Explain about the primary treatment step in waste water treatment process?
The primary treatment process of the wastewater treatment procedure eliminates
materials that are going to settle or float; it comprises of several steps, which includes;
screening (physical process)
Screens are created out of narrow long metal bars, restricting bulky floating objects from
clogging up the pipes. On the other hand, comminatory is applied by grinding the debris that
hurls through the screens. Later sedimentation process (floating process) removes the ground
materials. Furthermore, grit chambers are made to hold certain solids (such as coffee grounds,
sand) from passing through and settling on the water, while grit results in excessive corrosion of
the pumps and pipes. Its disposal in cities combines with sewer systems to carry sand slit and
gravel that surface during the rain. Solids that are usually suspended pass through grit and screen
chambers are dispensed in sedimentation tanks from the sewage. Sedimentation tanks (primary
clarifiers) give two hours for gravity to settle, while the sewage flows through the objects slowly
sink to the ground. Then, the settled solids (sludge) are taken along by mechanical scrappers in
the tank bottom; sludge is then pumped out for disposal. At the same time, the mechanical
devices (surface-skimming) dispose of floating objects and grease.