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Biocoagulation of dairy wastewater by Lactobacillus casei TISTR 1500 for protein recovery using micro-aerobic sequencing batch reactor (micro-aerobic SBR)

Paper ID Volume ID Publish Year Pages File Format Full-Text
35547 45095 2009 6 PDF Available
Title
Biocoagulation of dairy wastewater by Lactobacillus casei TISTR 1500 for protein recovery using micro-aerobic sequencing batch reactor (micro-aerobic SBR)
Abstract

This study investigated biocoagulation of dairy process wastewater with a new system of the micro-aerobic sequencing batch reactor (micro-aerobic SBR) at a batch bench scale. Lactobacillus casei TISTR 1500 was inoculated to produce acid coagulants under non-sterile acid conditions. Colloidal proteins were removed by employing a solid–liquid separation step as a pre-treatment. The micro-aerobic SBR process had the efficiencies of organic reduction with 73.6 ± 5.9%, 90.1 ± 1.3%, and 85.7 ± 0.6% of chemical oxygen demand (COD), proteins, and sugars without adding external coagulant, and flocculant, respectively. Sustained acid fermentation was achieved for at least 150 cycles by applying an indigenous fill-react-settle-draw-idle sequence in the micro-aerobic SBR process and the use of different solid retention times at 3, 6, 9, 12 and 15 d, consecutively. The micro-aerobic SBR system was able to support lactic acid bacteria (LAB) growth with long SRT (12 and 15 d), due to at least 3 factors: the large inoculum size employed, relatively high concentration of lactic acid produced, and the change in pH during the restoring stage. Current process offered a possible alternative to the more costly chemical and other biological pre-treatments.

Keywords
Biocoagulation; Dairy wastewater treatment; Micro-aerobic sequencing batch reactor (micro-aerobic SBR); Non-sterile acid fermentation; Lactobacillus casei
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Biocoagulation of dairy wastewater by Lactobacillus casei TISTR 1500 for protein recovery using micro-aerobic sequencing batch reactor (micro-aerobic SBR)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 4, April 2009, Pages 406–411
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