Treatment of solar septic tank effluent by lateritic soil-based constructed wetlands | |
| Author | Suphatchai Rujakom |
| Call Number | AIT Thesis no.EV-16-21 |
| Subject(s) | Septic tanks Constructed wetlands Wetlands |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-16-21 |
| Abstract | In this study, the lateritic soil containing high Fe mineral was used as media in CW as well as the less Fe content soil to be the controlling unit. The optimum HLR for this system was found to be 0.09 m³/m².day when considering about treatment performance. Vetiveria zizanioides was planted into the system to figure out the differences between the unplanted and the planted CW system with the optimum HLR. The results show that both kinds of soil were satisfactory for pollutants abatement. Chemical oxygen demand (COD), Biochemical oxygen demand (BOD5) and total suspended solid (TSS)in the CW effluent could achieve the national standard of Thailand. The results from the operated optimum HLR presented COD removal efficiency of 81 to 94%. BOD5, TSS, VSS were removed about 95 to 98%, 90 to 94% and 95to 97%, respectively. Reduction of E. coli and fecal coliform were about 1.9 to 3.6 log and 2.2 to 3.3 log, respectively. Moreover, the results also shows that there are slightly different between laterite and general soil experiments. For most of selected parameter, CW unit with general soil can perform better than CW unit with lateritic soil except total phosphorus which was removed by CW unit with lateritic soil around 95% whereas CW unit with general soil can remove only around 55%. The main removal mechanism of this system is filtration process, likely depending on the porosity of soil media. However, adsorption of NH3-N and TP could also take place in the system, especially in CW unit with lateritic soil. However, most of the selected parameters from HLR of 0.08 to 0.47 m³/m².day can treat septic tank effluent to meet the national standard of Thailand; so that, the higher HLR should be selected as an optimum HLR for the further study to see how different from this study as well as mass balance of the selected parameters are also recommended for the further study. |
| Year | 2016 |
| 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) | Annachhatre, Ajit P.;Chongrak Polprasert |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2016 |