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Biological filtering material for treating nitrate nitrogen in water

A biological filter material and denitrification technology, which is applied to the treatment field of wastewater containing nitrate nitrogen, can solve the problems of limited specific surface area of ​​filter material, decreased nitrate nitrogen removal rate, long growth cycle, etc. , the effect of high bacterial density

Active Publication Date: 2017-12-19
沈阳东源环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional technology is to mix massive sulfur and limestone as a filter material, or to fuse sulfur and limestone as a representative of patent WO00 / 18694 to serve as a sulfur autotrophic denitrification filter material, but considering that sulfur autotrophic denitrification bacteria The growth cycle is long and the specific surface area of ​​the filter material is limited, which leads to a large loss of biomass of sulfur autotrophic denitrifying bacteria when the water flow rate is fast, resulting in a decrease in the removal rate of nitrate nitrogen

Method used

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  • Biological filtering material for treating nitrate nitrogen in water

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Embodiment approach

[0020] figure 1 It is a schematic diagram of a biological filter material of a preferred solution of the present invention. Such as figure 1 As shown, the main components of the biological filter material include sulfur element 1, slow-release carbon source 2, metal oxide 3 and carbonate 4. On the surface of the biological filter material, sulfur autotrophic denitrifying bacteria 5 and heterotrophic denitrifying bacteria 6 are adsorbed on it to form a biofilm. During the process of treating nitrate nitrogen in water by the biological filter material, the elemental sulfur 1 provides electrons for the sulfur autotrophic denitrification bacteria 5 to denitrify the nitrate nitrogen to generate nitrogen and sulfate. The slow-release carbon source 2 provides electrons for the heterotrophic denitrifying bacteria 6 to denitrify nitrate nitrogen, generating nitrogen and generating a certain degree of alkalinity. The existence of carbonate 4 is to maintain the pH of the denitrificati...

Embodiment 1

[0023] For the treatment of low-concentration nitrate nitrogen wastewater: 3 groups of biological filter materials were used to conduct denitrification experiments. The control group 1 is a combined filter material of sulfur block + limestone block, and the control group 2 is the sulfur mentioned in the patent WO00 / 18694 Autotrophic denitrification filter material, experimental group 3 is the novel biological filter material embodiment provided by the present invention, wherein, the mass percent of sulfur simple substance is 60%, the mass percent of carbonate is 20%, the corncob slow release carbon source The mass percentage is 15%, and the mass percentage of the metal oxide is 5%. The operation was carried out in the same apparatus (cylindrical reactor, height 0.4 m, diameter 0.15 m) under the same conditions. The biological filter material was put into the reactor respectively, the height of the filter material layer was 0.3m, and the activated sludge from the secondary sedi...

Embodiment 2

[0027] For the treatment of medium and high concentration nitrate nitrogen wastewater: Artificial simulation of medium and high concentration nitrate nitrogen wastewater, the concentration of nitrate nitrogen is 50, 75, 100, 150 and 200mg / L respectively, using a new type of biological filter material to conduct denitrification experiments. Under the condition that the time is fixed at 12 hours, the concentration of nitrate nitrogen in the effluent is 2.2, 3.8, 4.5, 8.9 and 12.1mg / L, showing a good removal ability.

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Abstract

The invention provides a novel biological filtering material for treating nitrate nitrogen pollutants in living and industrial wastewater. The biological filtering material is used for performing denitrification removal on nitrate nitrogen in water through two principles of sulfur autotrophic denitrification and heterotrophic denitrification. The biological filtering material contains electron donor sulfur elements for sulfur autotrophic denitrification bacteria, a slow-release carbon source used for growth of heterotrophic denitrification bacteria, and metal oxide and carbonate for improving the attribute of biological surface charges. A large quantity of autotrophic and heterotrophic denitrification bacteria can grow on the surface of the biological filtering material, so that the nitrate nitrogen in the water can be treated efficiently, besides, the yield of excess sludge is low, the pH value in a reaction process does not need to be regulated and controlled, and the use period is long.

Description

technical field [0001] The invention relates to the field of treatment of waste water containing nitrate nitrogen, in particular to a biological filter material. Background technique [0002] Groundwater, domestic sewage and industrial wastewater usually contain a certain concentration of nitrate nitrogen pollutants, including nitrate and nitrite. Nitrate can be reduced to nitrite in the human body, and nitrite interacts with human blood, causing the blood to lose its oxygen-carrying function, resulting in hypoxia poisoning; nitrite reacts with secondary amines inside and outside the human body to form nitrosamines When it reaches a certain dose in the human body, it is a carcinogenic, teratogenic, and mutagenic substance, which is harmful to human health. Therefore, the content of nitrate nitrogen in water must be controlled. [0003] At present, the conventional nitrate nitrogen removal method is microbial heterotrophic denitrification technology, that is, carbon sources ...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/2806C02F2101/163C02F2209/06
Inventor 王有昭朱彤
Owner 沈阳东源环境科技有限公司
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