In order to evaluate the settling of flocculated biomass, static column
settling tests were conducted using standard procedures employed
in the water treatment field [23]. The column had a total height of
45.5 cm, an internal diameter of 8.5 cmand four sampling ports at intermediate
depths (at 12.5, 20, 30 and 40 cm). Optimal doses found in jar
tests were used to perform four tests per flocculant. Specifically, two
tests per week (one for each flocculant) were performed during
1 month of experimentation. Each week, settling column test samples
were taken within 24 h to assure no variation on physicochemical
characteristics.
In order to evaluate the settling of flocculated biomass, static columnsettling tests were conducted using standard procedures employedin the water treatment field [23]. The column had a total height of45.5 cm, an internal diameter of 8.5 cmand four sampling ports at intermediatedepths (at 12.5, 20, 30 and 40 cm). Optimal doses found in jartests were used to perform four tests per flocculant. Specifically, twotests per week (one for each flocculant) were performed during1 month of experimentation. Each week, settling column test sampleswere taken within 24 h to assure no variation on physicochemicalcharacteristics.
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