KR20150016775A - Advanced water treatment system with improved treatment efficiency for concentrated sludge - Google Patents

Abstract

The present invention provides an advanced treatment system which enhances the removal efficiency of organic matter, nitrogen, phosphorus, etc. included in wastewater and allows complete solid-liquid separation by using a biological treatment process with a physical treatment process. Provided is an advanced treatment system comprising (a) an anoxic tank equipped with an agitator to denitrify raw water from a flow equalization tank; (b) an anaerobic tank into which water to be treated flows from the anoxic tank, storing organic matter in a form of poly-β-hydroxybutyrate (PHB) in an anaerobic condition and equipped with an agitator to induce phosphorus release; (c) a contact aeration tank equipped with a fixed bed contact media and an aerator to oxidize the organic matter and ammoniacal nitrogen (NH4+-N) in the raw water where phosphorus release is induced in the anaerobic tank by microorganisms; (d) a sequencing batch reactor equipped with an immersed membrane and an aerator to separate the raw water treated from the contact aeration tank into sludge-containing solids and treated water and inducing precipitation with respect to the sludge-containing solids to concentrate the sludge-containing solids and generate concentrated sludge; (e) a treated water tank to store the treated water from the sequencing batch reactor; and (f) a concentrated sludge storage tank to store the concentrated sludge from the sequencing batch reactor. The inner side of the sequencing batch reactor has a shape that gradually becomes narrow downwards, and a swirl inducing device is arranged on the inner side of the sequencing batch reactor in order to allow the concentrated sludge to be precipitated to the center of the inside of the sequencing batch reactor by inducing swirl with respect to the sludge-containing solids.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an advanced treatment system for treating concentrated sludge,

TECHNICAL FIELD The present invention relates to an advanced treatment system for removing nitrogen, phosphorus, etc. contained in sewage, wastewater, sewage, etc. More specifically, the present invention relates to a biological treatment using a contact aeration tank provided with an anoxic tank, anaerobic tank, The removal efficiency of organic substances, nitrogen, phosphorus, etc. contained in sewage, wastewater, and sewage is improved by performing the treatment in the same space as the sedimentation function and the degassing function as well as the membrane separation function using the sedimentation tank The present invention relates to a system that not only solves the problems in the designing of the system, but also occupies a minimum space in spite of coping with unexpected situations such as inflow of raw water exceeding design capacity, power outage, machine breakdown and the like.

Conventional biological processes such as Anaerobic-Anoxic-Oxic (A2O) process, UCT process, VIP process, and 5-step vacuum process have been developed in order to simultaneously remove nitrogen and phosphorus contained in sewage, wastewater, Five-Stage Bardenpho) process.

The A2O process (anaerobic / anoxic / aerobic) is a modification of the AO process operated by anaerobic and exhalation processes, and an anaerobic process for denitrification is added between the anaerobic process and the exhalation process. This process is superior to the AO process in denitrification performance, but its performance is uncertain in cold climatic conditions and it is operated in complicated process compared to AO process.

The UCT process (anaerobic / anoxic / anaerobic / aerobic) is performed by an anaerobic process, a first anaerobic process, an internal transport process from the first anaerobic process to an anaerobic process, and then a second anaerobic process from the second anaerobic process, , And a step of carrying the sludge produced through such a process to the first anoxic process. Thus, the nitrate inflow to the anaerobic process is removed by the activated sludge transport process, which recycles the activated sludge to the anaerobic process, resulting in increased phosphorus release in the anaerobic process and increased removal of organic matter in the anaerobic process by the internal circulation process. This process removes the need for nitrate transport, creates a better phosphorus removal environment in the anaerobic process, and is advantageous in that the volume of the reaction vessel is smaller than that of the Badenpo process. However, And the maintenance is increased, the necessity of drug injection is uncertain, and a high BOD / P ratio is required. Also, the effect of temperature on the process performance of this process is not well known.

In the VIP process (anaerobic / anaerobic / aerobic process), raw nitrified water from the anaerobic process, anaerobic process, anaerobic process, denitrified raw water to anaerobic process inflow line, aerobic process, And an oxygen-free process. This process reduces the oxygen demand and alkalinity consumption by nitrate transport to the anoxic process and reduces the nitrate load of the exhalation process by returning the anaerobic process effluent to the anaerobic process, It is possible to increase the pump energy and maintenance by a large amount of internal circulation and reduce nitrogen removal ability by low temperature.

The anaerobic process, the first anoxic process, the first process, the process from the first process to the first anaerobic process, the second anaerobic process, the second anaerobic process, , A second unit process, and a process of combining the produced sludge with the influent water flowing into the anaerobic process. This process has the advantages of less sludge production compared to other phosphorus removal processes, lower total nitrogen concentration in the treatment water, and the need for chemical injection into the process by returning the alkalinity to the process is reduced or eliminated, Pump energy and maintenance are increased due to internal circulation, which requires a larger tank volume as compared with the above-mentioned A2O process. Also, since the primary precipitation reduces nitrogen and phosphorus removal capability and requires a high BOD / P ratio have. Also, the effect of temperature on the process performance of this process is not well known.

As described above, the conventional advanced treatment process for removing nitrogen and phosphorus and the system therefor are advantageous as described above. However, the seasonal change is obvious, that is, the temperature change due to the season is obvious, It is not suitable to use in the situation of our country which does not conform to the property. In addition, there is no countermeasure in the case where the water flow characteristic is variable or the raw water is supplied in an excess amount by the conventional advanced processing as described above.

In recent years, a membrane separation process using a separation membrane has been developed and applied in addition to a biological treatment process. In the case of advanced treatment systems, such as sewage, wastewater, and sewage, which employ a membrane, it is advantageous in terms of being able to obtain high quality treated water as compared with other systems that do not use membranes. However, It is difficult to actively cope with various changes in processing sites such as power failure and machine failure.

In view of the problems of the prior art, the present inventor has developed an advanced treatment system that can meet the characteristics of domestic sewage, wastewater, and sewage, while improving the quality of treated water as well as actively coping with various changes in the treatment plant . This is well known from the applicant's Registration No. 10-0515098.

In the above-mentioned Patent No. 10-0515098 of the present applicant, the membrane separation tank and the precipitation degreasing tank are sequentially formed in the next step of the contact coral tank. Particularly, in the sedimentation degassing tank, concentrated sludge is generated in the lower part thereof. When the concentrated sludge is transferred from the lower part of the sedimentation degassing tank to the concentrated sludge storage tank, as shown in FIG. 4, For example, an angle-type scraper 410 is required to rotate along the bottom floor of the settling melter basin to be centered. Due to the presence of such a scraper 410, the membrane separation tank and the precipitation and degassing tank can not be separately operated. 4, reference numeral 400 denotes a drive shaft which is rotationally driven by a motor M, and reference numeral 402 denotes a support for keeping the scraper 410 at a predetermined distance from the bottom of the sedimentation and degassing vessel.

Korean Patent No. 10-0515098 (titled " Advanced Processing System for Removing Nitrogen and Phosphorus ", published on Sep. 07, 2005)

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a biological treatment using a contact aeration tank provided with an anoxic tank, anaerobic tank and fixed bed contact media, a membrane separation function using an immersion type membrane, By simultaneously performing the functions performed in such a space, it is possible to improve the removal efficiency of organic substances, nitrogen, phosphorus, etc. contained in sewage, wastewater, sewage and the like and to solve problems in the settling tank through complete solid- And to provide a system that occupies a minimum space in spite of coping with unexpected situations such as inflow of raw water, power outage, and machine breakdown.

In order to achieve the above and other objects,

1. An advanced treatment system for removing organics, nitrogen and phosphorus,

(a) an anoxic tank having an agitator for denitrifying raw water from a flow rate regulator;

(b) an anaerobic tank having an agitator for storing treated water in the anoxic tank and storing organic matter in the form of poly-β-hydroxybutyrate (PHB) in an anaerobic state and inducing phosphorus release;

(c) a contact aeration tank provided with a stationary phase contact medium for oxidizing organic matter and ammonia nitrogen (NH ₄ ⁺ -N) in the raw water from which the phosphorus emission is induced in the anaerobic tank by microorganisms and an aeration device;

(d) a continuous batch reactor equipped with an immersion type separation membrane and an aeration apparatus for solid-liquid separation of raw water treated from the contact aeration tank with solid matter containing solid matter containing sludge and treated water, and a sludge- A continuous batch reactor for concentrating the material to produce concentrated sludge;

(e) a treatment bath for storing the treated water from the continuous batch reactor; And

(f) a concentrated sludge storage tank for storing the concentrated sludge from the continuous batch reaction tank,

Wherein the continuous batch type reaction tank has an outer shape that gradually becomes narrower as its interior is downward, and a swirling flow inducing device for causing a swirling flow to the sludge-containing solid matter in the inner side of the continuous batch type reaction tank, The present invention provides an advanced processing system.

According to one preferred embodiment of the present invention, a screen tank and a water collecting tank are sequentially disposed at the front end of the flow rate adjusting tank.

According to another preferred embodiment of the present invention, a pressurized floating vessel for pretreating raw water having high or high concentration of oil on the wastewater characteristic is installed between the water collecting tank and the flow rate adjusting tank. Here, the floating separation tank is characterized in that a PH adjustment tank, a reaction tank, an aggregation tank, and a floating tank are sequentially applied.

In the present invention, a conveying means for conveying a part of the concentrated sludge from the continuous batch type reaction tank to the contact aeration tank is provided.

Further, in the present invention, the swirl flow induction device is characterized in that the sludge-containing material is arranged so as to flow along the circumferential direction on the basis of the center of the continuous batch reaction tank.

The system according to the present invention comprises biological treatment using contact aeration tank equipped with anoxic tank, anaerobic tank and stationary phase contact media, and physical treatment using an alternative continuous batch reactor with the precipitation function and concentration function of the sludge containing sludge together with the submerged separator, ㅇ It improves the removal efficiency of organic matter, nitrogen and phosphorus contained in wastewater and sewage and solves problems in sedimentation tank through complete solid-liquid separation. In addition, it can solve problems such as influx of raw water exceeding design capacity, It can cope with situation quickly and perfectly, and it is possible to always secure stable water quality.

In addition, the system according to the present invention can ensure the stable quality of the treated water by the buffering action by the contact material provided in the contact aeration tank.

Furthermore, the system according to the present invention has the advantage that the initial facility cost can be greatly reduced by reducing the residence time and greatly reducing the size of the reactor.

In addition, since the sludge-containing solid material is concentrated and accumulated at the lower center of the sludge-containing solid material by the swirl flow inducing device applied to the continuous batch reactor of the present invention, subsequent sludge thickening process can be omitted, The advantage is provided.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an overall process of an advanced treatment system according to one preferred embodiment of the present invention.
2 is a diagram illustrating some processes of an advanced processing system according to one preferred embodiment of the present invention.
FIG. 3 is a view showing a process of concentrating a sludge-containing solid material in a continuous batch reactor applied to one preferred embodiment of the present invention.
FIG. 4 is a view showing a state in which a solids-containing sludge is scraped from the bottom of the inner center of the sludge in a conventional sedimentation-deaeration tank.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the following illustrative drawings. In describing the present invention, a description of known functions or configurations will be omitted for the sake of clarity of the present invention. In addition, like reference numerals designate like elements throughout the specification.

FIG. 1 is a diagram showing an overall process of an advanced treatment system according to one preferred embodiment of the present invention, FIG. 2 is a view showing a part of a process of an advanced treatment system according to one preferred embodiment of the present invention, Is a view showing a process of concentrating sludge-containing solid matter in a continuous batch reactor tank applied to one preferred embodiment of the present invention.

First, referring to FIG. 1, sewage, wastewater, sewage, etc. (hereinafter referred to as "raw water") is introduced into a screen tank 10 having a screen 12, for example, Lt; / RTI > Thereafter, wastewater, wastewater, sewage, etc. (hereinafter referred to as "raw water") flows into the flow rate regulator 110 through the raw water inflow line.

At this time, when the raw water has a large amount of oil or has a high concentration, the raw water transfer pump 22 installed in the water collecting tank 20 undergoes a process by a pressurized floating bath as shown by reference numeral 30 in FIG. 1 . The pressurized floating tank 30 includes a pH adjustment tank whose pH is adjusted by NaOH from the NaOH storage tank 44 as shown in FIG. 1, a reaction tank which is treated by alum from an Alum storage tank 54, (50), a flocculation tank (60) flocculated by a polymer from a polymer reservoir (64), and a floating tank (70) subjected to a pressure float treatment by a motor and an aerator. At this time, it is preferable that the PH adjusting tank 40, the reaction tank 50, and the flocculating tank 60 are provided with stirrers 42, 52, and 62, respectively, in order to more actively promote the reaction. This pressurized floating tank 30 itself is well known in the art.

Referring to FIG. 1 again, the raw water from the water collecting tank 20 or the pressurized floating tank 30 flows into the flow rate adjusting tank 110 through the raw water inflow line. As shown in the figure, the flow rate adjusting tank 110 not only keeps the concentration of raw water flowing into the tank 110, but also controls the flow rate of the raw water treated in the air diffusing tank 110 and the air diffuser 114, One or more feed pumps 116 for feeding the feed water and a level switch 118 for controlling the operation of the feed pump 116 by sensing the amount of raw water to be introduced.

The raw water that has passed through the flow rate adjusting tank 110 is transferred to the drum screen 115 by the transfer pump 116 to remove the solid matter in the raw water up to the fine particles and the raw water from which the solid matter is removed is transferred to the anoxic tank 120 .

In the anoxic tank 120, nitrate nitrogen (for example, NO3-N) in the sludge-containing solid material conveyed from the continuous batch type reactor 150 is reduced under anaerobic conditions using the organic matter of the treated water flowing in the flow rate adjustment tank 110 A denitrification reaction that releases nitrogen gas (N2) occurs. That is, in this denitrification step, the organic matter is oxidized by denitrifying bacteria using nitrate nitrogen as an electron acceptor instead of oxygen, and nitrate nitrogen is reduced to nitrogen gas. Through this process, the reduced nitrogen gas is finally released into the atmosphere and removed. At this time, the anoxic tank 120 is provided with an agitator 122a for maximizing the reaction by giving much opportunity for contact between the raw water and the sludge-containing solid matter conveyed from the continuous batch type reaction tank 150, which will be described later, do. The anoxic tank 120 may be operated in the form of one reactor, but may be operated in the form of two or more reactors when considering the efficiency of the treatment.

The denitrified raw water in the anoxic tank (120) is transferred to the anaerobic tank (130). In the anaerobic tank 130 under anaerobic conditions, phosphorus release is induced by treating the denitrified raw water in the anoxic tank 120 with an anaerobic microorganism to release poly-β-hydroxybutyrate, which is a high molecular substance, into ophosphate. At this time, the anaerobic tank 130 is preferably provided with an agitator 132b for the purpose of maximizing the reaction.

The raw water from which the phosphorus emission is induced in the anaerobic tank 130 is transferred to the contact aeration tank 140. The contact aeration tank 140 is provided with a contact material having a microorganism attached thereto for oxidizing organic matter and ammonia nitrogen (NH4 + -N) remaining in the raw water flowing into the microorganism (for example, NO3-N) (Not shown). Due to the use of the fixed phase contact material 146, the orthophosphate released from the anaerobic tank 130 is synthesized as poly-beta -hydroxybutrate, which is a polymer material, up to about 8 times the released amount. The use of the contact material 146 increases the contact time between the raw water flowing into the contact aeration tank 140 and the microorganisms and thereby reduces the size of the contact aeration tank 40, Effect. On the other hand, the contact aeration tank (140) is provided with an air diffuser (144) in addition to the above-mentioned contact media.

The raw water treated in the contact aeration tank (140) is transferred to the continuous batch reactor (150). In the continuous batch reactor 150, the solid-liquid separation is performed using the submerged separation membrane 156 with the sludge-containing solid material and the treatment water. At this time, the pore of the submerged separation membrane 156 is smaller than the size of E. coli, so that suspended substances and E. coli are filtered. The submerged separation membrane 156 is cleaned in a separate cleaning bath 190, and if necessary, is subjected to chemical cleaning in the event of fouling of the membrane surface causing clogging of the membrane.

The raw water introduced into the continuous batch reactor (150) is aerated by an aeration unit which is an aeration unit. The aeration treatment is carried out for 1 hour to 5 hours, the time being adjusted according to the capacity. Then, immediately before the aeration by the air diffusing pipe is stopped, the swirling flow inducing device 151 induces a swirling flow therein. During this process, the aeration by the aeration engine is stopped and only the swirling flow by the swirling flow inducing device 151 is maintained. At this time, the continuous batch type reaction tank 150 used in the system according to the present invention has an outer shape that gradually becomes narrower downward in order to smoothly perform its function as a settling tank.

When the swirling flow by the swirl flow induction device 151 is induced in this manner, the sludge-containing solid matter is concentrated in the inclined inner central portion of the continuous batch reaction tank 150, particularly, as shown by S of 2.

This concentrated sludge S is conveyed from the lower center of the continuous batch reactor 150 to the concentrated sludge storage tank 180 as shown in Figure 3 and by this transfer the large amount of sludge S shown in Figure 3, The concentrated sludge is transferred to the concentrated sludge storage tank 180. By this process, the sludge thickening tank which has been conventionally required can be omitted. Most of the sludge transferred to the concentrated sludge storage tank 180 is dehydrated by the dehydration facility 300 and then subjected to consignment treatment, and a part of the sludge is returned to the flow rate adjustment tank 110.

On the other hand, the treated water in the upper part of the concentrated sludge is conveyed to the treatment water tank 170 through the immersion separation membrane 156, or the upper surface treatment water is supplied to the treatment water tank 170 by a means such as a decanter Lt; / RTI >

In the system according to the present invention, the aeration units 114, 144 and 154 provided in the respective reactors may have a structure for supplying air by individual blowers. However, considering the facility cost, It is advantageous to have a structure to be supplied by one blower 200 as described above. The blower 200 not only supplies air to each reaction tank to aerate the raw water, but also maximizes the chance of contact between the microorganisms and the food, thereby improving the purification efficiency.

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 and scope of the invention as defined in the following claims. It can be understood that it is possible.

10: Screen group 12: Screen
20: Water collecting tank 30: Pressurized floating tank
40: PH adjusting tank 44: NaOH storage tank
50: Reagent 54: Alum storage tank
60: Coagulation tank 150: Continuous batch reactor
151: Swirl flow induction device

Claims (6)

1. An advanced treatment system for removing organics, nitrogen and phosphorus,
(a) an anoxic tank having an agitator for denitrifying raw water from a flow rate regulator;
(b) an anaerobic tank having an agitator for storing treated water in the anoxic tank and storing organic matter in the form of poly-β-hydroxybutyrate (PHB) in an anaerobic state and inducing phosphorus release;
(c) a contact aeration tank provided with a stationary phase contact medium for oxidizing organic matter and ammonia nitrogen (NH ₄ ⁺ -N) in the raw water from which the phosphorus emission is induced in the anaerobic tank by microorganisms and an aeration device;
(d) a continuous batch reactor equipped with an immersion type separation membrane and an aeration apparatus for solid-liquid separation of raw water treated from the contact aeration tank with solid matter containing solid matter containing sludge and treated water, and a sludge- A continuous batch reactor for concentrating the material to produce concentrated sludge;
(e) a treatment bath for storing the treated water from the continuous batch reactor; And
(f) a concentrated sludge storage tank for storing the concentrated sludge from the continuous batch reaction tank,
Wherein the continuous batch type reaction tank has an outer shape that gradually becomes narrower as its interior is downward, and a swirling flow inducing device for causing a swirling flow to the sludge-containing solid matter in the inner side of the continuous batch type reaction tank, And a control unit for controlling the operation of the altitude processing system. The method according to claim 1,
Wherein a screen tank and a water collecting tank are sequentially disposed at a front end of the flow rate adjusting tank. The method of claim 2,
Characterized in that a pressurized floating tank for pretreating raw water having high or high concentration of oil in the wastewater is provided between the water collecting tank and the flow rate adjusting tank. The method of claim 3,
The float-
The pH adjustment tank, the reaction tank, the flocculation tank, and the floating tank are sequentially applied. The method according to any one of claims 1 to 4,
And a conveying means for conveying a part of the concentrated sludge from the continuous batch reactor to the contact aeration tank. The method according to any one of claims 1 to 4,
Wherein the swirl flow inducing device is arranged such that a sludge-containing material flows along a circumferential direction with respect to a center of the continuous batch reactor.

Images