A low-cost substrate of constructed wetlands for treating solar septic tank effluent | |
| Author | Preechaya Kaewsuwan |
| Call Number | AIT Thesis no.EV-21-16 |
| Subject(s) | Sewage sludge--Purification--Biological treatment Constructed wetland Septic tanks |
| 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 |
| Abstract | With increasing demand for tap water and treatment volumes, by-products from water treatment plants - water treatment sludge (WTS) are increasing, and final disposal must be addressed urgently. Hence, the recycling of WTS not only solves the problem of "waste" but also brings great economic benefits. This study used WTS to prepare normal effective water treatment sludge composite substrates (WTSCS) for the removal of phosphorus and nitrogen in constructed wetlands using WTS as the main material and cement, bentonite and zeolite as additives. The optimum weight ratio of WTSCS was determined by combining experiments, test and mix design: WTS = 51.62%, cement = 22.32%, bentonite = 13.03%, and zeolite = 4.34%. In pilot-scale WTS-CW experiments with media WTSCS, maximum removal performance of 96% Total Phosphorus (TP) was achieved by WTS-CW3 at HRT of 36 h with influent TP > 5 mg/L. Similarly, both WTS-CW1 and WTS-CW2 were able to be removal performance 93% and 91% respectively. The pilot-scale of WTS-CW3 operating at HRT at 36, 20, and 10 h, achieved satisfactory NH3-N efficiency greater than 94% (p <0.05), while WTS-CW1 and WTS-CW2 could be removed NH3-N in the efficiencies of 89% and 87% respectively. The highest treatment performance of HRT for the WTS-CW was found that is 36 h when considering organics and solid removal, nutrient reduction, and pathogenic inactivation. However, when depending on the National standard of Thailand, it can be used to treat at HRT 10 h. The overall performance of the WTSCS that is media non-burning was therefore not better than media was burned or call ceramsite reported in the literature. But does not mean it cannot be used considering the production cost as well. Therefore, WTSCS is suitable for the low-cost CW |
| Year | 2021 |
| 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) | Thammarat Koottatep; |
| Examination Committee(s) | Xue, Wenchao;Ekbordin Winijkul; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2021 |