Nexom

Wastewater Term: Primary Treatment

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Source: Nexom

Definition

Primary treatment separates suspended solids and greases from wastewater, usually following screening or other preliminary treatments in a wastewater plant.  Clarifiers or septic tanks are typical devices used for primary treatment.  In a clarifier, wastewater is held in a quiet tank for several hours allowing the particles to settle to the bottom and the greases to float to the top.  The solids drawn off the bottom and skimmed off the top receive further treatment as sludge.  The clarified wastewater flows on to the next stage of wastewater treatment.  Well-designed primary treatment allows the secondary treatment system to operate more efficiently.

Search For The Best Primary Treatment System

Our new Salsnes line of filters provides superior separation at the start of the plant. The design came about as a result of a goal to find dependable and cost efficient technologies that fulfilled the stringent European Union criteria for primary treatment. The primary treatment requirements are at least 20% removal of organic matter (measured as BOD) and 50% removal of suspended solids (SS). In the end, the Salsnes Filter was the only system to accomplish this feat.

Solution To Major Challenge - Increased Plant Capacity

When a Salsnes system is implemented in an existing wastewater treatment plant, the system removes 60% of the solids in primary treatment. In general, this allows the rest of the plant to handle more wastewater in its various treatment systems, increasing plant capacity.

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