TY - JOUR
T1 - Coagulation-flocculation pretreatment of high-load chemical-pharmaceutical industry wastewater
T2 - Proceedings of the 1996 2nd IAWQ International Conference on Pretreatment of Industrial Wastewaters
AU - Torres, Luis G.
AU - Jaimes, Jorge
AU - Mijaylova, Petia
AU - Ramírez, Esperanza
AU - Jiménez, Blanca
N1 - Funding Information:
This work was financed by the Instituto Mexicano de Tecnologfa del Agua, Mexico (Grant UI9413). The text revision by Manuel de la Torre is acknowledged with thanks.
PY - 1997
Y1 - 1997
N2 - The selection of a coagulant-flocculant agent which, based on the maximum chemical oxygen demand removal, warrants the best performance of the removal system for a very complex high-load chemical-pharmaceutical industry wastewater, is described. A total of 23 coagulants/flocculants was tested, including salts, poly-hidroxyaluminates, synthetic polymers as well as natural gums. In a second stage, some mixing aspects were studied. The effects of the specific impeller, the agitation speed during the coagulation and flocculation stages, and the absence or presence of baffles were evaluated in a six-place agitation system. The conventional impellers were replaced by the following types of propellers: Rushton, marine, A310 (Lightning), three flat blades, 45°inclined six blades, and conventional flat blade propeller. It was demonstrated that the appropriate coagulation-flocculation system is capable of diminishing the GOD, the apparent color and the dissolved solids up to 40.6, 25.6 and 39.4%, respectively. The best results were observed when using BL-5086, guar gum, Niad II-3, Niad II-4 and locus beam gum. The impeller performance was highly dependent on the agitation speed for each fixed system. With respect to the mixing aspects, it was shown that the selection of the right propeller for the coagulation and flocculation stages is crucial in determining the quality of the treated water, as well as the quantity and quality of the residual sludges generated in the process.
AB - The selection of a coagulant-flocculant agent which, based on the maximum chemical oxygen demand removal, warrants the best performance of the removal system for a very complex high-load chemical-pharmaceutical industry wastewater, is described. A total of 23 coagulants/flocculants was tested, including salts, poly-hidroxyaluminates, synthetic polymers as well as natural gums. In a second stage, some mixing aspects were studied. The effects of the specific impeller, the agitation speed during the coagulation and flocculation stages, and the absence or presence of baffles were evaluated in a six-place agitation system. The conventional impellers were replaced by the following types of propellers: Rushton, marine, A310 (Lightning), three flat blades, 45°inclined six blades, and conventional flat blade propeller. It was demonstrated that the appropriate coagulation-flocculation system is capable of diminishing the GOD, the apparent color and the dissolved solids up to 40.6, 25.6 and 39.4%, respectively. The best results were observed when using BL-5086, guar gum, Niad II-3, Niad II-4 and locus beam gum. The impeller performance was highly dependent on the agitation speed for each fixed system. With respect to the mixing aspects, it was shown that the selection of the right propeller for the coagulation and flocculation stages is crucial in determining the quality of the treated water, as well as the quantity and quality of the residual sludges generated in the process.
KW - Coagulation-flocculation
KW - High-load wastewaters
KW - Impellers
KW - Mixing
KW - Pretreatment
UR - http://www.scopus.com/inward/record.url?scp=0030719911&partnerID=8YFLogxK
U2 - 10.1016/S0273-1223(97)00395-8
DO - 10.1016/S0273-1223(97)00395-8
M3 - Artículo de la conferencia
AN - SCOPUS:0030719911
SN - 0273-1223
VL - 36
SP - 255
EP - 262
JO - Water Science and Technology
JF - Water Science and Technology
IS - 2-3
Y2 - 16 October 1996 through 18 October 1996
ER -
