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Treatment of acidic wastewater arising from the refining of vegetable oil by crossflow microfiltration at very low transmembrane pressure ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
36028 45118 2007 7 PDF Available
Title
Treatment of acidic wastewater arising from the refining of vegetable oil by crossflow microfiltration at very low transmembrane pressure ☆
Abstract

The refining process of vegetable oils generates acidic wastewater with the following characteristics: pH (1–1.5), COD (10–30 g O2 L−1), suspended solids (7–12 g L−1) and fats (2–4 g L−1). In order to reduce the effluent load and recover a fraction of the fats without using any additives, a microfiltration (0.2–1.4 μm) process involving ceramic membranes at very low transmembrane pressure values (0.1–1 bar) was assessed. Four batches of acidic wastewater from different manufacturing runs were tested. Trials with a constant volumetric reduction ratio of 30 were carried out for periods of more than 5 h. With a 0.5 μm membrane it was possible to maintain a permeate flux of 100 L h−1 m−2 for 24 h and achieve a 91% reduction in SS, a 96% reduction in fat and a COD reduction of more than 60%. In addition, the retentate thus extracted separated spontaneously into two phases, both of which could be exploited: the upper phase mainly consisting of fats as a by-product and the lower clarified phase which could be mixed into the permeate.

Keywords
Microfiltration; Acidic wastewater; Fat recovery; Uniform transmembrane pressure
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Treatment of acidic wastewater arising from the refining of vegetable oil by crossflow microfiltration at very low transmembrane pressure ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 4, April 2007, Pages 693–699
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us