Conclusions
In this study, the hybrid MF/chemical precipitation
was developed for the brining wastewater recycle in a
food (Kimchi) industry. The following conclusions could
be drawn:
1. The addition of NaOH into the brining wastewater
generated magnesium hydroxide precipitates which
effectively removed the soluble organics and colloidal
particles, but the recovery of valuable magnesium
inducing the peculiar taste of Kimchi reached more
than 85%.
2. In MF of the effluent from the precipitation tank, the
non-neutralized feed was better than the neutralized
one in both dead-end and crossflow modes in terms
of backwashing interval. This was attributed to the
shift of the larger particles to the small ones due to
the redissolution of magnesium hydroxide precipitates
during neutralization. The dead-end mode was
superior to the crossflow one with respect to flux and
energy consumption.
3. The quality test of the product (Kimchi) prepared with
the recycled brining wastewater confirmed that the
hybrid MF/chemical precipitation system was so successful
that it could add another example to the worldwide
cleaner production cases