Experiments and numerical modeling of baffle configuration effects on the performance of sedimentation tanks

Bakhtyar, Roham; FiroozabadiB.,

doi:10.1139/cjce-2012-0176

Cited by 19 publications

(12 citation statements)

References 34 publications

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“…1.2 m from inlet for 8.0 m long tank) and with height 25 -30% of water depth improves efficiency. It is worthy to note that 1.2 m distance from inlet in the study by Razmi et al (2013) [27] is equivalent to 150 mm in our work in terms of baffle spacing from the inlet. This is evident in Table 6 where the distances of baffle from the inlet 100 mm, 200 mm and 150 mm for discharge rates of 48.75 ml/s, 60.34 ml/s and 63.27 ml/s respectively gave an average value of 150 mm baffle distance from the inlet.…”

Section: -Results and Discussionmentioning

confidence: 96%

“…To the best of our knowledge and the literature available to us, no work has compared the efficiencies of horizontal and vertical baffles in sedimentation tank. The only work where we can make slight comparison was the work of Razmi et al (2013) [27], where a baffle half way along its length decreases performance, while a baffle closer to its inlet, s/L = 0.15 (i.e. 1.2 m from inlet for 8.0 m long tank) and with height 25 -30% of water depth improves efficiency.…”

Section: -Results and Discussionmentioning

confidence: 99%

“…Primary data was the main source of data for this study, of course this is an experimental research so that a distorted model of scale ratio 1:8 to that of Razmi et al (2013) [27] was constructed and used for the experiment. After the experiment, data was generated and was analyzed statistically using response surface methodology (RSM).…”

Section: -1-sources Of Datamentioning

confidence: 99%

“…A 1 : 8 scale distorted model sedimentation tank geometrically similar to the one used by Razmi et al (2013) [27] in their research was used in conducting the experiment, with dimensions 1.00 m long, 0.30 m deep and 0.20 m wide. The materials for this study include alum solution, clay soil, distilled water and horizontal and vertical baffle mixers with baffles spaced at 100 mm, 150 mm, 200 mm, 250 mm and 300 mm respectively.…”

Section: -3-samples and Sampling Techniquesmentioning

confidence: 99%

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Efficiencies of Horizontal and Vertical Baffle Mixers

Obianyo

Agunwamba

2019

Emerg Sci J

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Efficiencies of sedimentation tanks with horizontal and vertical baffle mixers were studied, compared, and also to determine the optima values of factors of clarification in the sedimentation tanks. These are the discharge, basin baffle spacing and dosing factors, thereby comprises three factors at five levels for a 5k factorial design model. 2.0 mg/l of clay solution was introduced into the basin at discharge rates of 48.75 ml/s, 55.07 ml/s, 60.34 ml/s, 62.45 ml/s and 63.27 ml/s respectively. Alum solution was introduced as coagulant at the inlet of the basin, samples were collected both from the basin and the outlet and concentrations of flocs were measured. Plots of variation of total outlet and average outlet floc with dosing rates for horizontal and vertical mixers show that vertical mixers are better only at discharge of 48.75 ml/s, but horizontal mixers are better at 55.05 ml/s, 60.34 ml/s, 62.45 ml/s and 63.27 ml/s. Variation of grand total floc with dosing rates is also in favour of horizontal mixers. Plots of outlet floc against dosing rates at 48.75 ml/s discharge show that horizontal mixer spaced at 100 mm is better with maximum sediment/floc of 333 10-4 g at a dosing rate of 0.55 ml/s, at 55.07 ml/s discharge vertical mixer is better with 250 mm spacing giving maximum sediment of 985 10-4 g at a dosing rate of 0.95 ml/s. For 60.34 ml/s discharge, horizontal mixer is better at 250 mm spacing with maximum sediment of 307 10-4 g at 0.75 ml/s dosing rate. In the case of 62.45 ml/s discharge, horizontal mixer at a spacing of 300 mm is better with a maximum deposit of 335 10-4 g at a dosing rate of 0.95 ml/s, and for discharge of 63.27 ml/s, horizontal mixer is better at 150 mm spacing having a maximum sediment of 715 10-4 g for a dosing rate of 0.35 ml/s. Response surface methodology (RSM) presented by Montgomery, 2008 was further used for the analysis of data in this study for more reliable inference because it optimized the responses of these three variables. It was observed that for the vertically placed baffles, the stationary points of response surface for discharge rate, baffle spacing and dosing rate are 80.56762847 ml/s, 100.00000 mm and 0.04965779 ml/s, while for horizontally placed baffles, it was 70.636018 ml/s, 332.864704 mm and 1.402526 ml/s, however, these results indicate that horizontally placed baffle mixers are better than vertically placed baffle mixers.

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Section: -Results and Discussionmentioning

confidence: 96%

Section: -Results and Discussionmentioning

confidence: 99%

Section: -1-sources Of Datamentioning

confidence: 99%

Section: -3-samples and Sampling Techniquesmentioning

confidence: 99%

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Efficiencies of Horizontal and Vertical Baffle Mixers

Obianyo

Agunwamba

2019

Emerg Sci J

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“…This also reduced the volume of sediment washed out by fast inflow. The use of baffles placed at the inlet to dampen and diffuse fast inflows (for the purposes of enhancing sedimentation), was investigated in many studies (Krebs et al, 1995;Tamayol et al, 2010;Razmi et al, 2013). Both numerical and physical modelling have shown positive results.…”

Section: Introductionmentioning

confidence: 99%