Denitrification process constructed by heterotrophic nitrification-aerobic denitrification bacteria and application of denitrification process in treatment of rare earth ore ammonia-nitrogen wastewater
A technology of aerobic denitrifying bacteria and heterotrophic nitrification, applied in aerobic and anaerobic process treatment, mining wastewater treatment, water treatment parameter control, etc. Large land area and other issues, to achieve the effect of a wide range of bacteria sources, reduce sewage treatment costs, reduce the number and land occupation
Pending Publication Date: 2021-06-25
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the problems of slow proliferation of autotrophic nitrifying bacteria, large floor area and high amount of added alkali in the existing biological denitrification process, and develop a denitrifying denitrifying bacteria using heterotrophic nitrifying-aerobic denitrifying bacteria. Nitrogen process, and this process is used to remove ammonia nitrogen in the residual ammonium salt leachate of rare earth leaching sites, thus solving the problem of ammonia nitrogen pollution in weathering crust leaching type rare earth mines
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[0020] In order to enable those skilled in the art to fully understand the technical solutions and beneficial effects of the present invention, further descriptions are given below with reference to specific embodiments.
[0021] The invention takes the residual ammonium salt leaching solution of rare earth leaching site as the research object, simulates the residual ammonium salt leaching solution of rare earth leaching site with different ammonia nitrogen concentrations and different pH, and uses the process constructed by the invention to remove ammonia nitrogen. run processing. The ammonia nitrogen concentration, pH and influent flow rate of the simulated leachate are shown in Table 1, and the total amount of influent is 1L.
[0022] Table 1 The simulated leaching liquid ammonia nitrogen concentration, pH and influent flow rate of different batches
[0023]
[0024]
[0025] The residual ammonium salt leaching solution of the rare earth leaching site treated by the ...
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The invention relates to a denitrification process constructed by utilizing heterotrophic nitrification-aerobic denitrification bacteria and application of the denitrification process to removal of ammonia nitrogen in residual ammonium salt leachate in a rare earth ore leaching site. According to the process, heterotrophic nitrification-aerobic denitrification bacteria are used as denitrification strains, and denitrification treatment and up-to-standard discharge of the residual ammonium salt leachate in the rare earth ore leaching site are realized through the processes of water feeding, aeration, water discharging, backflow of part of treated water and the like. The constructed denitrification process can directly treat the residual ammonium salt leachate in the acid rare earth ore leaching site, the starting speed is high, alkali does not need to be added after starting, nitrification and denitrification are carried out in the same reactor, the denitrification speed is high, the occupied area is small, cost is low, and good application prospects are achieved.
Description
technical field [0001] The invention relates to the technical field of sewage treatment and mine treatment, in particular to a denitrification process constructed by using heterotrophic nitrification-aerobic denitrification bacteria and its application in removing ammonia nitrogen in the residual ammonium salt leaching solution of rare earth leaching sites. Background technique [0002] Weathered crust leaching rare earth ore is an important strategic mineral resource, and the problem of mine environmental pollution is becoming a key factor hindering the sustainable development of the rare earth industry. In the mining process of weathered crust leaching rare earth mines, a large amount of ammonium salt reagent is required, so ammonia nitrogen residue is one of the main factors of environmental pollution in such mines. The use of ammonia nitrogen leaching technology to remove residual ammonia nitrogen in tailings mines is an effective means to control ammonia nitrogen pollut...
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IPC IPC(8): C02F3/30C02F103/10
CPCC02F3/301C02F3/302C02F2103/10C02F2209/14C02F2209/06
Inventor 肖春桥胡锦刚刘雪梅邓祥意池汝安
Owner WUHAN INSTITUTE OF TECHNOLOGY