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Abstract- Water hyacinth leaves can be utilized in the process of adsorbing organic
substances. This study aims to determine the decrease of COD and BOD maximum
levels, the optimum mass of water hyacinth leaves powder that used and the optimum
adsorption time. This research was done by adsorbing the tofu waste using adsorbent
from water hyacinth leaves powder. Adsorption process used the adsorbent mass
variation of 2.8; 3.2; 3,4 and 4 gram, and variation of adsorption time is 15, 30, 45, and
60 minutes. The results of adsorption process are then centrifuged, the residue and
filtrate will be separated. Then calculated the value of BOD and COD from the filtrate.
The decreasing in COD levels in the variation of mass obtained 0; 13.63%; 27.27%;
27.27% and 40.91%, while the decreasing in BOD content was 0; 33.33%; 46.67%;
55.56%; and 73,33%, indicating that the more adsorbent in the tofu waste will decrease
the value of BOD and COD while the decreasing of the level will be bigger. The
optimum mass analysis results obtained 4 grams on the decrease of BOD and COD. The
optimum time of adsorption at COD was 30 minutes while there’s no equilibrium in
BOD.
Keywords: adsorption, biomass, water hyacinth leaves, tofu waste. |
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