Peculiarities of electrodialysis processing of mineralized human exometabolites

The possibilities of the electrodialysis method in processing solutions of mineralized human exometabolites, where the dialysate is used for watering plants and the concentrate is subjected to further processing to afford common salt, are considered. The effect of the degree of solution purification from organic compounds on the electrodialysis rate is studied. Solutions are purified on carbon sorbent Sibunit which can be repeatedly recovered. The optimal parameters of the sorption stage of purification, namely, solution pH 2–4; contact time 1.5–2 h, specific consumption of sorbent 300 g/L, are determined. It is shown that the preliminary enzymatic degradation (enzymolysis) of urea by urease and, especially, the sorption cleaning of solution considerably accelerate the transmembrane mass transfer, remove complications of this process (precipitation), and favor both the dialysis with the preset degree of desalination with respect to sodium ions (which inhibit the plant growth) and the formation of the organic-free concentrate that can be used in the further extraction of dietary salt.