Method and device for quickly enriching ammonia oxidizing bacteria

Abstract

The invention provides a method and a device for quickly enriching ammonia oxidizing bacteria. The ammonia oxidizing bacteria are enriched by a sequencing batch reactor, a method of gradually increasing ammonia nitrogen concentration in a culture solution and a pH process controlling method; and the adopted culture solution for enriching comprises the inorganic salt used as a main component, and a trace element culture solution, a buffer solution and ammonia carbonate; and the concentration of dissolved oxygen in the culture process is maintained more than 5mg / L by a process controlling device, pH is maintained 7.0 to 8.5, and temperature is maintained 20 to 25 DEG C. By the scheme, the growth of heterotrophic bacteria in activated sludge can be inhibited obviously, and the enriched ammonia oxidizing bacteria are 60 to 65 percent of the total number of microorganism bacteria in the activated sludge, and are tolerant to high ammonia nitrogen concentration; and finally high-ammonia-nitrogen wastewater of which the concentration can reach 500mg / L can be treated, and high-concentration ammonia nitrogen in the wastewater can be reduced to less than 1.0mg / 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 method and device for rapidly enriching ammonia oxidizing bacteria. [0002] Background technique [0003] Eutrophication of water body is one of the global environmental pollution problems that need to be solved urgently. With the rapid development of industry and agriculture in our country, at the same time, due to the lack of effective environmental management and supervision system, the eutrophication of water body is becoming more and more serious, which directly affects the sustainable development of economy. [0004] Biological denitrification of sewage is currently the most economical and effective denitrification technology. Most of the existing sewage biological denitrification processes are based on the biological process of nitrification and denitrification. Nitrifying bacteria with good biological activity in ac...

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Problems solved by technology

CN101407776A discloses a kind of activated sludge of domestic sewage as raw material, the ammonia nitrogen concentration is controlled below 80 mg / L, the COD is in the range of 120-450 mg / L, and the enriched ammonia oxidizing bacteria account for only 100% of the activated sludge. A small proportion, the enriched ammonia oxidizing bacteria have weak ability to resist the impact load of ammonia nitrogen

Because the wastewater is rich in organic matter, there are a large number of heterotrophic bacteria in the enriched nitrification sludge, which is not conducive to the growth of nitrifying bacteria and the removal of high-concentration ammonia nitrogen wastewater

The method described in this article is not suitable for treating wastewater with ammonia nitrogen concentration higher than 300 mg / L and low organic matter content

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