Research On Iron Biofilm Used In Biological Denitrification

China’s urbanization level is increasing, many environmental problems aregrowing. Environmental infrastructure of small towns is very simple, and the lack ofcentralized sewage treatment facilities, small towns sewage pollution is more andscattered. Small town wastewater has the characteristic of water change is big andcomplicated compositions. Therefore seek an adaptation characteristic of small townsewage effluent treatment is the only way to achieve the sustainable development ofsmall towns of the economy and improve the quality of life of residents. My schoolresearch and develop small towns actual sewage treatment of contaminationprocess-Land treatment A/O system under the plow layer. It fully considered thecharacteristics of the change of water quality of water of small towns. It’s a lowaerobic unit processing load, lower energy consumption and lower operating costs,etc., are effectively deal with small towns sewage.The object of study is Land treatment A/O system under the plow layer.Although it has a high COD removal efficiency, stable operating conditions, such asa series of advantages the treatment effect has been built from the base model seemsthat this sewage treatment system in the presence of nitrogen are still some potentialfor further optimization.In this study, the technical problems of urban wastewater denitrification processwe propose a composite iron enzymatic biofilm technology. The purpose of thistechnique is to introduce the energy metabolism of biochemical reaction bymicrobial iron, it strengthens the role of iron ions involved in the role of electrontransfer and activator of enzymatic reactions, thereby enhancing microbial activity,thereby increasing the efficiency of biological denitrification. The technology willsolve the root causes of low efficiency of its nitrification in order to further optimizethe system to continue to reduce operating costs on the existing basis, improvenitrogen emissions targets.This experiment simulated Land treatment A/O system under the plow layer’sfilter section, we use real life as a system of sewage water and studie the different iron content of biofilm small test system. The experiments were investigated in thespring and summer nitrogen removal efficiency of different iron content of biofilmsystems with ordinary biofilm system, as well as the difference CODCrremoval,microbial activity, energy metabolism and electron transport system activity. Wefocus on microbial diversity systems research through metagenomic sequencingtechnology. Experiments from macro and micro perspectives clearly enhancedcomposite iron biofilm nitrification enzymatic mechanism of action, which providesa theoretical basis for the practical promotion and application of technology.The results of the experiment:(1) In spring and summer, the nitrogen removal of Ironbiofilm and its CODCrremoval were higher than traditional biofilm,we also find that within a certain range,the effect of promoting the biofilm with the iron on the iron content increases tostrengthen,6%ironbiofilm content-enhancing effect was most significant, but theiron of more than6%, the promoting effect will be decreased. In the spring, the ironcontent of6%of biofilm removal CODCrimproved13.3%, ammonia nitrogenremoval rate of16.4%, total nitrogen removal rate of30.5%. In summer, its CODCrremoval rate improved8.5%, ammonia nitrogen removal rate of12.4%, totalnitrogen removal rate of25.8%.(2) In spring and summer, the dehydrogenase activity and the activity of theelectron transport of Ironbiofilm system are higher than traditional biofilm’s activity.we also find that within a certain range, the effect of promoting the biofilm with theiron on the iron content increases to strengthen,6%ironbiofilm content-enhancingeffect was most significant, but the iron content of more than6%, the promotingeffect will be decreased. In the spring, iron content6%of the biofilm, thedehydrogenase activity increased40.5%, electron transport system activity increased43.8%. In the summer, the dehydrogenase activity increased37.3%, electrontransport system activity increased38.2%.(3) By metagenome detected, we find the iron content of6%of the biofilm andtraditional biofilm in species richness, community structure, dominant bacteria andhave an enormous difference. Iron content of6%of the biofilm species distribution more uniform and higher diversity. And some of these nitrification or denitrificationgenus unable or rarely detected in traditional biofilm samples, Iron ions changed thepopulation structure of microbial biofilms, promoting the growth of somedenitrifying bacteria, making the iron content of6%of the biofilm to obtain a higher,more stable nitrogen removal efficiency.