| The face of increasingly serious water pollution problem especially nitrogen pollution, The experimental use of cement, sand, gravel, fly ash and reactive materials such as low-cost material made concrete eco-film piece as biofilm carrier, and design at a reasonable reactor, Research on concrete eco-film simultaneous nitrification and denitrification(SND) mechanism, in order to achieve low-cost nitrogen removal of sewage at technology and technical.The experimental use of artificial simulation with sewage water, after the mature biofilm, through single-factor and orthogonal experiments system studied the factors impact of SND effects in the membrane, and then test the conclusions. Under the best run in the reactor, Research on the change of the eigenvalue and microbiology in the reactor. Under these conditions, it has been analyzed the mechanism of SND nitrogen removal in the reaction system. Then the response to SND system dynamics model is derived, the following conclusions have been obtained:(1)Reactor at a temperature of around 25 degrees, HRT for 4h around, DO control in the 4.5mg/L or so, the influent C/N ratio in the 8 or so, returning around 2.4L/min flow, pH value of around 8.0, the system of SND best, in these conditions, NH3-N, TN, CODCr removal rates reached about 66%, 55%, 78%;(2) In the control of the best operating conditions, the reaction by monitoring the characteristics of value, such as DO, bacteria, etc. which can reveal changes in concrete eco-film reactor occurred SND mechanism, the reaction SND mechanism can be explained by the theory of macro-environment, micro-environment and microorganism;(3)Through based on the analysis of nitrification and denitrification reaction kinetics, established concrete eco-film reactor for SND kinetic model.
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