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complete system large enough to accommodate Washington’s current water usage level of 50,000 gallons per day. Placement of the system depends heavily on underlying rock strata and soil qualities.
, Operation begins with a communitor, or grinder pump, that reduces incoming solid wastes to pulp and injects them deep into a lined and sealed pond called a treatment cell. There, contained on the bottom of the pond, anaerobic bacteria function as in a septic tank, digesting the raw sewage for 14-40 days.
Thirty days is usually sufficient to ensure 100 percent disinfection of the water, making chlorine treatment unnecessary.
Organic material is completely broken down into soluable gases and water. Small quantities of inorganic material settle to the bottom of the pond. There is no sludge or “biomass” to be pumped out or otherwise disposed of.
The ponds remain completely odor free because raw sewage is never exposed to the open air. A thick layer of
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