RU76909U1 - INSTALLATION OF CLEANING OF PRODUCED CONCENTRATED WASTE WATERS - Google Patents

Abstract

The utility model relates to treatment plants for industrial concentrated wastewater containing volatile organic pollutants. The installation includes a unit for preparing water for biological treatment and a biological treatment unit, including a bioreactor, a biomass builder, an air purification unit, and a system of process pipelines for supplying wastewater and air, while the bioreactors are cylindrical devices containing an annular partition equipped with windows for wastewater inlet and dividing the bioreactor into the flotation zone and aeration zone, in which the nozzle with immobilizing material is fixed, and the biological treatment unit will complement It contains a cooling, control and temperature control system for the contents of bioreactors, including temperature sensors in the aeration zone of bioreactors, heat exchangers on the bioreactor circulation line, temperature sensors, flow meters, and control valves on the circulation line after heat exchangers. The technical result consists in the creation of an installation for the effective treatment of concentrated wastewater containing volatile organic pollutants. 1 n.p., 1 ill.

Description

The utility model relates to the field of biotechnology for the treatment of industrial wastewater containing high concentrations of organic pollutants and can be used in installations for the treatment of concentrated industrial wastewater, in particular, in enterprises of the petrochemical and chemical industries.

Wastewater from the chemical and petrochemical industries contains a complex set of organic pollutants: oil products, aliphatic and aromatic hydrocarbons, oxygen-containing aromatic compounds, phenols and others, many of which, when disposed of in biological treatment plants, have a detrimental effect on the microflora and active fauna silt.

The contribution of individual industries to the pollution of the combined industrial effluents of the petrochemical and chemical complex varies. While the wastewater of some industries contains organic substances in concentrations up to 1000 mg / l according to COD, acceptable for discharge to biological treatment plants (BF), the content of organic pollutants in others significantly exceeds the maximum permissible level for treatment at BF and amounts to 10,000 - 40,000 mg / L COD. The intake of wastewater with a high content of contaminants at the BFB causes poisoning of activated sludge and reduces the efficiency of treatment in general. To eliminate the negative impact on activated sludge, concentrated wastewater requires preliminary treatment in local conditions before biological treatment or disposal (for example, by incineration) arrives at the facilities. Biological treatment of concentrated wastewater is possible, which, as a rule, is carried out using a specialized microbial community selected for the treatment task. AT

In this case, for effective wastewater treatment, it is important to maintain the conditions in the bioreactor at a level optimal for the life of the microorganisms used, in particular, in temperature. However, a feature of the biological treatment of concentrated wastewater is that it is accompanied by the formation of a significant amount of heat, in which case there is a need for means to maintain the temperature in the bioreactor in a sufficiently narrow range.

A known installation for the treatment of concentrated wastewater, providing mesophilic or thermophilic conditions in the bioreactor depending on the purification task [US Patent No. 7156985, IPC C02F 3/00, decl. 04.16.2007, publ. January 2, 2007]. The installation includes: a) a bioreactor, which is a cylindrical vessel closed by a lid, divided into three cylindrical sections: the upper, middle, and lower, equipped with the first inlet and outlet nozzles located in the lower cylindrical section, for the liquid entering the contaminated and removed from the bioreactor, the second outlet a nozzle located in the lower part of the cylindrical section, a third outlet nozzle located in the upper cylindrical section and a plurality of inlet nozzles located in the lid; b) a heat transfer zone located inside the vessel between the third outlet pipe and the cover, including: 1) means for supplying ambient air to the heat transfer zone, including communications and a fan, 2) means for supplying the bioreactor liquid to the heat transfer zone, including communications, connected to the second outlet pipe for the circulating flow and the pump, 3) means for distributing the bioreactor liquid inside the heat transfer zone, including communications with spray nozzles, 4) vapor-phase outlet pipe k located in the lid of the apparatus for removing exhaust air from the bioreactor; c) the ultrafiltration unit on the membranes of solid particles from liquid connected with the outlet pipe of the bioreactor, and with communications providing return of the concentrated stream

into the bioreactor and the filtrate withdrawal from the installation as a purified stream. In addition, the installation includes pH maintenance means by which acid or alkali is introduced into the bioreactor, means for introducing biogenic additives in the form of water-soluble fertilizers into the bioreactor, aeration and mixing means of the bioreactor contents, through which air is introduced into the reactor and its contents are recycled.

A disadvantage of the known installation is the pollution of atmospheric air by volatile, foul-smelling, harmful pollutants of industrial wastewater, since the temperature of the contents of the bioreactor is maintained by means of direct heat transfer with the exhaust air into the external ambient air.

Closest to the proposed installation is a treatment plant for the production of concentrated wastewater containing volatile organic pollution [RF Certificate for Utility Model No. 7674, IPC C02F 9/00, decl. 07/04/1997, publ. September 16, 1998], which includes a unit for preparing water for biological treatment, which consists of a heat exchanger, a neutralization unit, and a nutrient supply unit, successively arranged in the direction of movement of the processed liquid, a biological treatment unit, including a bioreactor for building specialized biomass, which is a fermenter with pipelines for the supply of neutralized wastewater with nutrients, air and the removal of the bacterial suspension into the aeration tank, the aeration tank, closed with a cover with a tap, at The aeration tank contains an annular partition equipped with liquid inlet windows, which divides its internal space into a flotation and aeration zone, in which a nozzle with immobilizing material for microorganisms is fixed, and an air emission cleaning unit, including a biofilter connected to the aeration tank.

A significant disadvantage of the known installation is the lack of effectiveness of the biological treatment of concentrated wastewater.

The technical task of the claimed utility model is to create

plants for the effective treatment of concentrated wastewater containing volatile organic pollutants.

The problem is solved in that the installation for the purification of industrial concentrated wastewater containing volatile organic pollutants includes a unit for preparing water for biological treatment and a biological treatment unit including a bioreactor, a biomass extension unit, an air emission treatment unit, and a system of process pipelines for delivering wastewater and air, while the bioreactor, are cylindrical devices containing an annular partition, equipped with windows for wastewater inlet and dividing The bioreactor for the flotation zone and the aeration zone, in which the nozzle with immobilizing material is fixed, and the biological treatment unit additionally contains a cooling, control and temperature control system for the contents of the bioreactors, including temperature sensors in the aeration zone of the bioreactors, heat exchangers on the bioreactor circulation line, temperature sensors, flow meters and control valves in the circulation line after heat exchangers.

The essence of the utility model is a plant for the treatment of concentrated industrial wastewater containing volatile organic contaminants, including a unit for preparing water for biological treatment, which consists of a heat exchanger, a neutralization unit and a nutrient supply unit, and a biological treatment unit including a unit building specialized biomass, which is a fermenter with pipelines for feeding neutralized full-time water with nutrients, air and the removal of the bacterial suspension into the bioreactor, which is a cylindrical drainage device closed with a lid, containing an annular partition equipped with windows for wastewater inlet, which divides its internal space into a flotation and aeration zone, in which a nozzle is fixed with immobilizing material

for microorganisms, while the bioreactors are equipped with a cooling, monitoring and temperature control system for the contents of the bioreactors, including temperature sensors in the aeration zone and a heat exchanger installed on the circulation line, as well as a temperature sensor, a flow meter and a control valve on the circulation line after the heat exchanger, and an air cleaning unit emissions, including a biofilter connected to the bioreactor.

Effective treatment of concentrated industrial wastewater is achieved through the inclusion of new additional elements in the installation: 1) a cooling system, temperature control and regulation of the contents of bioreactors, including temperature sensors in the aeration zone of bioreactors, heat exchangers on the bioreactor circulation line, temperature sensors, flow meters and control valves on circulation lines after heat exchangers; 2) a bioreactor, which is a cylindrical apparatus containing an annular partition equipped with windows for fluid inlet, which divides its inner space into a flotation and aeration zone, in which a nozzle with immobilizing material for microorganisms is fixed.

Such an installation allows for deeper treatment of concentrated wastewater by maintaining the temperature in the bioreactors in the optimal area for the growth of microorganisms and biodegradation of the contaminants treated at the wastewater installation.

Comparative analysis with the prototype shows that the claimed utility model is characterized by the presence of:

- a cooling, monitoring and temperature control system for the contents of bioreactors, including temperature sensors in the aeration zone, a heat exchanger on the circulation line, equipped with a temperature sensor, a flow meter and a control valve on the circulation line after the heat exchanger,

- bioreactor, which is a cylindrical apparatus containing

an annular partition equipped with windows for fluid inlet, which divides its inner space into a flotation and aeration zone, in which a nozzle with immobilizing material for microorganisms is fixed.

Since when comparing the essential features of the utility model with those of the prototype, it was revealed that they are new and not described in the prototype, we can conclude that the claimed technical solution for the utility model meets the criterion of "novelty."

The technical solution according to the claimed utility model is presented in the figure.

The installation consists of two units: a unit for preparing water for biological treatment - A and a unit for biological treatment - B, which are connected by a piping system. The unit for preparing water for biological treatment A of industrial wastewater consists of a heat exchanger 1, a neutralization unit 2, and a nutrient supply unit 3. A biological treatment unit B includes a biomass building unit 4, bioreactors 6 and 6 ′, each of which is a cylindrical apparatus, which contains an annular partition 7 (7 ′) provided with windows 8 (8 ′) for the intake of sludge liquid, dividing it into an aeration zone 9 (9 ′) and a flotation zone 10 (10 ′), circulation pumps 5 and 5 (with supply pipelines, heat exchangers 14 and 15 in line circulation, temperature sensors 16 located in the aeration zone and on the circulation line after the heat exchangers, flow meters 17 and control valves 18 on the circulation line after the heat exchangers.In the aeration zone, a nozzle 11 (11 ′) is fixed, made in the form of parallel bars forming a grid with a rigid base on which the immobilizing material is stretched in the form of ruffs made of fiberglass or synthetic materials for microorganisms. The biological treatment unit also includes an air emission treatment unit, including biofilters 12 (12 ′) and fans 13 (13 ′) with supply pipelines. Roman numerals on the diagram indicate the main flows: I - waste water,

arriving for cleaning; II - wastewater after the heat exchanger, III - wastewater after the neutralization unit, IV - wastewater after the nutrient supply unit, V - wastewater after the biomass building unit, VI - wastewater obtained after mixing flows IV and V, VII - wastewater water obtained after mixing stream VI and pumping pump 5; VIII - wastewater from stream VII after heat exchanger 14, IX - partially treated wastewater from the bioreactor pos. 6 to pump inlet 5, X - treated wastewater from flotation zone 10, XI - air in the flotation and aeration zones of bioreactors 6 and 6 ′ and biomass building unit, XII - contaminated air from bioreactor 6 to biofilter 12 for biological treatment, XIII - air after biological treatment of the first stage, XIV - excess moisture after the biofilter into the sewer, XV - waste water obtained after mixing flow X and pump 5 ′, XVI - wastewater of stream XV after heat exchanger 15, XVII - treated wastewater from bioreactor 6 ′ to pump inlet 5 ′, XVIII - treated wastewater from flotation zone 10 ′ discharged into the sewer, XIX - polluted air from bioreactor 6 ′ per 13 ′ biofilter I biological treatment, XX - air after biological treatment of the second stage.

The proposed utility model meets the criterion of "industrial applicability", since the possibility of implementing a utility model is confirmed by a description of its operation.

Industrial wastewater I, the COD contamination of which is up to 30,000 mg / l, containing in its composition,% wt: propanal 0.04, acetone 0.08, ethanol 0.06, propanol 0.15, methylbutenal 0.04, butanol 0 10, ethoxypropanol 0.01, ethylbenzene 0.01, styrene 0.02, methylpentanol 0.01, propylene glycol 0.89, acetophenone 0.02, methylphenylcarbinol 0.06, phenol 0.04, enters heat exchanger 1, where it the temperature is brought to 28-30 ° C, then the wastewater enters the inlet of the pump 5, intended for circulation of water and biomass in the reactor 6, to mix with the waste water, and also to the inlet of the pump 5 concentrated water pump feeds from the neutralization unit 2

sulfuric acid in an amount that ensures the pH of the wastewater in the aeration tank is 6.5-8.0, 5% superphosphate solution and 25% ammonia solution are supplied by metering pumps from the nutrient supply unit 3. Part of the wastewater neutralized and with nutrients by stream IV (periodically, as necessary) is supplied to the biomass build-up unit 4, the main part of wastewater VI together with the biomass V suspension is fed to the inlet of the circulation pump 5, then fully or partially, depending on the indications a temperature sensor 16 installed in the aeration zone of the bioreactor 6, the flow enters the lower liquid layer of the bioreactor 6 through a perforated pipe, or, respectively, the flow passes completely or partially through the heat exchanger 14, s abzhenny on output line 16 a temperature sensor, a flow meter 17 and a control valve 18, enabling the temperature within the bioreactor 6 at 28-30 ° C. Air is supplied to the lower parts of the biomass extension unit and bioreactors 6 and 6 ′ through distribution rings with nozzles. To maintain a high dose of biomass in the bioreactors 6 and 6 ′, a nozzle in the form of parallel rods forming a lattice with a rigid base is placed in the aeration zone 9, 9 ′, onto which the immobilizing material is stretched in the form of ruffs made of fiberglass or synthetic materials. The separation of the bacterial suspension into purified water and biomass occurs in the flotation zone 10 and 10 ′, located in the center of the bioreactor. Wastewater with biomass enters the flotation zone 10 (10 ′) through the windows 8 (8 ′) on the annular partition, and air is supplied to the lower part of the flotation zone through a pipe with nozzles by flow XI. The biomass is separated by flotation with air bubbles and through the overflow through the top of the annular partition of the flotation zone enters the aeration zone of the bioreactor 6 and 6 ′. Treated and clarified wastewater containing in its composition,% wt .: propanal 0.02, acetone 0.04, propanol 0.08, methylbutenal 0.02, propylene glycol 0.4, acetophenone 0.02, methylphenylcarbinol 0.03, phenol 0.03, is removed from the bottom of flotation zone 10 by stream X and fed to the suction line of pump 5 ′, where it is mixed with stream XVII coming from the bioreactor

6 ′, then completely or partially, depending on the temperature in the bioreactor 6 ′, measured by temperature sensors 16, the flow is directed to the lower liquid layer of the bioreactor 6 ′ through a perforated pipe, or, respectively, the flow passes completely or partially through the heat exchanger 15 equipped with a sensor on the output line temperature 16, a flow meter 17 and a control valve 18, providing a temperature in the bioreactor 6 ′ at a level of 28-30 ° C. Purified and clarified wastewater from the flotation zone 10 ′ containing in its composition,% wt .: propanal 0.01, acet it is 0.01, propanol 0.02, methylbutenal 0.01, propylene glycol 0.1, acetophenone 0.01, methylphenylcarbinol 0.01, phenol 0.01, is removed from the bottom of the flotation zone 10 ′ by stream XVIII and discharged into the sewer for further treatment at traditional wastewater treatment plants mixed with other industrial and domestic wastewater.

Exhaust air from bioreactor 6, containing 0.250 mg / L ethylbenzene, 0.350 mg / L styrene, 0.090 mg / L acetophenone, 0.075 mg / L methylphenylcarbinol, is fed to a bulk biofilter 12 from natural materials for purification by flow XII. In the biofilter 12 there is a process of cleaning and deodorizing the air discharge. In the purified air (stream XIII) after the biofilter, the content of pollutants is as follows: ethylbenzene 0.030 mg / l, styrene 0.085 mg / l. The exhaust air from the bioreactor 6 ′ containing acetophenone 0.030 mg / l, methylphenylcarbinol 0.025 mg / l through a pipeline flows through a pipeline XIX into a 12 ′ bulk biofilter for purification. In the purified air (stream XX) after the biofilter, the contaminants are as follows: acetophenone 0.002 mg / l, methylphenylcarbinol 0.001 mg / l, which corresponds to the existing emission standards.

New design features of the claimed utility model allow both to increase the efficiency of the installation for the treatment of industrial concentrated wastewater and to help prevent the entry of volatile organic pollutants into the environment.

Claims (1)

A plant for the treatment of concentrated industrial wastewater containing volatile organic pollutants, including a unit for preparing water for biological treatment and a biological treatment unit, including bioreactors, a biomass extension unit, an air emission treatment unit, and a system of process pipelines for delivering wastewater and air, characterized in that bioreactors are cylindrical devices containing an annular partition equipped with windows for wastewater inlet and dividing the bioreactor into the fl the aeration zone and the aeration zone in which the nozzle with immobilizing material is fixed, and the biological treatment unit additionally contains a cooling, monitoring and temperature control system for the contents of the bioreactors, including temperature sensors in the aeration zone of the bioreactors, heat exchangers on the bioreactor circulation line, temperature sensors, flow meters, and control valves on the circulation line after heat exchangers.