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The Growth of Microalgae on Anaerobi...

Paddock, Matthew Brian.

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The Growth of Microalgae on Anaerobic Digestate for Wastewater Treatment and Biofuel Production.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Growth of Microalgae on Anaerobic Digestate for Wastewater Treatment and Biofuel Production./
Author:	Paddock, Matthew Brian.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	267 p.
Notes:	Source: Masters Abstracts International, Volume: 81-03.
Contained By:	Masters Abstracts International81-03.
Subject:	Environmental engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13858913
ISBN:	9781085795500

The Growth of Microalgae on Anaerobic Digestate for Wastewater Treatment and Biofuel Production.
Paddock, Matthew Brian.

The Growth of Microalgae on Anaerobic Digestate for Wastewater Treatment and Biofuel Production. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 267 p.

Source: Masters Abstracts International, Volume: 81-03.

Thesis (M.S.)--University of California, Davis, 2019.

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

The use of microalgae for combined wastewater treatment and biofuel production has shown promise as a viable method for reducing oleaginous biomass production costs. Little work has been done to characterize the complex interactions that exist between microalgae, wastewater, and bacteria contained in these environments. This thesis focuses on three key areas: quantifying how microalgae grow and treat wastewater in semi‐continuous conditions, identifying the microbial community associated with microalgae in wastewater, and determining methods of lipid induction in microalgae growing on wastewater for biofuel production.The results suggest that (1) microalgae offer an efficient method of wastewater treatment in semi‐continuous conditions, (2) biomass production rates can be influenced by the microbial community that develops in the wastewater, and (3) lipid induction processes can radically increase the biofuel potential of this system in a short period. Microalgae grown on sterilized wastewater had maximum biomass productivity of 600 mg/L/d in 50% (v/v) semi-continuous conditions while removing 100% of N-NH4, 92.2% of TN, and 88.1% of sCOD. The microbial community that grew alongside microalgae in wastewater was found to be dominated by Proteobacteria. Despite this, each microalgae-based community that developed was unique and a large variation in the final microalgae biomass concentration (0.114 g/L to 0.890 g/L) was seen across the nine bioreactors. Specific OTUs were found to correlate with different parameters such as microalgae biomass concentration, bacteria biomass concentration, and nutrient removal rates of TN, N-NH4, and sCOD. Induced lipid accumulation in microalgae growing in wastewater showed that a two-stage process was effective. The addition of both sodium acetate and sodium chloride increased neutral lipid content by 73.97% in three days and 188.87% in six hours, respectively.These results show the potential for utilizing microalgae for a combined wastewater treatment-biofuel production system, but additional research needs to be performed to understand the microbial community and identified the ways this community affects the growth of microalgae and removal of nutrients from wastewater.

ISBN: 9781085795500Subjects--Topical Terms:

548583
Environmental engineering.

The Growth of Microalgae on Anaerobic Digestate for Wastewater Treatment and Biofuel Production.
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506 $a This item must not be sold to any third party vendors.
520 $a The use of microalgae for combined wastewater treatment and biofuel production has shown promise as a viable method for reducing oleaginous biomass production costs. Little work has been done to characterize the complex interactions that exist between microalgae, wastewater, and bacteria contained in these environments. This thesis focuses on three key areas: quantifying how microalgae grow and treat wastewater in semi‐continuous conditions, identifying the microbial community associated with microalgae in wastewater, and determining methods of lipid induction in microalgae growing on wastewater for biofuel production.The results suggest that (1) microalgae offer an efficient method of wastewater treatment in semi‐continuous conditions, (2) biomass production rates can be influenced by the microbial community that develops in the wastewater, and (3) lipid induction processes can radically increase the biofuel potential of this system in a short period. Microalgae grown on sterilized wastewater had maximum biomass productivity of 600 mg/L/d in 50% (v/v) semi-continuous conditions while removing 100% of N-NH4, 92.2% of TN, and 88.1% of sCOD. The microbial community that grew alongside microalgae in wastewater was found to be dominated by Proteobacteria. Despite this, each microalgae-based community that developed was unique and a large variation in the final microalgae biomass concentration (0.114 g/L to 0.890 g/L) was seen across the nine bioreactors. Specific OTUs were found to correlate with different parameters such as microalgae biomass concentration, bacteria biomass concentration, and nutrient removal rates of TN, N-NH4, and sCOD. Induced lipid accumulation in microalgae growing in wastewater showed that a two-stage process was effective. The addition of both sodium acetate and sodium chloride increased neutral lipid content by 73.97% in three days and 188.87% in six hours, respectively.These results show the potential for utilizing microalgae for a combined wastewater treatment-biofuel production system, but additional research needs to be performed to understand the microbial community and identified the ways this community affects the growth of microalgae and removal of nutrients from wastewater.
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