Performance of a rotating drum filter in treatment of wastewaters in the tropics | |
| Author | Enayatullah |
| Call Number | AIT Thesis no. 825 |
| Subject(s) | Water quality management Sewage disposal Sewage--Purification--Filtration |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | Performance studies were carried out on a single-stage once-through pilot scale rotating drum biological filter packed with polyethylene spheres as filter media for treatment of two industrial wastewaters tapioca starch waste with BOD averaging 4230 mg/l and soft drink bottling plant waste with BOD averaging 790 mg/l. Tests revealed that in the range of organic loading studied maximum soluble BOD removal efficiencies of 81.8 percent and 98 percent were achieved at areal BOD loadings of 143 and 29.5 g/m2 day, corresponding to volumetric BOD loadings of 14 and 2.92 Kg/m3 drum-day in treating tapioca starch and soft drink bottling wastes, respectively. The tests also indicated that it was not beneficial to increase the filter contact chamber volume since it decreased the areal density as well as the degree of mixing of the mixed liquor and hence adversely affected the efficiency of the filter. Studies were also carried out on the performance of a 30 cm diameter rotating drum as a surface aerator in comparison with a 12 cm diameter turbine aerator on pilot scale lagoons treating domestic sewage with COD averaging 251 mg/l. The results indicated that at detention periods higher than 3 days the removal efficiencies of the two lagoons were equally good but at detention periods lower than 3 days the removal efficiency of the drum aerator was higher than the turbine aerator. At 5 days detention period a COD removal of 97 percent was achieved by each of the mentioned lagoons. Power consumption of the drum aerator was found to be 3.8% less than that of the turbine aerator. |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Pescod, M.B. |
| Examination Committee(s) | Ouano, E.A.R. ; Yang, Yi Ping |
| Scholarship Donor(s) | Government of New Zealand, |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |