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Civil - Environmental Engineering - Sewage Treatment

Suspended Solids Removal

   Posted On :  10.07.2016 01:45 am

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.

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

 

Tags : Civil - Environmental Engineering - Sewage Treatment
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