| Water is the source of the life, and one of the irreplaceable natural resources on the earth. The nitrogen is one of the basic elements that exists extensively in the nature, and the important fertilizer of agricultural production, the growth, existence of the mankind and aninals or plants are all due to it. But when nitrogen exceed standard among the environment in water, it can endanger to the mankind and aninals or plants. At present, the question that nitrogen pollutes water already becomes the world environmental issue, and cause people's great attention more and more. Studying the mechanism that nitrogen damages water and puting forward the effective prevention and cure measure is one of the problems urgently to be solved presently.In water, nitrogen exists in form of organic nitrogen, ammonia nitrogen, nitrite and nitrate. Denitrification technology that use extensively now is biological procss, namely though project measure, oxidize the ammonia of wastewater into nitrate by nitrifying bacteria, then deoxidize nitrite, nitrate and other nitrogen oxides in the wastewater into nitrogen using denitrifying bacteria in order to eliminate pollution. For the sake of removing contamination of nitrogen completely after carrying out a biological disposal, it is very essential to understand the transformation situation of nitrogen element in the reactor which can offer certain parameter basis during designing the denitrification bioreactor. The purpose of this research is to expound removal and transformation rule of nitrogen element of antibiotic wastewater among bioreactor in detail aiming at existing anaerobic reactor and aerobic reactor of Zhumadian huazhong zhengda Co.Ltd.In anaerobic reactor, majority of biodegradable organic rubbish becomes NH4+-N of digestive juice. Because there is few multiplication of anaerobic microbial cell, only little nitrogen is turned into the cell. We find that NH4+-N of treated sewage is higher than wastewater after detesting UASB, UBF and IC. Moreover, the range of increasing is different. The increasing range in IC reactor is relatively large which accords with the principle of anaerobic digestion; Anaerobic reactor has no use to change of nitrite and nitrate. There are certain relations between change of NH/-N and COD, but it is not a quantitative relation. NH/-N in UASB and UBF rises along with increasing of COD, while NH/-N in IC reduces; Change of NH/-N value in reactor will influence total alkali degree, that is, total alkali degree rises to some extent along with rising of NH4+-N. In the course of anaerobic digesting, ammonia- nitrogen is important nitrogen source of microorganism, which of dissociate ammonia have certain control of microorganism at the same time in reactor. Yet toxicity of ammonia nitrogen is reversible, namely activation of bacteria of producing methane can still resume after NH/-N is got rid of or diluted under certain density. Activation of bacteria of producing methane can adapt to toxicity of ammonia nitrogen gradually, even tamed.CASS and SBR deal with denitrification that use extensively at present which has been proved in this paper. Dealing with aureomycin wastewater, SBR reactor has more effectual denitrification than CASS reactor which can achieve more than 70%. In SBR reactor, the removal ratio of NO3~-N and NO2~-N is lower than that of NH/-N. Because when nitrite and nitrate bacteria transform ammonia nitrogen into nitrate nitrogen, its own body andother microorganism also utilize NH4+-N as the nitrogen source to finish the assimilation of microorganism in order to maintain microorganism's own growth and metabolism. In addition, under certain condition some ammonia nitrogen will be blown into atmosphere, causing the reducing of density of ammonia nitrogen. The control of running time of SBR reactor exerts a tremendous influence to denitrification result. We prove that 6h is more rational aiming at aureomycin wastewater through analysing. |
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