The degradation of the niclosamide in the sediment by the plant-microbial electrochemical coupled system
This study focused on the degradation of the niclosamide in the plant-sediment-microbial electrochemical coupled system and investigated the effects of the applied voltage,the plants(Acorus Calamus L.and Lolium Perenne L.)and the bio-surfactant(rhamnolipids)on chloramphenicol degradation.The results showed that a proper applied DC voltage could promote the degradation of the niclosamide in the sediment-microbial electrochemical coupled system.The half-life period of the niclosamide in the sediment-microbial electrochemical coupled system under 1.2 V was 11.59％shorter than that under 0.2 V.The degradation of the niclosamide in the sediment-microbial electrochemical coupled system was contributed by the plants.The degradation of the niclosamide under 1.2 V in the Acorus Calamus L.-sediment-microbial electrochemical coupled system and in the Lolium Perenne L.-sediment-microbial electrochemical coupled system was 7.43％and 1.58％shorter than those in the sed-iment-microbial electrochemical coupled system without any plant,respectively.The addition of an appropriate amount of rham-nolipid promoted the degradation of chloramphenicol in sediment.When 0.50 g·kg-1 of rhamnolipid was added to the Acorus Calamus L.-sediment-microbe electrochemical coupling system under 1.2 V applied voltage,the half-life of chloramphenicol degradation was minimized,reduced by 26.45％compared to without rhamnolipid.In the degradation process,the niclosamide in the coupled system was transformed into the 2-Chloro-4-nitroaniline,the 5-Chlorosalicylic acid,and other intermediate prod-ucts,then finally to CO2,H2O,etc.
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