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The feasibility of citric acid as external carbon source for biological phosphorus removal in a sequencing batch biofilm reactor (SBBR)

Paper ID Volume ID Publish Year Pages File Format Full-Text
3062 149 2015 6 PDF Available
Title
The feasibility of citric acid as external carbon source for biological phosphorus removal in a sequencing batch biofilm reactor (SBBR)
Abstract

•SBBR with citric acid as a carbon source was applied for phosphorus removal.•Phosphates release and uptake rates depended on mixing and aeration phases duration.•The highest dephosphatation efficiency was observed for phases ratio of 1:3.•Phosphorus content in dry matter of biofilm reached 4.6%.

The aim of this study was to evaluate the feasibility of citric acid as external carbon source for biological phosphorus removal. Citric acid was the only source of organic carbon and biomass occurred only as a biofilm. The effect of varying the duration of the mixing and aeration phases on the process of dephosphatation and consumption of organic substrate was examined. The operation consisted of filling (0.5 h), mixing (2.75–8.25 h), aeration (2.75–8.25 h) and draw (0.5 h) phases. Total phosphorus and nitrogen influent concentrations were 7.02 mg P L−1 and 2.05 mg N L−1, respectively. Enhanced intracellular accumulation of polyphosphates (poly-P) and their release in reactors with immobilized biomass (SBBR) was stated. The highest rates of phosphates release (0.059 ± 0.004 g P–PO43− m−2 h−1) and phosphates uptake (0.028 ± 0.002 g P–PO43− m−2 h−1) were observed for mixing to aeration phase duration ratio of 1:3. The percentage of phosphorus in dry matter of biofilm reached 4.6%.

Keywords
Fixed-bed bioreactors; Fed-batch culture; Waste-water treatment; Phosphate release and uptake rates; Citric acid; Aeration and mixing phases duration
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The feasibility of citric acid as external carbon source for biological phosphorus removal in a sequencing batch biofilm reactor (SBBR)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 93, 15 January 2015, Pages 102–107
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