Characterization and coagulation-flocculation treatability of Mexico City wastewater applying ferric chloride and polymers

Petia Mijaylova Nacheva, Luís Torres Bustillos, Esperanza Ramírez Camperos, Socorro López Armenta, Lina Cardoso Vigueros

Producción científica: Contribución a una revistaArtículo de la conferenciarevisión exhaustiva

27 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)235-247
Número de páginas13
PublicaciónWater Science and Technology
Volumen34
N.º3-4 -4 pt 2
DOI
EstadoPublicada - 1996
Publicado de forma externa
EventoProceedings of the 1996 18th Biennial Conference of the International Association on Water Quality. Part 2 - Singapore, Singapore
Duración: 23 jun. 199628 jun. 1996

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