Date of Award


Degree Type



Civil and Environmental Engineering

First Advisor

Hung, Yung-Tse

Subject Headings

Milk -- Waste disposal, Organic wastes -- Purification, Hazardous wastes, Yeast, Sewage -- Purification -- Biological treatment, Milk Wastewater, Soy Milk wastewater, Baker's yeast, Beer's yeast, LLMO, Enforcer Overnite Toilet Care Liquid, and Enforcer Overnite Toilet Care Granular


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 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