It is used most frequently with other waste treatment processes. An oxidation pond is basically the same as a sewage lagoon. Primary Treatment removes the material that floats or will settle in sewage. It is accomplished by using screens to catch the floating objects and tanks for the heavy matter to settle in. Pollution results when animal, vegetable, mineral or heat waste or discharges reach water, making it less desirable for domestic, recreation, industry, or wildlife uses.
Polyelectrolytes are synthetic chemicals used to speed the removal of solids from sewage.
The chemicals cause the solids to flocculate or clump together more rapidly than chemicals like alum or lime. Receiving Waters are rivers, lakes, oceans, or other water courses that receive treated or untreated waste waters. Salts are the minerals that water picks up as it passes through the air, over and under the ground, and through household and industrial uses. Sand Filters remove some suspended solids from sewage. Air and bacteria decompose additional wastes filtering through the sand.