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Method for efficiently treating high-ammonia nitrogen raw water at low temperature

A technology of high ammonia nitrogen raw water and treatment method, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. safety and other issues

Inactive Publication Date: 2012-10-03
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that conventional treatment methods do not completely remove ammonia nitrogen from raw water, especially the problem that the treatment effect is not good under low temperature conditions and affects the safety of urban water use, and provides a treatment method for low-temperature high-ammonia nitrogen raw water

Method used

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specific Embodiment approach 1

[0012] Specific embodiment one: the treatment method of a kind of low-temperature high-ammonia-nitrogen raw water of the present embodiment is carried out according to the following steps: high-ammonia-nitrogen raw water passes through the biological nitrification unit, and more than 95% of ammonia nitrogen in the raw water is converted into nitrate nitrogen, and organic matter is removed ;The effluent of the biological nitrification unit flows through the biological ceramsite-sulfur-alkali filter bed for biological autotrophic denitrification. After the denitrification of microorganisms, the nitrate nitrogen or nitrite nitrogen is converted into nitrogen gas, so that the ammonia nitrogen in the water is completely removed; The effluent of the bioautotrophic denitrification unit is treated by conventional coagulation-sedimentation-disinfection process, and the raw water is purified.

[0013] The biological nitrification unit in this embodiment is a conventional biofilm aeration...

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the biological denitrification unit is a biological ceramsite-sulfur-alkali filter bed, using ceramsite, sulfur particles and CaHCO 3 Granular mixed filter material, in which sulfur particles are used as electron donors for autotrophic denitrification, ceramsite is used as filler, CaHCO 3 The particles provide an inorganic carbon source while regulating the pH. Ceramsite, Sulfur and CaHCO 3 The mixing ratio of the particles is determined according to the quality of the raw water. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: The difference between this embodiment and specific embodiments one to two is that the biological denitrification unit is a biological ceramsite-sulfur-alkali filter bed, and the mixed filter material of the biological denitrification unit is mixed according to the gradation, wherein the ceramic The particle size is 8-10mm; the sulfur particle size is 2-6mm; the sulfur particles can provide a huge specific surface area and provide attachment conditions for the growth of Thiobacillus denitrificans, so that a large number of Thiobacillus denitrificans attached to the surface of sulfur is nitrate nitrogen And the removal of nitrite nitrogen under low temperature conditions provides the premise. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention relates to a method for efficiently treating high-ammonia nitrogen raw water at a low temperature, belonging to the technical field of water treatment. The invention solves the problems of low ammonia nitrogen treatment efficiency at low temperature and further influencing the water supply security in the conventional treatment method. When the high-ammonia nitrogen raw water flows through a biological nitration unit, the ammonia nitrogen is transformed into nitrate nitrogen and organic substances are removed; and the nitrate nitrogen is transformed into nitrogen gas and is removed thoroughly by a biological ceramic grain-sulphur-alkali filter bed. The biological ceramic grain-sulphur-alkali filter bed unit provided by the invention adopts gradation and mix of ceramic grains, sulphur grains and CaHCO3 (sodium bicarbonate) grains. The ceramic grains and sulphur grains provide growth environment for denitrifying bacteria, and CaHCO3 (sodium bicarbonate) adjusts alkalinity and provides inorganic carbon source. The removal rate of the nitrate nitrogen at low temperature keeps 98% and the removal rate of the ammonia nitrogen at low temperature keeps 95%; as calcium in the effluent water is used as flocculant for reinforcing removal of SS (suspended solid) and total phosphorus, the quality of the effluent water is further enhanced. The method provided by the invention effectively transforms ammonia nitrogen into nitrogen gas at low temperature, and is particularly suitable for use in winter and in cold regions.

Description

technical field [0001] The invention relates to a water treatment method. Background technique [0002] With the acceleration of urbanization and industrialization, water pollution has become increasingly serious. A large number of pollutants, especially the excess of nitrogen and phosphorus in water bodies, have brought about eutrophication of water bodies and seriously affected water quality. Currently widely used raw water ammonia nitrogen removal methods include biological contact oxidation, biological aerated filter, biological activated carbon, etc. The main principle of these methods is to use the adsorption and oxidation of biofilm to convert ammonia nitrogen into nitrate or nitrite to achieve The purpose of ammonia nitrogen removal. However, these methods cannot completely eliminate the effects of nitrogen in water. At present, the main method for removing nitrate in water is denitrification, that is, using denitrifying bacteria to convert nitrate or nitrite into ...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 张光明万甜张盼月
Owner RENMIN UNIVERSITY OF CHINA
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