Effects of quantitative shock loadings on the constant recycle sludge concentration activated sludge process | |
| Author | Wong, Yiu Ki |
| Call Number | AIT Thesis no. 880 |
| Subject(s) | Sewage|--Purification--Activated sludge process Factory and trade waste |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science of the Asian Institute of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | The reliability of the new model (RAMANATHAN and GAUDY model) for completely mixed activated sludge treatment holding the recycle cell concentration XR as a system constant, with respect to step changes in hydraulic retention time was investigated. The experiments were r un at initial dilution rates of 1/8, 1/6, 1/4 and 1/2 hr-i . The influent substrate concentration was maintained at 1000 mg/l COD and the hydraulic recycle ratio 0.3. The recycle sludge concentration was about 7000 mg/l. It was found that the steady state results obtained were comparable with that of DURA (1975) operated under the same conditions. The system can accommodate hydraulic shock loads up to 200% positive changes and down to 50% negative changes without disrupting the effluent quality. Shorter retention time (in the range studied, D = 1/8, 1/6, 1/4 hr-i) has the advantage of shorter response time with respect to the response of biological solids. Formulae for the evaluation of transient values of specific growth rate (µ) and cell yield (Y) were derived. However, while they can be used to observe the pattern of changes of µ and Y they did not give the true transient values. The variations of µ and Y during the transient period make prediction of biological solids (X) and substrate level (S) difficult. |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Yang, Yi Ping |
| Scholarship Donor(s) | Government of Canada |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1975 |