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    DeKalb, Illinois
  • Sunday 05:42 PM
    18th of February, 2018
    - or - 815.758.3513

    KWRD Phase 1B Improvements

    The District's $46.35m project is currently under construction.

    Details of the ongoing project can be viewed by clicking below

    Ph 1B Improvements

    Out to Bid

    Holly Street Lateral Rehabilitation Project is currently out to bid.

    View Bid Advertisment Below.

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    Primary Physical Treatment

    The goal of primary treatment is to physically remove the suspended solids from the wastewater. From 40 to 60 percent of the solids are removed from the wastewater stream as sludge and scum during the primary phase of treatment.

    Removal of Suspended Solids

    Sedimentation and Floatation: Clarifiers

    The wastewater is pumped into one of three primary “clarifiers.” These are large round settling tanks. Here the water that has been flowing rapidly is slowed down.

    Organic particles denser than water (sludge) sink to the bottom of the tank in a process called sedimentation. The “setteable solids” are collected and pumped to the digesters for further treatment.

    Particles less dense than water (scum), grease and oil float to the surface in a process called floatation. Rotating arms scrape the surface of the water to collect the scum, which is also sent to the digesters for further treatment.

    Primary Effluent

    The water that is left is called the primary effluent. It flows by gravity to the next step in the process of its purification.

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