During the current fermentation process of producing lysine, large amount of organic waste water containing high-concentration salt were generated with the addition of inorganic acid-base regulators. When directly using conventional electrodialysis method to recover (NH4)2SO4 from lysine ion- exchange waste water, the ion-exchange membranes of electrodialysis were easily contaminated by pollutants in the waste liquid like high-valent ions, proteins, sugars and so on. In the diffusion dialysis method using membrane, there were many advantages such as low energy consumption, easy for operation, no pollution of the environment and so on. To reduce the membrane fouling during electrodialysis process and improve its performance, diffusion dialysis with anion-exchange membrane was adopted to clean lysine ion-exchange waste water, then carried out electrodialysis. The results showed that when the flow rate of diffusion dialysis was 5.6 L/h, among inorganic ions and organics investigated, 90.1% of Mg2+, 94.5% of total organic nitrogen, 80.3% of the protein, 86.0% of the total sugar and 79.3% of chemical oxygen demand (COD) were rejected reasonably and nearly 30% of (NH4)2SO4 were recovered by diffusion dialysis with the dialysis coefficient of 2.24×10?7 cm2/s. Moreover, compared with the process performance of (NH4)2SO4 recovery from lysine ion-exchange waste water by electrodialysis directly, the experiment that cleaned the feed solution by diffusion dialysis firstly and then carried out electrodialysis could increase the membrane flux of SO42? and the average current efficiency by 55.7% and 18.3% respectively, and decrease the operation time and the energy consumption of unite flux by 26.1% and 42.3% respectively. It was proved that cleaning lysine ion-exchange waste water by diffusion dialysis was a feasible method to mitigate ion-exchange membrane fouling and improve the process performance of electrodialysis.
Yun WEI Qian WANG Wei CONG
. The process of salt recovery from lysine ion-exchange waste water by diffusion dialysis-electrodialysis[J]. The Chinese Journal of Process Engineering, 2019
, 19(5)
: 975
-981
.
DOI: 10.12034/j.issn.1009-606X.218182
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