A～2/O Craft Sewage Biological Denitrification Characteristic Analysis And Technological Experimental Study Of ～(15)N Identification

With the rapid development of industry and agriculture, water body has been increasing polluted. Strengthening sewage disposal, controlling nitrogen, phosphorus nutrition material enter water body to prevent main way of water pollution from. The biological N and P removal technology has been used successfully to treat a variety of pollutants, particularly effective in nitrogen removal from wastewater. In China, most of the municipal wastewater is still treated with traditional methods, which can only remove organics (COD). This dissertation studies the mechanisms and processes of biological nitrogen removal from municipal wastewater. And presents the plant experiment technique reference and theory in the run rationally and reconstruct plant. This test has investigated the result of sewage disposal of A2/O craft at different HRT , temperature , DO , water quality ,etc. various kinds of influence factors, and investigate through paying the test many factors act on the best association under together on the basis of already knowing above-mentioned each kind of influence factors to act on alone, find out the condition which nitrification and denitrification both comparatively obvious, prepare for that adopt 15N isotope identification technical research denitrification mechanism next. In addition, it also proves that the result of invert A2/O craft is superior to traditional A2/O craft in denitrification. Laboratory experiment used 15N isotope identification technology to study the process of microbial nitrification and denitrification. The result showed that the δ15N of residual nitrate increased in manual configurating nitrate culture which 15N isotope when the denitrification acted. And gas, which had 15N isotope, had been increasing during the process of denitrification. In dynamic A2/O system , finds the anaerobic and anoxic district denitrification cause δ15N to rise ,and the aerobic district nitrification cause δ15N to drop.The research proved that the δ15N value was very effective to determine the qualitative and quantitative relationship, which affords practice experiment technique and theoretic method to the research on the wastewater denitrification. Key words: wastewater treatment;biological denitrification;A2/O craft;isotope...