絮凝DAFdissolvedairfloatation工艺的化学因素与环境科学学报.PDFVIP

22 5 Vol. 22, No. 5 2002 9 ACTA SCIENTIAE CIRCUMSTANTIAE S p. , 2002 :2002 : X1312 :A DAF( dissolved air floatation) 1 2 1 1 王毅力, 李大鹏, 郭瑾珑 , 汤鸿霄 ( 1 , 100085; 2, 100083) : DAF . PAC B , , DAF ; , DAF . , , . , , DAF , 15m , 2 4m . : DAF; B ; ; ; ; Study on the chemical factors and particle characteristics of the floccula tionDAF( dissolved air floatation) process 1 2 1 1 WANG Yili , LI Dap ng , GUO Jinlong , TANG Hongxiao ( 1. SKLEAC, R s arch C nt r for EcoEnvironm ntal Sci nc s, Chin s Acad my of Sci nc s, B ijing 100085; 2. D partm nt of Environm ntal Engin ring, B ijing Univ rsity of A ronautics and Astronautics, B ijing 100083) Abstract: For PAC flocculants of high r basicity, th mor surfac charg s and st r ostructur of th ir compon nts l adto b tt r turbidity r moval of flocculationDAF proc ss. B sid s this, th charact ristics of th flocculat d floc had som ff ct on th turbidity r moval. Th xp rim nt r sults show d that flocs could aggr gat to th xtr m siz , and th n fractur with th incr as of th dosag , flocculation mixing int nsity and r t ntion tim . During DAF pilot runs, too small or too larg flocs w r unfavorabl , m dium and compact flocs could provid mor opportuniti s of collision and mor adh sion sit s for th microbubbl s. Strong r and long r flocculation mixing could b b n ficial to particl r moval. Th bigg r particl , th l ss was in float dwat r. Th r w r almost no particl smor than 15m contain d in float dwat r, but mor particl s of 2 4m than in r s rvoir raw wat r. Keywords: flocculationDAF; basicity; str aming curr nt; floc