Purification and regeneration of diluted caustic and acidic washing solutions by membrane filtration

Nanofiltration regeneration of contaminated single-phase detergents used in the dairy industry

“…It is difficult to compare the values of permeability obtained in this work with those previously reported by other authors (Räsänen et al, 2002;Gésan-Guiziou et al, 2002); due to the fact that only a few researchers have published results obtained from P erm eate F lux P res s ure real industrial contaminated detergents. Moreover, those authors have only considered discontinuous processes and none of them has used single-phase detergents to perform the tests.…”

“…There are a number of works where different technologies have been described to recover contaminated cleaning solutions from the dairy industry (Jung, 1996), and membrane technologies have been often considered for this purpose (Choe et al, 2005; Dresch et al, 1999Dresch et al, , 2001Henck, 1993;Räsänen et al, 2002;Gésan-Guiziou et al, 2002. Most of the papers concerned the treatment of contaminated NaOH cleaning solutions.…”

Membrane Separation Process in Wastewater Treatment of Food Industry

“…Diluted caustic and acidic washing solutions (showing COD between 8 000 and 10 000 mgO 2 .L -1 ) can be recovered by NF membranes with molecular weight cut off (MWCO) between 150 and 300 Da. Permeate flow rates are moderate (between 7 and 12 Lh -1 m -2 ) at pressures around 0.9 MPa (Räsänen et al, 2002). NF shows robust performance for the recovery of caustic solutions when faced with large variations of solution composition, as it happens at industrial CIPs (Dresch et al, 1999;Gésan-Guiziou et al, 2002).…”

“…There are a number of works describing how to recover contaminated cleaning solutions by membranes (Choe et al, 2005;Fernández et al, 2010;Gésan-Guiziou et al, 2002Merin et al, 2002;Räsänen et al, 2002). Dresch et al (2001) pointed out the NF technology as a promising technique compared to decantation, centrifugation and microfiltration (0.1µm cut-off) for the regeneration of waste NaOH solutions from an industrial CIP system.…”

Regeneration of Lyes for Cleaning-In-Place (CIP) Processes in Dairies: Comparison of Recycled Potash and Soda Solutions Cleaning Properties

“…The effectiveness of CIP coupled with microfiltration (Tragardh and Johansson, 1998), ultrafiltration (Dresch, 1998) and nanofiltration (Räsänen et al, 2002;Gésan-Guiziou et al, 2007;Suárez et al, 2012) operations was demonstrated for both ensuring the recovery of NaOH solutions and reducing the load of industrial solutions discharge. MF was found to retain less surfactants compounds and provide a less expensive technology than UF and NF.…”