Abstract
A pilot scale system was used to evaluate the performance of a membrane microfiltration system, rated at 0.1 micron, for the recovery of starches and other solids from rice cooker wastewater produced by a rice processing facility. The first series of tests revealed that a crossflow velocity (V) of 5 m/s and a transmembrane pressure (TMP) of 275 kPa were appropriate for filtration. In the next series of tests, a concentration of almost 9% total solids was achieved, and the logarithmic relationship between permeate flux and concentration was described. Permeate flux rates decreased from over 80 L/m2*hour (LMH) for unconcentrated samples to under 20 LMH for the most concentrated samples. The feed flow contained an average of 0.71% total solids and 4395-mg/L biochemical oxygen demand (BOD). The permeate contained under 0.10% total solids and 330 mg/L BOD. A membrane system was sized for the test site based on data from these experiments. A system capable of concentrating 68 L/min of cook water to 5%, 8%, and 10% total solids required a total membrane surface area of 75, 100, and 115 m2, respectively. The reduction in sewage expense was predicted to average $10.48 per hour of operation.
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