Liquid hydrolysate of dilute acid-pretreated rice straw was
applied to NTR-729HF, NTR-7250, and ESNA3 (Table 3). The pH
(4.9) of the liquid hydrolysate remained essentially unchanged
after membrane-concentration and was optimal for subsequent
fermentation by S. cerevisiae (Matsuda et al., 2011). A pressure of
1.5 MPa was sufficient to concentrate the sugars through NTR-
7250 and ESNA3; however, 2.0 MPa was required for NTR-729HF.
The permeation rates of the rice straw liquid hydrolysate were
similar (16.6–29.0 kg m–2 h–1) for all three membranes (Table 3).
The liquid hydrolysate was concentrated about twofold (2.07,