Author/Authors :
Nabi Bidhendi، Gh. R. نويسنده , , Torabian، A نويسنده Faculty of Environment, University of Tehran, P. O. Box 14155-6135, Tehran, Iran , , Ehsani، H نويسنده Faculty of Environment, University of Tehran, P. O. Box 14155-6135, Tehran, Iran , , Razmkhah، N نويسنده Faculty of Environment, University of Tehran, P. O. Box 14155-6135, Tehran, Iran , , Abbasi، M نويسنده Faculty of Environment, University of Tehran, P. O. Box 14155-6135, Tehran, Iran ,
Abstract :
Textile industry is the major source of water consumption and wastewater pollution.
There are various treatment techniques to remove textile wastewater pollution. Coagulationflocculation is a widely used process to remove pollution due to suspended particles. In this research,
different coagulants like Alum, Lime, FeCl3, FeSO4 and MgCl2 were applied to select the suitable ones
with optimum removal efficiency of sulfuric dyes. Settling characteristics of flocs formed in the
coagulation process were studied in a laboratory scale settling column unit. Parameters such as
color, COD, TSS, turbidity and settled sludge volume have been evaluated. The optimum coagulant
dose and pH value were determined by comparing the effectiveness of these coagulants.Results
showed other coagulants except lime could eliminate color and COD. In this case, FeSO4 was chosen
as an optimum coagulant for color removal because of the lowest required coagulant dose, minimum
settled sludge volume and maximum de-colorization.
