Method and device for culturing oxidizing bacteria capable of quickly enriching nitrite

Abstract

The invention provides a method and a device for culturing oxidizing bacteria capable of quickly enriching nitrite. According to the invention, a sequencing batch activated sludge process is mainly adopted, and the enrichment is realized by gradually increasing the nitrite concentration in nutrient solution and controlling a dissolved oxygen process, wherein the main ingredient of the adopted enrichment nutrient solution is inorganic salt and the enrichment nutrient solution comprises trace element nutrient solution, buffer solution and sodium nitrite; and by adopting the device, the concentration of the dissolved oxygen is kept to be above 5mg / L, pH is kept at 7.2-7.9, and temperature is kept at 22-25 DEG C. By adopting the method provided by the invention, the growth of heterotrophic bacteria and ammonia oxidizing bacteria in sludge can be obviously inhibited, and finally, the nitrite-enriching oxidizing bacteria account for 85-90% of the total amount of the microorganism bacteria in the activated sludge and can bear higher and higher nitrite concentration; and finally, the oxidizing bacteria can treat nitrite waste water of which the concentration is up to 1000mg / L is obtained,and reduce the high-concentration nitrite in the waste water to be below 0.2mg / L.

Description

technical field [0001] The invention relates to the cross technical field of the combination of sewage treatment and biotechnology, in particular to a culture method and device for rapidly enriching nitrite oxidizing bacteria. Background technique [0002] Nitrite pollution comes from a wide range of sources, mainly in the production wastewater of chemical industry, chemical fertilizer, medicine, food, rubber industry, dye industry, paint pigment, textile industry and electroplating industry. Nitrite is a carcinogen. After entering the human body, nitrite can be converted into a carcinogen-nitrosamine under certain conditions. At the same time, inhalation of 0.2-0.5g of nitrite by the human body can cause methemoglobinemia, resulting in tissue hypoxia , to dilate blood vessels and lower blood pressure, and symptoms of poisoning appear. In recent years, frequent poisoning incidents caused by large-scale nitrite pollution in my country's water bodies have directly or indirect...

AI Technical Summary

Problems solved by technology

However, as one of the two types of nitrifying functional bacteria, nitrite oxidizing bacteria (NOB) are chemoautotrophic bacteria, and the generation time of nitrite reducing bacteria is long and the reproduction speed is slow. Contains exceptionally low (<5%) nitrite oxidizing bacteria or no nitrifying bacteria

Nitrite Oxidizing Bacteria from Ordinary Activated Sludge Difficult to Treat High Concentration Nitrite Industrial Wastewater

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