Procesos de inclusión/exclusión, subjetividades en educación matemática

Oliveros, Gloria García; Dueñas, Paola Ximena Valero; Amaya, Claudia Salazar; Ortiz, Gabriel Mancera; Bustos, Francisco Javier Camelo; Rey, Julio Hernando Romero

doi:10.2307/j.ctvfc55wr

Cited by 1 publication

(5 citation statements)

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“…In many cases, depending on the wastewater to be treated, a coagulation-flocculation process is used before the flotation tank to ensure better adhesion of the microparticles to the bubbles [44]- [46]. Finally, the sludge removal stage is generally composed of a skimmer system that extracts the waste for further treatment [47] (see Figure 2).…”

Section: Dissolved Air Flotationmentioning

confidence: 99%

Section: Industrial Sectormentioning

confidence: 99%

“…The nuclear industry generates gaseous, liquid, and solid radioactive wastes that require specialized treatment due to their high degree of toxicity and contamination [77], [78]. In one study [46], the treatment of radioactive liquid waste using a mobile DAF system was examined. The results showed high removal levels of 95 % for concentrations of oil waste, SO4 -2 , NO 3-, PO3 3-, Ni, and Cr, as well as removal levels of approximately 94 % for total Co, and 75 % for 60 Co.…”

Section: Industrial Sectormentioning

confidence: 99%

“…Another design parameter of DAF is the air-to-solid ratio (A/S), which is directly related to the required removal efficiency and indicates the mass of air required in the pressurization mechanism per unit mass of particles [46], [83]. This parameter, in turn, is associated with % R and the amount of dissolved oxygen or air injected [22].…”

Section: Operating and Design Parameters Of Dafmentioning

confidence: 99%

“…Other parameters are also involved, such as Hydraulic Loading Capacity (HLC) (5-15 m/h in conventional DAF) [43], temperature, gas holdup [112], Recirculation Rate (% R), air pressure, Surface Loading Rate (SLR) (15-30 m/h in high performance DAF equipment) [88], and Hydraulic Retention Time (HRT) [46], [58], [101]. However, six main design parameters are used in conventional DAF systems (see Table 7).…”

Section: Operating and Design Parameters Of Dafmentioning

confidence: 99%

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Dissolved Air Flotation: A Review from the Perspective of System Parameters and Uses in Wastewater Treatment

Muñoz-Alegría

España

Flórez-Marulanda

2021

TecnoL.

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The current issues of climate change and high freshwater demand worldwide have promoted the implementation of wastewater reclamation technologies. This study aims to review the efficiency of the dissolved air flotation (DAF) technique in a wide variety of applications in the agricultural, industrial, domestic, and municipal sectors, which have high freshwater consumption worldwide. We made a systematic review of the DAF technique in wastewater treatment in 2015-2021. We reviewed six indexed databases and governmental statistical reports; we used the keywords: dissolved air flotation, microbubbles, wastewater treatment, and the main operating and design parameters involved in the effectiveness of the flotation process. Additionally, we conducted a review of the most common synthetic coagulant studies used with DAF, as well as natural coagulants that promise to mitigate current climate change. Finally, we discussed advantages, disadvantages, and potential future studies. DAF to have considerable potential for wastewater treatment, as well as for waste utilization. The generation of large quantities of DAF sludge is a breakthrough for clean energy production, as it allows the use of this waste for biogas production.

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Section: Dissolved Air Flotationmentioning

confidence: 99%