Journal
ENVIRONMENTAL TECHNOLOGY
Volume 36, Issue 20, Pages 2674-2680Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1043353
Keywords
nutrient requirements; industrial waste water treatment; COD removal; sludge yield; membrane fouling
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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Effect of chemical oxygen demand (COD) to nitrogen (COD:N) ratio in feed on the performance of aerobic membrane bioreactor (MBR) for treating a synthetic high-strength industrial waste water containing glucose was studied for over 370 days. The widely recommended nutrients ratio (COD:N:P=100:5:1) is not necessary for aerobic biological industrial waste water treatment. An increased COD:N ratio from 100:5 to 100:2.5 and 100:1.8 had a limited impact on COD removal efficiency and further led to a significant improvement in membrane performance, a reduced sludge yield, and improved effluent quality in terms of residual nutrients. An increased COD:N ratio will benefit the industrial waste water treatment using MBRs by reducing membrane fouling and sludge yield, saving chemical costs, and reducing secondary pollution by nutrients addition. Optimization of nutrients usage should be conducted for specific industrial waste water streams.
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