Suspended Solids Removal

Solids Removal- Suspended Solids Removal

The removal of suspended solids from wastewater refers to the removal of particles and floc to small or too lightweight to be removed in gravity settling.

These particles may have been brought over from secondary treatment or ppt in tertiary treatment.

Methods of removal

1           Centrifugation

2           Air Floatation

3           Mechanical Micro straining

4           Filtration (most common)

Filtration

Slow Sand Filters

This method is most successful as a polishing step in oxidation ponds. (Not suitable for effluent from conventional treatment due to clogging)

Granular-media Filtration

The bed comprise duel or multimedia beds and is most suited for effluent from secondary treatment

Moving Bed Filters

These are continuous cleaned, with the rate of cleaning adjusted to match the solids loading rate. This system as the ability to filter raw sewage.

Pulse-bed Filters

Compressed air is periodically injected to break up the thin surface mat of deposits.This system as the ability to filter raw sewage.

Solids Removal- Dissolved Solids Removal

Secondary treatment as well as nutrient removal decreases the dissolved organic solids present in WW. However, neither process completely removes ALL organic dissolved solids OR significant amounts of inorganic dissolved solids.

If substantial reduction in dissolved solids is required, further treatment would be needed. These techniques are similar to that used in the advanced treatment ofWater for removal:

Ion Exchange

Microporous Membrane Filtration Adsorption