Biodiesel wastewater treatment by coagulation process for chemical oxygen demand reduction

Biodiesel wastewater contained residual of alkali catalyst, soap and glycerol which causing in high chemical oxygen demand (COD). The optimum conditions of aluminium sulphate (alum), poly-aluminium chloride (PAC) and laterite soil (silifloc) in the coagulation of biodiesel wastewater for COD reducti...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-01, Vol.646 (1), p.12068
Main Authors: Lee, C M, Lutpi, N A, Wong, Y S, Ong, S A, Malek, M A
Format: Article
Language:English
Subjects:
Acidification
Alum
Aluminum
Aluminum chloride
Aluminum sulfate
Biodiesel fuels
Biofuels
Catalysts
Chemical oxygen demand
Coagulants
Coagulation
Diesel
Dosage
Glycerol
Laterites
pH effects
Polymers
Raw wastewater
Reduction
Silica
Silicon dioxide
Wastewater treatment
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Summary:Biodiesel wastewater contained residual of alkali catalyst, soap and glycerol which causing in high chemical oxygen demand (COD). The optimum conditions of aluminium sulphate (alum), poly-aluminium chloride (PAC) and laterite soil (silifloc) in the coagulation of biodiesel wastewater for COD reduction were explored through a sequence of studies including the effects of pH and dosage of coagulants. Coagulation process were conducted in the fixed conditions of mixing rate, mixing time, settling time and anionic polymer aid as flocculant. Silifloc could treat acidified biodiesel wastewater with 32.35 % at pH 2 and dosage of 4000ppm, the highest among these three coagulants. This was due to the silifloc rich in silica component had a higher rate law at sufficient dosage and had an effective range of at around pH 2. Whereas, PAC had a highest efficiency with 61.58% at pH 6 and dosage of 1100ppm in coagulation of raw biodiesel wastewater due to its solubility and elements of higher ions content. On other hand, alum had a moderate performance in acidified and raw wastewater with 26.42 % at pH 6 and 57.63 % at pH 4, respectively.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/646/1/012068