KR101157532B1 - Device and procedure for the anaerobic treatment of sewer and low strength wastewater - Google Patents

Abstract

According to the present invention, urban sewage and low concentration wastewater are purged by using an anaerobic process, thus eliminating the need for an air disperser, thereby reducing power consumption, reducing the installation area of wastewater treatment systems, and improving urban sewage efficiency. And an anaerobic treatment system for low concentration wastewater. The present invention discloses a sedimentation tank for sedimenting and removing suspended solids contained in municipal sewage and low concentration wastewater; An anaerobic reactor for decomposing organic matter in urban sewage and low concentration wastewater from which suspended solids are removed into methane and carbon dioxide using anaerobic microorganisms; A stripper for further recovering methane dissolved in the effluent discharged from the anaerobic reactor, increasing the DO concentration of the effluent, and also reducing the biological reactivity of the effluent; A concentration tank for concentrating the sludge precipitated in the precipitation tank; And a sludge digester for heating and stirring the concentrated sludge to decompose the organic matter of the sludge into by-products and methane gas.

Description

DEVICE AND PROCEDURE FOR THE ANAEROBIC TREATMENT OF SEWER AND LOW STRENGTH WASTEWATER}

The present invention relates to a wastewater treatment system, and more particularly, to a wastewater treatment system for recovering methane from wastewater by treating municipal sewage and low concentration wastewater in an anaerobic process.

Wastewater treatment methods are known as aerobic and anaerobic processes. For the treatment of municipal sewage and low concentration wastewater, it is common to use aerobic processes called standard activated sludge methods. The standard activated sludge method is to prepare a primary sedimentation basin-aerobic tank-secondary sedimentation basin, to precipitate soil or other large suspended matter which affects pump operation in the primary sedimentation basin, and to feed the organic matter in the wastewater in the aerobic basin. After being decomposed or adsorbed through respiration and growth, the activated sludge maintained and increased in this process is precipitated by the specific gravity difference in the secondary sedimentation basin to separate solid-liquid.

1 schematically shows a typical example of a wastewater treatment system for treating municipal sewage and low concentration wastewater using an aerobic process. In the drawings, reference numerals 1 and 2 denote sedimentation tanks and primary settling tanks. Municipal sewage and wastewater pass through the sedimentation tank (1) and the primary sedimentation tank (2), and sedimentary substances (primary sludge) such as suspended solids, fine suspended solids, organic matter, and inorganic matters contained in the wastewater Precipitate is removed.

Dissolved organic substances not precipitated in the sedimentation tank 1 and the primary precipitation tank 2 are synthesized and removed as sludge (excess sludge) by the microorganisms in the aerobic reactor 3. In general, it is known that about 50% of the influent organic matter is converted into excess sludge. The excess sludge is mainly discarded microorganisms, and the supernatant is discharged from the secondary settling tank (4), and the supernatant is discharged. It is transferred to a facility, that is, a concentration tank 5, a first stage digester 6 and a two stage digester 7, and processed.

However, the aerobic treatment system for general wastewater as described above requires not only the facility cost of the blower and the diffuser used for blowing the aerobic reactor 3 in order to supply oxygen into the aerobic reactor 3 but also required for operating the blower. The disadvantage is that the power consumption is large. In Korea, it is known that about 40% of the total power consumption of sewage treatment plants is used for ventilation.

In addition, since the aerobic treatment system for general wastewater as described above should basically have a primary sedimentation tank, aerobic reaction tank, secondary sedimentation tank, sludge conveying facility, etc., it is economical in securing installation site, construction cost, and maintenance cost. Not only is it high, but there is a high possibility of adversely affecting the lives of residents in nearby areas due to the bad smell emitted along with the large amount of air used in the aerobic reactor.

On the other hand, a wastewater treatment system for treating wastewater using an anaerobic process converts organic matter contained in the wastewater into biogas, which is renewable energy, generates a relatively small amount of excess sludge, and does not require an acid device required in an aerobic method. Therefore, the energy saving effect is large, and the possibility of odorous substance emission is low since the reaction vessel is sealed. In addition, since a high pollutant load can be treated, a small volume of reaction apparatus can be used, and since a small amount of excess sludge is generated, the secondary sedimentation tank may be small or absent, thereby having an advantage of taking up a small area of the site.

The anaerobic process having the above advantages has not been used in urban sewage and low concentration wastewater treatment until recently due to the misconception that the treatment efficiency is lower than that of the aerobic process and the processing speed is slow, requiring a long residence time. Only high concentration wastewater is used.

However, the inventors have shown through experiments that some new anaerobic processes can be very effectively applied to municipal sewage and low concentration wastewater treatment and can be operated at short residence times such as aerobic processes.

The present invention has been made in view of the above, by treating the city sewage and low concentration wastewater by using an anaerobic process, the need for an diffuser is unnecessary, can reduce the power consumption, the city can reduce the waste water treatment system installation area The purpose is to provide an anaerobic treatment system for sewage and low concentration wastewater.

Another object of the present invention is to provide an anaerobic treatment system for municipal sewage and low concentration wastewater, which can recover renewable energy by treating municipal sewage and low concentration wastewater using an anaerobic process, and reduce emissions of carbon dioxide, a global warming substance. It is.

Anaerobic treatment system for municipal sewage and low concentration wastewater according to an embodiment of the present invention for achieving the above object, the sedimentation tank for sedimentation and removal of suspended solids contained in municipal sewage and low concentration wastewater; An anaerobic reactor for decomposing organic matter in urban sewage and low concentration wastewater from which suspended solids are removed into methane and carbon dioxide using anaerobic microorganisms; A stripper for further recovering methane dissolved in the effluent discharged from the anaerobic reactor, increasing the DO concentration of the effluent, and also reducing the biological reactivity of the effluent; A concentration tank for concentrating the sludge precipitated in the precipitation tank; And a sludge digester for heating and stirring the concentrated sludge to decompose the organic matter of the sludge into by-products and methane gas.

In addition, the anaerobic treatment system for municipal sewage and low concentration wastewater according to the present invention may further include a filtration unit for final filtration of the effluent discharged from the stripper, in which a fine filter or a membrane is used as the filtration unit. Can be.

In addition, the anaerobic treatment system of municipal sewage and low concentration wastewater according to the present invention may further include a nitrogen / phosphorus removal unit for removing nitrogen and phosphorus contained in the effluent discharged from the stripper.

The nitrogen / phosphorus removal unit may be removed by precipitating nitrogen and phosphorus together using MAP (MgNH ₄ PO ₄ ) precipitation method, or removing nitrogen alone using ANAMMOX (Anaerobic Ammonia Oxidation) or Sharon Process method, or MAP It may be configured to remove phosphorus using a precipitation method or a flocculation plant.

In addition, the ammonia nitrogen contained in the sewage and waste water can be removed by nitrifying the nitrogen / phosphorus removal unit as a nitrification tank and then returning it to an anaerobic reactor to promote denitrification.

In addition, the sedimentation tank may use a mechanical solids separation device such as a coagulation sedimentation tank or a centrifugal separator using a flocculant, thereby increasing the removal efficiency of the suspended solids, thereby reducing the load of the anaerobic reactor for treating soluble materials. .

In addition, the anaerobic reactor, ABR (Anaerobic Baffled Reactor), AFBR (Anaerobic Fluidized Bed Reactor), AF (Anaerobic Filter), UASB (Upflow Anaerobic Sludge Blanket), AnMBR (Anaerobic Membrane Bioreactor) or a hybrid thereof (hybrid) The reactor of choice can be used. In addition, reactors such as Anaerobic Expanded Granular Sludge Blanket Reactor, Anaerobic Internal Circulation Bioreactor, and Anaerobic Sequencing Batch Reactor (ASBR) can be used.

In addition, the stripper may have a configuration that aeration for a predetermined time by using air.

According to the present invention, since the municipal sewage and the low concentration wastewater are treated using an anaerobic reactor, an acid generator such as in an aerobic process is unnecessary, so that power consumption can be reduced.

In addition, according to the present invention, since the amount of excess sludge produced by using the anaerobic reaction tank is very small, a separate secondary sedimentation tank which occupies about 1/2 of the reaction tank area is not required in the aerobic process, and if necessary, the size of the existing sewage treatment The construction area is very small compared to the secondary sedimentation tanks in the system, which greatly reduces the use site area.

In addition, according to the present invention, it is possible to improve the energy recovery efficiency of generating methane gas, which is renewable energy from organic matter, and the generated methane gas is heated and stagnant in an anaerobic reactor and digester using power generation and waste heat using a cogeneration generator. Since it can be used as a heat source to nearby areas and used for automobile fuels, it can reduce the operating cost of sewage treatment plants and also implement sewage treatment plants that can ultimately sell energy.

That is, according to the present invention, it is possible to reduce the power consumption by eliminating the need for an acid generator such as in an aerobic process, and further, the energy required for operating the wastewater treatment system using methane gas generated during the treatment of municipal sewage and low concentration wastewater. It can replace and produce and sell energy in sewage treatment plant.

1 is a schematic diagram of an aerobic treatment system of a typical municipal sewage and low concentration wastewater;
2 is a schematic diagram of an anaerobic treatment system for municipal sewage and low concentration wastewater according to one embodiment of the present invention;
3 is a schematic diagram of an anaerobic treatment system for municipal sewage and low concentration wastewater according to another embodiment of the present invention;
4 is a schematic diagram of an anaerobic treatment system for municipal sewage and low concentration wastewater according to another embodiment of the present invention, and
FIG. 5 is a view schematically illustrating an anaerobic treatment system for municipal sewage and low concentration wastewater according to another embodiment of the present invention, in particular, a nitrogen denitrification treatment in an anaerobic reactor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, in describing the embodiments of the present invention, if it is determined that detailed descriptions of related well-known functions and configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

2 is a schematic diagram of an anaerobic treatment system for municipal sewage and low concentration wastewater according to one embodiment of the present invention.

As shown in FIG. 2, the anaerobic treatment system for municipal sewage and low concentration wastewater according to an embodiment of the present invention includes a settling tank 100, a concentration tank 200, a sludge digestion tank 300, an anaerobic reactor 400, and a stripper ( 500).

The sedimentation tank 100 removes suspended solids (SS) from the incoming urban sewage and low concentration wastewater, and is a biological oxygen demand (BOD) or chemical oxygen demand (BOD) caused by the suspended matter. ) Together to reduce post-processing load and increase processing efficiency. That is, the settling tank 100 is to remove the suspended solids by gravity precipitation through the first settling facility, the purpose of reducing the load of biological treatment process, the capacity of the post-treatment facilities and stable reduction of operating costs, etc. have.

The sedimentation tank 100 precipitates fine particulates in the sewage while the urban sewage and the low concentration wastewater flowed in for several hours. In the settling tank 100, the floating material floating on the surface is removed using a scraper.

The settling tank 100 as described above is divided into an inlet portion, a precipitate portion, a sludge storage portion, an outlet portion. In the inlet portion to disperse the force of the lower portion, in the precipitate portion to precipitate the precipitate.

At this time, the precipitate is called primary sludge, is sent to the concentration tank 200 of the sludge treatment process to be described later is subjected to the sludge treatment process, sewage treated by sedimentation tank 100 is anaerobic reaction tank (400) in the outflow portion ) To be processed through biological treatment.

Typically, in the sedimentation tank 100, while the sewage stays for about 2 to 3 hours, usually about 30% of the biological oxygen demand is removed, and the suspended solids is removed about 35%. Sedimentation efficiency depends on the type of sewage network, the duration of sewage production, and the degree of grinding before sedimentation. Such settling tank 100 is to facilitate the function of the subsequent process, it is very important in water quality management to discharge the sludge properly.

Such settling tank 100 may use a mechanical solid separator such as a flocculating settling tank or a centrifugal separator using a flocculant to reduce the load of the anaerobic reactor 400 for treating soluble substances by increasing the removal efficiency of suspended solids.

The concentration tank 200 is solid-liquid separation of the primary sludge generated and settled in the settling tank 100 to increase the concentration, to reduce the sludge volume. At this time, the sludge is concentrated by gravity precipitation method.

Since the primary sludge is an inevitable by-product of the sewage treatment process, the sewage treatment plant should reduce the sludge to a minimum, and the concentration tank 200 reduces the moisture to 97 to 992%. At this time, the sludge enrichment situation has a great influence on the overall effect of the sludge treatment plant, and the separation liquid also affects the sewage treatment plant, so sufficient management is required. Mechanical thickeners can also be used for high concentrations of primary sludge.

The sludge concentrated in the concentration tank 200 is sent to the sludge digester 300. The sludge digester 300 is a chemical treatment of the concentrated sludge, by heating and stirring the sludge in a closed tank, serves to decompose the organic matter of the sludge to generate methane gas and by-products.

The sludge digester 300 may be composed of an aerobic digester or anaerobic digester to decompose organic matter by the action of microorganisms to treat sludge. At this time, the aerobic digester has the advantage of easy operation, almost no smell, low biological oxygen demand of the treated water, low concentration of suspended solids.

In addition, the anaerobic digester does not need a power plant in the case of a small scale can be continuously processed, easy to maintain, obtain useful methane gas, there is an advantage that can kill pathogens and parasites eggs. Methane gas generated in the anaerobic digester is used as its own fuel (generator, boiler 1000) to help the recycling of resources.

The sludge digester 300 mainly uses anaerobic digestion, a method of treating sludge by blocking oxygen, thereby minimizing and stabilizing secondary pollution afterwards by reducing the content of organic matter. Typically, when decomposing organic matter under anaerobic conditions, anaerobic bacteria or microorganisms decompose organic matter in the absence of oxygen to generate methane, hydrogen sulfide, carbon dioxide, and the like as a dispersion.

Anaerobic digestion of sludge through such anaerobic digesters not only reduces sludge but also improves sludge dehydration, makes hygienic safe sludge, and the generated digestive gas has the advantage of being used as fuel.

The sludge in the sludge digester 300 is sent to a dehydration tank (not shown) to lower the water content, and then incinerate, dry and recycle, or landfill. Usually, sludge generated as a result of sewage treatment is large in volume and high in moisture, and thus liquid is almost impossible to dispose as it is. Therefore, the sludge dewatering equipment such as a pressure filter combined with filtration and compression is used to dewater the sludge with a sludge moisture content of about 80% or less to reduce the sludge capacity, thereby making it easier to carry out, transport and dispose of.

The anaerobic reactor 400 serves to decompose organic sewage in sewage into methane and carbon dioxide by using anaerobic microorganisms in sewage treated in the sedimentation tank 100.

Anaerobic Baffled Reactor (ABR), Anaerobic Fluidized Bed Reactor (AFBR), Anaerobic Filter (AF), Upflow Anaerobic Sludge Blanket (UASB), Anaerobic Membrane Bioreactor (AnMBR), Anaerobic Expanded Granular Sludge Blanket Reactor , Anaerobic Internal Circulation Bioreactor, Anaerobic Sequencing Batch Reactor (ASBR), etc. may be used, and hybrid reactors thereof may also be preferably used.

Among the various anaerobic reactors 400 mentioned above, a brief look at the AFBR reactor.

The AFBR reactor is a methane fermentation tank that maintains high concentration of microorganisms in the reactor by forming a fluidized biofilm using granular materials having a large specific surface area such as sand, mud, and activated carbon having excellent sedimentation properties. As a result, anaerobic microorganisms maintain high activity and economical operation is possible by treating not only high concentration organic wastewater but also wastewater containing low concentration organic matter in a short residence time. It is especially stable against microbial shock loads.

AFBR reactors are generally in the form of very simple reactors consisting of inlets, fluidized bed beds, and gas-flow particle separation tanks. Depending on the type of wastewater, operating conditions, and culture environment, microorganisms attached to media with a diameter of 0.2 to 0.8 mm are generally maintained at a high concentration of about 40 kg / ㎥ and a rapid upward flow rate of 10 to 30 m / h. This applies. In this system, AFBR is primarily intended for the decomposition of organics present in the treated water, but can also be used for the denitrification of nitrate nitrogen.

As the treated water is distributed evenly through the inlet and passes through the dense fluid bed, the organic matter is decomposed into methane and carbon dioxide gas through acid fermentation process. It is separated from the gas in the fluidized particle separation tank and circulated to the fluidized bed bed. In order for AFBR to function as denitrification, ammonia nitrogen present in the treated water must be nitrified in a nitrogen removal unit described later, and then returned to AFBR to proceed with denitrification.

According to the structural features and the generation of fluidized bed biofilm as described above, AFBR reactor has the following advantages and can be effectively used in municipal sewage and low concentration wastewater treatment system.

First, high volume loads can be tolerated due to the maintenance of high concentrations of microorganisms, fast upflow rates, and high mass transfer efficiency. In other words, the hydraulic residence time can be shortened to less than 10 minutes and site demand can be reduced.

Second, the device structure is simple, no artificial design such as stirring, sludge conveyance, etc. is necessary and maintenance is easy.

Third, high treatment efficiency can be obtained even in low concentration wastewater treatment or low residence time.

Finally, it is resistant to water quality and quantity. This is because when granular activated carbon is used as a media, it can act as a buffer of toxic substances during the start-up and overload period of the reactor, thereby maintaining high treatment efficiency.

When using the anaerobic reactor 400 as described above, since the amount of excess sludge is very small, a separate secondary precipitation tank is not required. Even if a separate sedimentation tank is required, the size of the sewage treatment plant construction site can be reduced because the size can be configured to be much smaller than that of the secondary sedimentation tank of the existing sewage treatment system. In addition, the generated excess sludge may be directly dewatered or transferred to the sludge digester 300 for treatment of methane.

The methane gas decomposed in the anaerobic reactor 400 is used as a fuel of a boiler or a generator 1000, and the effluent is sent to the stripper 500. As such, when the anaerobic reactor 300 is used, more methane gas may be generated as compared with the conventional aerobic reactor. That is, in the conventional sewage treatment system using an aerobic reactor, only a small amount of methane gas could be generated from the sludge digester, but if the anaerobic reactor according to the present invention is used, a large amount of methane gas can be generated from the anaerobic reactor 400. In addition, the stripper 500 to be described later can further recover methane gas, and the sludge digester 300 can recover methane gas.

The stripper 500 further recovers methane dissolved in the effluent flowing out of the anaerobic reactor 400, increases the DO concentration of the effluent, and is installed for the purpose of reducing the biological reactivity of the effluent.

The stripper 500 may use a conventional apparatus, and aeration for a short time using air. Since the air generated here contains methane, as described above, when supplied to the boiler, generator 1000 or the like, the heat amount of the recovered methane can be used as a heat source.

3 is a schematic diagram of an anaerobic treatment system for municipal sewage and low concentration wastewater according to another embodiment of the present invention.

As shown in FIG. 3, the anaerobic treatment system for municipal sewage and low concentration wastewater according to another embodiment of the present invention includes a sedimentation tank 100, a concentration tank 200, a sludge digestion tank 300, an anaerobic reactor 400, and a stripper. 500 and the filtration unit 600 is provided.

The sedimentation tank 100, the concentration tank 200, sludge digestion tank 300, anaerobic reactor 400 and stripper 500 are those of the anaerobic treatment system of municipal sewage and low concentration wastewater according to an embodiment of the present invention described above Since it has the same configuration and operation, a detailed description thereof will be omitted, and the filtration unit 600 will be described below.

The filtration unit 600 is to obtain a high quality effluent that can be reused by final filtration of the sewage treated by the stripper 500, it may be composed of a fine filter or membrane. The fine filter or membrane may be used for the same purpose as used in existing sewage treatment system.

On the other hand, Figure 4 is a schematic diagram showing the anaerobic treatment system of municipal sewage and low concentration wastewater according to another embodiment of the present invention, as shown, municipal sewage and low concentration according to another embodiment of the present invention The anaerobic treatment system of wastewater includes a sedimentation tank 100, a concentration tank 200, a sludge digestion tank 300, an anaerobic reaction tank 400, a stripper 500, a filtration unit 600, and a nitrogen / phosphorus removal unit 700. do.

The sedimentation tank 100, the concentration tank 200, sludge digestion tank 300, anaerobic reaction tank 400, stripper 500 and the filtration unit 600 of the municipal sewage and low concentration wastewater according to another embodiment of the present invention described above Since it has the same configuration and operation as those of the anaerobic treatment system, a detailed description thereof will be omitted here, and the nitrogen / phosphorus removal unit 700 will be described below.

The nitrogen / phosphorus removal unit 700 is configured to adjust the concentrations of nitrogen and phosphorus in the effluent discharged after the final treatment based on the quality of the effluent water.

Municipal sewage and low concentration wastewater contain nutrients including nitrogen and phosphorus as well as organic matter. Nutrients are inorganic elements necessary for the growth and proliferation of microorganisms causing organic decomposition, among which nitrogen compounds and phosphates are elements that must be continuously supplied for biological cell formation and energy metabolism. However, when nutrients such as nitrogen and phosphorus are increased, there is a problem that eutrophication occurs as the balance of the ecosystem is destroyed.

Nitrogen sources that cause eutrophication include domestic sewage, factory wastewater, and agricultural wastewater. Living sewage contains proteins, peptides, amino acids and urea as organic nitrogen compounds and small amounts of ammonia as inorganic nitrogen compounds. Organic nitrogen compounds, or nitrogen, are oxidized to nitrite or nitrate by the action of microorganisms in the water, consuming oxygen in the water. Nitrite or ammonia has a fatal effect on fish.

The main source of phosphorus is synthetic detergents, which account for 30-40% of phosphorus flowing into aquatic ecosystems. Phosphates are used as fillers in synthetic detergents, which together with the surfactants have a synergistic effect on the cleaning action, making up a large part of synthetic detergents. As the amount of synthetic detergents increases, the share of phosphate in sewage is increasing.

When such nitrogen or phosphorus accumulates in a reservoir or the like, eutrophication occurs. Eutrophication is a phenomenon that occurs when nitrogen or phosphorus is introduced into a reservoir or the like, and microorganisms such as algae that feed these nitrogen or phosphorus are over-proliferated. Therefore, in order to fundamentally prevent eutrophication, nutrient components in the sewage and wastewater have to be removed before they enter the water such as lakes or rivers.

In this embodiment, by further comprising a nitrogen / phosphorus removal unit 700 for removing nitrogen or phosphorus contained in the effluent water is finally decomposed organic matter in the waste water, the concentration of nitrogen and phosphorus can be adjusted based on the discharge water quality standards Make sure

The nitrogen / phosphorus removal unit 700 is first configured to precipitate and remove nitrogen and phosphorus using MAP (MgNH ₄ PO ₄ ) precipitation method, or second, ANAMMOX (Anaerobic Ammonia Oxidation), Sharon Process method, etc. Using to remove the nitrogen alone, or third, in addition to the MAP precipitation method can be configured to remove the phosphorus with a separate flocculation settling facility.

In addition, as shown in Figure 5, the ammonia nitrogen contained in the sewage and waste water is nitrified using the nitrogen / phosphorus removal unit 700 as the nitrification tank and then returned to the anaerobic reactor 400 to promote denitrification Can also be removed. In this case, since the sewage organic material is used for the denitrification of nitrate nitrogen, it is not necessary to inject an external carbon source, which is usually added for denitrification, thereby reducing the treatment cost.

To this end, in this embodiment, as shown in Figure 5, the nitrogen / phosphorus removal unit 700 and the anaerobic reaction tank 400 is connected by a conveying line (800). In addition to the conveying line 800, other configurations and actions shown in FIG. 5 are the same as the wastewater treatment system according to another embodiment of the present invention described above.

As described above, the anaerobic treatment system for municipal sewage and low concentration wastewater according to preferred embodiments of the present invention treats municipal sewage and low concentration wastewater which have been previously treated by an aerobic process using an anaerobic process. By using anaerobic process, it is possible to decompose methane gas from organic material and use it as renewable energy, and because the amount of surplus sludge is significantly reduced, it can be installed very small even if the sedimentation tank which occupies a large snow area such as the secondary sedimentation tank is removed or installed. In addition, the site area of sewage treatment plants can be reduced.

In addition, it is possible to reduce the power consumption by eliminating the need for an aerobic device in the aerobic process, and can be used to heat the reaction tank, drying the sludge using the generated methane gas, it is possible to innovatively reduce the operating cost of the sewage treatment plant. In addition, the surplus energy can be produced and sold as electricity generation, city gas, and the like.

In the above, the present invention has been described by way of example. It is to be understood that the terminology used herein is for the purpose of description and should not be regarded as limiting. Various modifications and variations of the present invention are possible in light of the above teachings. Accordingly, unless otherwise indicated, the invention may be practiced freely within the scope of the claims.

100; sedimentation tank 200; concentration tank
300; sludge digester 400; anaerobic reactor
500; stripper 600; filtration unit
700; nitrogen / phosphorus removal unit

Claims (12)

A sedimentation tank for sedimenting and removing suspended solids contained in municipal sewage and low concentration wastewater;
An anaerobic reactor for decomposing organic matter in urban sewage and low concentration wastewater from which suspended solids are removed into methane and carbon dioxide using anaerobic microorganisms;
A stripper for further recovering methane dissolved in the effluent discharged from the anaerobic reactor to increase a recovery rate of renewable energy;
A concentration tank for concentrating the sludge precipitated in the precipitation tank; And
An anaerobic treatment system for municipal sewage and low concentration wastewater, comprising: a sludge digester for heating and stirring the concentrated sludge to decompose organic matter of the sludge into by-products and methane gas. The method of claim 1,
Anaerobic treatment system for municipal sewage and low concentration wastewater, characterized in that it further comprises a filtration unit for the final filtration of the effluent discharged from the stripper. The method of claim 2, wherein the filtration unit,
Anaerobic treatment system for municipal sewage and low concentration wastewater, characterized in that it is a fine filter or membrane. The method of claim 1,
An anaerobic treatment system for municipal sewage and low concentration wastewater, further comprising a nitrogen / phosphorus removal unit for removing nitrogen and phosphorus contained in the effluent discharged from the stripper. The method of claim 4, wherein
The nitrogen / phosphorus removal unit, the anaerobic treatment system for municipal sewage and low concentration wastewater, characterized in that by removing the nitrogen and phosphorus by using the MAP (MgNH ₄ PO ₄ ) precipitation method. The method of claim 4, wherein
The nitrogen / phosphorus removal unit, the anaerobic treatment system for municipal sewage and low concentration wastewater, characterized in that to remove nitrogen using ANAMMOX (Anaerobic Ammonia Oxidation) or Sharon Process method. The method of claim 4, wherein
The nitrogen / phosphorus removal unit, the anaerobic treatment system for municipal sewage and low concentration wastewater, characterized in that to remove the phosphorus using a flocculation settling facility in addition to the MAP precipitation method. The method of claim 4, wherein
The nitrogen / phosphorus removal unit is an anaerobic treatment system for municipal sewage and low concentration wastewater, characterized by oxidizing ammonia nitrogen for nitrogen removal and returning the nitrified treated water to the anaerobic reactor to remove nitrogen by denitrification. . The said settling tank of any one of Claims 1-8,
An anaerobic treatment system for municipal sewage and low concentration wastewater, characterized by using a flocculation settling tank or a mechanical solids separator using a flocculant. The anaerobic reactor according to any one of claims 1 to 8,
Anaerobic Baffled Reactor (ABR), Anaerobic Fluidized Bed Reactor (AFBR), Anaerobic Filter (AF), Upflow Anaerobic Sludge Blanket (UASB), Anaerobic Membrane Bioreactor (AnMBR), Anaerobic Expanded Granular Sludge Blanket Reactor, Anaerobic Internal Circulation Bioreactor, ASBR Anaerobic Sequencing Batch Reactor), the anaerobic treatment system of municipal sewage and low concentration wastewater, characterized in that any one of the reaction tank (hybrid) selected from. The method according to any one of claims 1 to 8,
The stripper is aerobic treatment system for municipal sewage and low concentration wastewater, characterized in that aeration for a predetermined time using air. The method according to any one of claims 1 to 8,
The anaerobic treatment system of municipal sewage and low concentration wastewater, wherein the anaerobic reactor is operated in a continuous batch reactor mode.

Images