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Apparatus for treatment of waste water
| Details |
Inventors: Benjes, Henry H.; Wahbeh, Valery N.; Stukenberg, John R.;
Assignee: Bacardi Corporation (San Juan, PR)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
An apparatus is provided for treatment of organic contaminant containing waste water such that the oxygen demand of the waste water is reduced and methane is produced. The apparatus comprises an anaerobic digester or filter. The digester is packed with a media which provides a substantial growth surface area to microorganisms contained within the digester. The digester also includes recirculation means whereby fluid in the digester below the media is recirculated directly to an upper portion of the digester. Furthermore, the digester has effluent overflow outlets which outlets include a trap to prevent oxygen from entering the digester from the atmosphere. Fluid to be treated in the digester enters the upper portion thereof, passes downwardly through the media, is recirculated by the recirculating means to an upper portion of the digester, and exits the digester after treatment by the microorganisms therein through the outlets. The recirculating means may be selectively adjusted to vary flow in different portions of the digester. |
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DETAILED DESCRIPTION An apparatus is provided for treatment of waste water containing organic contaminants.
In particular, preferably both the oxygen demand of the waste water is reduced and methane is produced while the waste water is in the apparatus.
The apparatus comprises an anaerobic digester or filter.
The digester is packed normally at least in an intermediate portion thereof with a media which provides a substantial surface area to microorganisms contained within the digester.
The digester also includes recirculation means whereby fluid in a lower portion of the digester, especially below the media, is recirculated directly to an upper portion of the digester, such that microorganism biomass contained in such fluid is transferred to the digester upper portion.
The recirculation means, normally a pump, includes control means for selectively varying or adjusting the flow through the pump so that the recirculation waste water ratio to inlet waste water can be varied.
In addition, where several spaced recirculation means or devices are utilized, the control means may be utilized to modify the amount of fluid withdrawn from one lower portion of the digester as compared to another lower portion.
In this manner flow of waste water down through the digester may be varied in accordance with blockage of the media by microorganism growth or to modify flow rates of waste water through different sectors of the digester wherein microorganism activity varies.
Furthermore, the digester includes effluent overflow outlets, which outlets include a trap to prevent oxygen from entering the digester from the atmosphere and escape of methane from the digester.
Waste water fluid to be treated in the digester enters the upper portion thereof, passes downwardly through the media, is recirculated by the recirculating means to an upper portion of the digester, and exits the digester after treatment by the microorganisms therein through the outlet of the digester.
Preferably, the recirculation rate can be selectively controlled to adjust for digester conditions and to maximize the digesting process
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CPUs 
