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    DeKalb, Illinois
  • Thursday 01:28 PM
    30th of March, 2017

    Ph. 1B Improvements Bid Results

    The Phase 1B Improvements bidding process was at 10am Today.

    The bid results can be found at the link below

    Bid Results

    SECTION 00030 ADVERTISEMENT FOR BIDS

    2017 Hollister Avenue Demolition -

    The advertisement for bid can be found at the link below

    Advertisement for Bids

    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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