ABSTRACT
Dairy industries discharge larger amounts of wastewater as compared to other food
industries. Wastewater contains high amount of total organic carbon materials and
nutrients, such as fat, protein, and lactose.
Biological treatment is widely used to treat this kind of wastewater due to the
fluctuation of amount and content of dairy wastewater. This study investigated removal of
total organic carbon (TOC) from two types of dairy wastewater—milk and soy milk
wastewater. The bioproducts used in experiments were baker's yeast, beer's yeast, live
liquid microorganism (LLMO), Enforcer Overnite Toilet Care Liquid, and Enforcer
Overnite Toilet Care Granular. The parameters included in this study were shaking time,
concentration of wastewater, types of wastewater and bioproducts.
Overnite Toilet Care Granules and Baker’s yeast were very effective to remove
TOC from milk wastewater. But when Overnite Toilet Care Granules dissolved, more
particles were produced and increased the amount of TOC. So Baker’s yeast was more
suitable to treat milk wastewater than the others. The best result is 57% of TOC removal
and happed at 6 hours when concentration of TOC was 25 mg/l. G1 is the best bioproduct
for TOC removal from soybean milk wastewater. 75.2% of TOC was removed by using G1.
It was more than twice higher than TOC removal by using Baker’s yeast and Overnite
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Liquid Drain Care. 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 and Liquid
Drain Care did not yield good results for treating both milk and wastewater. Because
Beer’s yeast and Liquid Drain Care contained unknown components and low
concentrations of bacteria.
Key Words: Milk Wastewater, Soy Milk wastewater, Baker's yeast, Beer's yeast,
LLMO, Enforcer Overnite Toilet Care Liquid, and Enforcer Overnite Toilet Care Granular
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