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Responses of microalgal-nitrifying granular sludge to cadmium stress
To investigate the response of microalgae-nitrifying granular sludge to cadmium stress, a sequencing batch bioreactor was used to cultivate microalgae-nitrifying granular sludge. By adding different concentrations of Cd(Ⅱ) ions to the system, the pollutant removal efficiency, and changes of extracellular polymeric substances(EPS), photosynthetic pigments, and microbial community characteristics at each stage were analyzed. The results showed that granular sludge exhibited good adaptability to 1 mg/L Cd(Ⅱ). During this stage, the EPS in per unit mass of activated sludge increased from 46.2 mg/g to 87.2 mg/g. Cd(Ⅱ) of 5 mg/L inhibited the sludge to a certain extent, while Cd(Ⅱ) of 10 mg/L led to the collapse of the granular sludge system. The relative abundance of Nitrosomonas decreased by 6.3% under Cd(Ⅱ) stress. Microorganisms secreted a large amount of EPS under the stimulation of low concentrations of Cd(Ⅱ), which could effectively alleviate the invasion of Cd(Ⅱ), while high concentrations of Cd(Ⅱ) might break through the defense of EPS, leading to a decrease of microbial activity or even death. The relative abundance of Chlorella and Secenedesmus did not fluctuate significantly, but the content of photosynthetic pigments was negatively correlated with Cd(Ⅱ) concentration. Cd(Ⅱ) might have a greater impact on the photosynthetic capacity of algae, leading to insufficient oxygen supply in the system and affecting the process of nitrification, rather than causing massive algal death.
Responses of microalgal-nitrifying granular sludge to cadmium stress
To investigate the response of microalgae-nitrifying granular sludge to cadmium stress, a sequencing batch bioreactor was used to cultivate microalgae-nitrifying granular sludge. By adding different concentrations of Cd(Ⅱ) ions to the system, the pollutant removal efficiency, and changes of extracellular polymeric substances(EPS), photosynthetic pigments, and microbial community characteristics at each stage were analyzed. The results showed that granular sludge exhibited good adaptability to 1 mg/L Cd(Ⅱ). During this stage, the EPS in per unit mass of activated sludge increased from 46.2 mg/g to 87.2 mg/g. Cd(Ⅱ) of 5 mg/L inhibited the sludge to a certain extent, while Cd(Ⅱ) of 10 mg/L led to the collapse of the granular sludge system. The relative abundance of Nitrosomonas decreased by 6.3% under Cd(Ⅱ) stress. Microorganisms secreted a large amount of EPS under the stimulation of low concentrations of Cd(Ⅱ), which could effectively alleviate the invasion of Cd(Ⅱ), while high concentrations of Cd(Ⅱ) might break through the defense of EPS, leading to a decrease of microbial activity or even death. The relative abundance of Chlorella and Secenedesmus did not fluctuate significantly, but the content of photosynthetic pigments was negatively correlated with Cd(Ⅱ) concentration. Cd(Ⅱ) might have a greater impact on the photosynthetic capacity of algae, leading to insufficient oxygen supply in the system and affecting the process of nitrification, rather than causing massive algal death.
Responses of microalgal-nitrifying granular sludge to cadmium stress
CHEN Zhao (author) / LIU Shihao (author) / ZHU Lijuan (author) / CHANG Dezheng (author) / GAO Yan (author)
2025
Article (Journal)
Electronic Resource
Unknown
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