Wastewater reuse and quantitative microbial risk assessment in Ban Sok Noy Village, Vientiane Capital, Lao PDR | |
| Author | Vilaysack Longaphai |
| Call Number | AIT Thesis no.EV-12-21 |
| Subject(s) | Sewage Recycling Laos Water Purification Microbial removal Laos Sewage Safety measures Laos |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environment Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-12-21 |
| Abstract | Nowadays, wastewater reuse is widely acknowledged as a pathway of infectious pathogens. There are a lot of causes to contaminate the water such as poor sanitation, wastewater leakage etc. In this study, both sources of water and wastewater canal in Ban Sok Noy village, Lao.PDR have been contaminated with pathogens. Due to the reason that septic tank or cesspool did not construct properly and poor sanitation. Thus, the barrier on transmission pathways of pathogenic organisms could be set and enforced in Lao.PDR. In order to determine health risks due to sources of water were contaminated with pathogens, the Quantitative Microbial Risk Assessment (QMRA) was conducted by using microbial data of E.coli and Salmonella spp. The results were comparison with previous researches. Overall water contamination level was high, leaching from fecal sludge in the septic tank or cesspool nearly waterways, especially from cesspools were found the major pathogen contributors and wastewater in the canal was high amount of pathogens too. Estimated mean values of yearly infection risks from accidental ingestion of wastewater from swimming were at the range of 27 - 78cases per 10,000 population for E.coli and 30 - 66 cases per 10,000 population for Salmonella spp. that were significantly higher than acceptable risk defined by WHO, and thus require immediate establishment of local regulations to restrict the using of wastewater from the canal. Besides, it was identified that E.coli could serve only as an indicator of the presence of other pathogenic organisms but tend to significantly underestimate infection risks posed by other enteric bacteria including Salmonella spp. |
| Year | 2012 |
| 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 and Management (EV) |
| Chairperson(s) | Thammarat Koottatep; |
| Examination Committee(s) | Annachhatre, Ajit P.;Nguyen, Thi Kim Oanh; |
| Scholarship Donor(s) | Sweden (Sida); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2012 |