Valorization of artichoke wastewaters by integrated membrane process

Abstract

13The purpose of this work was to analyse the potentialities of an integrated membrane 14 system for the recovery, purification and concentration of polyphenols from olive mill 15 wastewater (OMW). The proposed system included some well-known membrane 16 operations such as microfiltration (MF) and nanofiltration (NF), as well as others not 17 yet investigated for this specific application, such as osmotic distillation (OD) and 18 vacuum membrane distillation (VMD). 19The OMW was directly submitted to a MF operation without preliminary centrifugation. 20This step allowed to achieve a 91% and 26% reduction of suspended solids and total 21 organic carbon (TOC), respectively. Moreover, 78% of the initial content of 22 polyphenols was recovered in the permeate stream. 23The MF permeate was then submitted to a NF treatment. Almost all polyphenols were 24 recovered in the produced permeate solution, while TOC was reduced from 15 g/L to 25

Valorization of Nixtamalization wastewaters (Nejayote) by integrated membrane process

“…Basically, even when our study followed the basic preparation instruction to carry out a common Nixtamalization process, the physicochemical composition of Nejayote depends of the lime quality, type of grain, grain quality, cooking time, and some other parameters as were reported by Gutiérrez-Uribe et al (2010) and Ruiz-Gutiérrez et al (2010). The content of polyphenols on Nejayote was of about 1190.74 mg mL −1 higher content than reported as the content of low molecular weight polyphenols on other wastewaters as artichoke wastewater of 516.7 mg mL −1 (Conidi et al, 2014) and olive mill wastewaters of 211.80 mg mL −1 (Garcia-Castello et al, 2010). Similar content compared to our study was observed by Cassano et al (2013), 1409 mg mL −1 in terms of total polyphenols in olive mill wastewaters.…”

“…polyphenols are widely used by pharmaceutical, cosmetic and food sectors (Garcia-Castello et al, 2010) due to their properties such as anti-inflamatory, antimicrobic and antioxidant activity as well as inhibition of oxidative damage and the radical elimination (Ranalli et al, 2003;Bisignano et al, 1999;Obied et al, 2005). These compounds are usually synthesized by chemical methods that are responsible of their high price as well as their low yields obtained (Conidi et al, 2014). On the other hand, an integrated membrane process can be used for the fractionation by NF membranes or concentration using Reverse osmosis.…”

“…Until now, the treatment of Nejayote by membrane operations has been no reported and less has no used as via of recovery of components derived from the wastewater. Microfiltration (MF) and ultrafiltration (UF) processes have been successfully employed for the recovery, purification and concentration of bioactive compounds from different wastewaters such as artichoke wastewaters (Conidi et al, 2014), orange press liquor (Conidi et al, 2012), olive mill wastewaters (Cassano et al, 2013) and winery sludge (Galanakis et al, 2013).…”

The Use of Nixtamalization Waste Waters Clarified by Ultrafiltration for Production of a Fraction Rich in Phenolic Compounds

“…Furthermore, the nixtamalization waste waters should be considered a valuable source of high-value-added compounds. Some other types of waste water from the food-processing industry have been considered for recovery of polyphenols: artichoke waste waters Table 3 The final mass balance for total soluble solids (TSS), carbohydrates, polyphenols, total organic carbon (TOC), and calcium content in the clarified nixtamalization waste water processed by means of the ultrafiltration (UF) membrane (does not let 1-kDa compounds through) [25], olive mill waste waters [11], and orange press liquor [8]. As for the retentate, it can be reused in other possible applications because the concentrated retentate is rich in calcium; thus, this retentate can be subjected to another nixtamalization process as an alkaline solution.…”

An environmentally friendly process for the production of extracts rich in phenolic antioxidants from Olea europaea L. and Cynara scolymus L. matrices

“…[14]. A very interesting study about membrane technology and the valorization of artichoke wastewaters (leaves, stems, bracts, and blanching waters) has been recently published [15]. In this work, pressure-driven membrane processes, such as ultrafiltration, nanofiltration, and reverse osmosis, have been successfully employed for the purification and concentration of bioactive compounds.…”