| Author | Nishimura, Sosuke |
| Call Number | AIT Thesis no.EV-92-03 |
| Subject(s) | Sewage lagoons
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering
NOTE |
| Publisher | Asian Institute of Technology |
| Abstract | Water samples collected from two stabilization pond systems
(AIT ponds in Patumthani province , and Rama IX ponds in Bangkok
city , Thailand) were analyzed to correlate the densities of
indicator microorganisms , namely , fecal coliform and coliphage, to
the presence of pathogenic bacteria such as ViJJrio clwlerae, Salmonella , and Shigella. Out of 103 pond water samples, 84
samples were found to contain v. clwlerae.
Statistical analysis showed that both fecal coliform and
coli phage had good correlations with the presence of V. clwlerae
though coliphage was less reliable. The proportions of V. clwl erae- posi ti ve samples were significantly h igher in the high fecal
coliform sample group ( > 8000 fecal coliforms per 100 mL) than in
the low fecal coliform sample group ( 5 8000 fecal coliforms per
100 mL). As for coliphage, the threshold level was found to be
1300 coliphages per 100 mL.
The percentage of V. clwl erae positive sample s (percent VC -
pos itive) in the total number of samples was calculated for each
sampling point to analyze quantitative relationships between the
V. chol erae presence and the indicator densities. Two 1 inear
regression formulas were developed to estimate the percent VCpositive based on fecal coliform or col iphage d ensity. Applying
the concept of the most probable number (MPN) t e st, a formula to
estimate the MPN of V. cholerae based on the percent VC - posi tive was
s ugge sted . Using the thre e formulas mentione d a bo ve , approx ima t e
c once ntration of V.cholerae in pond water could be estimate d from
fe c al c oliform or coliphage density. |
| Year | 1992 |
| Corresponding Series Added Entry | Asian Institute of Technology.|tThesis ;|vno.EV-92-03 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Chongrak Polprasert |
| Examination Committee(s) | Samorn Muttamara;Tran, Francis T. |
| Scholarship Donor(s) | The Government of Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1992 |