The liquid layer that is drawn off the top of the basin after settling. It should be relatively clear and free of solids. AKA decant.

A point in the sewer system where the wastewater needs to be pumped (lifted) to a higher elevation so that gravity can be used to bring the wastewater to the treatment plant. In Hailey there are [..]

A machine placed in the wastestream that collects large pieces of material that may cause damage or blockages downstream such as rocks, rope, etc. Other material (like paper towels) is shredded [..]

The next device in the wastestream. As the wastewater goes around, it slows down and the heavier sand and grit settle in the bottom. Every hour or so, the settled grit is forced by air into a gr [..]

The above 2 devices are considered preliminary treatment. The point of preliminary treatment is to protect the pumps and other equipment in the plant and to reduce down time due to blockages and da [..]

A step in the treatment process where solids are removed through settling or floating. The floating solids (scum) is then taken to a land fill or burned. It increases the efficiency of plants where th [..]

Usually a biological process where bacteria oxidize or breakdown organic matter that is missed by primary treatment. At Woodside, the bacteria take care of all the organic material (no primary). Also [..]

Large (81'x 81'x 21') concrete tank where various steps of secondary treatment occur.

These bacteria require molecular oxygen in order to consume food (organic material and nutrients). If not enough oxygen is present, the treatment process will suffer because the bacteria cannot do the [..]

These bacteria become inactive in the presence of molecular oxygen. They oxidize food by stripping oxygen from other sources such as sulfate and sulfite. If wastewater is without oxygen for long perio [..]