Coagulation and flocculation conditions on high turbidity water using dissolved air flotation

ENVR 121

Chang Han Lee, chlee@cup.ac.kr1, Dae Myung An, daman@pusan.ac.kr2, Kab Hwan Ahn, khahn@cup.ac.kr2, Seung Soo Kim, sskim@cup.ac.kr2, and Seok Ho Cho, shcho@cup.ac.kr2. (1) Department of Environmental Engineering, Catholic University of Pusan, 9 Pugok 3-dong, Keumjeong-gu, Busan 609-757, South Korea, (2) Department of Environmental Administration, Catholic University of Pusan, San 9, Bugok 3-dong, Geumjeong-Gu, Busan, South Korea
Dissolved air flotation (DAF) can be used for an effective solid-liquid separation process for water treatment technology. The DAF process takes place in the main parts of coagulation, flocculation and flotation, each with a different mechanism. Coagulation and flocculation are one of the most important steps. They are influenced by raw water characteristics, temperature, pH, coagulant type and dose, rapid mix intensity and duration. This study tried to find optimal coagulation and flocculation conditions on high turbidity water for the dissolved air flotation. The optimum coagulant dosages by batch experiments can be visualized graphically by the contours for the various influent turbidities and coagulant dosages. These conditions were applied to the full-scale process, which can be operated with effluent turbidity as low as 1 NTU for a month.
 

General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Environmental Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007