The Study On Properties And Mechanism For The Fe~0-anaerobic Microbe System Removing2,4,6-trichlorophenol In Water

This paper studied the influence and mechanism of pH value effect “Fe⁰-anaerobic microbe”system degradation2,4,6-TCP through analysised the rprotein of2,4,6-TCP and pH value andcorrosion of Fe⁰and microorganism activity in different system. In addition we studied themechanism for degradation of2,4,6-TCP and the mechanism of bioactivity of microbial promote byFe⁰through other analysise method such as HPLC, GC/MS, SEM and so on. This paper mainly getthe following valuable study conclusions:（1）The degradation of2,4,6-TCP is mainly by microorganisms in “Fe⁰-microbial” system, Fe⁰can enhance the rate of degradation for microorganisms.（2） pH value have great influence on the degradation of2,4,6-TCP in “Fe⁰-microbial” system.The neutral partial alkali conditions is suitable for biological growth, the best initial pH value formicrobial system and “Fe⁰–microbial” system were9.0and8.0, respectively120h and reaction70h,2,4,6-TCP can be removaled completely. In Fe⁰system because of the corrosion of iron the pH valuewill increased to10.0, in that way, the rprotein of2,4,6-TCP only20%.（3） pH value has great influence on the activity of iron. In Fe⁰system iron could corrode whenthe pH<7.0, but when the system pH value>8.0, Fe⁰will passivation, couldn’t corrode.（4）The mechanism for degradation of2,4,6-TCP in different system is different.2,4,6-TCPcouldn’t degradate in Fe⁰system, the2,4,6-TCP may removed through adsorpted by Fe⁰. Thedegradation pathways of2,4,6-TCP in microbial system is:2,4,6-TCP�'2,4-DCP�'4-CP. Thedegradation pathways of2,4,6-TCP in microbial system is:2,4,6-TCP�'2,4-DCP�'4-CP�'phenol.（5）In “Fe⁰-microbial” system the synergy of Fe⁰and microbial mainly displays in adjustmentfunction of pH value and corrosion of Fe⁰and interface enrichment of Fe⁰. Fe⁰and microbial hascomplementary adjustment function to the system process pH value, they can make the Fe⁰-microbialsystem always tends to be neutral process pH value, this will be helpful for microbial growth andincrease the remove rate of2,4,6-TCP. The Fe²⁺and H2which comes from the corrosion of Fe⁰canprovide electronic donors and nutrition for microbial metabolism, so they should improve themicrobial dehydrogenase activity and increase the remove rate of2,4,6-TCP. In “Fe⁰-microbial”system, through the metabolism of microbial to hydrogen, acidic compounds product by acidificationbacteria and the corrosive ion （such as Cl-）product in the process of reductive dechlorination all ofthis will promote corrosion of Fe⁰.The Fe⁰has the function of Interface enrichment formicroorganisms, it can provide certain response surface for microscopic. So it would be moreconducive to the realization of adsorption electron transfer and mass and biological transformationfunction. （6） Fe⁰makes the proportion of globular bacteria decrease and aspen bacteria increasein"Fe⁰-microbial" system. The colony of microbes structure changed. Fe⁰still can make the microbesmore closely in structure, improve the compactness of microbial particles additionally.