Disinfection of septic tank effluent by nano-silver coated granular activated carbon | |
| Author | Jaruwat Watanatanachart |
| Call Number | AIT Thesis no.EV-14-16 |
| Subject(s) | Septic tanks Nanoparticles Sewage--Purification |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-14-16 |
| Abstract | Goal of this research was to apply nano-silver coated on granular activated carbon (NS-GAC) as a post treatment unit in disinfecting septic tank effluent. This study selected Escherichia coli and total coliform as pathogen indicators. Experiments were conducted in 3 parts: (i) nano-silver coated granular activated carbon was synthesized by polyol process using silver nitrate (AgNO3) and ethylene glycol (EG) used as an oxidizing and reducing agent whereas polyvinylpyrrolidone (PVP) was used as a stabilizer that can also expedite the reaction; (ii) optimized operating conditions were studied in up-flow and down-flow regimes with various HRT, (iii) breakthrough point of NS-GAC was studied in up-flow patterns to reduce clogging problems in columns. Characterization of NS-GAC were undertaken by SEM (scanning electron microscope) and BET (Brunauer-Emmett-Teller) surface area analysis. Surface of GAC was covered with silver nano-particles which also replaced porosity. Specific surface areas of NS-GAC were found to be 458.49 m²g-1. Optimized operating conditions for NS-GAC were found to be both in up-flow and down-flow regimes with a view to reducing E.coli and total coliforms more than 4 log units within a retention time of 1 min. Breakthrough point of NS-GAC in 3 HRT were established while kinetic value of NS-GAC operating at HRTs of 10, 20 and 30 min was in the range of 0.72-2.27 day-1. |
| Year | 2014 |
| 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) | Shipin, Oleg V.;Chongrak Polpasert |
| Scholarship Donor(s) | Bill & Melinda Gates Foundation through the Sustainable Decentralized Wastewater Management in Developing Countries Project |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2014 |