Factors Influencing the Removal of Water Soluble Solids from Soybean Curd Whey by Reverse Osmosis

역삼투법을 이용한 두부순물의 가용성 물질 제거에 관한 연구

  • Published : 1992.08.01

Abstract

The effects of membrane type, temperature and pH on the permeate flux and removal of soluble solids from soybean curd whey by reverse osmosis were studied at recommended pressures for optimum performance of the membranes. The fluxes obtained with HR 95 and HR 98 membranes at 60 bar were not lower than that with CA 930 membrane at 20 bar. Soluble solid content in the permeate increased to 1.5 Brix after 90 min by CA 930 membrane, as opposed to 0 Brix with the HR 95 and HR 98 membranes. Permeate flux was increased by 28.4% as operation temperature increased from $30^{\circ}C$ to $50^{\circ}C$. COD of the whey was rejected up to 80.5%, 99.7% and 99.5% by using the membranes of CA 930, HR 95 and HR 98, respectively. pH adjustment of the whey resulted in decreasing membrane performance. But the rejection rate of COD in permeate with HR 98 membrane was slightly increased to 99.9% when the pH was adjusted to 7.0.

Keywords

reverse osmosis;soybean curd whey;soluble matters;membrane performances