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Method for treating high-salinity high-concentration ammonia-nitrogen wastewater

A technology for ammonia nitrogen wastewater and treatment methods, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as inability to efficiently treat high-salt and high-ammonia nitrogen wastewater, and achieve the goal of overcoming inability The effect of treating wastewater resistant to high salt and high ammonia nitrogen

Inactive Publication Date: 2013-01-02
NANJING UNIV
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Problems solved by technology

[0010] Purpose of the invention: the purpose of the present invention is to solve the deficiency that the prior art cannot efficiently process high-salt and high-ammonia-nitrogen wastewater, and to provide a kind of nitrifying bacteria that adopts intermittent activated sludge method to domesticate and cultivate high-salinity and high-ammonia-nitrogen tolerance, and use the resistant High-salt, high-ammonia-nitrogen nitrifying bacteria treat high-salinity wastewater with a concentration of 500 mg / L ammonia nitrogen and a salt content of less than 35 g / L, so that the concentration of ammonia nitrogen in the effluent can reach less than 10 mg / L, achieving discharge standards

Method used

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  • Method for treating high-salinity high-concentration ammonia-nitrogen wastewater

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Experimental program
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Effect test

Embodiment 1

[0028] A treatment method for high-salinity, high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0029] The batch activated sludge method is used to enrich the ammonia nitrogen and salinity of the culture solution step by step. NaCl and KCl are used to simulate high salinity. The initial salt concentration is 5 g / L, and the final salt concentration is 30-35 g / L. L, the initial concentration of ammonia nitrogen is 30-60mg / L, the final concentration is 400-500mg / L, and the concentration of COD is 50mg / L-150mg / L; the enrichment culture of nitrifying bacteria is carried out alternately, and an enrichment culture cycle includes Two stages: the first stage: the cultivation and enrichment of salt-tolerant nitrifying bacteria, the cultivation conditions are: the salt content, calculated as NaCl and KCl, is 5g / L, the concentration of ammonia nitrogen is 30-60mg / L, and the concentration of activated sludge is 20~25g / L, temperature 25~30℃, pH 7~8, DO 4~6mg / L...

Embodiment 2

[0033] Example 2 High-salinity, high-concentration ammonia nitrogen wastewater treatment experiment

[0034] Get the high-salt, high-ammonia-nitrogen wastewater discharged from petroleum plants, chemical plants, chemical fertilizer plants and tanneries, and inoculate the pollution of salt-resistant and ammonia-nitrogen-resistant high-efficiency nitrifying bacteria obtained by domestication by the method of Embodiment 1 of the present invention into each sewage by 10% volume ratio Processed for 2 days, the specific experimental results are shown in Table 1:

[0035] Table 1 Treatment results of high salinity and high concentration ammonia nitrogen wastewater

[0036]

[0037] Shown by the experimental result of table 1, the present invention adopts intermittent activated sludge process, carries out the enrichment of nitrifying sludge by the method that alternately improves culture solution salinity or ammonia nitrogen concentration, obtains high salt resistance and high ammo...

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Abstract

The invention discloses a method for treating high-salinity high-concentration ammonia-nitrogen wastewater, characterized by: adopting sequencing batch reactor, accumulating nitrification sludge by alternately increasing the concentration of a nutrient solution or ammonia-nitrogen concentration, and domesticating to obtain high salinity-resisting high ammonia nitrogen-resisting nitrobacteria. According to the invention, the nitrobacteria can treat high-salinity wastewater having ammonia-nitrogen concentration of 500mg / L and having the salt content of no larger than 35g / L to make the effluent have the ammonia-nitrogen concentration of no larger than 10mg / L, thus the effluent achieve national level of discharging standard; the method has good effect on treating high-salinity high ammonia-nitrogen wastewater in chemical plant, leather factory, oil refinery and the like, can overcome the shortage that the nitrobacteria cannot simultaneously treat high-salinity and high ammonia-nitrogen wastewater existing in the prior art, and has important economic benefits and social benefits.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating high-salinity and high-ammonia-nitrogen wastewater by cultivating high-salinity and high-concentration ammonia-nitrogen-resistant nitrification bacteria, which belongs to the technical field of biological environmental protection. Background technique [0002] Nitrogen pollution is one of the important causes of water eutrophication. Controlling nitrogenous compounds in water plays an important role in maintaining water cleanliness and preventing water eutrophication. It has attracted extensive attention and research in recent years. Nitrogen-containing wastewater discharged from petroleum, chemical and fertilizer industries, such as leather wastewater, has the characteristics of high pollutant concentration, complex composition, and large discharge volume, and it is difficult to meet the discharge standards; especially these wastewaters are mostly characteriz...

Claims

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Application Information

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IPC IPC(8): C02F3/34C12N1/20
Inventor 刘波王铸吴彪万馥君徐根华屈晋云
Owner NANJING UNIV
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