“…The removal rate in both tests generated third-order polynomial models as a function of time. Table 1 displays the parameters of the regressions of the polynomials using the quasi-Newton numerical optimization method [ 33 ] for the addition and non-addition of the biosurfactant according to [ 8 , 17 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The maximum amount of mineral oil tailings allowed by the Brazilian Environmental Legislation (CONAMA) is of 20 mg L −1 . The biosurfactant produced by Pseudomonas cepacia CCT 6659 [ 8 , 17 ] was capable of reducing the surface tension of the medium from 65 mN m −1 to 26 mN m −1 to reduce the static Sauter diameters, increasing the efficiency of microbubbles production [ 39 ].…”
Section: Resultsmentioning
confidence: 99%
“…In an IPST, the saturation stages of the water-oil mixture and the onset of floc formation with or without the addition of an auxiliary collector, such as a biosurfactant, are performed simultaneously during the passage of this mixture through the microbubble pump. Air and the effluent to be treated enter the aspiration line of the centrifuge pump, completing pre-saturation within the discharge line of the microbubble generation pump [ 8 ].…”
“…The removal rate in both tests generated third-order polynomial models as a function of time. Table 1 displays the parameters of the regressions of the polynomials using the quasi-Newton numerical optimization method [ 33 ] for the addition and non-addition of the biosurfactant according to [ 8 , 17 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The maximum amount of mineral oil tailings allowed by the Brazilian Environmental Legislation (CONAMA) is of 20 mg L −1 . The biosurfactant produced by Pseudomonas cepacia CCT 6659 [ 8 , 17 ] was capable of reducing the surface tension of the medium from 65 mN m −1 to 26 mN m −1 to reduce the static Sauter diameters, increasing the efficiency of microbubbles production [ 39 ].…”
Section: Resultsmentioning
confidence: 99%
“…In an IPST, the saturation stages of the water-oil mixture and the onset of floc formation with or without the addition of an auxiliary collector, such as a biosurfactant, are performed simultaneously during the passage of this mixture through the microbubble pump. Air and the effluent to be treated enter the aspiration line of the centrifuge pump, completing pre-saturation within the discharge line of the microbubble generation pump [ 8 ].…”
“…Various methods are used to process and remove oil pollution from water [24,[32][33][34][35]. The methods can be categorized as chemical, electrochemical, physical, physiochemical or biological [36][37][38].…”
Water plays an essential role in production and refining processes. Many industries that use petrochemicals also require water, especially for cleaning purposes. The wastewaters released by these processes are often rich in petroleum pollutants, which requires significant treatment prior to disposal. The presence of petroleum contaminants in rivers and oceans is a significant threat to human health, as well as to many animal species. A current challenge for most industries and conventional effluent treatment plants is compliance with accepted disposal standards for oil-polluted wastewater. Of particular importance is the processing of dispersed oil in water, as well as oil in water emulsion. Conventional oil and water separation methods for processing oil in water contamination have several technology gaps in terms of applicability and efficiency. The removal and effective processing of dispersed oil and emulsions from oily wastewater is a costly and significant problem. The objective of this paper is to provide a review of the principles associated with oil in water emulsion separation, with the aim of providing a more definitive understanding of the terminology, processes, and methodologies, which will assist the development of a more efficient, innovative and environmentally friendly process for the separation of oily wastewater.
“…Different techniques have been reported to remove oil contaminants from water, such as filtration, 16,17 reverse osmosis, 18 gravity separation, 19 air flotation, 20 ionic flocculation, 21 adsorption, 22 and gel 23 . Among all these methods, the adsorption process is highlighted due to its efficiency, relatively lower processing cost, and simple design 24 .…”
In this article, a new approach is applied to reuse Artemisia residue (AR) as filler in polyurethane (PU) foam for vegetable oil sorption for discarded cooking oil applications. The pristine PU and PU/X%AR foams (X stands for AR content of 5–20%wt/wt) were characterized by SEM, density, contact angle (CA), thermogravimetric analysis, and Fourier transform infrared spectroscopy. The influence of two experimental factors, such as contact time (30–180 s) and initial vegetable oil concentration (20–200 g/L), was investigated in vegetable oil and vegetable oil/mineral water systems. The AR loading of the foams increased the foams' density and influenced the morphological, physical, thermal, and sorption properties. The PU/20%AR sample presented the highest CA (122.5°) and the best sorption capacity and efficiency in both systems due to the small pores size and higher frequency of pores. Langmuir and Freundlich isotherm models well defined the sorption mechanisms. The Langmuir model represented the best fit of experimental data for PU/20%AR with a maximum adsorption capacity of 16.86 g/g. The PU/20%AR presented reusability of 7 cycles, conserving their hydrophobicity after the process. Therefore, AR is an innovative route as fillers in PU foams for discarded vegetable oil sorption, and the circular economy can benefit from the reuse of discarded vegetable cooking oil.
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