Removal of oil from produced water by ionic flocculation using saponified babassu coconut oil

Silva, Dennys Correia da; Neto, Alcides de Oliveira Wanderley; Peres, Antônio Eduardo Clark; Neto, Afonso Avelino Dantas; Dantas, Tereza Neuma de Castro

doi:10.1016/j.jmrt.2020.02.075

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…Therefore, in the process of sludge dewatering and pretreatment, the M+/D++ in the system can be regulated to control sludge dehydration. 55 Moreover, metal ions, especially iron ion, which are closely related to flocculation characteristics, are very vital for sludge conditioning. Because EPS is usually negatively charged, the electrostatic interaction between cations and EPS plays a very important role in maintaining the sludge floc structure.…”

Section: Influencing Factors Of Sludge Dewateringmentioning

confidence: 99%

“…In view of the influence of the different type ion concentrations, it was proposed that when the concentration ratio of M+ to D++ is less than 2, sludge dewatering property is at its best. Therefore, in the process of sludge dewatering and pretreatment, the M+/D++ in the system can be regulated to control sludge dehydration . Moreover, metal ions, especially iron ion, which are closely related to flocculation characteristics, are very vital for sludge conditioning.…”

Section: Influencing Factors Of Sludge Dewateringmentioning

confidence: 99%

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Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Municipal sludge is an inevitable byproduct during the treatment of wastewater, which is produced by sewage treatment plants in urban residential areas, and it contains pathogens, heavy metals, and other pollutants. Municipal sludge is suitable for application in energy utilization because of its high organic content and relatively low toxic matter. The high moisture content of municipal sludge brings huge difficulties to its harmless disposal and resource utilization. At present, the main method used for sludge dehydration is mechanical dewatering. However, the mud cake produced by this method still has a water content of up to 80%, which does not meet the current rigorous requirements. Therefore, the development of deep dehydration technology for sludge is imperative. In this paper, the basic properties and structure of sludge were summarized. As a key component of sludge flocs, extracellular polymeric substance (EPS) has received much attention in sludge dewatering conditioning. Meanwhile, the influencing factors of sludge dewatering were also fully elaborated, including sludge types, sewage hardness, surface charge, size distribution, and sludge viscosity. And the main methods of sludge dewatering treatment were comprehensively included, namely, the physical method, chemical method, biological method, and combined conditioning methods. The advantages and disadvantages of each method are mentioned, and their application situations were analyzed. Furthermore, comment was provided on the conditioning mechanism, adaptability, prospects, and limitations of the techniques for improving sludge dewatering. This systematic review related to sludge dewatering can not only provide reference information for the conditioning method but also benefit the exploitation of efficient and ecofriendly sludge dewatering technology.

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Section: Influencing Factors Of Sludge Dewateringmentioning

confidence: 99%

Section: Influencing Factors Of Sludge Dewateringmentioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…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 .…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

Maia

Zanini

Claro

et al. 2021

J of Applied Polymer Sci

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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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“…Surfactants are molecules that can decrease the surface tension in a medium in which they are dissolved (da Silva et al, 2020; Li et al, 2020; Tian et al, 2020). Also, it can be used to give viscosity to a formulation and are an option to obtain NaOCl gels.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Sodium Hypochlorite Gel for Endodontic Use

Pinheiro

Almeida

Silva

et al. 2020

J Surfact & Detergents

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The sodium hypochlorite (NaOCl) strong cytotoxicity and the potential to cause accidents by extrusion are the main concerns about its use as root canal irrigant. NaOCl gel has been proposed to improve safety. This research aimed to develop and characterize a NaOCl gel formulation using a surfactant. Seven gels with 2.5% NaOCl were produced using sodium lauryl ether sulfate (SLES) with concentrations between 2.0% and 5.0%. The gels were characterized by pH, surface tension, wettability, viscosity, Fourier transform infrared spectroscopy (FT-IR), bactericidal potential, and organic tissue dissolution. The gels pH which concentration was between 2.0% and 4.5% did not differ significantly from the 2.5% NaOCl solution. The surfactant reduced surface tension by more than 50% in all the gels, without statistical difference between them. Wettability decreased as SLES percentage in NaOCl formulation increased. The SLES addition provided viscous formulations. FTIR analysis showed intermolecular interactions between the SLES and NaOCl. Only 3.0% and 3.5% gels showed significantly reduced bactericidal activity (15 AE 0.7). All gels presented significantly reduced organic matter dissolution rate compared to the NaOCl solution (>56.33 AE 2.88 min). SLES is a surfactant compatible with NaOCl and promising viscosifying agent.

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Removal of oil from produced water by ionic flocculation using saponified babassu coconut oil

Cited by 13 publications

References 44 publications

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Eco‐friendly foams of castor oil based‐polyurethane with Artemisia residue fillers for discarded vegetable oil sorption

Development and Characterization of Sodium Hypochlorite Gel for Endodontic Use

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