Method and reaction device for removal of total nitrogen from black and foul water by iron-carbon micro-electrolysis combined with natural zeolite in series

Abstract

The invention relates to a method and reaction device for removal of total nitrogen from black and foul water by iron-carbon micro-electrolysis combined with natural zeolite in series. A reaction column comprises Fe-C micro-electrolysis column and a natural zeolite reaction column, the Fe-C micro-electrolysis reaction column is communicated with the natural zeolite reaction column, and Fe-C micro-electrolysis reaction column is arranged above the natural zeolite reaction column. The upper part of the reaction column is communicated with a water tank, the lower end of the reaction column is communicated with an outlet pipe, black and foul water is contained in the water tank, the black and foul water passes the Fe-C micro-electrolysis reaction column under the action of the gravity, the process reduces nitrate nitrogen and nitrite nitrogen to ammonia nitrogen through electron transfer; ferrous ions appear in the effluent of the Fe-C micro-electrolytic reaction column; when the effluentflows through the natural zeolite reaction column, the residual ferrous ions and ammonia nitrogen in the water carry out ion-exchange with the zeolite until the water flows out. The removal rate of nitrate nitrogen is more than 95%, and the removal rate of the total nitrogen is more than 80%. The energy consumption is reduced, no residual sludge is discharged, and the effluent water quality reaches the national standard.

Description

technical field [0001] The invention relates to a method and a device for removing total nitrogen in water bodies, in particular to a method and a device for removing total nitrogen in black and odorous water bodies where total nitrogen is relatively difficult to remove. Background technique [0002] The methods for removing total nitrogen in water include anaerobic denitrification method, artificial wetland method, activated sludge method, chemical precipitation method, ion exchange method, and electrochemical method. Among them, the anaerobic denitrification method and the activated sludge method are two methods to remove total nitrogen through the action of microorganisms. The winter climate in Northeast my country is cold and the time is long. The use of these two methods will cause the denitrification performance of the effluent to weaken, and Many water bodies are wastewater with a low carbon-to-nitrogen ratio, and the environment is not suitable for the survival of mic...

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Problems solved by technology

[0004] 1. The reunion and compaction of iron powder are obvious, which will greatly reduce the utilization rate of iron

[0005] 2. During the reaction process, Fe2+ is still generated, causing the effluent to fail to meet the discharge standards

[0007] 4. Iron-carbon microelectrode nitrogen removal is mainly due to the active site of iron and the strong reducing ability of iron. If you want to reduce NO3--N and NO2--N to nitrogen, the conditions are harsh and the processing cost will increase

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