Influence of operating conditions on the removal of metals and sulfate from copper acid mine drainage by nanofiltration

Pino, L.Z.; Vargas, Catalina Retamal; Schwarz, Alex; Bórquez, Rodrigo

doi:10.1016/j.cej.2018.03.070

Cited by 71 publications

(28 citation statements)

References 43 publications

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“…As observed in Figure 4 and Figure 5, the permeate flux did not vary proportionally with the MWCO of the selected membranes, suggesting that other parameters, including hydrophilicity/hydrophobicity, are crucial factors in membrane performance. Hydrophilic membranes hold water better, thus facilitating flux through pores [45]. The highest fluxes with the clarified extract were achieved with the NF 12A membrane (with MWCO of 500 Da), which presented the lowest contact angle value, whereas the lowest permeate fluxes were observed for GH and GE membranes (with MWCO of 2500 and 1000 Da, respectively).…”

Section: Resultsmentioning

confidence: 99%

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

2019

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Polyamide commercial membranes in flat-sheet configuration and with molecular weight cut-off (MWCO) in the range of ultrafiltration (UF) to nanofiltration (NF) were tested for the recovery of phenolic compounds from clarified olive mill solid waste (OMSW) aqueous extracts. The performance of selected membranes was evaluated in terms of productivity (permeate flux) and selectivity towards biologically active compounds (such as phenolic compounds, flavanols, and hydroxycinnamic acids derivatives) and total antioxidant activity (TAA) as a function of transmembrane pressure (TMP). NF membranes produced higher permeate fluxes and a lower fouling index in comparison with UF membranes. Retention of bioactive compounds was also significantly higher for NF membranes than for UF membranes. In particular, membranes with MWCO in the range 150–500 Da showed rejection towards flavanols and hydroxycinnamic acid derivatives of about 100%. On the other hand, the rejection towards TAA and total polyphenols was of about 90% and 72%, respectively. Therefore, NF retentate fractions appear of practical interest for the production of food additives and food supplements due to their high antioxidant activity.

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Section: Resultsmentioning

confidence: 99%

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

2019

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“…Figure 4 a,c showed that the permeate fluxes of the two membranes were gradually decreased with the increase of the concentration of acrylic acid or acetic acid. The decrease in permeate flux was mainly due to the reduction in effective pressure caused by the increase of osmosis pressure [ 14 , 41 ]. There was no discernable difference in the retentions of acrylic acid and acetic acid in both the two membranes ( Figure 4 b,d).…”

Section: Resultsmentioning

confidence: 99%

Study on the Concentration of Acrylic Acid and Acetic Acid by Reverse Osmosis

Liu

Xie

et al. 2020

Membranes

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In the production of acrylic acid, the concentration of acrylic acid solution from the adsorption tower was low, which would lead to significant energy consumption in the distillation process to purify acrylic acid, along with the production of a large amount of wastewater. Reverse osmosis (RO) was proposed to concentrate the acrylic acid aqueous solution taken from a specific tray in the absorption tower. The effects of operating conditions on the permeate flux and acid retention were studied with two commercial RO membranes (SWC5 and SWC6). When the operating pressure was 4 MPa and the temperature was 25 °C, the permeate fluxes of two membranes were about 20 L·m−2·h−1. The acrylic acid and acetic acid retentions were about 80% and 78%, respectively. After being immersed in the acid solutions for several months, the characteristics of the two membranes were tested to evaluate their acid resistance. After six months of exposure to the acid solution containing 2.5% acrylic acid and 2.5% acetic acid, the retentions of acrylic acid and acetic acid were decreased by 5.7% and 4.1% for SWC5 and 4.9% and 2.2% for SWC6, respectively. The changes of membrane surface morphology and chemical composition showed the hydrolysis of some amide bonds.

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“…This property of NF membranes is usually used for water treatment and harmful elements removal. Pino et al [ 51 ] stated that the rejection of elements depended on membrane type and operating conditions and Mullett et al [ 52 ] reported that the pH of feed and membrane electrical charge influenced elements and ion retention during nanofiltration of mine water. The pH of the feed influenced the membrane surface charge, permeate flux and retention of individual compounds.…”

Section: Discussionmentioning

confidence: 99%

Concentration with Nanofiltration of Red Wine Cabernet Sauvignon Produced from Conventionally and Ecologically Grown Grapes: Effect on Volatile Compounds and Chemical Composition

et al. 2021

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Ecological viticulture represent an upward trend in many countries. Unlike conventional viticulture, it avoids the use of chemical fertilizers and other additives, minimizing the impact of chemicals on the environment and human health. The aim of this study was to investigate the influence of nanofiltration (NF) process on volatiles and chemical composition of conventional and ecological Cabernet Sauvignon red wine. The NF process was conducted on laboratory Alfa Laval LabUnit M20 (De Danske Sukkerfabrikker, Nakskov, Denmark) equipped with six NF M20 membranes in a plate module, at two temperature regimes, with and without cooling and four pressures (2.5, 3.5, 4.5 and 5.5 MPa). Different processing parameters significantly influenced the permeate flux which increased when higher pressure was applied. In initial wines and obtained retentates, volatile compounds, chemical composition and elements concentration were determined. The results showed that the higher pressure and retentate cooling was more favourable for total volatiles retention than lower pressure and higher temperature. Individual compound retention depended on its chemical properties, applied processing parameters and wine composition. Nanofiltration process resulted in lower concentrations of ethanol, acetic acid (>50%), 4-ethylphenol and 4-ethylguaiacol (>90%). Different composition of initial feed (conventional and ecological wine) had an important impact on retention of elements.

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Influence of operating conditions on the removal of metals and sulfate from copper acid mine drainage by nanofiltration

Cited by 71 publications

References 43 publications

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

Study on the Concentration of Acrylic Acid and Acetic Acid by Reverse Osmosis

Concentration with Nanofiltration of Red Wine Cabernet Sauvignon Produced from Conventionally and Ecologically Grown Grapes: Effect on Volatile Compounds and Chemical Composition

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