UV disinfection of E.coli and Ascaris Lumbricoides Ova in liquid effluent from on-site sanitation systems | |
| Author | Kanokwan Wangchina |
| Call Number | AIT Thesis no.EV-15-10 |
| Subject(s) | Escherichia coli Ascaris Lumbricoides Sanitation |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-15-10 |
| Abstract | Liquid effluent from on-site sanitation treatment still presents enteric pathogens. Those pathogens increase the threat of public exposure to disease. One of the most common advanced treatment methods is ultraviolet (UV) disinfection. UV disinfection with conventional lamps has been applied for water and wastewater treatments. UV LEDs are a new beneficial alternative kind of UV disinfection preferred good solutions for the treatment. The aim of this study was to compare 3 types of UV disinfection systems (UV LEDs, UVB lamp and UVC lamp) for disinfection of enteric pathogens (bacteria pathogens: total coliform and Escherichia coli (E.coli), enteric helminth pathogen: Ascaris Lumbricoides egg) in the liquid effluent from on-site sanitation systems. UV dose was determined by radiometry and chemical actinometry (iodide-iodate actinometer) method. Cesspool supernatants and septic tank effluent were selected to conduct the disinfection efficacy test. UV wavelengths applied in this study and measured by spectroradiometer were 277.53±0.3 nm, 302.02±0.3 nm and 253.79±0.3 nm for UV LEDs, UVB lamp and UVC lamp, respectively. UV doses were determined by using irradiances from spectroradiometer with correction factors involved based on effluent types. For E.coli disinfection efficacy at 2 log-reduction, UV LEDs were the most effective based UV dose required, however UVC lamp had the highest efficiency based on exposure time of disinfection. Ascaris Lumbricoides eggs after UV exposure and 28 days incubation did not change with equal exposure time of total coliforms. Thus, the exposure time should be prolonged for helminth inactivation. |
| Year | 2015 |
| 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) | Thammarat Koottatep; |
| Examination Committee(s) | Chongrak Polprasert;Shipin, Oleg V.; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2015 |