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Three-step recycling membrane bioreactor for the production and separation of enzymic hydrolyzates of Alaska Pollack skin gelatin. TI, temperature indicator; PI, pressure indicator; FI, flow indicator; P1, recycling pump; P2, feed pump; P3, NaOH pump; PCV, pressure control valve; pHIC, pH indicator controller; FH, first hydrolysates; SH, second hydrolysates; TH, third hydrolyzate (Adapted from Byun and Kim [8]).
