Upgrading of wastewater treatment plants with two-stage activated sludge process for reuse purposes | |
| Author | Karakade Amornrattanakiat |
| Call Number | AIT Thesis no. EV-98-24 |
| Subject(s) | Sewage--Purification--Activated sludge process Water reuse |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study aimed to find out the performance of two-stage activated sludge process on AIT domestic wastewater for reuse purposes. The batch processes of lab-scale were conducted to investigate the effects of organic loading, detention time (OT) and other parameters such as sCOD, NH3-N, N03-N, and TDP. The OT of both aeration tanks were varied from 1 to 5 hours. The organic loadings varied in the first aeration tank were 0.055, 0.071, and 0.080 gBOD/gMLVSS. The first aeration tank effluents from the organic loadings of 0.055, 0.071 , and 0.08 gBOD/gMLVSS were treated further in the second aeration tank at the MLSS in respect of 400, 900 and 400 mg/L. Based on the experiment, it was found that the organic loading and DT have significant roles on sCOD removal efficiency in two-stage activated sludge process. The 86% of overall sCOD removal was received from the two-stage activated sludge process. While the conventional activated sludge process (first aeration tank) gave the sCOD removal efficiency of 70% to 75%. Moreover, the allowable COD concentration for water reuse(< 20 mg/L) was achieved from the two-stage activated sludge process within 2 hours (at the DT combination of 111), while in the conventional activated sludge process (first aeration tank) it was achieved within 4 hours. In the case ofNH3-N, it was rapidly changed into N03-N within 3 hours, while the N03-N and TDP were not removed in both aeration tanks. Comparing the effluent quality at the optimum condition with Guidelines for water reuse, it was concluded that it is possible to reuse the effluent directly for non-strict purposes such as non-direct contact domestic use and gardening for non-commercial plants. |
| Year | 1998 |
| 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) | Samorn Muttamara; |
| Examination Committee(s) | Nguyen T. Kim Oanh ;Dahl-Madsen, Karl Iver; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1998 |