KR20160132707A - Diffuser for disposal plant for purifying sewage or waste water, and manfacturing method therefor - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus and, more particularly, to a diffuser of a wastewater treatment apparatus for purifying sewage or wastewater using bubbles, and to a manufacturing method thereof. According to the present invention, the wastewater treatment apparatus which floats particles using microbubbles comprises a diffuser, and the diffuser forms microbubbles having a diameter distribution in which at least 90% of the diameter falls in a 100-200 m range. The diffuser of a wastewater treatment apparatus is manufactured by mixing water with a mixture including SiO_2, Al_2O, starch, and the remaining consisting of unavoidable impurities, molding the mixture, and sintering the resultant product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dewatering plant for purifying sewage,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus for purifying wastewater or wastewater by using bubbles in sewage or wastewater, and a manufacturing method thereof.

In biological sewage treatment processes that remove organic matter, nitrogen, phosphorus, etc. from sewage, microorganism aggregates, called activated sludge, are the most important biological solids.

The operation efficiency of the activated sludge process (activated sludge process) using the activated sludge depends on the concentration load and the flow load of contaminants including the organic matter of the inflow sewage, the activated sludge concentration and condition of the reaction tank, the hydraulic retention time and the solids retention time It is greatly affected.

In particular, the concentration of activated sludge has been recognized as an important driving factor in sewage elevation treatment processes including nitrogen and phosphorus removal as well as typical activated sludge processes.

However, gravity sedimentation, which is the most commonly used solid-liquid separation method, can not properly control the concentration of activated sludge in the reaction tank or maintain it at a high concentration.

Particularly, the problem of sludge re-uptake due to nitrogen gas generated by intermittent sludge bulking or denitrification during sedimentation process, decrease of efficiency of solid-liquid separation and excessive loss of activated sludge is the most problematic in gravity settling It is pointed out as a difficult problem.

Up to now, methods developed for the operation of high concentration activated sludge process include activated sludge process (Membrane Bioreactor, MBR) using a submerged membrane, pure oxygen aeration process, and biofilter method using a carrier which is a typical adhesion growth method.

When the microorganisms are maintained at a high concentration in the activated sludge process, the organic matter load rate per unit volume can be increased by increasing the organic matter treatment capacity in the aeration tank, so that the volume of the reaction tank can be reduced to 50 to 75% Is greatly reduced.

In addition, it is expected that the nitrification rate will be drastically improved as the concentration of nitrifying microorganisms increases, so that the removal efficiency of ammonia nitrogen can be maximized.

In addition, the food-to-microorganism ratio is low and the self-oxidation of the sludge is actively promoted, thereby reducing the amount of excess sludge generated.

However, in the case of the MBR process or the biofilter process, the initial cost due to the purchase of the membrane or the carrier is very large, and the long-term operation causes clogging by the activated sludge or the sludge discharge, thereby increasing the pressure loss.

Therefore, periodic washing or backwashing must be accompanied.

In the aeration method using pure oxygen, stable operation can not be performed because it is necessary to always maintain very good sludge settling property in order to maintain a high concentration of activated sludge, and it is difficult to maintain the microorganism concentration in the aeration tank at more than 8,000 mg / L It is known.

In addition, there is a disadvantage that additional costs are required to supply pure oxygen.

In addition to these methods, it is also possible to use a continuous batch process in which a unit process of filling, reaction, settlement, draw and idle of sewage or the like is continuously performed in accordance with an arrangement of a predetermined time, A sequencing batch reactor (SBR) process has been developed and applied to wastewater treatment.

Since each unit process is performed in a single reaction tank, this method is very advantageous in terms of stable management of sewage and the like because it is not only unnecessary for a secondary settler but also is easy to control molds and is easy to construct.

However, this typical or modified form of the SBR process can not keep the mixed liquor suspended solids (MLSS) concentration high to the desired level, but also requires a long time for the precipitation reaction, which is almost indispensable, The cycle time is increased.

In addition, the existing SBR process has disadvantages in that when the water flow characteristics in the reactor are changed in the process of discharging the treated water, the sludge particles may be contained in the effluent and may be lost.

In order to shorten the time required for securing the concentration of microorganisms in the reaction tank and the time required for the precipitation reaction, a floating separation method can be used. Dissolved air flotation (DAF) is widely used as a prior art.

However, the dissolved air flotation method requires a high pressure of 4 to 5 atmospheres to supply dissolved air and requires a large-capacity compression device to secure the air amount. There are disadvantages.

In order to overcome these disadvantages, air flotation (AF), which is a recently used method, is used to generate fine bubbles artificially generated by a ceramic membrane engine instead of generating air bubbles by using pressurized and overdissolved dissolved air And the high-concentration sludge separated by solid-liquid separation is conveyed and removed by a skimmer or the like.

Meanwhile, as shown in FIG. 1, the wastewater treatment apparatus according to the air floating method performs a precipitation process, performs at least one aeration process for increasing the amount of dissolved oxygen using bubbles, The flotation process in which the sludge or the like is floated and removed can be sequentially performed.

Here, the aeration process and the flotation process are performed through the air diffusing pipe formed with pores.

However, in the conventional wastewater treatment apparatus by the air floating method, it is difficult to manufacture an air diffuser suitable for performing an aeration process and a float process, and thus there is a problem that a wastewater treatment method by the air floating method is commercialized.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air diffusing apparatus for a wastewater treatment apparatus capable of forming micro bubbles for floatation capable of providing an optimum float effect and a method of manufacturing the same.

The present invention has been made in order to achieve the above-mentioned object of the present invention, and it is an object of the present invention to provide a wastewater treatment apparatus for floating particles using fine bubbles, Discloses an acid furnace of a wastewater treatment apparatus manufactured by mixing and kneading a mixture containing SiO ₂ , Al ₂ O, starch, and unavoidable impurities as the remainder as water as bubbles to form air bubbles, and molding and firing .

The air diffusing pipe has a length of 100 cm to 200 cm, and air can be injected at an air pressure of 0.25 MPa to 0.4 MPa.

The fine bubbles preferably have an average diameter of 140 mu m to 170 mu m.

The mixture may comprise at least one of Fe ₂ O ₃ , CaO, MgO, an Extegel, and PEO.

Wherein the mixture comprises 30 wt% to 45 wt% SiO ₂ , 40 wt% to 60 wt% Al ₂ O, 0.5 wt% to 1.5 wt% Fe ₂ O ₃ , 0.1 wt% to 0.6 wt% , CaO, 0.05 wt% to 0.3 wt% MgO, 1.0 wt% to 1.7 wt% actigel, 0.1 wt% to 0.8 wt% PEO, 5 wt% to 15 wt% starch, and the remainder as unavoidable impurities .

The mixture may be formed by extrusion molding after kneading, followed by drying and firing.

The firing of the molded body may be performed at a temperature of 1,000 ° C to 1,500 ° C.

The present invention also relates to a wastewater treatment apparatus for floating particles using fine bubbles, the apparatus comprising: an oxygen tube for forming fine bubbles having a diameter distribution of 100 to 200 μm at 90% or more, the apparatus comprising SiO ₂ , Al ₂ O, And a mixture containing inevitable impurities as a remainder is mixed with water and kneaded, followed by molding and firing, thereby producing an acid furnace of the wastewater treatment apparatus.

The acid furnace of the wastewater treatment apparatus according to the present invention and the method of manufacturing the same provide a composition of a mixture for forming an acid furnace that forms the micro bubbles for floating to form micro bubbles capable of imparting optimum float effect There is an advantage to be able to.

1 is a block diagram showing an example of a process of a wastewater treatment apparatus by an air floating method.
2 is a conceptual diagram showing a part of a wastewater treatment apparatus according to the present invention.
Fig. 3 is a perspective view showing an embodiment of an air diffusing pipe in Fig. 1. Fig.
Fig. 4 is a graph showing the distribution of the diameters of the minute bubbles formed by the air diffuser formed by the composition of the conditions according to the present invention as the diffuser of Fig. 1;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an air diffuser of a wastewater treatment apparatus and a method of manufacturing the same according to the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the aeration tube 2 of the wastewater treatment apparatus according to the present invention is installed at the bottom portion of the septic tank 1 containing sewage or wastewater, and is used to float the precipitated particles and the like .

Here, the wastewater treatment apparatus forms micro-bubbles in the bottom portion of the septic tank 1 containing the sewage or wastewater, that is, the micro-bubbles are used to float the impurities such as particles contained in the sewage or the wastewater to purify the sewage or the wastewater Device.

The air diffuser 2 is connected to a main pipe 3 connected to an air supply device such as an air pump and is connected to a pipe having a predetermined length so as to form minute bubbles in the bottom portion of the septic tank 1 containing sewage or wastewater. Shape.

Specifically, the air diffuser 2 has a length of 100 cm to 200 cm, and air can be injected at an air pressure of 0.25 MPa to 0.4 MPa.

Here, the air diffusing pipe 2 may be constituted by a hollow cylinder whose one end is connected to the main pipe 3 and the other end is closed.

In addition, the air diffusers 2 may be disposed parallel to each other on both sides of the main pipe 3.

On the other hand, according to the experiment, the air diffusing pipe (2) forms fine bubbles having a diameter distribution of 100 μm to 200 μm, preferably 110 μm to 150 μm at 90% or more under the condition of air pressure of 0.25 MPa to 0.4 MPa The effect of the particles was found to be the best.

Particularly, the fine bubbles preferably have an average diameter of 130 탆 to 170 탆.

Therefore, it is preferable that the air diffusing pipe (2) is manufactured so as to form fine bubbles having a diameter distribution of 100 mu m to 200 mu m and at least 90% under the condition of air pressure of 0.25 MPa to 0.4 MPa.

The inventor of the present application proposed the composition and firing conditions of the mixture for forming the aeration tube 2, and the aeration tube 2 formed micro bubbles having a diameter distribution of 100 to 200 μm at 90% It is preferable that a mixture containing SiO ₂ , Al ₂ O, starch, and unavoidable impurities as the remainder is mixed with water and kneaded and then molded and fired as the diffuser.

Specifically, as the manufacturing process, the air diffuser 2 is formed by mixing SiO ₂ , Al ₂ O, starch, and unavoidable impurities as the remainder to form a mixture, and adding water to the mixture through a mixing process A kneading process for kneading, a molding process for molding the acid pipe 2 with a diameter and length preliminarily designed after the kneading process, a drying process for drying the molded product after the molding process, and a drying process for heating the molded product to a predetermined temperature And can be produced through a sintering process.

The mixing process and the kneading process may be combined with each other depending on the time of water injection, and the amount of water to be introduced may be selected in an appropriate amount in consideration of molding conditions.

The molding process is preferably a process of molding the air diffuser 2 with a diameter and a length previously designed after the kneading process, and it is preferable that the inside is extruded in consideration of having an empty hollow cylinder structure.

The firing process may be performed by heating the formed product after drying and drying at a temperature of 1,000 ° C to 1,500 ° C and firing the product in various processes.

On the other hand, the diameter of the fine bubbles formed in accordance with the adjustment of the mixture is determined in the above-mentioned air diffusing pipe ₂ , and the diameter of the fine bubbles formed by mixing the fine bubbles with one or more of Fe ₂ O ₃ , CaO, MgO, Is more preferable.

Here, Actigel is a product of Active Minerals (homepage http://activeminerals.com/), which is defined as hydrous magnesium aluminum-silicate.

The composition of the mixture needs to be optimized in order to form fine bubbles having a diameter distribution of 100 to 200% at 90% or more under the condition of air pressure of 0.25 MPa to 0.4 MPa .

Accordingly, the mixture contains 30 wt% to 45 wt% of SiO ₂ , 40 wt% to 60 wt% of Al ₂ O, 0.5 wt% to 1.5 wt% of Fe ₂ O ₃ , 0.1 wt% to 0.6 wt% % Of CaO, 0.05wt% to 0.3wt% of MgO, 1.0wt% to 1.7wt% of active gel, 0.1wt% to 0.8wt% of PEO, 5wt% to 15wt% of starch and the remainder as unavoidable impurities .

- Example

The composition of the mixture was changed to 37 wt% SiO ₂ , 50.4 wt% Al ₂ O, 1.5 wt% Fe ₂ O ₃ , 0.6 wt% CaO, 0.3 wt% MgO, 1.4 wt% Of PEO, 8.2 wt% of starch, and the remainder as unavoidable impurities.

Then, water was added to the mixture, kneaded, extruded, dried and calcined.

The air diffusing tube 2 after firing was formed to have a hollow inner diameter (D ₂ ) of 2 cm, an outer diameter (D ₁ ) of 4 cm, and a length of 120 cm.

Air was injected into the air diffuser 2 at a pressure of 3 MPa, and fine bubbles formed in the purification tank were measured. As a result, it was confirmed that fine bubbles were formed under the conditions shown in FIG.

4, it can be seen that the fine bubbles formed by the air diffuser 2 have a diameter distribution ranging from 100 μm to 200 μm at 90% or more.

Thus, in the case of forming the air diffuser 2 under the conditions of the above mixture, the fine bubbles become 90% or more at a diameter distribution of 100 mu m to 200 mu m, and the fine bubbles Can be formed.

That is, according to the experiment of the present invention, it can be seen that the microbubbles have a diameter distribution of at least 90% at a range of 100 μm to 200 μm and are realized by the composition conditions described above in forming minute bubbles capable of maximizing the floatation effect have.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

2:

Claims (14)

A wastewater treatment apparatus for floating particles using fine bubbles, comprising:
An air diffusing tube for forming minute bubbles having a diameter distribution of 100 to 200 占 퐉 of 90%
SiO ₂ , Al ₂ O, starch, and a mixture containing unavoidable impurities as the remainder are mixed with water, kneaded, and then molded and fired. The method according to claim 1,
Wherein said mixture comprises at least one of Fe ₂ O ₃ , CaO, MgO, an Extegel, and PEO. The method according to claim 1,
Wherein the mixture comprises 30 wt% to 45 wt% SiO ₂ , 40 wt% to 60 wt% Al ₂ O, 0.5 wt% to 1.5 wt% Fe ₂ O ₃ , 0.1 wt% to 0.6 wt% Wherein the composition contains CaO, 0.05 wt% to 0.3 wt% of MgO, 1.0 wt% to 1.7 wt% of excipient, and 0.1 wt% to 0.8 wt% of PEO, 5 wt% to 15 wt% of starch, Wherein the pipe is a pipe. The method according to any one of claims 1 to 3,
Wherein the mixture is formed as a compact by extrusion molding after kneading the mixture, followed by drying and firing. The method according to any one of claims 1 to 3,
Wherein the firing of the molded body is performed at a temperature of 1,000 ° C to 1,500 ° C. The method according to any one of claims 1 to 3,
Wherein the air diffuser has a length of 100 cm to 200 cm and air is injected at an air pressure of 0.25 MPa to 0.4 MPa. The method of claim 6,
Wherein the fine bubbles have an average diameter of 140 mu m to 170 mu m. A wastewater treatment apparatus for floating particles using fine bubbles, comprising:
An air diffusing tube for forming minute bubbles having a diameter distribution of 100 to 200 占 퐉 of 90%
Wherein a mixture containing SiO ₂ , Al ₂ O, starch, and inevitable impurities as the remainder is mixed with water and kneaded, followed by molding and firing. The method of claim 8,
Wherein the mixture comprises at least one of Fe ₂ O ₃ , CaO, MgO, an Extegel, and PEO. The method of claim 8,
Wherein the mixture comprises 30 wt% to 45 wt% SiO ₂ , 40 wt% to 60 wt% Al ₂ O, 0.5 wt% to 1.5 wt% Fe ₂ O ₃ , 0.1 wt% to 0.6 wt% Wherein the composition contains CaO, 0.05 wt% to 0.3 wt% of MgO, 1.0 wt% to 1.7 wt% of excipient, and 0.1 wt% to 0.8 wt% of PEO, 5 wt% to 15 wt% of starch, Wherein the method comprises the steps of: The method according to any one of claims 8 to 10,
Wherein the mixture is formed as a formed body by extrusion molding after kneading the mixture, followed by drying and firing. The method according to any one of claims 8 to 10,
Wherein the firing of the molded body is performed at a temperature of 1,000 ° C to 1,500 ° C. The method according to any one of claims 8 to 10,
Wherein the air diffuser has a length of 100 cm to 200 cm and air is injected at an air pressure of 0.25 MPa to 0.4 MPa. 14. The method of claim 13,
Wherein the fine bubbles have an average diameter of 140 mu m to 170 mu m.

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