TY - JOUR
T1 - Characterization and coagulation-flocculation treatability of Mexico City wastewater applying ferric chloride and polymers
AU - Nacheva, Petia Mijaylova
AU - Bustillos, Luís Torres
AU - Camperos, Esperanza Ramírez
AU - Armenta, Socorro López
AU - Vigueros, Lina Cardoso
PY - 1996
Y1 - 1996
N2 - Physical, chemical and bacteriological characterization of two principal Mexico City wastewater flows are reported. COD and TSS variations were in the ranges of 290 to 680 mg/l and of 50 to 380 mg/l, respectively. The wastewater was strongly alkaline with marked bacteriological characteristics. High concentrations of chlorides, sulfates, Na, K, Ca, Mg and Si were found. Ascaris counts were between 24 and 84 eggs/l. Zeta Potential was from -20 mV to -40 mV. Conventional bench-scale tests were done to study the treatability of the wastewater by coagulation-flocculation with FeCl3 and polymers. The tests of FeCl3 performance showed that at a dosage of 80 to 100 mg/l, TSS and COD removals of between 60 to 68% can be obtained. Best performing flocculants were the cationic acrylamid copolymers, but good results were obtained with some anionic flocculants, too. The removal rates achieved with 20-30 mg/l of FeCl3 and a series of anionic polymers at doses 0.2 to 1.5 mg/l were 74 to 84% for TSS, 48-55% for COD and up to 77% for turbidity and color. Coliforms were not removed, however helminth eggs could be removed completely with low reagent doses.
AB - Physical, chemical and bacteriological characterization of two principal Mexico City wastewater flows are reported. COD and TSS variations were in the ranges of 290 to 680 mg/l and of 50 to 380 mg/l, respectively. The wastewater was strongly alkaline with marked bacteriological characteristics. High concentrations of chlorides, sulfates, Na, K, Ca, Mg and Si were found. Ascaris counts were between 24 and 84 eggs/l. Zeta Potential was from -20 mV to -40 mV. Conventional bench-scale tests were done to study the treatability of the wastewater by coagulation-flocculation with FeCl3 and polymers. The tests of FeCl3 performance showed that at a dosage of 80 to 100 mg/l, TSS and COD removals of between 60 to 68% can be obtained. Best performing flocculants were the cationic acrylamid copolymers, but good results were obtained with some anionic flocculants, too. The removal rates achieved with 20-30 mg/l of FeCl3 and a series of anionic polymers at doses 0.2 to 1.5 mg/l were 74 to 84% for TSS, 48-55% for COD and up to 77% for turbidity and color. Coliforms were not removed, however helminth eggs could be removed completely with low reagent doses.
KW - Characterization
KW - Coagulation-flocculation
KW - Ferric chloride
KW - Treatment
KW - Wastewater
UR - http://www.scopus.com/inward/record.url?scp=0029805926&partnerID=8YFLogxK
U2 - 10.1016/0273-1223(96)00579-3
DO - 10.1016/0273-1223(96)00579-3
M3 - Artículo de la conferencia
AN - SCOPUS:0029805926
SN - 0273-1223
VL - 34
SP - 235
EP - 247
JO - Water Science and Technology
JF - Water Science and Technology
IS - 3-4 -4 pt 2
T2 - Proceedings of the 1996 18th Biennial Conference of the International Association on Water Quality. Part 2
Y2 - 23 June 1996 through 28 June 1996
ER -