Denitrification filter combined packing and application thereof

A denitrification filter and combined packing technology, which is applied in the field of nitrogen-containing domestic sewage and industrial wastewater treatment, can solve the problems of no accumulation of nitrite nitrogen and high pH, ​​so as to avoid sludge bulking and produce less sludge , cost reduction effect

Inactive Publication Date: 2019-04-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the problem of too high or too low pH in the reactor through the combination of different fillers, no accumulation of nitrite nitrogen is found during the experiment, and it has a good removal effect

Method used

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  • Denitrification filter combined packing and application thereof
  • Denitrification filter combined packing and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The low-carbon source in embodiment 1 adds the combined packing of high-efficiency denitrification filter, and is made up of iron-carbon filler, sulfur, porous material, wherein the mass ratio of each component of iron-carbon filler is reduced iron powder 45%, activated carbon 15% , copper powder 10%, calcium sulfate 20%, ammonium bicarbonate 5%, sodium bicarbonate 5%.

[0061] (1) Blend and mix the reduced iron powder, activated carbon, copper powder, calcium sulfate, ammonium bicarbonate and sodium bicarbonate, slowly add water with 20% of the raw material mass and mix to form a viscous mixture;

[0062] (2) Fill the mixture obtained in step (1) into a spherical mold with an inner diameter of 9mm, and dry it in a vacuum oven at 60°C for 8 hours;

[0063] (3) The product obtained after vacuum drying in step (2) was calcined at 400° C. for 2 hours under high-purity nitrogen to make iron-carbon filler.

[0064] (4) Static film-hanging stage: the combined filler is the i...

Embodiment 2

[0068] The low-carbon source in Example 2 is added with the combined filler of the high-efficiency denitrification filter. The combined filler in the reactor is iron-carbon filler, sulfur, oyster shell and volcanic rock from bottom to top, and its volume ratio is: iron-carbon filler: Sulfur: oyster shell: volcanic rock = 1:1:1:1, the combined filler accounts for 50% of the reactor volume, and the preparation method of the iron-carbon filler is the same as in Example 1.

[0069] Through the same static film-hanging stage as in Example 1, after the continuous culture stage and the stable operation stage, the average influent nitrate nitrogen concentration is 30 ± 5mg / L, C / N=1.5-2, and the influent dissolved oxygen DO= Under the conditions of 1.0-2.0mg / L and hydraulic retention time HRT=4h, the average concentration of nitrate nitrogen in the effluent is 1.8-3mg / L, the removal rate of nitrate nitrogen is 90-94%, and there is no ammonia nitrogen and nitrite nitrogen accumulation, ...

Embodiment 3

[0071] The low-carbon source in Example 3 is added with the combined filler of the high-efficiency denitrification filter. The combined filler in the reactor is iron-carbon filler, sulfur, medical stone and volcanic rock from bottom to top, and its volume ratio is: iron-carbon filler : sulfur: medical stone: volcanic rock=1:1:1:1, the combined filler accounts for 50% of the reactor volume, wherein the preparation method of the iron-carbon filler is the same as in Example 1.

[0072] Through the same static film-hanging stage as in Example 1, after the continuous culture stage and the stable operation stage, the average influent nitrate nitrogen concentration is 30 ± 5mg / L, C / N=1.5-2, and the influent dissolved oxygen DO= Under the conditions of 1.0-2.0mg / L and hydraulic retention time HRT=4h, the average concentration of nitrate nitrogen in the effluent is 2.3-3.2mg / L, the removal rate of nitrate nitrogen is 89-92%, and there is no ammonia nitrogen and nitrite The accumulation...

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Abstract

The invention discloses denitrification filter combined packing and application thereof. The combined packing comprises iron-carbon packing, sulphur and a porous material. The iron-carbon packing comprises reducing iron powder, activated carbon, copper powder, a pore forming agent and a pH regulator. The iron-carbon packing, the sulphur and the porous material are sequentially arranged in a denitrification combined filter from bottom to top. Iron-carbon microelectrolysis can be generated in water through the iron-carbon packing, generated ferrous and reducing hydrogen reduce nitrate nitrogen into nitrogen, meanwhile the nitrogen and sulphur serve as electronic donors for denitrification bacteria, an organic carbon source is less added, and autotrophy denitrification is realized. Meanwhile,the combined packing is high in film culturing speed, good in denitrification performance under the optimal operation technological parameters, wide in source and low in price. By combining differenttypes of packing, the problem that the pH in a reactor is too high or too low is solved, the problem of nitrite nitrogen accumulation is solved, and a quite good removal effect is realized.

Description

technical field [0001] The invention relates to nitrogen-containing domestic sewage and industrial waste water treatment technology, in particular to a denitrification filter combination packing and its application. Background technique [0002] With the development of the economy, due to the improvement of human living standards and the excessive use of agricultural chemical fertilizers, a large amount of nitrogen-containing domestic sewage and industrial wastewater are discharged into the water body. Excessive nitrogen content will cause eutrophication of the water body and can be transformed into "Three causes" substance nitrite and a serious threat to human health. Therefore, the research and development of economical and efficient wastewater denitrification treatment technology has become the focus and hot spot in the field of water pollution control engineering. Among many denitrification technologies, biological denitrification technology is economical, efficient and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C02F3/00C02F101/16
CPCC02F3/34C02F3/00C02F3/2806C02F2003/003C02F2101/16
Inventor 曲久辉彭剑峰郑绍智刘会娟齐维晓
Owner TSINGHUA UNIV
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