A First Report on the Selective Precipitation of Sodium Chloride from the Evaporated Residue of Reverse Osmosis Reject Salt Generated from the Leather Industry

2012 ◽  
Vol 51 (15) ◽  
pp. 5527-5534 ◽  
Author(s):  
R. Boopathy ◽  
A. Gnanamani ◽  
A. B. Mandal ◽  
G. Sekaran
Keyword(s):  
Sodium Chloride ◽  
Reverse Osmosis ◽  
Leather Industry ◽  
Selective Precipitation ◽  
First Report

Electrochemical treatment of evaporated residue of reverse osmosis concentrate generated from the leather industry

RSC Advances ◽  
2014 ◽  
Vol 4 (97) ◽  
pp. 54614-54624
Author(s):  
R. Boopathy ◽  
A. B. Mandal ◽  
G. Sekaran
Keyword(s):  
Sodium Chloride ◽  
Reverse Osmosis ◽  
Organic Pollutants ◽  
Calcium Sulphate ◽  
Electrochemical Treatment ◽  
Leather Industry

Proposed scheme for the separation of sodium chloride, calcium sulphate and removal of organic pollutants from ER.

Further treatment of ion exchange brine with dynamic vapour recompression

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
E. Vaudevire ◽  
E. Koreman ◽  
G. Galjaard ◽  
R. Trommel ◽  
M. Visser
Keyword(s):  
Sodium Chloride ◽  
Ion Exchange ◽  
Exchange Process ◽  
Nitrate Removal ◽  
Pilot Scale ◽  
Selective Precipitation ◽  
Ion Separation ◽  
Ion Exchange Process ◽  
Pre Treatment ◽  
Controlled Precipitation

In the context of the development of the SIX© Ion exchange process, the Dutch water company (PWN) decided to investigate options for treatment of the brine arising from the regeneration of the resin. Main goals for the brine treatment are volume reduction and product recovery (water + NaCl). In this regard a biological denitrification (DNF) aiming at total nitrate removal followed by a nanofiltration (NF) aiming at ion separation (monovalent/bivalent) focused on NaCl re-use were implemented on a pilot scale recovering 80% of the total SIX brine (implying 80%recovery of NaCl). Further NF concentrate minimization and Sodium Chloride reclamation would allow a reduction of the disposal fees and chemical uses and therefore largely increase the overall process sustainability. During operation on a pilot scale with a capacity of 250l/h, the Dynamic Vapour Recompression (DVR) technology has proved itself to be capable to reduce the raw regenerate another 6 to 10 times reaching meanwhile the solubility limits of NaCl and other salts making their recovery on a solid stream possible. The condensate that resides after DVR treatment is low contaminated and is therefore suitable for re-injection upstream the SIX pre-treatment process. Laboratory scale evaporation tests showed that salts would precipitate according to the following order: BaSO4 >BaCO3 > MgSO4 > MgCO3 >CaCO3 > CaSO4 > Na2CO3 > Na2SO4 and NaCl. A sequenced thickening by DVR treatment leads to selective precipitation of BaSO4, BaCO3, MgCO3, CaCO3 and CaSO4 at concentration factor around 8 but beyond a CF of 10 it leads to a more or less simultaneous precipitation of NaCl, Na2CO3 and Na2SO4 without fouling/clogging problems of the DVR. A reuse of a heterogeneous (co)precipitate solid fraction is difficult; however this problem could be countered by further investigation on a temperature controlled precipitation of Na2CO3 and Na2SO4. Cooling down the DVR brine saturated in dissolved sodium chloride, sulphate and bicarbonate to a temperature of 5 °C increases solubility differences between sodium chloride and its two contaminants, making their separation possible.

Removal of chromium ions from a real wastewater of leather industry using electrocoagulation and reverse osmosis processes

2020 ◽  
Author(s):  
Rasha H. Salman ◽  
Hassanain A. Hassan ◽  
Khalid M. Abed ◽  
Ahmed Faiq Al-Alawy ◽  
Dhulfiqar A. Tuama ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Leather Industry ◽  
Chromium Ions ◽  
Real Wastewater

Characterisation and recovery of sodium chloride from salt-laden solid waste generated from leather industry

2012 ◽  
Vol 15 (1) ◽  
pp. 117-124 ◽  
Author(s):  
R. Boopathy ◽  
S. Karthikeyan ◽  
A. B. Mandal ◽  
G. Sekaran
Keyword(s):  
Sodium Chloride ◽  
Solid Waste ◽  
Leather Industry
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