Effectiveness on color and COD of textile wastewater removing by biological material obtained from Cassia fistula seed

  • Minh Trung Dao Faculty of Resources and Environment, Thu Dau Mot University
  • Hung Anh Le Institute of Environmental Science, Engineering and Management, Industrial University of Ho Chi Minh City
  • Thi Khanh Tuyen Nguyen Faculty of Resources and Environment, Thu Dau Mot University
  • Vo Chau Ngan Nguyen Faculty of Resources and Environment, Can Tho University

Abstract

Nowadays, natural polymeric materials extracted from plants are the new alternatives for synthetic chemicals in water and wastewater treatment. The aim of this study is to evaluate the ability of Cassia fistula seed gum (CFG) as a coagulant aid with PAC in the treatment of textile wastewater. Jartest experiments were carried out to identify the optimal parameters of coagulation-flocculation for removing color and COD in synthesis wastewater containing Methyl blue and RB21 dyes, including pH, settling time, PAC dose, the optimal CFG dosage in comparing with the cationic polymer. After that, actual textile wastewater was treated by using PAC, PAC plus cationic polymer, and PAC plus CFG for evaluating the role of CFG. CFG supplementation has assisted the process effects at nearly 98% color, 85% COD for RB21 and 90% color, 70% COD for MB at the best dose of CFG 0.15 mL and 0.1 mL, respectively. The optimized parameters for the coagulation of real textile wastewater using PAC were pH = 6 and dose = 0.6 mL can removal 66% of color. By adding CFG to PAC, the efficient of treatment was increased about 70% even at the lower dosage of PAC and CFG (0.5 mL for each reagent). The yield of combining PAC and polymer was a little bit lower than PAC and CFG, for instant 68% color was decreased at the same condition. These achievements demonstrated a workable substitute of natural products such as Cassis fistula seed gum for synthetic chemical products in coagulation-flocculation process.

Published
Nov 1, 2016
How to Cite
DAO, Minh Trung et al. Effectiveness on color and COD of textile wastewater removing by biological material obtained from Cassia fistula seed. Journal of Vietnamese Environment, [S.l.], v. 8, n. 2, p. 121-128, nov. 2016. ISSN 2193-6471. Available at: <https://oa.slub-dresden.de/ejournals/jve/article/view/443>. Date accessed: 25 june 2018. doi: http://dx.doi.org/10.13141/jve.vol8.no2.pp121-128.
Section
Research articles

Keywords

COD removal, textile wastewater, Cassia fistula seed gum, coagulation, flocculation