Automation and Control of a Dissolved Air Flotation Pilot Plant

Fonseca, Rodolpho Rodrigues; Thompson, José Pedro; Franco, Ivan Carlos; Silva, Flávio V. da

doi:10.1016/j.ifacol.2017.08.364

Cited by 11 publications

(9 citation statements)

References 10 publications

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“…In the DGF process (Fig. 9), fine gas bubbles are formed due to the pressure reduction in the presaturated aqueous solution when it passes through needle valves or orifices (Fonseca et al 2017). The generated bubbles have a size range of 20-100 μm diameter (Edzwald 2010;Brasileiro et al 2020).…”

Section: Dissolved Gas Flotationmentioning

confidence: 99%

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

et al. 2022

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Gas flotation for oily wastewater treatment is based on the attachment of gas bubbles to oil droplets to produce lighter aggregates that rise to the wastewater surface. It is a feasible, promising, and effective method for oily wastewater treatment due to its high separation efficiency with no secondary contamination, cost-effectiveness, and simple operation. This review focuses on separating oil from emulsions by gas flotation using microbubbles and nanobubbles which offer the advantages of small bubble size, large specific surface area, and slow rising velocity. The properties of different types of gas bubbles and their generation methods were discussed. Different gas flotation system designs and operational parameters were summarized for dissolved gas flotation, induced gas flotation, and electrolytic flotation. The review illustrated that oil removal efficiency in microbubble and nanobubble-based gas flotation was affected by various factors including initial oil concentration, pH, temperature, flotation time, and oil droplet size.

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Section: Dissolved Gas Flotationmentioning

confidence: 99%

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

et al. 2022

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“…This process has also achieved good practical applications in water plants in Jinan city, Zhuhai city and other places [28]. DAF process has a significant effect on the treatment of pollutants such as turbidity, color, odor, permanganate index and algae in the water [29][30]. It was found that the performance of microbubbles and the hydraulic retention time have an important effect on the removal of color in the experiment.…”

Section: Processing Ability Of Daf Unitmentioning

confidence: 99%

Improvement in Sensory Properties of Micro-Polluted Lake Water Using Membrane Reactor Combined Process

Zhao¹,

Xu²,

Ruan³

et al. 2022

Pol. J. Environ. Stud.

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To improve the water quality of micro-polluted lake water, an integrated process of dissolved air flotation (DAF)/modified attapulgite (M-ATP)/membrane filtration was applied to treat micro-polluted lake water with poor sensory attributes. The results showed that the average removal rate for water turbidity, color and odor using this process system were 95.8%, 83.1%, and 90.0% in order. Moreover, the M-ATP unit had the best treatment effect in turbidity and odor removal, with removal rates of 48.7% and 49.8%, respectively. While the DAF unit could remove 46.6% of the color at the same time. Based on the analysis of different processing units, the correlation between the removal rates of different processing units was explored using SPSS software. The results indicated that correlation between the three processing units is negative. In addition, in the three-month operation period, the initial transmembrane pressure (TMP) of the membrane device was about 2.3 kPa, and the final TMP was only about 4.5 kPa. This research provided technical reference for the treatment of micro-polluted lake water.

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“…However, in case of small drains, simple physical and chemical unit operations would be enough for water treatment [4]. Consequently, dissolved air floatation [67][68][69] could also reduce up to 80% of suspended solids and phosphorous, while anammox biocathode could remove up to 90% ammonium [70]. Furthermore, a least-operating-cost electrocoagulation (EC) using aluminum electrodes can remove TDS and BOD up to 70-80% [71].…”

Section: Parametermentioning

confidence: 99%

Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan

Iqbal

Shoaib

Agwanda

et al. 2018

Water

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Abstract:One of the challenging problems of Punjab, the most populous province of Pakistan, is the surface water-quality problem of the Ravi River, which flows through the main cities of the province. At present, the overall status of water quality is very polluted, primarily due to residential and industrial wastewater directly discharged into the Ravi River through a network of drains. Due to the poor quality of the water, the river ecosystem is not favorable for the aquatic and surrounding environment. Hence, management options are proposed to reduce pollution. Therefore, the study was formulated to identify the main sources of pollution along the Ravi River and their potential impact on the course of the river channel. In addition, the study applied a numerical model WASP 8.1 (Water Quality Simulation Program) to discover the best strategy for the improvement of water quality. Through the model simulation it was found that, if the flow at headwater and link canals is increased up to 50%, along with 75% improvement in the pollution concentration of drains through wastewater-treatment facilities, the water quality of the Ravi River can be improved up to an acceptable limit of water-quality standards.

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Automation and Control of a Dissolved Air Flotation Pilot Plant

Cited by 11 publications

References 10 publications

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

Improvement in Sensory Properties of Micro-Polluted Lake Water Using Membrane Reactor Combined Process

Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan

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