title: Development of pilot scale nanofiltration system for yeast industry wastewater treatment.
abstract: The treatment of the yeast industry wastewater was investigated by nanofiltration (NF) membrane process on a pilot scale. Two wastewaters were used as feed: (i) dilute wastewater with COD 2000 mg/L and (ii) concentrate wastewater with COD 8000 mg/L. The permeate flux, COD retention, color and electrical conductivity (EC) removal were evaluated in relation to trans-membrane pressure and long-term filtration. A linear growth in permeate flux was found with increasing in trans-membrane pressure for wastewaters. In addition, the COD retention, color and EC removal increased with trans-membrane pressure enhancement. The results obtained from the long-term nanofiltration of dilute wastewater indicated that the permeate flux decreased from 2300 L/day to 1250 L/day and COD retention increased from 86% to 92%. The quality of the permeate in term of COD is lower than the discharge standard in river (200 mg/L). Thus, this process is useful for treatment of wastewaters produced by yeast industry.
authors.affiliation: Faculty of Chemical Engineering, Babol University of Technology, Babol, Iran. ahmadrahimpour@nit.ac.ir.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Rahimpour
authors.forename: Mohsen
authors.initials: M
authors.lastname: Jahanshahi
authors.forename: Majid
authors.initials: M
authors.lastname: Peyravi