BIO Sewage Treatment

Flow meter

Continuously monitors the amount of sewage entering the plant and adjusts for constantly changing level automatically. 

Biotrickling filter

The plant recently installed a biotrickling filter for removing H2S gases, the primary source of foul orders from incoming sewage.

Grit removal basin

After removal of a large objects by the bar screen, incoming through the grit removal basin where inorganic gravel/pebbles and dirt settle out by gravity in the shallow basins

Pump station

Pumps sewage into the primary clarifier and it flows through the rest of plant to the river.

Primary clarifier

A large tank in which suspended material or organic fecal material settles out and is collected by a scraper system at the bottom of the tank. This material is pumped to the anaerobic digester where the volume of solids is reduce greatly.

Aeration basin

The top fluid portion of the primary clarifier which contains about 10% of the fecal material is mixed with aerobic microorganism that break down fecal material.

Final clarifier (secondary clarifier)

The aerobic microorganisms from the aeration basing style out as “activated sludge”. Part goes back to the aeration basin where it starts digesting incoming sewage, other part is pumped back to the aerobic digester.

UV light station

During the final stage of sewage treatment the fluid portion flows through UV-lighted tubes to kill any remaining microorganisms before the water is returned to the river systems.

Anaerobic digester

Digest inorganic fecal material from the primary clarifier. This digestion is done in the absence of oxygen by anaerobic microorganisms.

Aerobic digester

Activated sludge which came from the final clarifier is greatly reduced in volume in the aerobic digester. The activated sludge is mixed with oxygen initially but no new “food” (sewage) is introduced.