The results of an ongoing comparative study of different pre-treatment alternatives based on two stages of roughing filtration are presented.
| Title | Comparative study of different pre-treatment alternatives |
| Publication Type | Journal Article |
| Year of Publication | 1993 |
| Authors | Visscher, JT, G. C., G, Fernandez, J |
| Pagination | p. 337-346: 7 fig., 5 tab. |
| Date Published | 1993-01-01 |
| Keywords | bacteriological quality, colombia, comparative analysis, downflow roughing filtration, dynamic roughing filtration, faecal coliforms, horizontal roughing filtration, pilot plants, plate settlers, pretreatment, sedimentation, slow sand filtration, suspended solids removal, upflow roughing filtration |
| Abstract | The results of an ongoing comparative study of different pre-treatment alternatives based on two stages of roughing filtration are presented. The first stage is oriented mainly to cope with coarser suspended solids and the second with finer particles and micro-organisms. They are part of experimental lines which include slow sand filters in the treatment stage. These lines are processing raw water from a polluted tropical lowland river, the Cauca river in Colombia. The findings support the need to take into account not only suspended solids or turbidity levels, but more importantly, the sanitary risk involved in a particular water source and the operation and maintenence requirements when planning and designing roughing filters.The two stages of roughing filtration represent around 3 logaritmic units of the overall 5.5. log units reduction of faecal coliform bacteria that the experimental lines are now consistently reaching. |
| Notes | 17 ref. |
| Custom 1 | 255.1, 255.4 |
