In this paper the ability of Cassia fistula seed gum in color removing reactive red 195 solution has been tested by Jar-test experiment. The influence of several parameters such as pH, agitation speed, reaction time, gum dosage or initial dye concentration (IDC) have been tested. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 18, SOÁ M1 - 2015 Decolorization of Reactive Red 195 solution by Cassia fistula seed gum Ha Bui Manh Huong Duong Thi Giang Sai Gon University Thach Le Ngoc University of Science, VNU-HCM (Received 20 April 2015, accepted 6 May 2015) ABSTRACT In this paper the ability of Cassia fistula seed gum in color removing reactive red 195 solution has been tested by Jar-test experiment. The influence of several parameters such as pH, agitation speed, reaction time, gum dosage or initial dye concentration (IDC) have been tested. pH results to be an interesting variable and dye removal increases as pH increases to 10. This effect is optimum ( %) at gum Keywords: Decolorization, coagulation, Red 195. dosage 200 mg/L, agitation speed and reaction time seems not to be so affecting parameter, while IDC appears to be a very important variable in color removal capacity, which is higher as IDC decreases (obtained highest decolorization at IDC 10 mg/L). This result indicates Cassia fistula seed gum can be used as an “green” coagulant for color removal from reactive dyeing solution dyeing wastewater, Cassia fistula, Reactive INTRODUCTION Textile wastewater is characterized by a high color, suspended solids (SS), and salinity. Also, it contains a large amount of bioresistant organic contaminants, which have strong toxic impacts on microbes [1, 2]. Many processes for color removal include ozonation, electrocoagulation, adsorption, membrane, sonolysis, etc.[3-5] are being researched. However, these processes are expensive or difficulties in operation. Hence, they could not be employed to treat real dyeing wastewater. The use of coagulation for the treatment of textile wastewater is one of the most common processes which is effective, quick and compact but this process generally cost and product large amounts of toxic sludge that may link to Alzheimer's disease in human as metal-based coagulants (aluminum or iron salts) used [6]. This has
