Behavior of Water and the Index Substances of Water Quality in a Reservoir with the Dicho-Thermal Stratification.

Matsumoto, Haruhiko; Shirota, Hisatake; Hadano, Kesayoshi; Saitō, Takashi

doi:10.2965/jswe.16.696

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…a) Experimental method and conditions Fig.6 shows a schematic view of the experimental apparatus. The main part of the experimental apparatus consists of the h-type gas dissolving device [1], reservoir tank to hold the water to be treated [2], pump to lift the water to be treated [7], container to keep water to be treated at a constant water level [3], container to receive the water after treatment [4], another container [5] to receive the water flowing over from container [4], diffuser for aeration [9], and air blower to supply air to the diffuser [11]. The water levels of container [3] and container [4] were fixed for the sake of flow rate control.…”

Section: (1) Verification Of the Equivalent δDomentioning

confidence: 99%

“…was reserved in the water tank [2], then mixed using a mixer [13] while keeping the water temperature at about 12[°C]. 2.…”

Section: Tap Water Of 200[l]mentioning

confidence: 99%

“…2. In order to lower the DO concentration of the water, sodium sulfite of 12~15[g] and a small quantity of cobalt(II) chloride hexahydrate as a catalyst were thrown into the water in the tank [2] while mixing continued; then mixing was stopped when the DO concentration began to increase from its minimum value due to the oxygen dissolution at the water's surface. 3.…”

Section: Tap Water Of 200[l]mentioning

confidence: 99%

“…3. In the condition that the water was being lifted by pump [7] from the tank [2] to container [3], and that the water steadily flowed over from the container [3] into the tray [6], the diffuser [9] began aeration in order to operate the h-shaped gas dissolving device [1]. 4.…”

Section: Tap Water Of 200[l]mentioning

confidence: 99%

“…When we evaluate the rate of oxygen transfer into water, the following three conditions are generally imposed 22) : [1]Water temperature should be set at 20 [°C]. [2]The water should be free of dissolved materials such as salts. [3]The water should be in the condition of having the maximum driving force for dissolving oxygen, i.e., the dissolved oxygen concentration, DO concentration, of the water to be treated should be 0[mg/L].…”

Section: Introductionmentioning

confidence: 99%

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An Attempt to Measure the Oxygen Transfer Rate of a Gas Dissolving Device in a Separate-Type Experiment

Ohgi

Hadano

Ma³

et al. 2013

Journal of JSCE

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The ability of a gas dissolving device to improve the DO condition of water is evaluated using the oxygen transfer rate. Usually the oxygen transfer rate is measured in mixing-type treatment, where air bubbles are released in the water tank. This method, however, has some disadvantages, such as that it cannot be used for compressed-type gas dissolving devices and that it requires the evaluation of the overall gas transfer coefficient. The present study proposes a convenient method of evaluating the oxygen transfer rate which is applicable to gas dissolving devices of both compressed and pressure-free types, applicable to water with an arbitrary DO concentration, and does not require the evaluation of the overall gas transfer coefficient. Evaluation of DO improvement is done using the equivalent DO increment, devised to eliminate the influence of the DO concentration of the water before treatment. The value of the oxygen transfer rate is represented as the value at a temperature of 20 degrees Celsius. Laboratory experiments to check the method have shown that the proposed method of measurement is valid.

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