Salt-containing sewage simultaneous nitrification and denitrification denitrogenation method
A technology of nitrification and denitrification and sewage, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of ammonia nitrogen pollutant discharge up to standard, and achieve rapid degradation of substrate ammonia nitrogen, Effective removal and improvement of salt tolerance
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[0020] Example 1 Preparation method of nitrifying bacteria growth promoter
[0021] The preparation method of the nitrifying bacteria growth promoter of the present invention is as follows: (1) Prepare a metal salt solution according to the following composition and parts by weight: the metal salt is 40-100 parts by weight, preferably 50-80 parts by weight, and the metal salt is composed of calcium Salt, copper salt, magnesium salt and / or ferrous salt; (2) 5-30 parts by weight, preferably 10-20 parts by weight of polyamines are added to the metal salt solution before use. Further, the content of 0.5-15 parts by weight, preferably 2-10 parts by weight of inorganic acid hydroxylamine can be added before use.
[0022] The above method was used to prepare four types of nitrifying bacteria growth promoters according to the proportions and formulas of the promoters in Table 1, and the concentration of the promoters was 0.5 g / L.
[0023] Table 1 Formulation and ratio of accelerator
[0024]...
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[0025] Example 2 Preparation of Denitrification Bacteria
[0026] 1. Bacterial activation: The medium formula used for the bacterial activation and seed liquid culture of Staphylococcus coriolis FSDN-C is: beef extract: 6g / L, peptone: 8g / L, NaNO 2 :0.6g / L, methanol: 0.5mL / L; the activation medium formula of Arthrobacter FDN-1 and Flavobacterium wateri FDN-2: beef extract: 5g / L, peptone: 10g / L, NaNO 2 :1g / L, add 2.0% agar; the activation medium formula of Paracoccus denitrificans DN-3: KNO 3 :1g / L, sodium succinate: 8g / L, KH 2 PO 4 :1g / L, FeCL 2 : 0.5g / L, add 2.0% agar; the activation medium formula of Methylobacterium SDN-3 is: ammonium sulfate: 0.5g / L, methanol: 0.75mL / L, KH 2 PO 4 :1g / L, FeCL 2 : 0.5g / L; add 2% agar. Spread evenly on the plate and place it in a constant temperature incubator at 30°C for activation.
[0027] 2. Scrape the bacteria on the plate with an inoculation ring and inoculate them in the corresponding liquid culture solution, and culture for 1 to 3 days to th...
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[0030] Example 3
[0031] The characteristics of the salty sewage water quality of a chemical plant are: ammonia nitrogen is 60~200mg / L, COD concentration is 300~1000mg / L, BOD concentration is 200~700, salt content is 2~3%, pH 8.5. During the long-term operation of the system, the temperature is about 25℃, the dissolved oxygen is 0.5~2.5mg / L, and the pH is 7.8~8.2. Due to the influence of salt, the ammonia nitrogen removal effect in the system is poor, the total nitrogen concentration after treatment is as high as 150mg / L, and the SVI of activated sludge is greater than 200mL / g. Using the method of the present invention, the promoter I of Example 1 was added to cultivate the nitrifying bacteria in the activated sludge according to the promoter concentration of 30 mg / L in the sewage treatment system. After 3 days, the ammonia nitrogen was removed by 70%, and then it was put into the sewage treatment system. Add denitrification bacteria agent, add bacteria agent A to the sewage tr...
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