Performance and microbial community structures of hydrolysis acidification process treating azo and anthraquinone dyes in different stages

Abstract

In this study, performance of hydrolysis acidification process treating simulated dyeing wastewater containing azo and anthraquinone dyes in different stages was investigated. The decolorization ratio, COD removal ratio, BOD/COD value, and volatile fatty acids (VFAs) production were almost better in stage 1 than that in stage 2. Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS) confirmed the biodegradation of Reactive Black 5 (RB5) and Remazol Brilliant Blue R (RBBR) in hydrolysis acidification process. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analyses revealed that significant difference of microbial community structures existed in stage 1 and 2. The dominant species in stage 1 was related to Bacteroidetes group, while the dominant species in stage 2 was related to Bacteroidetes and Firmicutes groups. From the results, it could be speculated that different dyes' structures might have significant influence on the existence and function of different bacterial species, which might supply information for bacteria screening and acclimation in the treatment of actual dyeing wastewater.

Facile approach for synthesis of stable, efficient, and recyclable ZnO through pulsed sonication and its application for degradation of recalcitrant azo dyes in wastewater

“…As illustrated in Fig. 5, the dye colour removal changed inversely to the initial dye concentration of RR4 [26]. Higher colour removal rate was obtained for the process study where the initial dye concentration of 10ppm solution relative lower initial concentration while the dye concentration was increased 10 times further.…”

Microbial degradation of dyes: An overview

“…Whereas, high molecular weight and complex structure containing dyes have low decolorization rate (Li et al, 2019). Increased dye concentration decreases dye decolorization and/or degradation (Liu et al, 2016).…”

Bacterial degradation of anthraquinone dyes

“…4). Liu et al (2017) found a new bacterial laccase from Klebsiella pneumoniae that could efficiently decolorize anthraquinone dyes. More enzymes with potential value for the biocatalysis of anthraquinone dyes are needed, because of their high efficiency.…”

“…In general, the dye decolorization rate decreases with increasing dye concentration. Liu et al (2017) reported that the decolorization rate of Remazol Brilliant Blue R reached more than 70% at low concentrations (10-30 mg/L) and then declined sharply, ultimately reaching only 15% at 200 mg/L. Printing and dyeing wastewater can have variable water quality, and the chromaticity difference can reach more than 4000 times, which requires researchers to cultivate and domesticate degradative bacteria that can adapt to a wide range of dye concentrations.…”