The Use and Performance of Nanofiltration Membranes for Agro-Industrial Effluents Purification

Macedo, Antónia; Ochando-Pulido, J.M.; Fragoso, Rita; Duarte, Elizabeth da Costa Neves Fernandes D ́Almeida

doi:10.5772/intechopen.75572

Cited by 7 publications

(9 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the concentration process until a VCF = 2.0, the average permeate fluxes were constant with a value around 58 ± 5 L h −1 m −2 , which indicates that during these essays the fouling phenomena was not relevant, which means that these membranes can be used to concentrate these samples until higher VCF values, [ 59 , 60 ]. Besides, after NF experiments with the samples, the hydraulic permeability of membranes was recovered after cleaning, being about 97% of the initial hydraulic permeability of the new membranes.…”

Section: Resultsmentioning

confidence: 99%

Membrane Technology for Valorization of Mango Peel Extracts

Macedo

Gomes

Ribeiro

et al. 2022

Foods

View full text Add to dashboard Cite

Mango peel is rich in nutritional and functional compounds, such as carbohydrates, dietary fibers, proteins, and phenolic compounds, with high potential to be applied in the food industry. Most of the investigation about recovery of bioactive compounds from fruit bioproducts involves extraction techniques and further separation of target compounds. There is still a lack of information about the potential of membrane processes to recover the nutritive/functional compounds present in aqueous extracts of those bioproducts. This research is addressed to study the performance of ultrafiltration (UF), followed by nanofiltration (NF) of UF permeates, to fractionate the compounds present in aqueous extracts of mango peel. Both UF and NF concentration processes were carried up to a volume concentration factor of 2.0. Membranes with molecular weight cut-offs of 25 kDa and 130 Da were used in the UF and NF steps, respectively. UF and NF concentrates showed antioxidant activity, attributed to the presence of phenolic compounds, with rejections of about 75% and 98.8%, respectively. UF membranes totally rejected the higher molecular weight compounds, and NF membranes almost totally concentrated the fermentable monosaccharides and disaccharides. Therefore, it is envisaged that NF concentrates can be utilized by the food industry or for bioenergy production.

show abstract

Section: Resultsmentioning

confidence: 99%

Membrane Technology for Valorization of Mango Peel Extracts

Macedo

Gomes

Ribeiro

et al. 2022

Foods

View full text Add to dashboard Cite

show abstract

“…Although the removal percentage for the MT membrane is slightly lower than the other membranes, it is still selected for further tests due to the great permeate flux. The selected MT and XT membranes are well-known UF-type membranes, which consume less energy than NF membranes, as they are cost effective and readily available in the market [ 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

A Comparison between Various Polymeric Membranes for Oily Wastewater Treatment via Membrane Distillation Process

et al. 2022

View full text Add to dashboard Cite

Oily wastewater (OW) is detrimental towards the environment and human health. The complex composition of OW needs an advanced treatment, such as membrane technology. Membrane distillation (MD) gives the highest rejection percentage of pollutants in wastewater, as the membrane only allows the vapor to pass its microporous membrane. However, the commercial membranes on the market are less efficient in treating OW, as they are prone to fouling. Thus, the best membrane must be identified to treat OW effectively. This study tested and compared the separation performance of different membranes, comparing the pressure-driven performance between the membrane filtration and MD. In this study, several ultrafiltration (UF) and nanofiltration (NF) membranes (NFS, NFX, XT, MT, GC and FILMTEC) were tested for their performance in treating OW (100 ppm). The XT and MT membranes (UF membrane) with contact angles of 70.4 ± 0.2° and 69.6 ± 0.26°, respectively, showed the best performance with high flux and oil removal rate. The two membranes were then tested for long-term performance for two hours with 5000 ppm oil concentration using membrane pressure-filtration and MD. The XT membrane displayed a better oil removal percentage of >99%. MD demonstrated a better removal percentage; the flux reduction was high, with average flux reduction of 82% compared to the membrane pressure-filtration method, which experienced a lower flux reduction of 25%. The hydrophilic MT and XT membranes have the tendency to overcome fouling in both methods. However, for the MD method, wetting occurred due to the feed penetrating the membrane pores, causing flux reduction. Therefore, it is important to identify the performance and characteristics of the prepared membrane, including the best membrane treatment method. To ensure that the MD membrane has good anti-fouling and anti-wetting properties, a simple and reliable membrane surface modification technique is required to be explored. The modified dual layer membrane with hydrophobic/hydrophilic properties is expected to produce effective separation in MD for future study.

show abstract

“…Nanofiltration is a membrane-based technology used for the treatment of waters, such as desalination of brackish water and seawater. Moreover, it can treat wastewater streams from different applications such as textile, industrial, and pharmaceutical [50]. With a pore size between 1 to 10 nm, small ions and organic substrates can be selectively removed by NF with low consumption of energy [50][51][52].…”

Section: Nanofiltration (Nf)mentioning

confidence: 99%

Treatment Technologies for Cooling Water Blowdown: A Critical Review

et al. 2021

View full text Add to dashboard Cite

Cooling water blowdown (CWBD) generated from different industries and district cooling facilities contains high concentrations of various chemicals (e.g., scale and corrosion inhibitors) and pollutants. These contaminants in CWBD streams deem them unsuitable for discharge into surface water and some wastewater treatment plants. The pollutants present in CWBD, their sources, and the corresponding impacts on the ecosystem are discussed. The international and regional (Gulf states) policies and regulations related to contaminated water discharge standards into water bodies are examined. This paper presents a comprehensive review of the existing and emerging water treatment technologies for the treatment of CWBD. The study presents a comparison between the membrane (membrane distillation (MD), reverse osmosis (RO), nanofiltration (NF), and vibratory shear enhanced membrane process (VSEP)) and nonmembrane-based (electrocoagulation (EC), ballasted sand flocculation (BSF), and electrodialysis (ED)) technologies on the basis of performance, cost, and limitations, along with other factors. Results from the literature revealed that EC and VSEP technologies generate high treatment performance (EC~99.54% reduction in terms of silica ions) compared to other processes (membrane UF with reduction of 65% of colloidal silica). However, the high energy demand of these processes (EC~0.18–3.05 kWh/m3 and VSEP~2.1 kWh/m3) limit their large-scale applications unless connected with renewable sources of energy.

show abstract

The Use and Performance of Nanofiltration Membranes for Agro-Industrial Effluents Purification

Cited by 7 publications

References 52 publications

Membrane Technology for Valorization of Mango Peel Extracts

Membrane Technology for Valorization of Mango Peel Extracts

A Comparison between Various Polymeric Membranes for Oily Wastewater Treatment via Membrane Distillation Process

Treatment Technologies for Cooling Water Blowdown: A Critical Review

Contact Info

Product

Resources

About