» Sewage & Effluent Treatment Process
Sewage & Effluent Treatment Process
We provide several treatment processes based on
type and reuse of sewage or domestic wastewaters including :
- Activated sludge
- Extended Aeration
- Trickling Filters
- FAB process
and a carefully selected combination of these processes where needed in
removing BOD from industrial wastewaters.
The plants are available in steel or concrete construction. Small plants
for hotels, small societies, hospitals are available as compact packaged
Our designs provide superior Preliminary Treatment
that is easy to operate and ensures trouble free plant operations :
Screening - larger solids (plastics, rag, woody material) are
removed first by mechanical screens.
Grit removal - At the next preliminary stage, fine mineral matter
(grit and sand), originating mainly from road runoff, is allowed to deposit
in long channels or circular traps. It is important to control the flow
velocity at peak flows to ensure good grit removal. Grease removal is also
done with carefully designed baffle plates. Our designs provide balanced
hydraulics making it very effective.
Primary Treatment Sedimentation
Depending on the size of the plant and nature of
suspended solids, we provide primary clarification if necessary. This
reduces power load on secondary biological treatment but primary
clarification generates sludge that needs to be stabilized.
Secondary (biological) Treatment
Settled sewage then flows to an aerobic biological
treatment stage where it comes into contact with micro-organisms which
remove and oxidize most of the remaining organic pollutants. Air is supplied
to enhance the bacterial action removing 90 99% organic waste.
Coarse to medium bubble Diffusers from made by us provide a rugged
alternative to the plastic / rubber membrane diffusers. Membrane diffusers
get ruptured making entire aeration system inefficient. Our diffuser design
is known to last decades without any need for maintenance or replacement.
Following biological treatment, the wastewater passes to final settlement
tanks where most of the biological solids are deposited as sludge (secondary
sludge) while the clarified effluent passes to the outfall pipe for
discharge after an effective disinfection using chlorine, UV or
For reuse of water in horticulture, cooling towers,
toilet flushing , etc. water from secondary treatment we provide further
treatment using sand and carbon filters. This brings clarity to water and
removes smells from it. Additional stages of ion exchange and RO are also
used depending on final application of treated water.
For small treatment plants, sludge is completely
stabilized using air before it can be put on drying beds. However in large
plants sludge produced can provide useful biogas for use as fuel. We provide
several sludge thickening and dewatering technologies like thickeners,
filter press and centrifuge.