Experimental investigation of reuse potential of secondary treated effluent | |
| Author | Khambay Vongsayarath |
| Call Number | AIT Thesis no.EV-00-7 |
| Subject(s) | Water reuse Water--Purification |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This study experimentally investigates the reuse potential of secondary treated effluent for near potable quality water use for purposes such as washing, toilet flushing, floor flushing and other domestic non-potable uses in AIT campus. An estimated quantity of over 1,800 m3/day of potable water is consumed in AIT, which is provided by the Provincial Water Works Authority of Thailand at the rate of 13 Baht/m3 . A pilot-scale tertiary treatment was operated in two modes. The first type was a rapid sand filter, which consisted of coagulation, flocculation, sedimentation and dual media filtration. The treated effluent has pH in the range of 6.3 to 7.2, average turbidity of 0.8 NTU, SS of 2.3 mg/L, DS of 220 mg/L, TOC of 8 mg/L. Where as the total and fecal coliform were obtained in the range of 4700 to 970 and 510 to 370 NPM/l OOmL respectively. The second type was a membrane filtration that was operated in the sh01t-term of experiment. Two different types of membrane were used. Each type was operated in three schemes at different mode. The first type was a woven fiber filtration system membrane, which used air backwashing. The treated effluent result did not meet the standards, but the flux was higher than the other type of membranes. The treated effluent of scheme II has a pH of 6.8, turbidity of 4.6 NTU, SS of 6.8 mg/L, DS of 188 mg/L, TOC of 8.9 mg/L, total and fecal coliform were obtained of 5600 and 530 MPN/l OOmL, respectively. The analysis results of scheme I and scheme III were slightly different from scheme II. In the second type of membrane was dead-end hollow fiber microfiltration membrane, which operated in three schemes as same as the first type of membrane, but different mode of operation. This mode used water backwashing and blow by week air diffuser. The treated effluent of scheme II has a pH of 6.5, turbidity of 0.9 NTU, SS of 2 mg/L, DS of 174 mg/L, TOC of 6 mg/L, total coliforms of 390 MPN/lOOmL and fecal coliforms of 103 MPN/lOOmL. The scheme I and scheme III were slightly different of the analysis results in scheme II. |
| Year | 2000 |
| 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) | Visvanathan, C.;Chongrak Polprasert |
| Examination Committee(s) | Nguyen Cong Thanh;Preeda Parkpian |
| Scholarship Donor(s) | Swedish International Development Cooperation Agency |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |