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  • 1.  Wastewater composite sampling and BOD get effected

    Posted 10-13-2018 10:32 PM
    Hello everyone
    Scenario of work
    I am making composite sampling with respect to time (2 hr) and proportional to flow
    I prepare 6 bottle for 12 hr sampling and note the flow before each sample collection (1 bottle is one sample of single point)
    Then I mix all the six bottle to a new bottle, quantity sample proportional to flow.
    question regarding this scenario working is that,
    While transferring the sample into new bottle is BOD (biochemical oxygen demand) get effected or not.
    If effected so what we do to minimize the effect.
    Note:
    (During transferring we use measuring cylinder pipette tube and new bottle for composite sample)

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    Syed Alvi M.ASCE
    junior engineer
    Techno Consult International
    Karachi
    923242637117
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  • 2.  RE: Wastewater composite sampling and BOD get effected

    Posted 10-14-2018 01:15 AM
    Edited by Mark Lemus 10-14-2018 01:30 AM

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    Mark Lemus
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    Original Message


  • 3.  RE: Wastewater composite sampling and BOD get effected

    Posted 10-14-2018 11:39 AM
    Hi,

    To be simply put, no changing beakers would not cause the BOD to change. When measuring BOD, once you fill the beaker to the desired concentration of waste water and di water, you then let it saturate with oxygen and incubate for x amount of days. So if you change beakers (usually takes seconds) then the amount of BOD would be so minimal it would not matter for your problem. The reairation and the deoxygenation processes would not affect it maybe slightly on an atomic scale but not enough to care for in  this experiment. The only way I could see some error is if you maybe spilled some when changing beakers?

    Hope that helps

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    Max Huynh S.M.ASCE
    Undergrad Student
    UMASS Amherst
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    Original Message


  • 4.  RE: Wastewater composite sampling and BOD get effected

    Posted 10-15-2018 10:11 AM
    Keep your samples refridgerated/iced to minimize BOD change over the 12 hours.

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    Kevin D. White, Ph.D. P.E.
    Professor and Chair
    University of South Alabama
    Mobile AL
    (251) 460-6174
    kwhite@...
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    Original Message


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