Abstract
According to the characteristics of aniline dyeing wastewater, aerobic biological treatment was adopted herein, and high-throughput sequencing technology was used to analyze the changes to the microbial community structure and diversity in the aerobic sludge acclimation stage. As a result, according to the experimental study on the effects of different biomass, the initial pH value and the salinity with the aerobic biological treatment, the chemical oxygen demand (COD) degradation rate can increase linearly with the increase in biomass under different biomass conditions. The organic matter degradation rate is 6.24 mg/L COD·h−1·(mg/L·MLSS)−1, with a correlation coefficient (R2) of 0.98704. When the initial pH value is less than 7.0 ± 0.2, the COD degradation rate increases with the increase in the initial pH value and then decreases gradually. The optimal sludge concentration is 4 g/L; the optimal initial pH value is in the range of 7.0–8.0; the optimal salinity is 1.7%. When the initial concentration of COD is 3000 mg/L, the COD value gradually stabilizes and decreases to 1500 mg/L after 32 h, the degradation rate reaches 50%, and the pH decreases from 7.5 to 4.5. Sphingopyxis has been detected in sludge samples from the third cycle of acclimation, which can biodegrade aromatic compounds, anthraquinone dyes, and their intermediates, and the relative abundance of Sphingopyxis increased from 0.18% to 5.08%, indicating a potential biodegradation ability of aniline dyeing wastewater.
Highlights
In China, the dyestuff industry is a traditional chemical industry, and the dye production quantity is higher than 60% of the total production of other countries
Activated sludge was inoculated into the reactor, and the chemical oxygen demand (COD) degradation in the wastewater by activated sludge at each acclimation stage was measured, as shown in
Activated sludge was inoculated into the reactor, and the COD degradation in4 of the wastewater by activated sludge at each acclimation stage was measured, as shown in Figure 1 and Table 2
Summary
In China, the dyestuff industry is a traditional chemical industry, and the dye production quantity is higher than 60% of the total production of other countries. The annual production value of the dyestuff industry in China is 100,000 tons, and production has been rising gradually, recently [1]. The salinity in industrial wastewater has reached. 10–20% [7], increasing the difficulty of treating aniline dyeing wastewater. In addition to high salinity, numerous toxic and difficult-to-degrade pollutants, such as benzene ring compounds, are present in aniline dyeing wastewater. When aniline dyeing wastewater is directly discharged into the natural environment, the soil, groundwater, and surface water are seriously polluted. The European Union issued a social convention to prevent the aquatic environment from being harmed by organic wastewater with higher salinity.
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