an initial ammoniacal nitrogen addition to the level as twice in the standard media. This factorial study further reiterated the high tolerance to ammoniacal nitrogen of this algal strain.Experiments conducted with three different bioreactor scales proved that the medium-scale photobioreactor had the best performance in biomass production, nitrogen, and phosphorus removal. Higher light intensity, mixing through bubble aeration, tubular bioreactor design, and larger surface area to volume ratio may have contributed to this enhanced performance in medium-scale bioreactors rather than small and large-scale reactors. A long-term running experiment (25 days) verified that tubular bubbling bioreactor could achieve relatively stable and effective performance for algae-based landfill leachate treatment and competitive algae biomass production (0.46 g L-1 day-1 average biomass growth rate) in long-term operation. This is an encouraging result for the practical application of this technology in the future.
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653 $a Microalgae
653 $a Wastewater treatment
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