Decolourization and mineralization of Acid Red 27 metabolites by using multiple zoned aerobic and anaerobic constructed wetland reactor

Abstract

a b s t r a c tAcid Red 27 (AR27) is widely used in paper processing, textiles, foods, cosmetics, beverages and medicines. Effluents containing AR27 are discharged daily into the environment which can adversely affect human and animals as AR27 is classified as an endocrine disruptor. This study describes the application of an aerobic and anaerobic baffled constructed wetland (ABCW) reactor in the removal of AR27 from a solution of synthetic wastewater with 50 mg/L AR27 concentration. The ABCW reactor planted with Phragmites australis was set with intermittent aeration and 1 d hydraulic retention time. This system's performance was evaluated in terms of COD, NH 4 + , colour and mineralization of intermediates with and without aeration at different concentrations. Based on the performance and analysis of GCMS, FTIR, HPLC a degradation pathway for AR27 was proposed. The system achieved COD removal of 88%, NH 4 + removal of 98%, complete decolourization and mineralization. FTIR analysis showed that provision of intermittent aeration contributed to the removal sulphonic groups and aromatic amines. The performance of the ABCW is attributed to the long pathway travelled by the wastewater which increased contact time of pollutants with microbes and rhizomes; and the synergistic effect of the combination of rhizomes, microbes and supplementary aeration.

Continuous successive cycles of biosorption and desorption of acid red 27 dye using water hyacinth leaves as an effective, economic, and ecofriendly biosorbent

“…Amaranth azo dye (acid red 27; AR27) commonly occurs in wastewater generated by the food, textile, leather, paper, beverage, confectionery, photography, cosmetic, pharmaceutical, and phenol-formaldehyde resin industries [13][14][15][16]. At concentrations > 0.15 mg/kg, AR27 may cause acute and chronic toxicity, allergies, respiratory problems, birth defects, and tumors in humans [15,17].…”

Continuous biosorption of acid red 27 azo dye by Eichhornia crassipes leaves in a packed-bed column

“…Acid red 27 (AR27) is a highly water-soluble anionic azo dye that is used extensively in industries to color natural and synthetic textiles, and produce leather, paper, food, beverages, confectionery, pharmaceuticals 6 , 7 , cosmetics, phenol-formaldehyde resins, and photographic images 8 . These industrial activities produce large amounts of wastewater contaminated with AR27.…”