SU1255587A1 - Method of biological purification of waste water from nitrogen - Google Patents

Description

I

The invention relates to the purification of waste Bod and can 6fJTb used in the bioloption treatment of nitrogenous wastewater.

The goal of the invention is to increase the speed of denitrification, reducing substrate consumption and energy consumption. The method is carried out as follows.

The organic substrate, which is a sediment of wastewater, waste production, concentrated wastewater, etc., containing complex organic compounds, ifanpHMBp carbohydrates, fats, proteins, etc., is subjected to anaerobic destruction by acidic fermentation, in particular, , it can be acetic acid,: acid, propnonic acid and other and or mixed types of fermentation. As a result, organic acids are formed (so-called light, heavy t-sulphuric acids), are removed, al-degides and other simple organic compounds.

Bacteria, veduirge acid fermentation process, functioning in a mixed culture and possessing high enzymatic activity, carry out non-mediated destruction. virtually all organic compounds.

The duration of the process depends on the quality of the initial substrate and temperature. The main quality indicator, but copolyrolate, is an acidic fermentation process, an indicator of volatile fatty acids (VFA). The absolute value of its individual for each type of source substrate. In the case of sour collection of sludge generated during the treatment of urban wastewater, it lies in the range of 46-50 mg eq / l. The process of sour gathering: nodding should be carried out until the JDKK reaches its maximum: zelichi, since it is in this case that the largest amount of easily digestible substrate is formed.

Obtained by acidic sbr-; c; shan the substrate is mixed with waste Boda containing 1; nitrates or (and, n) nitrites and fed to the de and stage; grification.

Simple organic compounds

acids, aldehydes, snares, etc. ,

resulting from acid fermentation51. They are good easy to adapt.

my substrate for denitrile bacteria, which, at a high rate and efficiency, use these compounds in their energy metabolism by oxidizing them with oxygen of nitrates or nitrites.

The density of denitrification is IO-15 mg / g h. The specific consumption from the substrate is 5.7 mg COD la mg of nitrogen

to nitrates. In the process of denitrification, 70% of the substrate is utilized, which determines the low residual content in organic water of soybean and zinen1ie, requiring aerobic

5 additional oxidation, a small air flow and, accordingly, energy consumption for the process.

When the nitrogen content in the source water in ammonia is preliminarily nitrified, the mixture is then mixed with the prepared organosubstrate and fed to the denitrification stage. :

The process of denitrification of the mole is carried out in buildings of the type of active power pens. with silt containing bacteria of Denitrification, found in the Free-Float and their states, in structures such as biofilters with de-nitrificator bacteria, attached 25

hard loading and also when the load is in a fluidized state. Sewage passed stage

35 denitrification, ai, is fed to an aerobic biochemical additional oxidation of residual organic compounds, where the MIC wastewater is collected to the required values.

40 The speed of the denitrification process as compared with the known method is increased by 2-3 times, the process time is reduced, the substrate consumption is reduced by 1.75 times.

45 and energy consumption for additional treatment of residual organic components 3.5 times.

Preliminary anaerobic biochemical destruction of complex organic compounds by acidic fermentation allows one to obtain the benefit of a 1.11 μm1 substrate for depitrippcate bacteria with high speed and efficiency, utilization of the substances that occur in the process of energy metabolism, oxidation of nitrates, which allows the depth of utilization of substrates to solid loading and also under the condition that the loading is in a fluidized state. Sewage passed stage

denitrification, ai, is fed to an aerobic biochemical additional oxidation of residual organic compounds, where the MIC of waste water is collected to the required values.

The speed of the denitrification process, as compared with the known method, increases by a factor of 2-3, the process time is reduced, the substrate consumption is reduced by 1.75 times.

and energy consumption for additional oxidation of organic components by 3.5 times.

Preliminary anaerobic biochemical destruction of complex organic compounds by acid fermentation makes it possible to obtain the benefit of 1.11 m ti-1 substrate for depitrification bacteria with high speed and efficiency without utilization, utilizing it in the process of energy metabolism, oxidizing nitrates with oxygen, which also improves the depth of utilization subst3

at the stage of denitrification and reduce the cost of aerobic additional oxidation of residual components.

An example. The urban sewage sediment, having a concentration of 20 g / l, is subjected to anaerobic digestion by acid fermentation for 24 hours at 23 ° C until the indicator of JDKK magnitude is reached. 48.3 mg eq / l,} HPA of the fermented mass of 18,000 mg / l. Then, the mixture is mixed with waste water, containing nitrates at a concentration of 100 ng / l in nitrogen, and fed into the denitre;

In the denitrifier, which represents the construction of a tin aerotechnics with mechanical mixing, the bacteria-denitrifiers are located in

Energy consumption for the preparation of an organic substrate, kcal / l

Nitrate nitrogen concentration, mg / l

in the source water

E purified water

Specific consumption of substragg COD

that

 Mr (N-NO ,,)

Specific rate of de-nitrification, mg / g h

The degree of ut; 1lizatsii substrate,%

The residual amount of substrate entering the aero. additional oxidation, mg / l

Duration of aerobic oxidation, h

Specific air flow, water

VNGashn Order 4780/26 Circulation 864

Proiz.-poly. pr-tie, Uzhgorod, st. Project, 4

555874.

free-floating state. The duration of the denitrification process. 3.5 hours, as a result of which all nitrate nitrogen passes into the molecular 5 form and is desorbed. The residual amount of nitrate nitrogen per nitrogen 3 mg / l. The degree of improvement of the organic substrate is 70%, the COD of denitrified water, which is caught with the residual amount. unutilized substrate is 170 mg / l. Additional oxidation of the residual amount of organic substrate is carried out under aerobic conditions in

15 for 3 h with a specific air flow rate of 4.7 water. Comparative data of the technological parameters of the process are presented in the table.

100 2-5

5.7

10-15 70

170 3.2

4.7

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Claims (1)

METHOD FOR BIOLOGICAL WASTE WATER TREATMENT FROM NITROGEN, including preparing an organic substrate for denitrification, mixing wastewater with prepared substrate and denitrification, characterized in that, in order to increase the rate of denitrification, reduce substrate consumption and reduce energy consumption, the preparation of an organic substrate for denitrification is carried out by fermentation to the maximum content of volatile fatty acids in the substrate. X>