Biochemical treatment process for high-concentration ammonia-nitrogen-containing waste water

Abstract

The invention discloses a biochemical treatment method for wastewater with high ammonia nitrogen concentration. The method is as follows: nitrobacterium-enriched activated sludge is cultured in a nitrified sludge enrichment tank at first and then is led into a nitration treatment tank containing wastewater with high ammonia nitrogen content and low COD, and sewage after nitration treatment enters into a denitrification tank for nitrification and denitrogenation treatment, wherein, the process for culturing the nitrobacterium-enriched activated sludge adopts the intermittent activated sludge process and enrichment is performed by gradual improvement of the concentration of ammonia nitrogen in culture solution; the used enrichment culture solution comprises microelements including ferrum, magnesium, sodium and potassium and buffer solution, and particularly also comprises Ca<2+> with a concentration between 0.01 and 0.05 gram per liter; the final concentration of the ammonia nitrogen during the culture process is between 300 and 1200 micrograms per liter; and the COD is less than or equal to 200 micrograms per liter. The method can effectively process the wastewater with high ammonia nitrogen content and low COD value, and the processing method is simple and low in cost.

Description

technical field [0001] The invention relates to a method for treating wastewater containing ammonia nitrogen, in particular to a method for biochemically treating wastewater with high ammonia nitrogen concentration by inoculating nitrifying bacteria / denitrifying bacteria to improve the biochemical treatment capacity of ammonia nitrogen. Background technique [0002] With the rapid development of industry and agriculture, the problem of water pollution by ammonia nitrogen is becoming more and more serious. In recent years, the problem of removing and controlling nitrogenous compounds in wastewater has attracted extensive attention and research. Ammonia nitrogen wastewater mainly comes from production processes such as gas, coke, fertilizer, and oil refining catalysts, as well as leachate from landfills. [0003] There are physical and chemical methods and microbial methods to remove ammonia nitrogen in wastewater. Physical and chemical methods include steam stripping, air st...

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Problems solved by technology

[0005] CN1354786A discloses a method for cultivating high-concentration nitrifying bacteria in activated sludge. It uses sewage sludge and excrement sludge as inoculation sludge, and uses sludge dehydration filtrate or nitrification detachment liquid as a culture solution, wherein the ammonia nitrogen concentration is 100- 300mg / L, the concentration of ammonia nitrogen higher than 300mg / L will inhibit the growth of bacteria, and the enriched nitrifying bacteria cannot tolerate high concentrations of ammonia nitrogen

[0007] For a special kind of ammonia-nitrogen-containing wastewater, such as oil refining catalyst production wastewater, this type of wastewater mainly contains suspended solids (SS, 300-1000 mg / L), ammonia nitrogen (NH 4 + -N, 200~5000mg / L) and other pollutants, at the same time, its organic matter concentration is low (that is, the chemical oxygen demand COD value is low), and the above existing methods cannot be effectively treated

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