A modified method for estimation of chemical oxygen demand for samples having high suspended solids

Determination of chemical oxygen demand (COD) of samples having high suspended solids concentration such as cattle dung slurry with open reflux method of APHA–AWWA–WPCF did not give consistent results. This study presents a modification of the open reflux method (APHA–AWWA–WPCF) to make it suitable...

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Bibliographic Details
Published in:Bioresource technology 2006-03, Vol.97 (5), p.721-726
Main Authors: Yadvika, Yadav, Asheesh Kumar, Sreekrishnan, T.R., Satya, Santosh, Kohli, Sangeeta
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animals
Biological and medical sciences
Bioreactors
Cattle
Cattle dung
Chemistry Techniques, Analytical - methods
COD estimation
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Heterogeneous substrates
Manure - analysis
Oxygen - analysis
Slurry
Suspended solids
Use of agricultural and forest wastes. Biomass use, bioconversion
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Summary:Determination of chemical oxygen demand (COD) of samples having high suspended solids concentration such as cattle dung slurry with open reflux method of APHA–AWWA–WPCF did not give consistent results. This study presents a modification of the open reflux method (APHA–AWWA–WPCF) to make it suitable for samples with high percentage of suspended solids. The new method is based on a different technique of sample preparation, modified quantities of reagents and higher reflux time as compared to the existing open reflux method. For samples having solids contents of 14.0 g/l or higher, the modified method was found to give higher value of COD with much higher consistency and accuracy as compared to the existing open reflux method.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2005.04.013