Food wastewater treatment by chemical coagulation. (Water Quality and Treatment 02:00 PM, Saturday, April 5, 2003 Brewer/Frost Science 138 Dr. Yung-Tse Hung-Presiding).

Lo, Howard H. ; Batchu, Madhavi Latha ; Hung, Yung-Tse 等

4:30

This study is to determine the effectiveness of various coagulants on the removal of organic pollutants from food wastewater. Standard jar test was used in the laboratory experiment. The procedures included one minute for rapid mixing, followed by 30 minutes of slow mixing and one hour settling. Supernatant was taken for determination of turbidity and TOC (total organic carbon) tests. Turbidity was measured by turbidity meter and TOC was determined by TOC analyzer, gated: potato wastewater, sugar wastewater, and combined potato/sugar wastewater. The experimental parameters used in this study including three organic strength of wastewater and types and dosage of coagulant. Three organic strength of food wastewater consisted of 50, 125 and 200 mg/L TOC. The coagulants used included aluminum sulfate, ferric sulfate, and ferric chloride with dosages of 2, 4, 6, 8, and 10 mg/l. The lowest turbidity of treated wastewater was 2, 10, and 25 TU (turbidity unit) with aluminum sulfate, ferric sulfate, and ferric chloride as coagulant. It was found that the low organic strength wastewater had a higher turbidity removal efficiency than the medium and high organic strength wastewater. The highest percentage of TOC removal for aluminum sulfate, ferric sulfate, and ferric chloride were: 89, 88, and 95%, respectively. The results of this study showed that the ferric chloride had the best TOC removal efficiency, and the aluminum sulfate had the highest rate of turbidity removal among the three types of coagulants used in the study. The low organic strength wastewater had a better TOC and turbidity removal efficiencies than the medium and high organic strength wastewater. The general trend indicated that as the organic strength of wastewater increased the removal efficiency of TOC and turbidity decreased.

HOWARD H. LO H.LO@CSUOHIO.EDU, BIOLOGICAL GEOLOGICAL AND ENVIRONMENTAL SCIENCES DEPT, MADHAVI LATHA BATCHU MADHUSMILE@YAHOO.COM, AND YUNG-TSE HUNG Y.HUNG@CSUOHIO.EDU, CIVIL ENGINEERING DEPT, CLEVELAND STATE UNIVERSITY, CLEVELAND OH 44115-2214.