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Comparative study of different pre-treatment alternatives

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.

TitleComparative study of different pre-treatment alternatives
Publication TypeJournal Article
Year of Publication1993
AuthorsVisscher, J.T., Galvis C., G., Fernandez, J.
Paginationp. 337-346: 7 fig., 5 tab.
Date Published1993-01-01
Keywordsbacteriological 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.

Notes17 ref.
Custom 1255.1, 255.4

Disclaimer

The copyright of the documents on this site remains with the original publishers. The documents may therefore not be redistributed commercially without the permission of the original publishers.