The method of biological treatment of concentrated wastewater

 

(57) Abstract:

The method is designed for biological treatment of concentrated wastewater (SW) containing ammonia nitrogen. HOLY treated in the aeration tank bacterial ooze on the basis of nitrifying and denitrifying bacteria at pH of not less than 7.0 with return of the bacterial sludge back into the cycle. ST. passed through the aeration tank with speed, providing the specific load of ammonium nitrogen 0,03-0,4 kg per 1 m3the useful volume of the aeration tank per day with continuous aeration of water in the entire volume of the aeration tank. The invention improves the depth of wastewater nitrogen compounds, to simplify the process flow through the cleaning chamber in the aeration tank and to reduce energy consumption.

The invention relates to a method of biological treatment of concentrated wastewater from phenols, rhodanides, ammonia nitrogen and other nitrogen compounds and can be used in the coking, chemical and petrochemical industries.

There is a method of biological treatment of concentrated wastewater from phenols, rodando and ammonia nitrogen by treating the wastewater in the one who rivalrous, phenol - and rodorazreshajushchaja bacteria. The method includes the recirculation of sludge mixed with recirculation ratio 1.4 to 2.5 /1/. The disadvantages of the method include the

1) low treatment effect from ammonium nitrogen - 49,3-89,7%, the residual content in the waste water is not less than 64 mg/l;

2) translation of the ammonium nitrogen contained in the wastewater, not less harmful product - nitrites or nitrates, clearing from which (denitrification) in a way not provided (bacterial sludge is not entered denitrification bacteria);

3) the high energy cost of recycling wastewater in connection with the installation of the recirculation pumps.

Also there is a method for biological purification of waste waters from nitrogen compounds by aeration with activated sludge at rH2degree (aerobic), equal 18-25, and the age of the activated sludge 12-47 days /2/.

If the proposed parameters of the cleaning process is made possible under aerobic conditions to carry out the simultaneous occurrence of nitrification - the oxidation of ammonia nitrogen to nitrite and/or nitrate and denitrification - reduction of nitrite and/or nitrate to nitrogen gas and thereby to exclude the allocation of denitrification in a special Onineko nitrogen (residual content of ammonium nitrogen in the waste water is 140 mg/l when the content in the influent wastewater 700 mg/l);

2) the periodicity of the process, due to the static process conditions due to the necessity of maintaining rH2sludge mix equal 18-25.

During the process of sewage treatment in accordance with the specified method to increase the efficiency of cleaning is not possible due to the accumulation of toxic metabolic products of bacteria;

3) limit the scope of its use because of unfitness for the purification of highly concentrated wastewater containing toxic impurities such as phenols, Rodney and other similar compounds, due to inhibition of their nitrification process;

4) the complexity of managing periodic cleaning process in continuous receipt to clean a large volume of wastewater.

There is a method of biological treatment of concentrated wastewater from nitrogen compounds, phenols, and rodando treatment of bacterial sludge containing groups of nitrifying, denitrifying, phenol - and rodorazreshajushchaja bacteria in the aeration tank, consisting of alternating aerobic and anaerobic chambers, when the pH of the medium is not less than 7.0 with recirculation of sludge mixture. According to this method, one part Odesaoblenergo sludge, subjected to forced recirculation between cameras.

In aerobic cells, where waste water is continuously aeronauts air, is the destruction of phenols, cyanides, rhodanides, as well as ammonia nitrogen, which is oxidized with the formation of nitrites and/or nitrates. In turn, in an anaerobic chamber (oxygen-free), which receives water from the aerobic chambers, denitrification formed in aerobic cells nitrites and/or nitrates using as a carbon source for bacteria-denitrification phenols and rodando source of waste water supplied in these anaerobic chamber (prototype) /3/.

The disadvantages of this method are

1) low efficiency of nitrogen compounds content in waste water after cleaning ammonia nitrogen 52-65 mg/l, nitrate 41-105 mg/l when the content in the influent wastewater ammonia nitrogen 530-650 mg/l);

2) the complexity of the technological scheme of purification, due to carrying out the cleaning process in two separate stage nitrification and denitrification occurring simultaneously in different cells of the aeration tank; nitrification in aerobic cells, denitrification in anaerobic, and therefore mu forced circulation of the wastewater;

3) high energy costs to operate the installation associated with the operation of pumps, providing a high ratio of recycling wastewater for cameras, the need to install special mixing device in anaerobic chambers to maintain the activated sludge in suspension.

The task of the invention is to remedy these disadvantages.

The problem is solved by a method of biological treatment of concentrated wastewater containing ammonium nitrogen, including treatment in the aeration tank bacterial ooze on the basis of nitrifying and denitrifying bacteria, and aeration at pH environment of no less than 7.0, with return of the bacterial sludge back into the cycle, the waste water is passed through the aeration tank with speed, providing the specific load of ammonium nitrogen 0,03-0,4 kg per 1 m3the useful volume of the aeration tank per day, while passing through the aeration tank effluent continuously aeronaut throughout the usable volume of the aeration tank.

Passing through the aeration of waste water with a speed that provides the specific load of ammonium nitrogen 0,03-0,4 kg per 1 m3the useful volume of the aeration tank per day with continuous the project processes of nitrification and denitrification. Anaerobic conditions for the occurrence of denitrification of nitrite and/or nitrate ions is achieved by continuous consumption (removal of water) of oxygen in the air supplied to the aeration, aerobic bacterially-nitrification. This method eliminates the need for separate aeration aerobic and anaerobic chamber and thus increase the efficiency of wastewater treatment, as in the anaerobic zones of the nitrification process is not not possible). The decrease of the load to less than 0.03 kg of ammonia nitrogen per day per 1 m3the useful volume of the aeration tank leads to worsening conditions for the activity of anaerobic bacteria-denitrification due to the appearance in the waste will excess oxygen. In this regard, the waste water will begin to accumulate nitrites and/or nitrates. The increase in the specific loading above 0.4 kg per 1 m3aeration tank per day leads to an increase of the residual content of ammonium nitrogen in the wastewater.

The proposed method is as follows.

Example 1.

Waste water from coke production to content of 60 mg/l ammonia nitrogen, 500 mg/l of phenols and 350 mg/l p the duck is served in the aeration tank for biological treatment, where preloads bacterial sludge containing complex nitrifying and denitrifying microorganisms along with phenol and rodorazresheniye microorganisms and subjected to continuous aeration with compressed air by maintaining the pH of the wastewater dosing of alkaline reagent to 7.0. The purified waste water containing ammonium nitrogen 0-5 mg/l, nitrate 0-5 mg/l, nitrides 0-5 mg/l phenols 0.1 mg/l, rodando 0.05 mg/l is continuously withdrawn from the aeration tank and enters the sump, which is asserted from suspended therein bacterial sludge. After settling the sludge back to the aeration tank with a recirculation pump with a coefficient of recycling grey water, 0.3. Purified water is removed from tank and used for the needs of the company.

Example 2.

Waste water from coke production to the content of 400 mg/l ammonia nitrogen, 500 mg/l of phenols and 350 mg/l of rodando with the unit load of 0.15 kg of ammonia nitrogen for 1 m3the useful volume of the aeration tank per day continuously fed into the aeration tank for biological treatment, where pre-loaded bacterial sludge containing complex nitrifying and denitrifying microorganisms along with phenol and Rodan who offered water dosing of alkaline reagent is not lower than 7.0. The purified waste water containing ammonium nitrogen 5-10 mg/l, nitrite and nitrate 0-5 mg/l phenols 0.1-0.2 mg/l and rodando 0.05 mg/l is continuously withdrawn from the aeration tank and enters the sump, which is asserted from the sludge and is removed from the cycle. The sludge back to the aeration tank for waste water recirculation pump with a coefficient of recycling grey water, 0.3.

Example 3.

Waste water from coke production to the content of 800 mg/l ammonia nitrogen, 500 mg/l phenol and 500 mg/l rodando continuously with the unit load of 0.4 kg of ammonia nitrogen for 1 m3the useful volume of the aeration tank per day served in the aeration tank for biological treatment, which preloads the bacterial sludge containing complex nitrifying and denitrifying microorganisms along with phenol and rodorazresheniye microorganisms and subjected to continuous aeration with compressed air by maintaining the pH of the wastewater dosing of alkaline reagent is not lower than 7.0. The purified waste water containing ammonium nitrogen 10-20 mg/l, nitrite and nitrate 5-10 mg/l phenols 0.1-0.2 mg/l and rodando 0-0,5 mg/l was continuously supplied to the sump, which is asserted from activated sludge. Pooled active and biological treatment.

The purified waste water is removed from the cycle and can be used for the needs of the company.

Implementation of the proposed cleaning method will allow

1) to reduce the content in waste water of ammonium nitrogen to 0-5 mg/l, nitrites and nitrates to 0-5 mg/l phenols to 0.1 mg/l and rodando to 0.05 mg/l without increasing the processing time (in a known way the content in waste water after cleaning ammonia nitrogen 52-65 mg/l, nitrite 41-105 mg/l at the same content of these impurities in the raw wastewater);

2) to carry out the cleaning process in a single chamber of the aeration tank, which enables to simplify the process flow by eliminating from the aeration tanks anaerobic zones (chambers);

3) to reduce the energy consumption for recycling wastewater from the aerobic to the anaerobic zone and the installation costs of the recirculation pumps (by reducing the coefficient of recirculation bacterial sludge from 1.5 to 0.3);

4) to implement a wastewater treatment technologies from ammonium nitrogen on the existing volume of biological treatment plants with virtually no reconstruction.

Conducting processes of denitrification and nitrification in a single aerobic chamber by increasing the efficiency of purification of Vooruzheniy biological treatment almost without retrofitting or construction of new facilities. Thanks to the combination of nitrification and denitrification in the same zone (zone of aeration) released volume of buildings, intended for conducting the process of denitrification. This volume structures it is possible to use to increase the depth of the wastewater, thereby increasing the effectiveness of decontamination of the CCP.

Sources of information

1. A. S. USSR N 1673533, MKI C 02 F 3/02, 1989.

2. A. S. USSR N 1169947, MKI C 02 F 3/30, 1983.

3. Pat. USSR N 1799366, MKI C 02 F 3/30, 1991.

The method of biological treatment of concentrated wastewater containing ammonium nitrogen, including treatment in the aeration tank bacterial ooze on the basis of nitrifying and denitrifying bacteria and aeration at pH environment of no less than 7.0 with return of the bacterial sludge back into the cycle, characterized in that the waste water is passed through an aeration tank with speed, providing the specific load of ammonium nitrogen 0,03 - 0,4 kg per 1 m3the useful volume of the aeration tank per day, while passing through the aeration tank all the waste water continuously aeronaut in the whole volume of the aeration tank.

 

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