 While
in the final settling tank, the alum attracts phosphorus, which attaches
to the alum. This gives weight to the phosphorus allowing these particles to settle
within the water and become sludge. The water is sent on to the screw pumps, and the
sludge is sent on to a separate destination.
|
 At
the final lift station, screw pumps allow the water to head toward its
final treatment station. |
 This last station is ultra violate disinfection that
consists of special ultra violet lights that are used to kill a number of different
organisms. Shown are the controls for this station. The water then flows
into Town Creek. |
 Sludge
from the final settling may be diverted to different directions. When more microorganisms
are needed to "eat the food" in the aeration tanks, some of the sludge
containing them is recalculated from the final settling tank back to the aeration
tank. When organisms are not needed, the sludge is run to the aerobic
digesters. Air is added within the tank that promotes the microorganisms to
feed upon themselves. More settling also occurs, with the sludge then piped across
the treatment facility to an andritz press. The picture is a
portion of this press, which is made up of a one meter wide vinyl style mesh belt and
rollers. The sludge is evened out on the belt and then pressed against a series of
rollers that squeeze the water out, producing a product called "cake sludge". |
 A mixture of lime and fly ash is added to this cake sludge
to raise the pH of it, and the temperature of the product is also adjusted to produce a
product called "N-Viro Soil". |
 "N-Viro
Soil" is high in calcium and micronutrients. Farmers then obtain
the product to use on their fields, which helps adjust the pH within their soil. |
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