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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

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The invention provides a simultaneous nitrification and denitrification denitrification method for salty sewage, which uses a nitrifying bacteria growth accelerator and a denitrification bacterial agent with similar growth conditions to solve the problem of ammonia nitrogen pollutants in saline sewage through a simultaneous nitrification and denitrification process Emissions up to standard

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  • Salt-containing sewage simultaneous nitrification and denitrification denitrogenation method

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Embodiment 1

[0020] The preparation method of embodiment 1 nitrifying bacteria growth promoter

[0021] The preparation method of the nitrifying bacteria growth promoter of the present invention is: (1) prepare the 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. Furthermore, before use, the inorganic acid hydroxylamine can also be added in an amount of 0.5-15 parts by weight, preferably 2-10 parts by weight.

[0022] Four types of nitrifying bacteria growth accelerators were prepared according to the ratio and formula of the accelerators in Table 1 by the above-mentioned method, and the concentrations of the accelerators were all 0.5g / L.

[0023] Formulation and rati...

Embodiment 2

[0025] The preparation of embodiment 2 denitrification bacteria agent

[0026] 1. Bacterial activation: The medium formula used for bacterial activation and seed liquid cultivation of Staphylococcus kosheri 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 waterii FDN-2 is: beef extract: 5g / L, peptone: 10g / L, NaNO 2 : 1g / L, add 2.0% agar; the activation medium formula of denitrification paracoccus DN-3 is: 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. After spreading evenly on the plate, place it in a constant temperature incubator at a temperature of 30°C for activation.

[0027] 2. Use the inoculation loop to scrape the bacteria on the plate and inoculate them in the correspondi...

Embodiment 3

[0031] The water quality characteristics of saline wastewater from a chemical plant are: ammonia nitrogen 60~200mg / L, COD concentration 300~1000mg / L, BOD concentration 200~700, salt content 2~3%, pH8.5. During the long-term operation of the system, the temperature is about 25°C, the dissolved oxygen is 0.5~2.5mg / L, and the pH is 7.8~8.2. Due to the influence of salt, the removal effect of ammonia nitrogen 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. Adopt the method of the present invention to at first add the accelerator I of embodiment 1 to cultivate the nitrifying bacteria in the activated sludge according to the accelerator concentration 30mg / L in the sewage treatment system, and after 3 days, the removal of ammonia nitrogen reaches 70%. Add denitrification bacteria agent, add bacteria agent A to the sewage treatment system according to 0.05% of the amount of sewage t...

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Abstract

The invention discloses a salt-containing sewage simultaneous nitrification and denitrification denitrogenation method; firstly, a nitrification bacteria growth promoter is added to a sewage biochemical treatment system, a denitrogenation inoculum is added when the ammonia-nitrogen removal rate is more than 70%, and simultaneous nitrification and denitrification biological denitrogenation treatment process is started; the nitrification bacteria growth promoter includes a metal salt and a polyamine substance, wherein the amount of the metal salt is 40 to 100 parts by weight, preferably 50 to 80 parts by weight, and the amount of the polyamine substance is 5 to 30 parts by weight, preferably 10 to 20 parts by weight; the metal salt is composed of a calcium salt, a copper salt, a magnesium salt and / or a ferrous salt. The nitrification bacteria growth promoter and the denitrogenation inoculum with similar growth conditions are adopted, and the problem of up-to-standard discharge of ammonia-nitrogen pollutants in the salt-containing sewage is solved through the simultaneous nitrification and denitrification process.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a simultaneous nitrification and denitrification denitrification method for salty sewage. Background technique [0002] In recent years, with the development of industry and agriculture, the discharge restrictions on industrial wastewater, landfill percolation water and urban sewage have become more and more stringent, and more and more attention has been paid to sewage treatment technology, especially the up-to-standard discharge of ammonia-containing wastewater has become an environmental protection field processing problems. Although ammonia nitrogen in wastewater can be treated by physical and chemical methods such as stripping, ion exchange, and chemical oxidation, these methods have problems such as secondary pollution by by-products and low treatment efficiency. In contrast, the biological method is a better method to control ammonia nitrogen pollutio...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C02F101/16
Inventor 高会杰郭志华孙丹凤赵胜楠
Owner CHINA PETROLEUM & CHEM CORP
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