Patthanant Natpinit, Mutsuo Kawasaki, and Shigeru Araki

pp. 1685 - 1692

Abstract

The objective of this investigation was to study the possibility and performance of treating food industrial wastewater by Membrane BioReactor (MBR). In addition, the effluent of MBR was treated by
Reverse Osmosis system (RO) to reuse in boiler or cooling tower. The membranes of hollow fiber type were filled in the aerobic tank with aerobe bacteria. The total area of membrane 6 units was 630 m² so the flux of
the operation was 0.25 m/d or 150 m³/d. The spiral wound RO was operated at 100 m³/d of influent and received 72 m³/d of permeate. The sludge volume (MLSS) of MBR was maintained at 8,000-10,000 mg/l.
The average COD and SS of MBR influent were 600 mg/l and 300 mg/l respectively. After treating by MBR, COD and SS of effluent were maintained at less than 100 mg/l and less than 10 mg/l respectively. In the
same way, COD and SS of RO permeate were less than 10 mg/l and less than 5 mg/l respectively