Compared to RO, ED and EDR ZLD systems are able to concentrate feedwaters to higher salinity up to 200 g/l
Slovak leading producer of aluminium, ZSNP headed to the negative impact of its production activities. The feed water for the sludge bed has very high alkalinity (pH 13–14) and contains free NaOH, anions of OH-, CO3 2-, cations of Na+, K+, metals as Al (1 g/l), heavy metals Cr, As, Mo, V and some organic matters.
The typical electrodialysis mode Feed & Bleed has been chosen for this case. Design of membrane process was done with emphasis to reaching the quality of desalinated water (6 g/l) and maximal concentration of brine (180 g/l). The fundamental advantages are in the flexibility of process control allowing to obtain wanted product quality and quantity.
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