Effects and mechanisms of carbamazepine on manganese oxidation process in algae-bacteria system
With the development of industry and agriculture,the detection rate of emerging contaminants in water is increasing,which seriously threatens the safety of drinking water.As an environmentally friendly water treatment process with simple operation and maintenance,the filters are widely used,which can effectively remove emerging contaminants by adsorption of filter media and synergistic effect of algae and bacteria.In order to clarify the effect of emerging contaminants on the algae-bacteria system in the filters and to give full play to the removal of emerging contaminants by the algae-bacteria system,this study selected the algae-bacteria system composed of Microcystis aeruginosa and manganese oxidizing bacterium QJX-1 as the object of the study,and carbamazepine(CMZ)as the representative of emerging contaminants,and the biological manganese oxide,which has the ability of removing emerging contaminants,were used as the starting point,comprehensively explored the removal of the CMZ and the effect of CMZ on manganese oxidation in the algae-bacteria system.It was found that in the algae-bacteria system composed of Microcystis aeruginosa and QJX-1,the oxidizing capacity of biological manganese oxide on CMZ was 6.334 μg·g-1 and its adsorption capacity was 4.170 μg·g-1;the biodegradation capacity of algae and bacteria cells on CMZ was 1.307 μg·g-1,and the adsorption capacity of the cells was 0.245 μg·g-1,both of them showed the removal capacity on CMZ.The effect of CMZ on the process of manganese oxidation of the system showed the phenomenon of promotion at low concentrations(5 μg·L-1,50 μg·L-1)and inhibition at high concentrations(500 μg·L-1,5 000 μg·L-1).Further study from the manganese oxidation mechanism found that the low concentration of CMZ could promote the generation of superoxide radicals in the system,and compared with the system without CMZ,the luminescence intensity of superoxide radicals increased by 4 000～6 000 CLU,which then accelerated the process of manganese oxidation in the system.This study investigated the effect of CMZ on the process of manganese oxidation in the algae-bacteria system and its mechanism,which provided a better theoretical basis for clarifying the effect of the emerging contaminants on the algae-bacteria system and making full use of the algae-bacteria system to improve the water purification efficiency of the filters.
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