Sewage Treatment Plant

Services offered in Screen Chamber

Screen Chamber

The first unit operation generally encountered in wastewater treatment plants is screening. A screen is a device with openings, generally of uniform size, that is used to retain solids found in the influent wastewater to the treatment pant. The principal role of screening is to remove coarse materials (pieces of wood, plastics, rags, papers, leaves, roots etc.) from the flow stream that could:

  • Damage subsequent process equipment e.g. pumps, valves, pipe lines, impellers.
  • Reduce overall treatment process reliability & effectiveness, or
  • Contaminate waste way

The Screen chamber components and configuration

The screen chamber is a big filteration screen that helps in eliminating big objects such as plastics that can stop the flow of sewer system.

Uses 1st step of sewage water solids removal
Instrument used screens
Screen Uses protecting valves, drains, pumps, unblocking sewage flow
Screen maintenance manual
Protective gear for hygiene required
Screen wire spacing distanced uniformly
Design straight wires
Channel rectangular
Channel floor 7-15cm < arriving sewer’s invert.
Channel bed flat / intended slope
Channel use trap grit
Minimum Bar racks required 2
Bar rack use manage sever flow
Flow stoppage system required
Channel draining systems essential
Flow entrance angle mooth diversion
Discharge structure proper

The mechanically maintained screens are much widely used in the industry; the bypass passage with another screen is added just to neutralise the malfunctioning of the mechanical variant. The screens are required to be cleared via the front side or back side.

The speed at which the water current flows can impact the screen, if the current is at low speed, there are number of objects getting trapped in the screen. The industrial activities utilize the screens but some of them do

Types of screen

Uses protection of sewer system components
Examples bar racks, wire design
Cleaning methods by hand, mechanical
Wire spacing 15-40mm

The smaller plants utilize the screens that require the cleaning via hand, but the large plants need a mechanical variant of this screen.

Bypass mode yes
Shredding method teeth

These grinders make use of the sharp tools that chop through the screenings

Variants fixed / static / wedge wire / drum / step
Static screen position vertical / horizontal / angular
Cleaning method mechanical via rakes and brushes
Size 0.035-6mm
Uses finer processing post abrasive screens application,
Other uses unclogging trickling filters.

These are not best suited for the sewage collections as their small size can easily trap a lot of dirt that will result in cluttering of the superfine screens, the portable screens are cleaned while they are being used or are in the mid of functioning , the centrifugal version of the screen makes use of the revolving screen

Screenings are disposed with municipal trash or burnt.

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