TẠP CHÍ KHOA HỌC TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH Tập 18, Số 9 (2021): 1699-1710 HO CHI MINH CITY UNIVERSITY OF EDUCATION JOURNAL OF SCIENCE Vol. 18, No. 9 (2021): 1699-1710 ISSN: 2734-9918 Website: http://journal.hcmue.edu.vn 1699 Research Article * INVESTIGATION OF THE REMOVAL OF REACTIVE BLUE 220 DYE BY GUM EXTRACTED FROM TARAMIND SEEDS Nguyen Thi Ngoc Mai * , Nguyen Thi Ngoc Thao, Duong Thi Giang Huong Department of Environmental Sciences, Saigon University, Vietnam * Corresponding author: Nguyen Thi Ngoc Mai – Email: nguyenthingocmai0309@gmail.com Received: June 10, 2021; Revised: June 25, 2021; Accepted: September 06, 2021 ABSTRACT In this study, gum was successfully extracted from tamarind seeds (gum) and used as a material for the removal of reactive dye (Reactive Blue 220-RB220). The performance of decolorization and COD reduction of gum was investigated using the one-factor-at-a-time method. The factors include pH, mixing time, agitating speed, color concentration, and gum concentration. Under optimal conditions, color and COD removal efficiency of gum was roughly 74.4% and 83.3%, respectively. These results indicate that gum is a “green” and “eco-friendly” coagulant and has great potential for application in textile dyeing wastewater treatment. Keywords: coagulant; gum; Reactive Blue 220; tamarind seeds; textile dyeing wastewater 1. Introduction Currently in Vietnam, the textile industry has an increasingly important role in the national economy to meet the needs of domestic consumption and export. However, the production of the textile industry also bears many negative impacts on the ecological environment, particularly the effects of textile wastewater. Textile wastewater is wastewater generated in different stages such as cooking, bleaching, dyeing, or printing. The main pollutants in textile wastewater are persistent organic substances with functional groups chromophore, surfactant, and compounds of organic halogen(Holkar, Jadhav, Pinjari, Mahamuni, & Pandit, 2016). According to estimates, about 700,000 tons per year of different colors are produced from nearly 100,000 thousand kinds of commercial dyes worldwide (Rafatullah, Sulaiman, Hashim, & Ahmad, 2010). Among these, Reactive Dyes (pigments activity) is one kind of dyes that are widely used in the dyeing of cellulose fibers and cotton, and especially colorants containing components difficult to treat such as azo, formazan, triarylmethane, and phthalocyanine (Benkhaya, M 'rabet, & El Harfi, 2020; Gupta & Suhas, 2009). Therefore, their residues in sewage water pollute the environment severely, affecting aquatic flora and fauna, and is a carcinogen for humans (Berradi et al., 2019). Cite this article as: Nguyen Thi Ngoc Mai, Nguyen Thi Ngoc Thao, & Duong Thi Giang Huong (2021). Investigation of the removal of Reactive Blue 220 dye by gum extracted from taramind seeds. Ho Chi Minh City University of Education Journal of Science, 18(9), 1699-1710.