Removal of chromium(VI) and naphthalenesulfonate from textile wastewater by photocatalysis combining ionic exchange membrane processes

2011 ◽  
Vol 80 (3) ◽  
pp. 663-669 ◽  
Author(s):  
Hung-Te Hsu ◽  
Shiao-Shing Chen ◽  
Yu-Shan Chen
Keyword(s):  
Textile Wastewater ◽  
Ionic Exchange ◽  
Membrane Processes ◽  
Chromium Vi ◽  
Exchange Membrane

scholarly journals A Novel Ionic Exchange Membrane Crystallizer to Recover Magnesium Hydroxide from Seawater and Industrial Brines

Membranes ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 303
Author(s):  
Daniele La Corte ◽  
Fabrizio Vassallo ◽  
Andrea Cipollina ◽  
Marian Turek ◽  
Alessandro Tamburini ◽  
...  
Keyword(s):  
Magnesium Hydroxide ◽  
Saline Solution ◽  
Low Cost ◽  
Feed Solution ◽  
Ionic Exchange ◽  
The North ◽  
Novel Technology ◽  
Co Precipitation ◽  
Exchange Membrane ◽  
By Products

A novel technology, the ion exchange membrane crystallizer (CrIEM), that combines reactive and membrane crystallization, was investigated in order to recover high purity magnesium hydroxide from multi-component artificial and natural solutions. In particular, in a CrIEM reactor, the presence of an anion exchange membrane (AEM), which separates two-compartment containing a saline solution and an alkaline solution, allows the passage of hydroxyl ions from the alkaline to the saline solution compartment, where crystallization of magnesium hydroxide occurs, yet avoiding a direct mixing between the solutions feeding the reactor. This enables the use of low-cost reactants (e.g., Ca(OH)2) without the risk of co-precipitation of by-products and contamination of the final crystals. An experimental campaign was carried out treating two types of feed solution, namely: (1) a waste industrial brine from the Bolesław Śmiały coal mine in Łaziska Górne (Poland) and (2) Mediterranean seawater, collected from the North Sicilian coast (Italy). The CrIEM was tested in a feed and bleed modality in order to operate in a continuous mode. The Mg2+ concentration in the feed solutions ranges from 0.7 to 3.2 g/L. Magnesium recovery efficiencies from 89 up to 100% were reached, while magnesium hydroxide purity between 94% and 98.8% was obtained.

Chemically facilitated chromium(VI) transport throughout an anion-exchange membrane

2002 ◽  
Vol 963 (1-2) ◽  
pp. 205-211 ◽  
Author(s):  
Elianna Castillo ◽  
Mercè Granados ◽  
José Luis Cortina
Keyword(s):  
Anion Exchange ◽  
Anion Exchange Membrane ◽  
Chromium Vi ◽  
Exchange Membrane

scholarly journals Sequestered capture and desorption of hexavalent chromium from solution and textile wastewater onto low cost Heinsia crinita seed coat biomass

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Folasegun A. Dawodu ◽  
Benjamin M. Akpan ◽  
Kovo G. Akpomie
Keyword(s):  
Seed Coat ◽  
Contact Time ◽  
Low Cost ◽  
Textile Wastewater ◽  
Ion Concentration ◽  
Point Of Zero Charge ◽  
Chromium Vi ◽  
Biosorption Process ◽  
Operational Variables ◽  
Pseudo Second Order

AbstractDue to the high cost associated with the treatment of effluents containing heavy metals in the environment, the continuous untreated release of effluent containing chromium from textile industries has resulted in several adverse effects to plants, ecological systems and humans. This research therefore focused on the use of a low cost, biodegradable Heinsia crinita seed coat (HCSC) material for the biosorption of chromium(VI) from aqueous and textile contaminated effluent. The biosorbent was characterized for specific surface area, surface morphology, pH point of zero charge and surface functional groups. Operational variables influences such as biosorbent dose, pH, temperature, initial Cr(VI) ion concentration and contact time on biosorption process was tested. The optimum biosorption parameter was obtained at pH 2.0, adsorbent dosage 0.25 g and contact time of 30 min. From sorption analysis, the pseudo-second-order model best described the attenuation kinetics. Concerning biosorption equilibrium, the results suggested that the adsorption isotherm obeyed the Freundlich model. Langmuir maximum monolayer biosorption capacity of 231.7 mg/g was higher than most biosorbents for Cr(VI) ion. The thermodynamic data showed a physical, spontaneous and endothermic biosorption process. HCSC showed high percentage desorption > 90% using 0.1 M HNO3 and was efficient after three cycles of regeneration studies. The results showed HCSC biomass as a suitable candidate for abstraction of Cr(VI) ion from contaminated solution and textile effluent.

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