Desalination, Vol.131, No.1-3, 47-53, 2000
Water recycling by floating media filtration and nanofiltration at a soft drink factory
A water recycling system, utilizing floating media filtration and nanofiltration (NF) was developed and implemented for the reuse of water at a soft drink factory. This factory, which produces both carbonated and non-carbonated soft drinks, uses abundant fresh water in each of its production processes. As for the treatment of wastewater from the washing of bottle and cans, as well as cooling water from the disinfection process, NF was applied as a means of removing soluble organics. The NF system (treatment capacity: 33 m(3)/h; water recovery of 85%), constituting the main water recovery system at this plant, was found to be economical due to the energy efficient NF supply pump operation, enabled by high water recovery and low operation pressure. This NF system is capable of CODMn removal exceeding 70% and an evaporation residual matter removal of roughly 40%. Employment of membrane filtration for wastewater recovery achieved a recovery of 2050 m(3)/d as compared to 650 m(3)/d prior to its use. The use of tap water has also dropped to less than two-fold, from 3600 m(3)/d to 1650 m(3)/d. This water recycling system not only achieved a savings on tap water cost, but also enabled conservation of water as a resource and a reduction in the amount of discharged wastewater, thus minimizing the impact on the environment.