Water Treatment Plant

Water Filtration is done in order to remove colloidal and suspended matter remaining after sedimentation and to remove bacterial load. The process of filtration usually consist of allowing the water pass through thick layer of sand or porous material which retain coarse impurities on its surface and in pores.- The apparatus used for filtration is called filter and the porous material that fill the filter is known as filtering medium.

Types of Water Treatment Filter:

  1. Single flow closed pressure filter
  2. Horizontal flow pressure filter
  3. Dual media filter
  4. Inflow Sand Filter
  5. Mechanical Filter- Radical Filter- Multiple Chamber Filter

The water compounds are classified into three categories :suspended solids, colloidal particles (less than 1 micron) and dissolved substances (less than several nano meters).The coagulation-flocculation processes facilitate the removal of SS and colloidal particles. It’s used in the final stage of solids-liquids separation: settling, flotation or filtration.Coagulation is the destabilization of colloidal particles brought about by the addition of a chemical reagent called as coagulant.

Activated Sludge Process- This is most versatile biological oxidation process employed for the treatment of waste water contain dissolve solid, collides, coarse solid and organic matter.- Sewage from sedimentation tank enter into aeration tank. Here 20 – 30% of active sludge is mixed. The mixture is aerated and mixed in the tank for about 4 to 8 hours .- An efficient aeration for 3 – 6 hour is occupied for sludge while for industrial waste 6 – 24 hour of aeration is required.- The microorganism oxidize organic matter , in the presence of abundant quantity of oxygen in the aeration tank. Sewage is allowed to settle in secondary sedimentation tank.- This settled sewage has undergo aeration and has active microorganism. So some portion of activated sludge is recalculated in to the aeration tank.