Enhanced textile wastewater treatment by a novel biofilm carrier with adsorbed nutrients. (March 2020)

• Record Type: Journal Article
• Authors: Mulinari, Jéssica; de Andrade, Cristiano José; Brandão, Heloísa de Lima; da Silva, Adriano; Guelli Ulson de Souza, Selene Maria de Arruda; Ulson de Souza, Antônio Augusto
• Is Part Of: Biocatalysis and agricultural biotechnology. Number 24(2020)
• Publication Date: 2020-03
• Subjects: Textile effluent -- Reactive Red 141 -- Decolorization -- Biologic treatment -- Pyrolyzed sludge -- Circular economy; Agricultural biotechnology -- Periodicals; Enzymes -- Biotechnology -- Periodicals; 660.6
• DOI: 10.1016/j.bcab.2020.101527
• Languages: English
• ISSNs: 1878-8181

Abstract

Abstract: This work aimed to enhance the biodegradation of synthetic textile wastewater using pyrolyzed sludge from an effluent treatment plant of a textile industry as biofilm carrier. The control carrier was compared to a carrier supplemented with nutrients (potassium, phosphorus, nitrogen, calcium, and sulfur) that were sequentially adsorbed. These nutrients are essential for microbial metabolism. First, the decolorization of the azo dye Reactive Red 141 (RR141) was tested and then, the biodegradation of synthetic textile wastewater was analyzed. The microorganisms present in each condition were identified by mass spectrometry. The supplemented carrier enhanced RR141 decolorization 3.6-fold and 1.8-fold when compared to free biomass and control carrier, respectively. The dye biodegradation followed a pseudo-second-order kinetics. The use of the supplemented carrier increased the rate constant 4.3-fold and 13.8-fold in relation to the use of control carrier and free biomass, respectively. For the synthetic textile wastewater, the supplemented carrier enhanced the decolorization 2.9-fold and 1.6-fold compared to free biomass and control carrier, respectively. The decolorization also followed pseudo-second-order kinetics, and there were increases of 8.8-fold and 3.5-fold in the rate constant with the use of the supplemented carrier in relation to free biomass and control carrier, respectively. Biofilm microorganisms were identified by mass spectrometry, which showed the presence of aerobic ( Lysinibaciullus fusiformis for example) and facultative anaerobic ( Escherichia coli and Kosakonia cowanii ) species. The supplementation of the biofilm carrier with nutrients can be an interesting alternative for the effective treatment of more complex effluents, such as textile wastewater. Graphical abstract: Image 1 Highlights: Pyrolyzed sludge was used as biofilm carrier. Biofilm carrier supplemented with nutrients enhanced the degradation of an azo dye. Supplemented carrier enhanced the decolorization of a synthetic textile effluent. Pseudo-second-order kinetics fitted well to color removal data. The biofilm microorganisms were identified by mass spectrometry.