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Black Diamond, Inc. Message Board

tex7779 2 posts  |  Last Activity: Jun 1, 2014 5:05 PM Member since: Apr 9, 2001
  • Reply to

    Chromium-6

    by ana_kin_skywalker May 9, 2014 3:46 PM
    tex7779 tex7779 Jun 1, 2014 5:05 PM Flag

    Skywalker:

    You wrote - Cadiz proposes to produce 50,000 a-f per year. That's about 16,000,000 gallons per year or 30 gallons per minute.

    You ought to check your math. 50,000 acre-feet per year is about 16 Billion gallons per year vs. the 16 million that you posted. Therefore, the flow rate is 31,000 gal/min.

    So, using your Glendale example of $ 1.7 million per 100 gpm, will mean a cost of $ 1.7 million times 310 or $ 527 million. Let us assume that there are tremendous economy of scale opportunities of 50%, then you are still looking at a capital cost of at least $ 260 million - just to remove the chrome - 6.

    FWIW, I don't see the chrome - 6 issue as a deal killer. Cadiz will have to remove / reduce the chrome - 6 concentration, period. It is only a question of money.

  • Reply to

    Chromium-6

    by ana_kin_skywalker May 9, 2014 3:46 PM
    tex7779 tex7779 May 31, 2014 6:08 PM Flag

    Now, that the MCL for hexavalent chromium is set at 10 ppb, let us look what those numbers mean.

    The Cadiz water project is supposed to deliver 50,000 acre feet of water per year.

    At 1233.4818 cubic meter per acre - foot, then the Cadiz water project will deliver 61.674 Billion liters each year.

    Given the MCL for chrome-6, it looks like Cadiz will be in excess of that limit by 5 ppb. Multiplying that out times the total flow, yields a total chrome-6 in excess of the allowable of 308,370 grams per year, which is about 679 pounds per year.

    But the total throughput is 14 - 16 ppb, which means that the MWD will have to accept the addition of about 2,000 pounds each year of a highly carcinogenic compound in the drinking water.

    Doubtful that MWD will accept that.

    For that matter, the 5 or 6 organizations, who had their lawsuits recently dismissed, will now have totally new ammunition in their legal pursuits.

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