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Impact of pH on the Removal of Cyanotoxins by Pac and Chlorine in Presence and Absence of Cyanobacterial Cells.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Impact of pH on the Removal of Cyanotoxins by Pac and Chlorine in Presence and Absence of Cyanobacterial Cells./
作者:	Rorar, Justin.
面頁冊數:	1 online resource (293 pages)
附註:	Source: Masters Abstracts International, Volume: 84-03.
Contained By:	Masters Abstracts International84-03.
標題:	Molecular chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29403537click for full text (PQDT)
ISBN:	9798841511724

Impact of pH on the Removal of Cyanotoxins by Pac and Chlorine in Presence and Absence of Cyanobacterial Cells.
Rorar, Justin.

Impact of pH on the Removal of Cyanotoxins by Pac and Chlorine in Presence and Absence of Cyanobacterial Cells. - 1 online resource (293 pages)

Source: Masters Abstracts International, Volume: 84-03.

Thesis (M.C.E.)--The University of Akron, 2022.

Includes bibliographical references

Cyanobacteria can produce cyanotoxins such as microcystin, saxitoxin, and anatoxin-a. These toxins are harmful to humans and other animals. This project focused on the removal efficiency of saxitoxin and anatoxin-a alone, as well as in the presence of microcystin-LR, by either powdered activated carbon (PAC) or chlorine. Furthermore, removal efficiency of these toxins by PAC was also determined in the presence of added active cyanobacterial cells in source water. PAC experiments were performed using distilled water and source water from the City of Akron Drinking Water Treatment Plant, located in northeast Ohio. pH had a significant impact on PAC results. Saxitoxin showed increased removal at higher pH levels in both distilled and source water. For instance, at pH 9 the removal was 48% in distilled water and 46-76% in source water, whereas it was 0-21% at pH 6 in distilled water and 23-47% in source water. Conversely, anatoxin-a showed increased removal at lower pH levels in distilled water, with 30-37% removal at pH 6 compared to 10-26% at pH 9 in distilled water. However, anatoxin-a removal increased at higher pH in source water with microcystin-LR added. For example, there was 31% removal at pH 6 compared to 65% and 59% removal at pH 7and 9, respectively. Microcystin-LR, when combined with either toxin, showed increased removal at higher pH levels in source water. pH 6 resulted in 9-45% removal and pH 9 resulted in 54-91% removal of microcystin-LR. Furthermore, the initial concentration of saxitoxin was a major factor, with the larger concentration (1.6 μg/L) resulting in 39% more removal in distilled water. On the other hand, in source water, the smaller STX concentration (0.3 μg/L) had 30% more removal. Finally, for PAC, the addition of cyanobacterial cells did not affect saxitoxin removal, however microcystin-LR removal decreased, with at least 14% reduction in removal efficiency across all pH levels. Chlorine experiments were performed using post-filtration water from the Akron Drinking Water Treatment Plant. The chlorination of these cyanotoxins were also highly dependent on pH. Saxitoxin degradation was most efficient at higher pH levels. For instance, pH 6 resulted in 13-43% degradation and pH 9 resulted in 56-74% degradation of saxitoxin. Conversely, chlorination of anatoxin-a and microcystin-LR were most efficient at lower pH levels. A pH of 6 resulted in 75% degradation and a pH of 9 resulted in 44% degradation of anatoxin-a. Furthermore, for microcystin-LR, pH 6 resulted in 76-92% degradation and pH 9 resulted in 7382% degradation. Lastly, a concurrent study that determined removal efficiencies of PAC and chlorine for the City of Alliance, Ohio will be compared.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798841511724Subjects--Topical Terms:

1071612
Molecular chemistry.
Subjects--Index Terms:

MicrocystinIndex Terms--Genre/Form:

542853
Electronic books.

Impact of pH on the Removal of Cyanotoxins by Pac and Chlorine in Presence and Absence of Cyanobacterial Cells.
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