Comparison of down-flow Hanging Sponge and Woven fiber membrane systems for treatment of polluted canal water | |
| Author | Tembo, Ellis Lloyd Andrew |
| Call Number | AIT Thesis no.UWEM-14-01 |
| Subject(s) | Water quality--Thailand Water reuse--Thailand |
| Note | 81 p. : ill. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. UWEM-14-01 |
| Abstract | This study investigated the performance of the Down-flow Hanging Sponge (DHS) systemin treating mildly polluted canal water. The DHS system and the Woven Fiber Microfiltration (WFM) were operated parallel to each other for performance comparison and the two systems were fed with the same wastewater. The research was carried out with laboratory scale DHS and WFM modules and the experiment was set up at the AIT EEM research station. Both systems were operated under ambient physical conditions. The feed wastewater comprised of a mixture of pond water and septage. This mixture had characteristics close to those of a typically polluted canal with COD concentration of 140 ± 20 mg/L. For the DHS reactor, the experiment was conducted under three concurrent operational runs,with differingorganic loading rates (OLRs) of 1,2 and3 kg COD/m3.d. Cleaning of the WFM was done by drying the module in the sun. The experiment was carried out over a period of over 100days.The results showed that the DHS system achieved removal efficiencies of 77 %, 84.7%, 80% for COD, BOD5, TKN respectively and1.4 log removal for total coliform, at an OLR of 1 kg COD/m3.d. At an OLR of 2 kg COD/m3.d, the DHS reactor achieved 76% COD removal, 84%BOD removal, 72%TKN removaland1.2 log removal of total coliform. The removal efficiencies at the OLR of 3 kg COD/m3.dwere86% 89% 90%, 95%, for COD, BOD5, TKN, respectively and 1.3 log removal of total coliforms. The effluent of the DHS system met reuse standards at all OLR. The average removal efficiencies for the WFM were 70% for COD, 70% for BOD5, 40% for TKN and 0.5 log removal for total coliforms. These removal efficiencies were all lower than those of the DHS reactor, and did not meet reuse standards. During the study, cleaning of the WFM was done by drying the membrane in the sun. The membrane performance after the cleaning did not diminish, showing that the cleaning method was effective. The optimum OLR for the DHS reactor was found to be 1 kg COD/m3.dand at this OLR. The WFM average permeate flux was only 2 L/m2.h, which is not economically desirable. It was concluded that the DHS is a more efficient system than the WFM for treating dilute wastewater. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. UWEM-14-01 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Urban Water Engineering and Management (UWEM) |
| Chairperson(s) | Visvanathan, C.;Vazquez, Carlos Manuel Lopez; |
| Examination Committee(s) | Shrestha, Sangam;Shipin, Oleg V.; |
| Scholarship Donor(s) | Bill and Melinda Gates Foundation/ UNESCO-IHE; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology - UNESCO-IHE, 2014 |