ABSTRACT: Activated carbon from coffee dregs for TSS, BOD and
COD removal of tapioca industrial wastewater has been developed. The research
aimed to know the quality of activated carbon from dregs of coffee as
adsorbent, consist of total rendemen, water content, ashes content and iodium
adsorption; to know about the optimum contact time and optimum pH from
activated carbon on reducing BOD, COD and TSS value from tapioca industrial
wastewater and also to know about the decrease percentage of BOD, COD and TSS
value using activated carbon from dregs of coffee. Activated carbon from dregs
of coffee are activated using HCl 0,1 N and carbonization at 350°C in muffle
furnace. Then, activated carbon was contacted with the tapioca industrial
wastewater and used on decreasing BOD, COD and TSS value from tapioca
industrial wastewater with contact time varieties 0, 10, 30, 60, 90 and 120
minutes and at pH varieties of wastewater 4, 5, 6, 7, 8, 9 and 10. The
decreasing of BOD value was measured by Winkler method, decreasing of COD value
measured by iodometric method and decreasing of TSS value measured by
gravimetric method. The result of the research showed that the activated carbon
produced characteristic consist of rendemen 14,55%; water content 3,4%; ashes content
1,88% and iodium adsorption 750,25 mg/g. It is indicated that the activated
carbon that is got from dregs of coffee fulfill the criteria required by SNI
No. 06-3730-1995. The result of research also showed that the activated carbon
from dregs of coffee could be used for reducing the BOD, COD and TSS value in
tapioca industrial wastewater at the optimum contact time of 30 minutes and pH
7. The optimum percentage of activated carbon from dregs of coffee in
decreasing BOD value of tapioca industrial wastewater are 33,51%; COD value
78,96% and TSS value 61,05%.
Keywords: activated carbon, tapioca wastewater, BOD, COD
Penulis: Irmanto dan Suyata
Kode Jurnal: jpkimiadd100046
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