Author/Authors :
Hassani، A. H نويسنده Graduate school of Environment and Energy, science and Research Branch, I. A. University, Tehran, Iran , , Seif، S نويسنده Graduate school of Environment and Energy, science and Research Branch, I. A. University, Tehran, Iran , , Javid، A. H نويسنده Graduate school of Environment and Energy, science and Research Branch, I. A. University, Tehran, Iran , , Borghei، M نويسنده Department of Biochemistry, Sharif University of Technology, Tehran, Iran ,
Abstract :
This study evaluates the effectiveness of adsorption process by Granular Activated
Carbon (GAC) compared with a novel formulation of coagulation - flocculation process for dye
removal from textile wastewater. In this regard, acidic, reactive, disperse and direct red dye are used
to prepare the synthetic dye. Dominant wave length for each dye is determined by spectrophotometeric
method. Using GAC as adsorbent, equilibrium time and adsorption isotherm of each dye are determined
with aid of spectrophotometric method. The results show that GAC can not remove dispersed red
dye. Acidic red, direct red and reactive red of 5 mg/L concentration are removed by GAC up to %90,
%88 and %43 in 30, 60 and 120 min. (equilibrium time) respectively. Dyes of 50 mg/L concentration
are removed up to %93, %30 and %51 in 15, 90 and 150 min. respectively. Adsorption obeys Freundlich
isotherm for acidic red, BET isotherm for direct red and Langmuir isotherm for reactive red. This
investigation presents a novel formulation of coagulation - flocculation for color removal from
textile dye solutions and illustrates its efficiency. Novel formulation of coagulation - flocculation
remove direct red, reactive red and disperse red of 5 mg/L concentration respectively up to %93,
%91.3 and %57.1. Also the mentioned dyes of 50 mg/L are removed respectively up to %90.8, %91.9
and %70.1.
