Escherichia coli die-off in swine wastewater lagoons

In Malaysia, pig farming grew rapidly due to high demand. It is one of the most polluting livestock industries in Sarawak resulting in water and air pollution. Escherichia coli (E. coli) is used as an indicator for water quality and for possible presence of pathogenic microorganisms in water. Thi...

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Main Author:	Then, Yin Ping
Format:	Thesis
Language:	English
Published:	2007
Subjects:	Q Science (General) QR Microbiology
Online Access:	http://ir.unimas.my/id/eprint/28813/2/Escherichia%20coli%20Die-Off%20in%20Swine%20Wastewater%20Lagoons.pdf
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id	my-unimas-ir.28813
record_format	uketd_dc
spelling	my-unimas-ir.288132023-05-09T04:07:00Z Escherichia coli die-off in swine wastewater lagoons 2007 Then, Yin Ping Q Science (General) QR Microbiology In Malaysia, pig farming grew rapidly due to high demand. It is one of the most polluting livestock industries in Sarawak resulting in water and air pollution. Escherichia coli (E. coli) is used as an indicator for water quality and for possible presence of pathogenic microorganisms in water. This study is done to determine the biotic and abiotic effect on E. coli survival, the predominant factor in E. coli die-off, comparing survival in laboratory and field studies, and to evaluate wastewater lagoons efficiency. Wastewater samples for the laboratory studies were collected from wastewater lagoons of a farm in Gedon0 t was observed that E. coli population increased and maintained at high concentration in sterile wastewater compared to the non-sterile wastewater under the same condition in the laboratory study. This is possibly due to biotic factor as protozoa number was found to increase up to 8 10glO unitlmL as E. coli population dropped. Results showed that E. coli removal was enhanced by lethal pH - with pH level of more than 9 in the laboratory study. The study of E. coli survival was carried out in the laboratory and also in the field. The die-off rates ranged from 0.144 d· l to 2.835 d· l in laboratory study. Under field investigation (field batch study), the die-off rates ranged from 0.172 d· l to 1. 767 d· l . In both laboratory and field batch studies, E. coli decay rates in the wastewater from Lagoon 2 (L2) and Lagoon 3 (L3) were found to be much higher than in primary lagoons, Lagoon lA (LIA) and Lagoon IB (LIB). In both studies, it was found that there was no significant difference between die-off rates in LIA and LIB wastewater. In the field experiment, the two 7 -day field studies in September and October 2005 showed that E. coli concentrations dropped 2 10glO units after wastewater flowing through the lagoons. In addition, the lagoon system in the farm studied resulted in E. coli reduction with highest percent reduction occurred in L2 (74.9%). Correlation analysis showed that E. coli die-off rates were highly and significantly correlated with DO and pH levels. Universiti Malaysia Sarawak (UNIMAS) 2007 Thesis http://ir.unimas.my/id/eprint/28813/ http://ir.unimas.my/id/eprint/28813/2/Escherichia%20coli%20Die-Off%20in%20Swine%20Wastewater%20Lagoons.pdf text en validuser masters Universiti Malaysia Sarawak (UNIMAS) Faculty of Resource Science and Technology
institution	Universiti Malaysia Sarawak
collection	UNIMAS Institutional Repository
language	English
topic	Q Science (General) QR Microbiology
spellingShingle	Q Science (General) QR Microbiology Then, Yin Ping Escherichia coli die-off in swine wastewater lagoons
description	In Malaysia, pig farming grew rapidly due to high demand. It is one of the most polluting livestock industries in Sarawak resulting in water and air pollution. Escherichia coli (E. coli) is used as an indicator for water quality and for possible presence of pathogenic microorganisms in water. This study is done to determine the biotic and abiotic effect on E. coli survival, the predominant factor in E. coli die-off, comparing survival in laboratory and field studies, and to evaluate wastewater lagoons efficiency. Wastewater samples for the laboratory studies were collected from wastewater lagoons of a farm in Gedon0 t was observed that E. coli population increased and maintained at high concentration in sterile wastewater compared to the non-sterile wastewater under the same condition in the laboratory study. This is possibly due to biotic factor as protozoa number was found to increase up to 8 10glO unitlmL as E. coli population dropped. Results showed that E. coli removal was enhanced by lethal pH - with pH level of more than 9 in the laboratory study. The study of E. coli survival was carried out in the laboratory and also in the field. The die-off rates ranged from 0.144 d· l to 2.835 d· l in laboratory study. Under field investigation (field batch study), the die-off rates ranged from 0.172 d· l to 1. 767 d· l . In both laboratory and field batch studies, E. coli decay rates in the wastewater from Lagoon 2 (L2) and Lagoon 3 (L3) were found to be much higher than in primary lagoons, Lagoon lA (LIA) and Lagoon IB (LIB). In both studies, it was found that there was no significant difference between die-off rates in LIA and LIB wastewater. In the field experiment, the two 7 -day field studies in September and October 2005 showed that E. coli concentrations dropped 2 10glO units after wastewater flowing through the lagoons. In addition, the lagoon system in the farm studied resulted in E. coli reduction with highest percent reduction occurred in L2 (74.9%). Correlation analysis showed that E. coli die-off rates were highly and significantly correlated with DO and pH levels.
format	Thesis
qualification_level	Master's degree
author	Then, Yin Ping
author_facet	Then, Yin Ping
author_sort	Then, Yin Ping
title	Escherichia coli die-off in swine wastewater lagoons
title_short	Escherichia coli die-off in swine wastewater lagoons
title_full	Escherichia coli die-off in swine wastewater lagoons
title_fullStr	Escherichia coli die-off in swine wastewater lagoons
title_full_unstemmed	Escherichia coli die-off in swine wastewater lagoons
title_sort	escherichia coli die-off in swine wastewater lagoons
granting_institution	Universiti Malaysia Sarawak (UNIMAS)
granting_department	Faculty of Resource Science and Technology
publishDate	2007
url	http://ir.unimas.my/id/eprint/28813/2/Escherichia%20coli%20Die-Off%20in%20Swine%20Wastewater%20Lagoons.pdf
_version_	1783728362537091072

Escherichia coli die-off in swine wastewater lagoons

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