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Method for backwashing completely autotrophic nitrogen-removal process biofilter

A whole process autotrophic denitrification and biological filter technology, which is applied in the field of backwashing of the clogging problem of the biofilm whole process autotrophic denitrification (CANON) process, can solve the clogging and other problems, improve the treatment effect, simplify the operation, and solve the clogging problem. effect of the problem

Active Publication Date: 2014-01-15
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the backwashing method of the clogging problem existing in the whole process autotrophic denitrification (CANON) process of volcanic rock filter material

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  • Method for backwashing completely autotrophic nitrogen-removal process biofilter
  • Method for backwashing completely autotrophic nitrogen-removal process biofilter
  • Method for backwashing completely autotrophic nitrogen-removal process biofilter

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specific Embodiment

[0029] The volcanic rock biological filter is used to treat artificial high ammonia nitrogen distribution water, and an appropriate amount (NH 4 ) 2 SO 4 、NaNO 2 , NaHCO 3 、KH 2 PO 4 formulated without organic carbon sources. The specific water quality is as follows:

[0030] The mass concentration of ammonia nitrogen is 380-420mg / L; the mass concentration of nitrite nitrogen is 0-10mg / L; the mass concentration of phosphate is 0.5-2mg / L; the mass concentration of alkalinity (as CaCO 3 ) is 1600-1800mg / L.

[0031] The reactor is made of plexiglass biological filter column, with an inner diameter of 150mm and a height of 1500mm. It is heated by a water bath outside and has a total volume of 22L. The main internal volcanic rock biological filter material has a filling height of 1200mm and an effective volume of 8L. Upward water flow is adopted, and an aeration device is installed at the bottom, and the aeration volume is controlled by a rotameter.

[0032] The water inta...

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Abstract

The invention relates to a method for backwashing a completely autotrophic nitrogen-removal process biofilter and belongs to the technical field of treatment of high-ammonia nitrogen waste water. The method mainly includes: firstly, determining backwash time, namely backwash cycle, according to pre-blocking pH variation of the biofilter so as to keep the biofilter effective in treatment constantly; secondly, backwashing by means of air and water backwashing (intermittent aeration); and thirdly, restoring post-backwash treatment effect and decreasing aeration to reduce the inhibitory effect of dissolved oxygen on anaerobic ammonium oxidation bacteria. The method has the advantages that blockage of volcanic filter material in the process of CANON (completely autotrophic nitrogen-removal over nitrite) is eliminated successfully, the backwashing mode is simple and evidently effective, and feasible solutions to the blockage of biological filter material in the CANON process are provided.

Description

technical field [0001] The invention relates to the field of high ammonia nitrogen wastewater treatment, in particular to a backwash method for solving the clogging problem of a biofilm full autotrophic denitrification (CANON) process under the condition of high ammonia nitrogen wastewater. Background technique [0002] With the intensification of economic development and human activities, water pollution is increasing day by day, among which nitrogen pollution will lead to a series of problems such as eutrophication of water, isolation of atmospheric oxygen enrichment, generation of toxic substances, and increase of water treatment costs. The sludge digestion liquid of the sewage plant and various industrial wastewater (fertilizer production, food processing, printing and dyeing industry, landfill and landfill leachate, etc.) discharge a large amount of ammonia nitrogen, which has the characteristics of high ammonia nitrogen concentration and low C / N. Therefore, it is diffic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/02
CPCY02W10/10
Inventor 李冬崔少明梁瑜海杨卓苏庆岭吴青何永平张翠丹张玉龙周元正门绚杨胤范丹曾辉平张杰
Owner BEIJING UNIV OF TECH