Oxidation ditch process using curved blade rotor as aerator

Thakre, Shashank B.; Bhuyar, Lalit B.; Deshmukh, Samir J.

doi:10.1007/bf03326065

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…The diffusion coefficient represents the molecules transport in solute and diffusion through the solid or liquid phase Liu et al, 2004;2007;Okoye et al, 2010).The adsorption coefficient represents the adsorption interactions between the solute and the solid phase (Barone et al, 1989;Mohammed et al, 2008). However, some studies proved that advection, dispersion, precipitation, hydrolysis, oxidation and decay (Sudheer et al, 2008;Thakre et al, 2009;Dilip et al, 2011) processes controlled the transport of contaminants through porous soil medium.…”

Section: Introductionmentioning

confidence: 99%

A study on contaminant migration of sugarcane effluent through porous soil medium

Sivakumar

2011

Int. J. Environ. Sci. Technol.

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ABSTRACT:A significantly large volume of effluent is generated during the manufacture of sugar and contains high amount of pollution load. The effluent from sugarcane industry is disposed off on land moves into the wider environment through a number of routes and the soil itself retains the various contaminants in the effluent to a greater or lesser extent depending on the physical nature of the soil. The analysis of contaminant transport through soil used to design of industrial wastewater treatments and disposal systems. This paper discussed the adsorption and diffusion of cations calcium, magnesium, sodium and anions chloride and sulphate by the sorption diffusion permeameter under different hydraulic retentions time of 3 min, 13 min, 27 min and 58 min with a constant diffusion flow rate of 3.6 L/h. In this study, less percentage error found between observed adsorption and diffusion coefficients from the experiments at different hydraulic retentions time and optimum adsorption and diffusion coefficients from the experiments at optimum hydraulic retentions time of 30 min for calcium, magnesium, sodium, choloride and sulphate. The results of regression analysis implied that the adsorption and diffusion coefficients obtained from the equation for cations and anions were good recognizing with the experimental results.

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Section: Introductionmentioning

confidence: 99%

A study on contaminant migration of sugarcane effluent through porous soil medium

Sivakumar

2011

Int. J. Environ. Sci. Technol.

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“…Thakre et al (2008) assessed the effects of immersion depth on the oxygenation capacity and power consumption of paddle wheel aerators and K L a (min -1 ) found that increasing immersion depth allowed for a marginal increase in oxygenation capacity and a dramatic rise in power consumption. Thakre et al (2009) tested the effects of immersion depth on the oxygenation capacity of curved blade aerators and found that as immersion depth was increased from 4.8-7.2 cm (50% increase), the oxygen transfer coefficient (K L a) rose from 8.41-10.93 h -1 (30% increase) and the power consumption almost doubled (from 69.9 W to 136 W). Pasveer (1953) investigated the effect of immersion depth of a 42 cm diameter brush aerator on the oxygenation capacity and found that when the immersion depth was increased from 5 cm to 14 cm (180% increase), the oxygenation capacity rose from 147 g/hr m 3 to 391 g/hr m 3 (166% increase).…”

Section: Discussionmentioning

confidence: 99%

Factors Affecting the Oxygenation Capacity of Disc Aerators in an Oxidation Ditch System

Ghaly¹,

Edwards²

2011

American Journal of Environmental Sciences

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Problem statement:The use of aerobic biological methods for the treatment of livestock wastes has resulted in a proliferation of mechanical aeration devices to accomplish the desired treatment. The oxidation ditch system with disc aerators is among the aerobic systems that have been used to treat livestock waste. The main objectives of this study were to investigate the effects of various disc design parameters and system operational parameters on the oxygen transfer coefficient and to study the physical phenomenon of oxygen transfer using high speed movie techniques. Approach: A bench-scale oxidation ditch with a disc aerator was used to conduct a series of experiments to determine the effects of immersion depth (2.5-7.5 cm), disc speed (50-250 rpm), disc thickness (0.32-2.55 cm), hole diameter (0.00-1.92 cm) and number of rotating discs (1-2) on the oxygen transfer coefficient. The unsteady state method with sodium sulfite oxidation was used to deoxygenate the water and the dissolved oxygen concentration was measured with time. Results: The disc speed had the most significant effect on K L a with the immersion depth and hole diameter both showing strong effects and the disc thickness showing less effect. The effect of adding a second disc was comparable to using a single disc of double the thickness at lower speeds while at speeds higher than 200 rpm doubling the thickness of a single disc had less effect than a second disc. Conclusion:The highest oxygen transfer (1.526 min -1 ) was achieved using two coaxial discs with a disc speed of 250 rpm, a disc thickness of 0.64 cm, a hole diameter of 1.92 cm and an immersion depth of 7.5 cm. Bubble aeration and eddy aeration were the most prevalent mechanisms of oxygen transfer in the oxidation ditch while surface aeration played a relatively small role in oxygen transfer.

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“…The wet depth represents the height of the rotator beneath the water level. Usually, ω and h are continuously varied in operation [23]. In an actual reactor, the ascending ω or h of rotators will increase the fluidic velocity to a maximum until the equipment capacity reaches its limits, as qualitatively shown by the convex curve in Figure 2a.…”

Section: Energy Consumption Model Of a Single Surface Aeratormentioning

confidence: 99%

Optimal Surface Aeration Control in Full-Scale Oxidation Ditches through Energy Consumption Analysis

Qiu

Zhang

et al. 2018

Water

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Abstract:Oxidation ditches are popularly used in rural areas and decentralized treatment facilities where energy deficiency is of concern. Aeration control technologies are well established for diffusion systems in order to improve energy efficiency, but there are still challenges in their application in oxidation ditches because surface aerators have unique characteristics with respect to oxygen transfer and energy consumption. In this paper, an integral energy model was proposed to include the energy, aeration, and fluidic effects of surface aerators, by which the energy for aeration of each aerator can be estimated using online data. Two types of rotating disks with different diameters (1800 mm and 1400 mm) were monitored in situ to estimate the model parameters. Furthermore, a feedforward-feedback loop control strategy was proposed using the concept of energy analysis and optimization. The simplified control system was implemented in a full-scale Orbal oxidation ditch, achieving an approximately 10% saving in full-process energy consumption. The cost-benefit analysis and carbon emission assessment confirmed the economic feasibility and environmental contribution of the control system. The energy model can help process designers and operators to better understand and optimally control the aeration process in oxidation ditches.

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Oxidation ditch process using curved blade rotor as aerator

Cited by 16 publications

References 16 publications

A study on contaminant migration of sugarcane effluent through porous soil medium

A study on contaminant migration of sugarcane effluent through porous soil medium

Factors Affecting the Oxygenation Capacity of Disc Aerators in an Oxidation Ditch System

Optimal Surface Aeration Control in Full-Scale Oxidation Ditches through Energy Consumption Analysis

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