Download e-book for iPad: Measurement of oxygen transfer in clean water : ASCE by Michael Stenstrom (Editor)

By Michael Stenstrom (Editor)

Size of Oxygen in fresh Water, ASCE/SEI 2-06, presents the newest tools for measuring the speed of oxygen move from subtle gasoline and mechanical oxygenation units to water. an entire revision of ANSI/ASCE 2-91, this usual represents the present consensus of the ASCE Committee on Oxygen move criteria. ASCE/SEI 2-06 is acceptable to laboratory scale oxygenation units with water volumes of some gallons in addition to to complete scale platforms with water volumes usual of these present in the activated sludge wastewater therapy procedure. it truly is meant to be used by way of engineers within the practise of necessities for compliance trying out and by way of brands within the improvement of functionality info

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Additional resources for Measurement of oxygen transfer in clean water : ASCE standard, ASCE/EWRI 2-06

Example text

They found excellent correlation between SOTE and TDS using both linear and exponential regression models. However, the exponential method provided a better fit at both ends of the data range. They also used 1,000 mg TDS͞l as the reference concentration. Their relationship is nearly identical to the expression developed by Ewing and Redmon. 0000965 (1,000-TDS)] 24 (Eq. CB-2) The more fundamentally correct adjustment for the TDS effect is to use the mass transfer coefficients as originally proposed by Benedek.

Therefore, calibration of a probe in air is not recommended. 1 Continuous Probe Data When DO probes, equipped with continuous strip chart recorders are used, a continuous record of dissolved oxygen versus time will be available at each determination point. 0 min, thereafter). In this case, a minimum of 21 discrete data values shall be used for the analysis. 3. Commentary D gives guidance for selecting time intervals to meet these criteria. The discrete data values shall be read directly from the recorder graph or digital output and shall not be subject to any smoothing or averaging procedure.

The length of time that the high purity oxygen must be fed into the air stream to achieve target DO saturation concentration is calculated by tO2 ෇ (Ϫ60͞KLaЈ) ln[(C*ϱHPO Ϫ ⌬c Ϫ C*ϱAIR)͞ (C*ϱHPO Ϫ C*ϱAIR)] (Eq. CA-4) ASCE/EWRI 2-06 ⌬C ෇ 15 mg͞L where tO2 ෇ dosing time, min; KLaЈ ෇ apparent volumetric mass transfer coefficient for the air/oxygen mixture, hr Ϫ1. The value of KLaЈ can be estimated by KLaЈ ෇ KLa(QaЈ ϩ QO2)͞Qa (Eq. CA-5) QaЈ ෇ airflow rate (from blowers) during the high purity oxygen dosing time, ft3͞min (m3͞hr).

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