Nitrogen removal biological filter device and its application in the treatment of slightly polluted source water

Abstract

The invention discloses a nitrogen-removing biological filter device and application thereof in treatment of micro-polluted source water. The nitrogen-removing biological filter device comprises an upward flow filter column, a water inlet slot, a water inlet tube, a water outlet tube and an outlet water collector, wherein a supporting plate and a biological filter material layer are arranged in the upward flow filter column from bottom to top in sequence; the lower end of the upward flow filter column is connected with the water inlet slot by the water inlet tube; the water inlet tube is arranged below the supporting plate; the upper end of the upward flow filter column is connected with the outlet water collector by the water outlet tube; the water outlet tube is arranged above the biological filter material layer; the water inlet tube is connected with a constant-flow pump. The nitrogen-removing biological filter device disclosed by the invention can realize synchronous nitrification and denitrification without the need of aeration in an ammonia nitrogen degrading process, so that the ammonia nitrogen is finally converted into a nitrogen gas, and therefore, while energy resources are greatly saved, outlet water quality indexes of the ammonia nitrogen reach standards, and total nitrogen is removed very well.

Description

technical field [0001] The invention belongs to the field of water treatment technology, and in particular relates to a nitrogen removal biological filter device and its application in treating slightly polluted water source water. Background technique [0002] Slightly polluted source water refers to slightly polluted tap water source water. At present, the pollution of surface water in our country is serious, most drinking water sources are polluted by various types of nitrogen, among which the form of ammonia nitrogen is the most prominent. The high concentration of ammonia nitrogen in raw water indicates that the water body is being polluted. Ammonia nitrogen in drinking water may cause nitrite and smell problems at the end of the pipe network, thereby affecting drinking water quality and human health. The commonly used ammonia nitrogen treatment technologies for drinking water at home and abroad mainly include biological methods, physical methods and chemical methods....

AI Technical Summary

Problems solved by technology

However, the natural zeolite pores and channels used as biological carriers are usually filled with some exchangeable cations K + 、Na + , Ca 2+ , Mg 2+ 、Sr 2+ Blocked by water molecules and other impurities, pores and channels are poorly connected

This reduces the adsorption performance of natural zeolite to ammonia nitrogen; secondly, this method uses sludge as a biological source, which inevitably introduces a variety of microorganisms, which will not only make the limited competition between heterotrophic microorganisms and digestive flora (especially denitrifying bacteria) Organic matter reduces the degradation efficiency of ammonia nitrogen and increases the risk of harmful microorganisms appearing in drinking water; more importantly, the process does not consider the removal of total nitrogen, and the process uses full aeration, and excessive dissolved oxygen inhibits denitrification Degradation of nitrate nitrogen by bacteria, so that total nitrogen cannot be removed

Therefore, after using this method to treat the slightly polluted ammonia nitrogen water source, the harm of total nitrogen to human health has not been completely eliminated.

[0005] Both the activated zeolite biofilter and the low-density zeolite aerated biofilter are only improvements to the biological carrier of the natural zeolite biofilter. Although the removal efficiency of ammonia nitrogen has been improved, the removal efficiency of total nitrogen has not been taken as the research object.

In addition, in the existing ammonia nitrogen treatment methods for drinking water sources, although ammonia nitrogen can be quickly converted into nitrite nitrogen and nitrate nitrogen, the concentration of ammonia nitrogen in water is greatly reduced, but the converted nitrite nitrogen is the The real killer of human health, and nitrate will be reduced to nitrite in the stomach and saliva. When humans ingest excessive nitrite, it will induce methemoglobinemia and gastric cancer, which will cause harm to human health. fundamentally solve the problem

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