KR101872161B1 - Nitrogen and phosphorus removal device for wastewater - Google Patents

Abstract

More particularly, the present invention relates to a nitrogen-phosphorus removal apparatus for wastewater, and more particularly, to an apparatus for removing nitrogen and phosphorus from wastewater, And a deaerator is provided to discharge the nitrogen component to the ammonia gas. The sludge settled in the second space is transported internally, and the lower and wastewater treated in the third space are filtered to be discharged And more particularly, to a nitrogen and phosphorus removal apparatus for advanced treatment of wastewater that can perform nitrogen and phosphorus removal more efficiently.

Description

[0001] Nitrogen and phosphorus removal device for wastewater [

More particularly, the present invention relates to a nitrogen-phosphorus removal apparatus for wastewater, and more particularly, to an apparatus for removing nitrogen and phosphorus from wastewater, And a deaerator is provided to discharge the nitrogen component to the ammonia gas. The sludge settled in the second space is transported internally, and the lower and wastewater treated in the third space are filtered to be discharged And more particularly, to a nitrogen and phosphorus removal apparatus for advanced treatment of wastewater that can perform nitrogen and phosphorus removal more efficiently.

Generally, an anaerobic tank and an anaerobic tank have been used as a method for removing nitrogen and phosphorus from wastewater. Mostly, A20 method and VIP method are used, but all of them are modified by anoxic tank and anaerobic tank. The anoxic and anaerobic tank plays an important role in the removal of nitrogen and phosphorus. In the anoxic tank, nitrate is removed by denitrification by the denitrifying microorganisms in the anoxic tank, and denitrifying microorganisms exposed to aerobic conditions in the anaerobic tank, By discarding one sludge, phosphorus removal is finally achieved. The supernatant, which is lowered in phosphorus concentration and organic matter concentration, is nitrified by the nitrifying microorganisms in the aerobic tank and internally transported back to the anoxic tank and denitrified to remove nitrogen.

The A20 method is to remove nitrogen and phosphorus by improving anaerobic-aerobic (A / O) method. It consists of anaerobic tank, anoxic tank, and aerobic tank, and is used for internal return to remove nitrogenous nitrogen and anaerobic tank Conveying and settling tank sludge conveying.

The Virginia Initiative Plant (VIP) method is a modification of the A20 method, which consists of an anaerobic tank, anoxic tank, and an aerobic tank. However, after removing nitrate nitrogen from the anoxic tank, the mixed liquid is returned to the anaerobic tank, And to recycle it to the anoxic tank for denitrification.

As such, a general facility for biologically treating nitrogen and / or phosphorus in waste and sewage includes a biological reaction tank such as an anaerobic tank, anoxic tank, and aerobic tank. The biological tank may be used in various combinations such as an anaerobic zone, an oxygen free zone, . In order to treat biologically nitrogen, aerobic and anaerobic zones are basically required, and when the ammonia nitrogen is oxidized in the aerobic zone, the resultant nitrate is converted to a heterotrophic microorganism that uses nitrate as the final electron acceptor in the anaerobic zone And is denitrified by nitrogen gas to be removed. In order to treat phosphorus biologically, anaerobic, aerobic and anaerobic areas are required. Phosphorus accumulating organism (PAO), which is a microorganism that over-consumes phosphorus in the anaerobic area, releases phosphorus and absorbs volatile organic acids. When PHA (poly-hydroxy alkanoate) is synthesized, phosphorus is excessively consumed while the PAO is grown using PHA in an exhalation region or an anoxic region, and phosphorus is removed by discharging PAO, which consumes excess phosphorus, through sludge .

When this principle is used, since the sludge from the settling tank flows into the anaerobic tank through which the waste water and sewage are introduced through the return sludge pipe, there arises a problem that the treatment of phosphorus is inhibited by a considerable amount of nitrate contained in the sludge. That is, the organic acid and biodegradable COD (RBCOD) contained in the incoming wastewater and sewage are firstly treated by an ordinary denitrifying heterotrophic organism, which does not over-consume phosphorus before being used by PAO in the anaerobic tank Therefore, PAO can not sufficiently synthesize PHA in the body, so phosphorus can not be absorbed in the aerobic tank afterwards, and phosphorus is discharged together with treated water as it is. In particular, the total phosphorus nitrogen (TKN) / COD and total phosphorus (COD) / COD ratios are high as in the case of general domestic sewage, and the degradation of phosphorus treatment efficiency by the A2O process can not be avoided under the condition of low RBCOD content in COD.

On the other hand, Korean Patent No. 10-1236696 discloses a method of minimizing the inflow of nitrate load due to the introduction of the return sludge into the anaerobic tank, which is a disadvantage of the A2O, and is effective in removing denitrification and oxidation of the return sludge nitrate, which is a disadvantage of the modified Johannesburg method, We have developed a biological waste water treatment system that can solve the problem of RBCOD consumption and increase phosphorus removal efficiency.

In the field of water quality, microbial-filled sewage and wastewater treatment facilities such as AF (Anaerobic Filter), UASB (Upflow Anaerobic Sludge Blanket) and SBBR (Sequning Batch Biofilm Reactor)

In the biological nitrogen removal process, it is aimed to remove phosphorus together with nitrogen mostly. However, in the biological phosphorus removal method, an anaerobic tank is added to overflow the sludge. At this time, the organic matter in the influent water is used competitively with the denitrifying microorganism, Efficiency is not in line with expectations.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and a method for separating a contact aeration basin into first, second and third spaces, The first carrier for adsorbing and removing nitrogen is disposed and the nitrogen component is discharged to the ammonia gas, the sludge settled in the second space is transported internally, and the lower and wastewater treated in the third space is filtered Thereby removing nitrogen and phosphorus from the wastewater which can perform nitrogen and phosphorus removal more efficiently.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the apparatus for removing nitrogen and phosphorus in a wastewater according to the present invention includes an anoxic tank, an anaerobic tank, an aeration tank, and a contact aeration tank, wherein the contact aeration tank includes a first partition plate A second space part for receiving the sedimented sludge, and a third space part for discharging the lower wastewater, wherein the first space part is divided into a first space part and a second space part, An air lift for sucking and discharging the precipitated sludge is installed in the second space part, a second carrier is installed in the third space part, and the first partition and the second part The diaphragm is discharged from the bottom of the contact aeration tank through the first and second spaces and the second carrier and discharged from the first space, Once installed, A suction pipe disposed at a lower portion of the first space and disposed at a lower end of the first space above the water surface of the first space portion and an injection nozzle for spraying lower and wastewater sucked from the suction pipe to the water surface of the first space portion, And the bottom of the third space part comprises an inclined surface inclined downward toward the second space part, the air diffusing part supplies air to the first support part, and is installed on an inclined surface of the bottom of the first space part, Wherein the lower end of the suction pipe is disposed between the diffuser and the first carrier to suck and discharge the lower wastewater that has passed through the first carrier and the sludge that has passed through the first carrier is discharged from the first space bottom Wherein the air lift is arranged at the bottom of the second space part and is settled by the inclined surface of the first and third space part bottom according to the guide of the inclined surface of the first space part, The sludge is sucked and discharged to remove ammonia gas by the degassing part disposed in the first space part and to remove phosphorus contained in the sludge settled on the bottom of the second space part by spatially separating in the contact aeration tank Are simultaneously processed.

According to the nitrogen and phosphorous removal apparatus of the present invention having the above-described constitution, the contact aeration and precipitation tank is divided into first, second and third space portions, and the first space portion contains an alkali component, And a deaerator is provided to discharge the nitrogen component to the ammonia gas. The sludge settled in the second space is transported internally, and the lower and wastewater treated in the third space are filtered to be discharged , There is an advantage that nitrogen and phosphorus removal can be performed more efficiently.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the respective constitutions of a nitrogen-phosphorus removal apparatus for a wastewater according to the present invention; Fig.
2 is a plan view showing a state in which each constitution of the nitrogen and phosphorus removal apparatus of the waste water is arranged.
3 is a perspective view showing a contact aquageteing basin according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the same or similar elements are denoted by the same or similar reference numerals, and a detailed description thereof will be omitted.

FIG. 1 is a schematic view showing each constitution of a nitrogen and phosphorus removal apparatus for waste water and wastewater according to the present invention, and FIG. 2 is a view showing the arrangement of respective components of a nitrogen and phosphorus removal apparatus for waste water wastewater according to the present invention FIG. 3 is a perspective view showing the contact aquageteing basin according to the present invention. FIG.

1 to 3, the apparatus 100 for removing nitrogen and phosphorus in the waste water according to the present invention mainly includes a flow rate adjusting tank 101, an anoxic tank 104, an anaerobic tank 105, aeration tank 110, A contact aeration settling tank 130, a disinfection tank 150, a discharge tank 153, and a sludge storage tank 170.

The flow rate adjusting tank 101 serves to lower the load on the aeration tank and the like by the lower and wastewater supplied to the flow rate adjusting tank 101, and an air diffuser 180 and an air lift 185 are provided.

The amount of influent wastewater flowing into the river varies seasonally from weekdays to weekdays and from one day to the next, and the water quality varies greatly. And the bottom, wastewater residence time and pollution concentration in the aeration tank are different from the design plan, which adversely affect microorganisms in the aeration tank and cause deterioration of the treated water quality.

Therefore, the lower and wastewater initially introduced into the nitrogen-phosphorus removal unit of the wastewater is allowed to stay in the flow rate adjustment tank 101 for a predetermined time to reduce fluctuation of the water quantity and to supply the water quality evenly. By supplying air from the air diffuser 180 installed in the flow rate adjusting tank 101, the dissolved oxygen in the wastewater is kept at an appropriate level and accumulation of deposits is prevented. The lower and wastewater of the flow rate regulator (101) is supplied to the anoxic tank (104) by using the air lift (185).

The anoxic tank 104 and the anaerobic tank 105 serve to remove nitrogen and phosphorus.

In the anoxic tank 104, the nitrate that is internally transported in the contact aeration tank 130 is denitrified by denitrifying microorganisms, thereby removing nitrogen.

The anaerobic tank 105 absorbs and removes the phosphorus component of the undigested microorganism.

Then, the supernatant having the phosphorus concentration and organic matter concentration lowered through the anaerobic tank 105 is nitrified by the nitrifying microorganisms through the aeration tank 110, is internally transported to the anoxic tank 104, and then is denitrified.

The anoxic tank 104 and the anaerobic tank 105 are provided with a stirring pump 106, respectively.

The aeration tank 110 facilitates the contact between the microorganisms and the wastewater. Thus, the pollutants contained in the wastewater and the wastewater are purified by being consumed as food for the microorganisms. Specifically, when the microorganisms undergo degradation of the organic matter, Or the substances dissolved in the wastewater are converted to sludge (microbial floc). The sludge generated in the aeration tank 110 is separated from the supernatant through the precipitation process in the contact aeration tank 130.

The aeration tank 110 is divided into a diaphragm 117 and an aeration section 111 through which the wastewater flows in the anaerobic tank 105 and a discharge section 115 for discharging wastewater treated under aeration.

The aeration unit 111 is provided with a flow bonus material 113 floating on the lower and wastewater, and a diffuser 110a is installed on the bottom.

The flowable bonnet material 113 may include at least one of cilia, wood chips, and styrofoam balls suspended in the wastewater. The flowable bonus material 113 serves to convert microorganisms into organic sludge.

The lower part of the diaphragm 117 is spaced apart from the bottom so that lower and wastewater and sludge of the aeration part 111 can be moved to the discharge part 115.

An air lift 185a is installed in the discharge part 115 to transfer the sludge deposited on the bottom to the anoxic tank 104.

The contact aeration basin 130 includes a first space 131 through which bottom and bottom wastewater flows by a first and a second diaphragm 145 and 145a arranged to face each other, 2 space part 137, and a third space part 140 through which the lower wastewater is discharged.

The first space 132 is provided with a first support 132, an aeration unit 180b and a deaeration unit 134. The second space 137 includes an air lift for sucking and discharging the precipitated sludge, And a second carrier 141 is installed in the third space part 140. [

The first diaphragm 145 and the second diaphragm 145a are spaced from the bottom of the contact aeration basin 130 and the lower and wastewater flowing into the first space 131 flows into the first support 132, The second space portion 137 and the second carrier 141 sequentially.

The air diffuser 180b is disposed directly below the first support 132 and supplies air or the like to the first support 132 to make contact therewith.

On the other hand, the first carrier 132 is placed on a mesh member 133 (punching net) disposed transversely to the first spatial part 131 and is composed of a granite powder, an ocher, an activated carbon powder, , Talc powder, 1 to 5 parts by weight of cement and 50 to 100 parts by weight of water are mixed with 100 parts by weight of at least two powders, and the mixture is molded and dried.

The first carrier may be a solid carrier for treating wastewater disclosed in Korean Patent No. 10-1261365 or may be used in a modified form.

When the first carrier 132 is in the form of a block, a through hole is formed so as to pass through the upper and lower portions. The first carrier 132 is laterally installed in the first space 131 and is vertically partitioned.

The first carrier 132 gradually melts while contacting oxygen or air aeration through the air diffuser 180b, thereby aggregating and precipitating phosphorus. When the first carrier 132 becomes alkaline, the ammonium ion (NH ₄ ⁺ ) contained in the waste water is reduced to ammonia (NH ₃ ) gas. Under the alkaline treatment, And the ammonia gas is reduced by spraying.

The deaerator 134 is installed through the first carrier 132 and has one end disposed directly below the first carrier 132 and the other end disposed on the water surface of the first space 131, And an injection nozzle 136 for spraying the lower and the wastewater sucked by the suction pipe 135 to the surface of the first space 131.

The second carrier 141 is disposed in the third space 140. A wood chip or a porous pellet is stacked on the net member 142 (punching net) disposed transversely to the third space 140, The sludge precipitated in the second space 137 is filtered to improve the sedimentation rate.

Unlike the first carrier 132, the second carrier 141 does not dissolve and is made of a porous material, thus facilitating the microbial culture and adsorbing and purifying the floating material.

An air lift 185b is provided on the bottom of the second space 137 to partition the sedimented sludge into a space defined by a pair of diaphragms 145 and 145a. A scum remover 138 Respectively.

The scum (bubble) removed by the scum remover 138 is internally conveyed to the anoxic tank 104.

The sludge sucked by the air lift 185b is transferred to the flow rate adjusting tank 101, the anoxic tank 104, the aeration tank 110, or the sludge storage tank 170.

The bottom of the first space 131 and the third space 140 may be inclined downward toward the second space 137.

The sludge descended on the inclined bottom of the first space portion 131 and the third space portion 140 collects toward the bottom of the second space portion 137 and thus the sludge is more efficiently separated through the air lift 185b So that it can be internally transported.

In this way, in the first space portion 131, phosphorus is precipitated and removed by the alkali component (for example, lime component) contained in the first carrier 132 and the alkaline component The ammonia gas is deaerated in the wastewater.

The activation tank 160 is provided with a microorganism culture reactor 161 and an air diffuser 180c for supplying oxygen or air to the microorganism culture reactor 161 as a site for cultivating or activating (positively) microorganisms .

A portion of the sludge transported in the contact aeration tank 130 is supplied to the activation tank 160 and cultured sludge is supplied to the aeration tank 110 through the aeration tube 180c and the microbiological culture reactors 161 .

The concentration of the culture sludge is 2,000 to 8,000 mg / l, and the dissolved oxygen is 1.0 to 2.0 mg / l.

The disinfection unit 150 disinfects and sterilizes the microorganisms contained in the waste water supplied from the third space 140 of the contact-aeration settling tank 130, and the ultraviolet sterilizer 151 is installed.

The ultraviolet sterilizer 151 is contained in the waste water in the disinfection tank and is sterilized by emitting ultraviolet rays which are fatal to microorganisms.

The bactericidal action of the ultraviolet rays causes ultraviolet rays having a wavelength of 20 to 280 nm to penetrate the cell membranes of various bacteria such as bacteria, viruses and the like to prevent further cell proliferation and damage the DNA.

The outflow tank 153 is for storing a predetermined period of time before discharging the waste water after the UV sterilization and discharging the supernatant by installing the overflow ware 155.

The sludge storage tank 170 receives the sludge that is internally conveyed in the contact aeration tank 130, temporarily stores the sludge, and an aeration pipe 180d is installed to promote equalization and mixing of the sludge.

The supernatant of the sludge storage tank 170 is sent to the flow rate regulator 101, and the stored sludge is discharged to the outside.

Referring to FIG. 2, the nitrogen and phosphorus removal processes of the lower and wastewater according to the present invention will be described below. The lower and wastewater that is internally transported in the sludge storage tank 170 or supplied from the outside is discharged from the flow rate control tank 101 to the anoxic tank 104 Nitrogen and phosphorus are sequentially removed from the anaerobic tank 105 through the aeration tank 110 and the first, second and third spaces 131,137 and 140 of the contact aeration tank 130 to remove the nitrogen and phosphorus from the disinfection tank 150 and the discharge tank 153 ) And then discharged to the outside.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: nitrogen, phosphorus removal device 101: flow rate control tank
104: Anoxic tank 105: Anaerobic tank
106: stirring pump 110: aeration tank
111: width base portion 113: floating bonus material
115: discharge part 117: diaphragm
130: contact aeration tank 131: first space part
132: first carrier 133: net member
134: deaeration section 135: suction pipe
136: jet nozzle 137: second space portion
138: Scum remover 140: Third space part
141: second carrier 142: net member
145, 145a: diaphragm 150: disinfection tank
151: Ultraviolet sterilizer 153: Discharging tank
155: overflow ware 160: activated tank
161: Culture Reactor 170: Sludge Storage
180: Aerodrome 185: Air lift

Claims (1)

A flow regulating tank for allowing the first and second inflow wastewater to stay for a predetermined period of time to reduce variations in the water quantity and to supply the water quality of the wastewater uniformly;
An anoxic tank for receiving waste water from the flow rate adjusting tank and performing denitrification;
An anaerobic tank for receiving the wastewater from the anoxic tank and consuming an excessive amount of phosphorus-containing microorganisms;
The anaerobic tank is supplied with wastewater, and the non-invasive fine particles or the substances dissolved in the wastewater are converted into sludge. The anaerobic tank is divided into diaphragms, one side of which is provided with aeration unit for introducing wastewater, And an aeration unit for discharging wastewater, wherein the aeration basin has an aeration tank in which a floating bonnet floating on the bottom wastewater is disposed;
The first and second diaphragms arranged so as to face each other, the first space portion into which the waste water flows, the second space portion which receives the precipitated sludge, and the third space portion into which the lower waste water is discharged. An air lift for sucking and discharging the precipitated sludge is installed in the first space, a first carrier, a diffuser, and a degasser are installed in the first space, and a second carrier is installed in the third space, Wherein the first and second diaphragms are separated from the bottom of the contact aeration basin and discharged from the first and second spaces through the first and second spaces, Wherein the deaeration section is installed through the first carrier and has one end disposed directly below the first support and the other end disposed above the water surface of the first space; 1 Spraying into the surface of space The bottom of the first space and the bottom of the third space are inclined downwardly toward the second space, and the air diffusing tube supplies air to the first carrier, Wherein the lower portion of the suction pipe is disposed between the air diffusing pipe and the first carrier and sucks and discharges the lower wastewater that has passed through the first carrier to spray the lower portion of the sludge passing through the first carrier, Is settled down to the bottom of the second space portion which is divided by the inclined surface of the bottom of the first and third space portions according to the guide of the inclined surface of the first space portion bottom, The removal of ammonia gas by the degassing unit disposed in the first space unit and the removal of phosphorus contained in the sludge settled on the bottom of the second space unit are performed by contacting and discharging the precipitated sludge placed on the floor, A contact aeration settler for simultaneous treatment in a spatially separated state in an aeration settler;
An activator for supplying a part of the sludge internally conveyed in the contact aeration tank to the cultivation sludge through a microbial culture reactor to supply the cultured sludge to the aeration tank;
A disinfection unit provided with an ultraviolet sterilizer for sterilizing or sterilizing the microorganisms contained in the lower and wastewater supplied from the third space portion of the contact aeration tank;
A discharging tank for discharging the waste water after storing the ultrapure water for a predetermined period before discharging the waste water;
And a sludge storage tank for receiving a part of the sludge internally conveyed in the contact aeration tank and temporarily storing the sludge, sending the supernatant to the flow rate adjusting tank, and discharging the stored sludge to the outside,
The bubbles removed by the scum remover provided on the water surface of the second space part, the part of the sludge which is internally transported in the contact aeration and settling tank, and the part of the lower and wastewater treated by the aeration part are internally transported to the anoxic tank Characterized in that the nitrogen, phosphorus removal device of the waste water.

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