CHAPTER VII
CONCLUSION
7.1 Conclusions
Based on the results presented above, the most effective way to remove TOC from
milk solution is using Overnite Toilet Care Granules and Baker’s yeast. But Baker’s yeast
is more preferred than Overnite Toilet Care Granules, because Overnite Toilet Care
Granules greatly increases initial content of TOC. The best result, 59.17% of TOC removal,
happened at 6 hours when concentration of TOC was 25 mg/l.
Baker’s yeast is also very effective method to remove TOC from soybean milk, but
G1 is the best bioproduct for TOC removal. 75.2% of TOC was removed by using G1.
Although the removal rate of using beer’s yeast is almost the same as using Baker’s yeast,
beer’s yeast did not show steady results.
Beer’s yeast does not yield good results for most of samples due to high nutrients
content and low concentration of bacteria. Liquid Drain Care is not suitable for treating
either milk or soybean milk wastewater.
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7.2 Engineering Significance
As mentioned above that dairy wastewater contains high concentration of
biodegradable TOC. Dairy wastewater needs to be treated before discharging into
municipal sewer network. This study confirmed that milk and soy milk wastewater contain
high concentration of total organic carbon. Biological treatment can be a very effective and
environmental friendly method to reduce TOC. This study provided a strong possibility of
using Baker's yeast to treat both milk wastewater and soy milk wastewater.
It is encouraged that dairy processing industries should set up laboratory scale
experiment
to
find
the
most
effective
bioproduct
to
treat
their
specific
wastewater. Economic products should be used to remove TOC.
7.3 Recommendations
1. The bioproducts should be in liquid form or totally dissolved in water. This
ensures that the bioproduct added into the wastewater has the same amount of
microorganism. The substrate in the solid form, like Enforcer Overnite Toilet Care
Granular in this study, has to break down cellulose into individual cellulose fibers, then
hydrolyzes cellulose fibers into smaller sugars, and finally break them into glucose.
This leads to the temporarily increase of TOC in wastewater.
2. The bioproduct should not produce bubbles. The bubbles greatly affect the results
of TOC analysis.
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