Performance evaluation of up-flow thermophilic septic tank (UTST) in series for treating mixed wastewater from toilet and coffee shop | |
| Author | Varintorn Tiparadee |
| Call Number | AIT Thesis no.EV-21-20 |
| Subject(s) | Septic tanks--Thailand--Evaluation Wastewater--Treatment Anaerobic bacteria--Treatment |
| 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 | The growth of the Thai economy has made tourism in Thailand a vital business that can boost the economy. The petrol station is one of the places with a large number of users and huge generation of wastewater. However, the petrol station's wastewater treatment system is not well a functional treatment system as a result of improper design and maintenance free, leading to the release of waste that has a harmful effect on the environment. Effluent concentration of petrol station wastewater is still higher than petrol station Thailand standard. The purposes of this study were as follows: to optimize the proper HRTs to improve treatment performance of UTST in series; to determine kinetic model for further designing of this system; and to evaluate preliminary design for applying in the pilot scale. To improve treatment efficiency and contact of organic substance with sludge layer, this study is combination of two “Up-flow Thermophilic Septic Tank (UTST)” to connect in series, which was operated in thermophilic condition at 40◦C. First, 1st UTST reactor was operated at various HRTs, which were 8, 10 and 12 hr and 2nd UTST was operated at fixed HRTs of 12 hr. According to 1st UTST, HRT of 12 hr was the highest treatment performance of TCOD, FOG, TVS, TSS and TKN percent removal efficiency, which was 45, 47, 56, 44, 17%, respectively. The high efficiency of SCOD and TS was HRT of 10 hr which was 46 and 41%, respectively. There were the most significant differences of removal efficiency which are TCOD and FOG between 8, 10 and 12 hr. Operation of UTST in series at 24 hr was the highest treatment efficiency of TCOD, FOG and TKN that had percent removal of 70, 73 and 28, respectively. The highest treatment efficiency of SCOD, TS, TVS and TSS was HRTs at 22 hr. The average highest CH4 production of 1st and UTST in series was 1.47 and 4.31 L/d at HRTs of 12 and 24 hr, respectively. Optimum HRT for UTST in series was 24 hr. Second, completely mixed and first-order model were used to determined kinetic of this study. coefficient constant which was k20 of 1st UTST for TCOD and FOG removal was 0.8975 and 0.9655 d-1, respectively. Validated correlation (R2 ) of TCOD and FOG removal was 0.7988 and 0.5499 d-1, respectively. k20 evaluation of UTST in series was 1.2546 and 1.4566 d-1 , and R2 of validated TCOD was 0.9426. Lastly, results of UTST in series for treatment of major parameters for petrol station Thailand standard were not difference. Removal efficiency of TCOD, FOG and TSS was in range of 77-78, 78-83 and 68-73%, respectively. There were only TCOD and FOG passed standard. Caffeine which was an emerging contaminant from coffee shop wastewater was 53%. However, TSS which was still higher than standard and caffeine compound which was still high and effects on environment need to be treated by further treatment system Electrical consumption of 40◦C and ambient temperature operation was huge different which were 2.82 and 0.39 kWh/d, respectively. Treatment wastewater cost for one litter was also differences at 250 and 30 Baht/m3 . Due to scaling up to be pilot scale, ambient temperature operation in UTST in series was the most suitable. Preliminary design of TCOD effluent that was calculated from completely mixed and first-order kinetic model was still higher than standard. Therefore, application for pilot scale need to concern other factor coupled with kinetic model. |
| 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) | Chongrak Polprasert;Xue, Wenchao;Tatchai Pussayanavin |
| Scholarship Donor(s) | Royal Thai Government Fellowship;Bangchak Petroleum Public Company Limited, Thailand |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2021 |