Suspended solid, color, COD and oil and grease removal from biodiesel wastewater by coagulation and flocculation processes
Coagulation and flocculation are essential processes in a number of diverse disciplines, including biochemistry, cheese manufacturing, rubber manufacturing, and in water and waste water treatment. Coagulation flocculation is effective for removing high concentration organic pollutants and heavy meta...
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| Main Authors: | , , , , , |
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| Format: | Conference or Workshop Item |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7305/ |
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| Summary: | Coagulation and flocculation are essential processes in a number of
diverse disciplines, including biochemistry, cheese manufacturing, rubber
manufacturing, and in water and waste water treatment. Coagulation flocculation
is effective for removing high concentration organic pollutants
and heavy metals in water and wastewater. However, limited information
exists on the efficiency of this coagulation-flocculation process for biodiesel
wastewater treatment. The biodiesel wastewater is basic (alkaline), with a
high content of oil and grease, and a low content of nitrogen and phosphorus.
As such, biological treatment of the biodiesel wastewater is expected to be
very difficult. For this reason supportive physic-chemical methods are often
used. Although one of the most frequently employed method is coagulation.
Therefore, this study was conducted to investigate the efficiency of coagulation
and flocculation processes for removing suspended solid (SS), color, COD and
oil and grease from biodiesel wastewater. Aluminum sulfate, polyaluminum
chloride, ferric chloride and ferric sulfate as a coagulant in biodiesel wastewater
treatment were studied using a standard jar test apparatus. The result shows
that, at the optimum dose of PAC (300 mg/L), the percentage removal of SS,
color, COD and oil and grease respectively 97%, 95%, 75% and 97% compared
to only 92%, 92%, 53% and 99% at the optimal dose alum (500mg/L), 95%,
93%, 63% and 97% at the optimum dose of ferric chloride (350 mg/L) and
88%, 88%, 54% and 94% at the optimum dose of ferric sulfate (450 mg/L).
The effect of coagulant dosages on suspended solid (SS), color, COD and oil
and grease removal showed similar trend and PAC was found to be superior was
observed at reasonable lower amount of coagulant i.e. 300 mg/L. The results
showed that coagulation-flocculation is effective as a pre-treatment for treating
biodiesel wastewater |
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