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Transcript of Water Treatment
- Inorganic solids such as sand, gravel, coffee grounds, and eggshells will settle to bottom, then separated
- Organics are kept in suspension Aeration Basin
(Secondary Treatment) - Air is added to culture bacteria that eat dissolved
and suspended waste material in the water Dissolved Air Flow Thickener -Air is dissolved in water under pressure and then released at atmospheric pressure in a flotation tank or basin
-Released air forms tiny bubbles which adhere to the suspended matter
-Suspended matter floats to the surface of the water where it may then be removed by a skimming device Primary Clarifier
(Primary Treatment) -Separates waste from the water by slowing the flow.
-Heavy material settles to the bottom and the light material floats to the top Anaerobic Digester -Solids collected and removed from each thickener are digested by anaerobic bacteria
-Bacteria breaks down organic portion of the solids to usable byproducts
-Methane gas used for heating the solids during the digestion process and nutrient rich biosolids.
-Solids held in the digesters for 15-20 days at 95-98˚F to reduce pathogens Secondary Clarifier Chlorine Contact Chamber Water Reclamation Filters Effluent Discharge Pipe - Water is stilled and the bacteria
from the aeration tanks are allowed to
-Controlled amount of removed bacteria
are pumped back to the aeration tanks -Chlorine added in the form of sodium
-Hypochlorite to disinfect the water. Once the chlorine has been in contact
-With the water for a duration of time, sodium bisulfite is added to neutralize
-Chlorine compounds remaining so the water can be discharged safely -To produce recycled water, treated waste water is taken from the contact chamber to the filters
-Water is filtered through granular media (anthracite coal) to pass through the annular voids straining out remaining solids
-Clarified water collected and analyzed for purity -Drainage line for the disposal of sewage and precipitation water
-This supplies enough
bacteria to feed on