Brewery effluent sludge characterization and dewatering to increase potential water recycling capabilities
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Date
2018Author
Fosso-Kankeu, Elvis
Van der Vyver, Christiaan
Moyakhe, Dumisane
Waanders, Frans
De Klerk, Corli
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In this study various coagulants and flocculants were
tested for optimum removal of COD from brewery wastewater.
The coagulants used were ferric chloride and an organic coagulant
mixture obtained from the brewery company. The flocculants used
were a cationic flocculant (Genesys’ genefloc, polyquaternary
amine), an anionic flocculant (Senfloc 5210), a non-ionic flocculant
(Senfloc 5330) and a cationic acrylamide copolymer in aqueous
dispersion (Brewery flocculant) for comparison. The organic
coagulant mixture in aqueous solution was more effective than the
ferric chloride at the same optimal dosage of 25 ppm. The ferric
chloride and organic coagulant mixture used alone achieved COD
removal efficiencies of 32.7% and 48.5% at a pH of 5.65
respectively while their performances for turbidity removal at pH
5.65 were 63.3% and 91.9% respectively. The best results were
achieved when using the ferric chloride in combination with the
cationic acrylamide copolymer in aqueous dispersion (Brewery
flocculant) at an optimum dosage of 30 ppm and when using the
organic coagulant mixture in aqueous solution in combination
with the cationic acrylamide copolymer in aqueous dispersion
(Brewery flocculant) at an optimum dosage of 10 ppm. When using
ferric chloride in combination with the cationic acrylamide
copolymer in aqueous dispersion (Brewery flocculant) and the
organic coagulant mixture in aqueous solution in combination
with the cationic acrylamide copolymer in aqueous dispersion
(Brewery flocculant), COD removal efficiencies of 79.6% and
78.2% at a pH of 5.85 respectively was achieved, while they
exhibited similar performance for turbidity removal at pH 5.85 of
99.7%. The optimization tests carried out in this study have
allowed to improve the understanding of turbidity and COD
removal mechanisms and achieved lower dosages of coagulants
and flocculants for better treatment, therefore suggesting a more
economical approach. Comparing the achieved results with the
standard disposal values, it can be seen that the results gathered in this study complied to the values of the standard disposal values.
This means that the quality of the treated water in this study
complies with the environmental protection laws and will enable
the brewery to dispose the treated water into the environment and
municipal sewer systems
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http://hdl.handle.net/10394/34197https://www.eares.org/siteadmin/upload/8113EAP1118234.pdf
https://doi.org/10.17758/EARES4.EAP1118234