KR101419850B1 - Treatment system of wastewater having package type bioreactor - Google Patents

Abstract

Disclosed is a wastewater treatment system having a package-type bioreactor for wastewater treatment that can reduce installation costs and operation costs while arranging each process in a space to minimize a site and a pipeline facility required for wastewater treatment in a system for treating wastewater containing ammonia nitrogen and dissolved phosphate. The present invention is a wastewater treatment system having a package-type bioreactor for wastewater treatment that treats wastewater containing ammonia nitrogen and dissolved phosphate. The package-type bioreactor for wastewater treatment comprises: a bioreactor for introducing, through an inlet, wastewater containing ammonia nitrogen and dissolved phosphate, conducting the nitrification of the ammonia nitrogen and the phosphorus-absorbing reaction of the dissolved phosphate via the action of aerobic microbes, and discharging treated water through an outlet; an air diffuser for raising air, which is introduced from outside the reactor for wastewater treatment, from the lower part of the bioreactor; a fixed bio-carrier placed inside the bioreactor and above the air diffuser and having aerobic microbes attached to the surface thereof; and a microbe-concentrating device placed inside the bioreactor and including a membrane module inside to discharge the treated water that has passed the membrane module.

Description

Technical Field [0001] The present invention relates to a wastewater treatment system having a packaged wastewater treatment reactor,

The present invention relates to a wastewater treatment system, and more particularly to a treatment system for wastewater containing ammonia nitrogen and dissolved phosphates.

Organic matter and nutrients such as nitrogen and phosphorus are the main pollutants in various wastewater. Conventional biological nitrogen and phosphorus removal processes consist of three or more separate reaction vessels, such as an aerobic reactor for nitrification and excess phosphorus, an anaerobic reactor for denitrification, and an anaerobic reactor for phosphorus release. When nitrogen and phosphorus are to be removed from a single reaction tank, the intermittent aeration method in which nitrification and denitrification are alternately repeated at a time interval is used.

Particularly, in order to introduce an advanced treatment facility to enhance the nitrogen and phosphorus removal efficiency in the wastewater treatment facility that has already been constructed by the activated sludge process and is in operation, it is necessary to change to the denitrification process, the post- denitrification process or the intermittent aeration process, Should be installed. As a result, it is difficult to remodel or add mechanical devices and civil engineering structures.

Most biological nitrogen and phosphorus removal processes are based on the A2O process. However, even in the case of the A2O process, since the sedimentation tank is used as the last step for producing the final treated water, the problem of deterioration of the treated water due to sedimentation of the activated sludge is inherent.

In order to prevent deterioration of treated water quality due to sedimentation of activated sludge, a membrane filtration process for separating microorganisms and treated water has been introduced since the 1980s. The separator can completely eliminate the passage of the particulate material having a pore size larger than the pore size. When the membrane filtration process is introduced into the wastewater treatment process due to these characteristics, the particulate matter can be completely removed without regard to sedimentation of the activated sludge, thereby ensuring stable treatment at all times. Also, since the outflow of activated sludge from the microbial reaction tank can be completely eliminated and the concentration of the activated sludge can be easily controlled, it is possible to maintain a high microbial concentration in the reaction tank. Maintaining a high microbial concentration in the biological treatment process means maintaining a large number of active microbial concentrations per unit volume, which enables the treatment of larger amounts of wastewater through smaller sites. In addition, it enables stable treatment for high organic load. Such a process is commonly referred to as a MBR (Membrane Bio-Reactor) process.

However, the MBR process has limitations in processability due to its ability to maintain a high concentration of microorganisms in the reactor. The high concentration of activated sludge entering the membrane filtration tank accumulates on the membrane surface, causing fouling problems. Such separation membrane fouling plays a role of increasing the filtration pressure by accumulating contaminants or activated sludge in the membrane surface or membrane pores, and the increase of the filtration pressure necessitates physical and chemical cleaning to reduce the production efficiency of the treated water and to remove it .

On the other hand, in the case of the membrane filtration process as in the conventional wastewater treatment method, the treatment tank is composed of various treatment tanks for treating various organic or inorganic pollutants, and these treatment tanks are spatially separated from each other, There is a problem in that excessive operation cost is required for the facility cost and energy use due to the increase in the amount of the pump for transferring treated water or sludge.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a system for treating wastewater containing ammonia nitrogen and dissolved phosphate, To provide a wastewater treatment system having a packaged wastewater treatment reactor capable of reducing facility cost and operating cost.

It is another object of the present invention to provide a wastewater treatment system equipped with a packaged wastewater treatment reactor capable of improving the aerobic microorganism retention rate in the reactor, improving the stability of biological wastewater treatment and reducing the generation of waste sludge.

In order to solve the above-mentioned problems, the present invention provides a wastewater treatment system having a packaged wastewater treatment reactor for treating wastewater containing ammonia nitrogen and dissolved phosphate, wherein the packaged wastewater treatment reactor is characterized in that the ammonia nitrogen and dissolved A bioreactor in which phosphorus-containing wastewater flows in through an inlet, nitrification of the ammonia nitrogen by the action of aerobic microorganisms and phosphorus absorption of the dissolved phosphate are performed, and effluent flows out through an outlet; Aeration unit for raising the air introduced from the outside of the wastewater treatment reactor in the lower part of the bioreactor; A stationary phase microorganism carrier disposed inside the bioreactor and above the aerosol generator and having the aerobic microorganisms adhered to the surface thereof; And a microbial concentration device disposed inside the bioreactor and having a membrane module therein to discharge the treated water having passed through the membrane module. do.

The present invention also provides a wastewater treatment system having a packaged wastewater treatment reactor, wherein the microorganism carrier is provided with a porous cover at the top.

Also, the present invention provides a wastewater treatment system having a packaged wastewater treatment reactor, wherein the membrane module is composed of a microfiltration membrane.

The present invention also provides a wastewater treatment system having a packaged wastewater treatment reactor, wherein the microfiltration membrane is made of a ceramic material.

Also, the microorganism concentration apparatus is located above the microorganism carrier, and is separated from the microorganism carrier, and provides a wastewater treatment system including the packaged wastewater treatment reactor.

Also, the present invention provides a wastewater treatment system including a packaged wastewater treatment reactor, wherein the microorganism carrier and the microorganism concentration apparatus are disposed in parallel, and partition walls are formed between the microorganism carrier and the microorganism concentration apparatus.

According to the present invention, in a system for treating ammonia nitrogen and dissolved phosphate-containing wastewater, nitrification of ammonia nitrogen and phosphorus absorption reaction of dissolved phosphate are carried out, a fixed bed microorganism carrier and a microorganism concentration apparatus, It is possible to provide a wastewater treatment system equipped with a package type wastewater treatment reactor which can minimize the site required for wastewater treatment and reduce the facility cost and the operation cost by providing a diffuser at the bottom of the reactor.

Also, a microbial concentration device having a membrane module at a position spaced apart from the microbial carrier is provided in the lower part of the packaged wastewater treatment reactor to improve the retention rate of microbes and increase the gas / liquid contact area of the microbial carrier The present invention can provide a wastewater treatment system having a packaged wastewater treatment reactor capable of improving the stability of biological wastewater treatment and inducing the property of microorganisms from the stationary phase microorganism carrier to reduce the generation of waste sludge.

1 is a schematic view illustrating a wastewater treatment system having a packaged wastewater treatment reactor according to a first embodiment of the present invention,
2 is a schematic diagram illustrating a wastewater treatment system having a packaged wastewater treatment reactor according to a second embodiment of the present invention.
FIG. 3 is a graph showing the ammonia nitrogen (NH ₃ -N) concentration reducing effect through nitrification of a wastewater treatment system having a packaged wastewater treatment reactor according to the present invention,
FIG. 4 is a graph showing a reduction effect of total nitrogen (TN) concentration in wastewater through denitrification oxidation induction after nitrification of a wastewater treatment system having a packaged wastewater treatment reactor according to the present invention,
FIG. 5 is a graph showing a reduction effect of total phosphorus (TP) concentration in wastewater by phosphorus ingestion of a wastewater treatment system having a packaged wastewater treatment reactor according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In order to clearly illustrate the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification. Also, throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

First Embodiment

1 is a schematic diagram illustrating a wastewater treatment system having a packaged wastewater treatment reactor according to a first embodiment of the present invention.

Referring to FIG. 1, a wastewater treatment system 100 having a packaged wastewater treatment reactor according to a first embodiment of the present invention includes a packaged wastewater treatment reactor 101 for treating wastewater containing ammonia nitrogen and dissolved phosphate Wherein the wastewater (W) containing ammonia nitrogen and dissolved phosphate is introduced into the packed wastewater treatment reactor (101) through the inlet (111), so that the action of aerobic microorganisms The nitrification of the ammonia nitrogen and the phosphorus absorption reaction of the dissolved phosphate are carried out by the biological treatment tank 110 and the biological treatment tank 110 through which the treated water flows out through the outflow port 112; A diffuser (120) for raising the air introduced from the outside of the wastewater treatment reactor (101) in the lower part of the bioreactor (110); A stationary phase microorganism carrier (130) located inside the bioreactor (110) and above the air diffuser (120) and attached to the surface of the aerobic microorganism; And a microbial concentration device 140 located inside the bioreactor 110 and having a membrane module therein to drain the treated water that has passed through the membrane module.

In the wastewater treatment system 100 according to the present invention, raw water is wastewater W containing ammonia nitrogen and dissolved phosphate as WTBT and is continuously introduced into the bioreactor through a raw water pipe by a pump P1 .

The raw water W may include organic substances other than ammonia nitrogen and dissolved phosphate, organic nitrogen and phosphorus. Therefore, the wastewater flowing into the bioreactor 110 has relatively abundant organic matter, nitrogen compounds, and nutrients such as phosphorus, which are to be removed, and oxygen that is artificially supplied for the aerobic decomposition and nitrification and phosphorus absorption of the organic matter is dissolved Together. On the other hand, in the case of a nitrogen compound, wastewater containing ammonia nitrogen, organic nitrogen, organic matter, etc., such as sewage, manure, onion digestion decant, factory wastewater and landfill leachate is often treated as an object of treatment. Or an anaerobic treatment to decompose the organic matter and decompose the organic nitrogen into ammonia nitrogen may be used as the raw water. In the case of the dissolved phosphate, the raw water may be a solution in which dissolved organic matter is absorbed by allowing the process inflow water to pass through the general anaerobic reaction tank before entering the bioreactor 110.

The stationary phase microorganism carrier 130 is located at the lower end of the inside of the bioreactor 110. When the stationary phase microorganism carrier 130 is installed in an aerobic reaction tank for treating wastewater and the microorganism is proliferated, The microorganisms separated from the biofilm and the microorganisms suspended from the beginning together form the suspended microorganism group and the biofilm is adhered to the immobilized microorganism carrier 130 together with the biofilm, Thereby forming a proliferation form. The microorganism may be a bacterium using an inorganic carbon source such as carbon dioxide or carbonate, and is not particularly limited as long as it is a bacterium capable of absorbing nitrification and dissolved phosphate of ammonia nitrogen. Examples thereof include Nitrosomonas, It may be a Nitrobactor.

The thickness of the biofilm that is attached to the aerobic microorganism carrier 130 is about 1 to 2 mm, and the layer of about 0.1 to 0.2 mm formed on the epidermis is aerobic and decomposes organic matter together with nitrogen oxides (NO ₂ -N, NO < ₃ > -N). Thereafter, the process effluent discharged from the bioreactor 110 may be introduced into the general anaerobic reactor to perform denitrification. In addition, the biological elimination allows the phosphorus-excess microorganism to be ultimately removed by discarding the excess sludge, that is, the phosphorus-phosphorus form, and at this time inducing the microbial capitalization from the fixed microbial carrier, .

On the other hand, only a microorganism carrier having a specific gravity of 1 or less can be selectively used on the microorganism carrier 130 with a porous cover.

Since the biological reaction tank 110 for treating wastewater is operated under a condition that the organic substance concentration is higher than the dissolved oxygen concentration, the dissolved oxygen required for maintaining the aerobic condition may be deficient, and the microorganisms may aggregate in the biological reaction tank 110 A phenomenon may occur in which the reactivity is lowered due to the decrease in the contact area with the substrate due to immersion.

Therefore, the air diffuser 120 is installed in the lower portion of the biological reaction tank 110 to lift oxygen from the air supply device 150 connected to the outside of the biological reaction tank 110 to the upper part of the biological reaction tank 110, So as to maximize the contact area of the microorganism with the substrate by increasing the gas / liquid contact area by inducing the dispersion of the biomass including microorganisms and preventing the microorganism aggregation and improving the contact opportunity of dissolved organic / inorganic substances in oxygen and wastewater Thereby improving the efficiency of nitrogen and phosphorus removal, and it is possible to reduce the power ratio by eliminating the need for additional equipment such as mechanical stirring.

The microbial concentration apparatus 140 is located inside the bioreactor 110 and above the microorganism carrier 130 and has a membrane module therein so that the treated water passing through the membrane module flows out through the pump P2. At this time, the membrane module prevents leakage of suspended solids in the process water, so that biological treatment and physical filtration can be performed at the same time while preventing the loss of microorganisms, thereby maintaining the concentration of microorganisms in the waste water treatment reactor 101 at a high concentration. Therefore, in order to prevent the loss of microorganisms, stability and process efficiency deterioration due to damage to the membrane due to pore-forming biological carriers, which may occur in the prior art in which a separation membrane is combined in a bioreactor including a suspended organic carrier, .

It is preferable that a microfiltration membrane is used in the membrane module in order to significantly prevent the outflow of microorganisms through the effluent. In this case, the material of the membrane module is not particularly limited, such as a polymer organic material such as polyethylene or polypropylene, or an inorganic material such as ceramic or metal. However, in order to prevent membrane contamination due to irreversible bio- For example, it is preferable to use a membrane module made of a ceramic material. The membrane module may be formed in various shapes such as a hollow fiber membrane, a tubular membrane, and a flat membrane, and may be installed in the form of a hollow fiber membrane. In addition, various methods such as a dead end filtration method, a cross flow filtration method, an immersion membrane method, and a dynamic filtration method can be applied to the separation method by the membrane module, It is desirable that the cross flow method be applied in consideration of this.

Second Embodiment

2 is a schematic diagram illustrating a wastewater treatment system having a packaged wastewater treatment reactor according to a second embodiment of the present invention.

Referring to FIG. 2, a wastewater treatment system 200 having a packaged wastewater treatment reactor according to a second embodiment of the present invention includes packaged wastewater treatment (treatment) for treating wastewater W containing ammonia nitrogen and dissolved phosphate The wastewater treatment system 200 having the reactor 201 is characterized in that the wastewater W containing the ammonia nitrogen and the dissolved phosphate flows into the packaged wastewater treatment reactor 201 through the inlet 211, A bioreactor 210 in which ammonia nitrogen is nitrified by the action of microorganisms and a phosphorus absorption reaction of the dissolved phosphate is performed and effluent flows out through an outlet 212; A diffuser (220) for raising the air introduced from the outside of the wastewater treatment reactor (201) under the bioreactor (210); A stationary phase microorganism carrier (230) located inside the bioreactor (210) and above the air diffuser (220) and attached to the surface of the aerobic microorganism; And a microbial concentration device (240) located inside the bioreactor (210) and having a membrane module therein to drain the treated water passing through the membrane module, wherein the microbial carrier (230) and the microbial concentration The device 240 is located in parallel and a partition wall 260 is formed between the microorganism carrier 230 and the microorganism concentration device 240. Hereinafter, a configuration different from the first embodiment will be mainly described.

The wastewater treatment system 200 according to the second embodiment of the present invention is different from the first embodiment in that the microorganism carrier 230 and the microorganism concentration apparatus 240 are located in parallel and the microorganism carrier 230 and the microorganism concentration apparatus 240 The partition wall 260 is formed between the fixed microbial support 230 and the fixed microbial support 230 to provide raw water W or a passage for the treated water so that the raw water W flowing through the inlet 211 is dissolved in oxygen and wastewater It is possible to further improve the contact efficiency of the organic / inorganic substance and to allow the treatment water discharge through the microorganism concentration apparatus 240 to be carried out more smoothly.

2, the first partition 261 formed between the microbial supports 230 is installed to be spaced apart from the bottom surface of the biological reactor 210, and the second partition wall 261 formed on the side of the microbial concentrator 240, The raw water W is passed twice through the microorganism carrier 230 and the treated water passes through the second partition wall 262 and the microorganism concentration device And the third partition wall 263 spaced from the bottom surface of the biological reaction tank 210 between the first and second biofilm units 240 and 240. The microfluidized water is filtered from the microbial concentration unit 240, do.

Test Example  One

In order to understand the effect of ammonia nitrogen (NH ₃ -N) concentration reduction through nitrification of a wastewater treatment system having a packaged wastewater treatment reactor according to the present invention, And the nitrification rate in the water treatment after the operation was measured and compared, and the results are shown in FIG. The influent water quality was COD cr 147 ± 32 mg / l and NH ₃ -N 36 ± 6 mg / l.

Test Example  2

In order to understand the effect of reducing the total nitrogen (TN) concentration in the wastewater by inducing denitrification following nitrification of the wastewater treatment system having the packaged wastewater treatment reactor according to the present invention, the introduction of the packaged wastewater treatment reactor of Example 2 The total nitrogen removal rate was measured and compared with that of the previous (operation with a general floating growth bioreactor) and after water treatment, and the results are shown in FIG. The influent water quality was COD cr 147 ± 32 mg / ℓ and TN 44 ± 8 mg / ℓ, and denitrification was carried out using a general anaerobic tank.

Test Example  3

In order to understand the effect of decreasing total phosphorus (TP) concentration in the wastewater by phosphorus ingestion of the wastewater treatment system having the packaged wastewater treatment reactor according to the present invention, before the introduction of the packaged wastewater treatment reactor of Example 2 The results are shown in FIG. 5. The results are shown in FIG. Inflow water quality was COD cr 147 ± 32 mg / ℓ and TN 4.5 ± 1.1 mg / ℓ, and it was carried out through the absorption process of dissolved organic matter through a general anaerobic reactor before entering the packaged wastewater treatment reactor.

3 and 4, the wastewater treatment system equipped with the packaged wastewater treatment reactor according to the present invention significantly reduces the ammonia nitrogen concentration in the wastewater compared to the case of operating the general floating growth bioreactor through high efficiency nitrification And the denitrification oxidation resulting from the highly efficient nitrification is induced, so that the total nitrogen concentration in the wastewater is remarkably reduced.

In addition, referring to FIG. 5, in the wastewater treatment system having the packaged wastewater treatment reactor according to the present invention, the total phosphorus concentration in the wastewater can be remarkably enhanced by the phosphorus ingestion by the microorganism carrier, .

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

100, 200: wastewater treatment system 101, 201: packaged wastewater treatment reactor
110, 210: Bioreactor 111, 211: Inlet
112, 212: outlet 120, 220: diffuser
130, 230: stationary phase microorganism carrier 140, 240: microorganism concentration apparatus
150, 250: Air supply device 260:
W: Wastewater (raw water) P1: Wastewater (raw water) Pump
P2: treated water pump

Claims (6)

1. A wastewater treatment system comprising a packaged wastewater treatment reactor for treating wastewater containing ammonia nitrogen and dissolved phosphate, said packaged wastewater treatment reactor comprising:
The ammonia nitrogen and dissolved phosphate-containing wastewater is introduced through an inlet, nitrification of the ammonia nitrogen and phosphorus absorption reaction of the dissolved phosphate are performed by the action of aerobic microorganisms, and a bioreactor ;
Aeration unit for raising the air introduced from the outside of the wastewater treatment reactor in the lower part of the bioreactor;
A stationary phase microorganism carrier which is located in the bioreactor and in the upper part of the anaerobic apparatus and has the aerobic microorganism Nitrosomonas or Nitrobactor attached to its surface; And
A microbial concentration device disposed inside the bioreactor and having a membrane module therein to drain the treated water having passed through the membrane module;
, ≪ / RTI &
Wherein the microbial carrier has a porous cover at its upper portion so that only a microbial carrier having a specific gravity of 1 or less can be selectively used, the thickness of the biofilm to be adhered to the microbial carrier is 1 to 2 mm, Mm is an aerobic condition in which organic matter decomposition and ammonia nitrogen nitrification are performed,
The membrane module is composed of a microfiltration membrane made of a ceramic material, a cross flow filtration method is applied,
Wherein the microbial carrier and the microbial concentrator are disposed in parallel with each other, wherein a first partition is provided between the microbial supports and the bottom of the bioreactor, and the microbial carrier is attached to the bottom of the bioreactor from the microbial carrier to the microbial concentrator And a third partition is provided between the second partition and the microbial concentration apparatus so as to be separated from the bottom of the bioreactor so that the introduced wastewater is allowed to pass through the microbial support twice And a pathway to the microbial concentrator of the treated water that has been treated through the microbial carrier is provided.
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