Experimental Study Of The Anaerobic Degradation Of Aniline In Riverbank Filtration System

Aniline is an important chemical material. According to the estimate of the chemical and industrial trade department, about 30,000 ton aniline was released into the environment per year, the water and soil was polluted in a wide area, which had a serious effect on our living. It was of intensity toxicity and difficult to be degraded --- aniline's half life was very long, even to 10 ages under the anaerobic condition. So it is necessary and also practical to study the degradation of aniline under the anaerobic condition, which would be propitious to develop the rehabilitation technologies to impose bioengineering and the application of them.To develop better the item imbursed by the Elite Plan of NorthWest Polytechnology University, named by the efficacy to remove contaminations by Riverbank Filtration system, and the item supported by the State Science Fund, named by the study on the transforming of the benzene series compounds and its strengthening measures by Riverbank Filtration system under denitrifying condition (No.40472127) , we researched the purification of aniline polluted water by Riverbank Filtration based on soil-column experiments, the effects of organic matters and hydrous metal oxides of the sediment in Weihe river on the anaerobic degradation of aniline based on microcosms test, respectively.Based on soil column experiments, we simulated and studied aniline degradation and its environmental effect during RBF under denitrifying and sulfate reduction, respectively. The results showed the biogeochemistry reactions of aniline in soil column were absorption and biodegradation, in which the biodegradation is major action in removing aniline actually. Under denitrifying or sulfate reduction condition, deamination was an absolutely necessarily step during aniline degradation. The degradation of aniline was complete under denitrifying condition. In the upper course of experiments, because organic matters were exhausted or virose matters were produced during aniline degradation, aniline degradation rate descended gradually. Additional carbon resources such as formic acid, sodium acetate, glucosewere appended in turn, which had no stimulative effects. Under sulfate reduction condition, aniline degradation was incomplete. The effects caused by this degradation of aniline were that the permeability decreased, pH varied and concentrations of several compounds increased.Effects of organic matters and hydrous metal oxides on the anaerobic degradation of aniline were investigated by removing organic matters and hydrous metal oxides in Weihe river sediments sequentially. The results showed: with additional carbon resources or not, organic matters had suppressive effects on aniline degradation. With additional carbon resources, hydrous metal oxides had stimulative effect on aniline. In microcosms test, electron acceptors concentration, additional carbon resources and aniline starting concentration had different effects on the original sediments,the sediment removed organic matter and the sediments removed organic matter and hydrous metal oxides.