WASTEWATER TREATMENT SYSTEM AND PROCESS INCLUDING IRRADIATION OF PRIMARY SOLIDS

  • US 20110005284A1
  • Filed: 07/08/2010
  • Published: 01/13/2011
  • Est. Priority Date: 07/08/2009
  • Status: Active Grant
First Claim
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1. A method for treating wastewater that contains solids and biological oxygen demand compounds, the process comprising:

  • separating a majority of the solids and biological oxygen demand compounds from the wastewater feed using a primary separation process to provide a solids phase and a water phase including wastewater, the solids phase containing an initial level of pathogens;

    irradiating the solids phase to reduce the level of pathogens;

    mixing the wastewater with adsorbent material in a mixing zone for a time sufficient for adsorption of contaminants from the wastewater onto the adsorbent material;

    separating and removing a major portion of the wastewater from the mixture of wastewater and adsorbent material;

    passing the adsorbent material having contaminants adsorbed thereon and a minor portion of the wastewater to a biological regeneration reactor;

    retaining the adsorbent material and wastewater in suspension in the biological regeneration reactor for a period of time that is sufficient to allow microorganisms in the biological regeneration reactor to biologically act on at least a portion of the adsorbed contaminants;

    discharging biologically treated water effluent from the biological regeneration reactor; and

    recycling regenerated adsorbent material to the mixing zone.

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