KR101566953B1 - Liquid treatment facility - Google Patents

Abstract

The present invention relates to a water treatment facility for treating wastewater. The water treatment facility according to the present invention comprises a wastewater supply tank for storing wastewater, a line mixer for passing wastewater supplied from the wastewater supply tank, a flocculant supply device and a neutralization agent supply device for providing a flocculant and a neutralizer to the line mixer, A mixer in which the wastewater passing through the mixer flows, a stirrer installed in the mixing tank, a plurality of low specific gravity floating bristles for filtering the wastewater passing through the mixing tank and filtering the agglomerated phosphorus in the wastewater, A first filtration tank provided with a first lower filtration biofilm layer and a first lower filtration biofilter layer and a first upper filtration net and a first lower filtration net to confine a plurality of low specific gravity floating particulate filter media and high density particulate floating filtration media, A first air supply device for supplying air to the wastewater in the filtration tank; A first cleaning device having a plurality of injection nozzles for supplying washing water for washing a plurality of particulate floating filter media when a plurality of particulate floating filter media is held on a first lower filtering sludge, And a sludge discharge line for discharging the sludge.

Description

[0001] Liquid treatment facility [

The present invention relates to a water treatment facility for treating wastewater, and more particularly, to a water treatment facility for treating wastewater using a biofilter layer composed of a plurality of particulate floating media instead of a simple simple coagulation method to effectively remove pollutants such as phosphorus Water treatment facility.

In water treatment, wastewater coming from factories, cities, etc. often contains a large amount of toxic substances and harmful substances, so it is said that it is purified or recovered and treated with the prescribed water quality limit (water pollution prevention law).

Wastewater discharged from factories and establishments should be purified and drained until they meet the standards stipulated in the Environmental Policy Basic Law, the Water Quality Environment Conservation Act, the Law on the Treatment of Sewage, Manure and Livestock Wastewater. For this purpose, wastewater is treated by solid / liquid separation, physicochemical treatment, biological treatment etc. depending on the type and contents of wastewater.

The solid-liquid separation method is for separating and recovering the suspended matters in the wastewater, and the treatment cost is low and the operation management is easy. Though sedimentation separation method by gravity is most widely used, there is a method of naturally collecting floating objects on the water surface, which is contrary to gravitational settling, and a forced float separation method using the upward force of micro-bubbles generated by blowing or decompression Is also used.

Physicochemical treatment methods include neutralization, pH adjustment, oxidation / reduction, extraction, and adsorption. Neutralization / pH adjustment is to inject acid or alkali into the wastewater to release the dissolved gas or flocculate the metal salt, and to adjust to the most suitable pH for subsequent treatment. Oxidation and reduction include oxidation and reduction using a chemical agent, electrolytic treatment, and oxidative decomposition using ozone or ultraviolet rays. The extraction is a method of recovering a useful substance present in the wastewater by using a solvent, and the adsorption is a method of treating various organic substances and ammonia in the wastewater by an adsorbent such as activated carbon or zeolite. In addition, ion exchange, electrodialysis, and treatment with reverse osmosis membrane are also a kind of physico-chemical treatment.

Biological treatment is a method of treating wastewater using microorganisms. Depending on the type of contact between the microorganisms and the wastewater, it is classified into a floating suspension method and a fixing method. In the suspended suspension method, microorganisms and wastewater are mixed to separate suspended microorganisms into suspended water and microorganisms, and microorganisms are returned to water treatment. Fixation methods include spraying method, rotary disk method, immersion furnace method, fluidized bed method, etc. All of them have a fixed support for attaching microorganisms, so that only the wastewater passes around the fixing microorganisms.

Recently, the content of phosphorus (P) in wastewater has been increasing. Phosphorus occurs in the natural state due to sewage or feces and is contained in a large amount in detergents. As a result, the concentration of phosphorus in living sewage increases with the increase in the amount of synthetic detergents used recently and causes eutrophication. In order to manage the total population, which is the main cause of eutrophication, which is the main cause of eutrophication of lakes and rivers, at the level of advanced countries, the total phosphorus concentration of effluent of wastewater treatment plant was changed from 20 mg / L to 0.2-0.5 mg / L Respectively.

As a technique for removing phosphorus in wastewater, a coagulation method through the use of coagulant has been widely used. For reference, a total phosphorus abatement technique through coagulant administration is disclosed in Patent Publication No. 1289699 (published on Mar. 11, 2013), Registered Patent No. 1226035 (Registered on Mar. 01, 2018), Published Patent Publication No. 2013-0047301 (Published on May 03, 2013) and the like have been disclosed.

However, when the concentration of the total phosphorus in the treated water is lowered to 0.1 mg / L or less by the conventional chemical coagulation treatment, there is a problem that the economical efficiency is drastically lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a biofilter structure that can effectively remove pollutants such as phosphorus from wastewater by utilizing a biofilter layer composed of a plurality of particulate floating media, Water treatment facility.

According to another aspect of the present invention, there is provided a water treatment system comprising: a wastewater supply tank for storing wastewater; a line mixer installed in a middle of the wastewater guide line through which the wastewater supplied from the wastewater supply tank is passed; A line mixer for supplying a neutralizer to the line mixer; a mixer for introducing the wastewater passing through the line mixer; a line mixer for dispersing a coagulant and a neutralizer introduced into the wastewater into the wastewater, A first low specific gravity floating filter medium composed of a plurality of low specific gravity floating particulate filter media for introducing wastewater passing through the mixing tank and filtering the aggregated phosphorus in the wastewater, A plurality of high-boiling particulate floating media having a larger specific gravity The first high specific gravity biofilter layer and the first high specific gravity biofilter layer spaced below the first low specific gravity biofilter layer are passed through and a plurality of through holes are formed to pass the plurality of low specific gravity floating particulate filter media and the high density particulate floating filter media A first filtration tank having a first upper filtration net and a first lower filtration net disposed on an upper portion of the first low specific gravity biofilter layer and a lower portion of the first high specific gravity biofilter layer; A first air supply device having a plurality of diffusers disposed below the first high-cost biofilter layer to reduce the water level of the wastewater in the first filtration tank, and the plurality of low specific gravity floating- When the particulate floating filter medium is supported on the first lower sieve net, the plurality of low specific gravity floating filter media and the plurality of high density particulate filter media A first cleaning device having a plurality of injection nozzles disposed on the first lower sieve mesh to supply washing water for washing the granular floating sorbent material; a sludge settling in the first filtration tank is discharged to the outside of the first filtration tank And a sludge discharge line connected to the primary filtration tank.

The water treatment facility according to the present invention further includes a treatment water supply pump installed in the discharge adjustment tank for storing the treatment water passed through the primary filtration tank and supplying the treatment water of the discharge adjustment tank to the spray nozzles of the first cleaning device .

Wherein the mixing chamber comprises a primary mixing chamber into which the wastewater having passed through the line mixer flows and a secondary mixing chamber into which the wastewater in the primary mixing chamber flows through a passage provided in a partition wall disposed between the primary mixing chamber And a plurality of the stirrers may be respectively disposed in the primary mixing chamber and the secondary mixing chamber.

The primary filtration tank may include a sludge collection chamber having a sludge discharge port connected to the sludge discharge line and a sludge guide surface inclined toward the sludge collection chamber to guide the sludge settled in the primary filtration tank to the sludge collection chamber have.

The water treatment facility according to the present invention may further include a washing water injection mechanism installed in the primary filtration tank so as to wash the sludge accumulated on the sludge guide surface by spraying washing water toward the sludge guide surface toward the sludge collecting chamber.

The first cleaning device may further include a washing water distribution pipe provided between the first upper sieve and the first lower sieve mesh to support the plurality of spray nozzles and a washing water distributing pipe for supplying wash water to the washing water distributing pipe, And a washing water distribution pipe exercise device for moving the washing water distribution pipe through the washing water guide pipe.

The water treatment facility according to the present invention is characterized in that the water treatment facility is partitioned from the wastewater inflow chamber through a wastewater inflow chamber for temporarily storing the wastewater introduced from the outside and a partition wall disposed between the wastewater inflow chamber and a treatment A wastewater water flow line for introducing the wastewater in the wastewater inflow chamber into the wastewater supply tank, a treatment water guide line for introducing the wastewater from the primary filtration tank into the wastewater inflow chamber, A bypass passage provided in the partition so that the wastewater in the wastewater inflow chamber can be bypassed to the treated water inflow chamber, a bypass passage opened and closed for opening and closing the bypass passage, And may further include a mechanism.

The water treatment facility according to the present invention is characterized in that when the water level of the wastewater is lowered in the primary filtration tank and the plurality of particulate floating media is supported on the first lower filtering net, A brush disposed between the filtering net and the first lower filtering net, and a brush moving device for moving the brush.

The water treatment facility according to the present invention comprises a second low specific gravity biofilter layer composed of a plurality of low specific gravity floating particulate filter materials for introducing wastewater passing through the primary filtration tank and filtering the aggregated phosphorus in the wastewater, Weight particulate floating filter medium having a specific gravity larger than that of the low specific gravity floating particulate filter material constituting the filter layer, and a second high specific gravity biofilter layer spaced apart from the second low specific gravity biofilter layer apart from the second low specific gravity biofilter layer, Weight biofilter layer and the plurality of low specific gravity particulate floating media constituting the second high specific gravity biofilter layer and the plurality of high gravity particulate floating media in the second low specific gravity biofilter layer, And a second upper sieve mesh and a second lower sieve mesh disposed below the second high- A second air feeder having a plurality of diffusers disposed below the second biofilter layer for supplying air to the wastewater in the second filtration tank; Wherein when the plurality of low specific gravity floating particulate materials constituting the second low specific gravity biofilter layer and the second high specific gravity biofilter layer and the plurality of high gravity particulate floating materials are supported by the second lower sieve net, The second low specific gravity biofilter layer and the plurality of low specific gravity floating filter media constituting the second high specific gravity biofilter layer and the washing water for washing the plurality of high specific gravity floating filter media are disposed on the second lower filtering cloth A sludge settling in the secondary filtration tank is introduced into the secondary filtration tank, And a sludge outlet provided in the secondary filtration tank for discharging the sludge to the outside.

The water treatment system according to the present invention is characterized in that the wastewater flowing from the outside is passed through a line mixer and a coagulant and a neutralizer are introduced into the wastewater from the outside and then the coagulant and the neutralizer are evenly dispersed in the wastewater in the mixing tank to coagulate phosphorus contained in the wastewater, The filtration process is performed on the pollutants such as agglomerates in the wastewater in the primary filtration tank and the secondary filtration tank equipped with the biofilter layer constituted by the granular floating media of the granular floating material. The particulate floating media constituting the biofilter layer has a function of supporting the growth of microorganisms capable of decomposing organic substances and filtering out pollutants such as suspended solids in the wastewater. As a result, organic pollutants or phosphorus And other pollutants. Particularly, a high specific gravity biofilter layer composed of a low specific gravity floating filter medium composed of a low specific gravity floating particulate filter material and a high specific gravity floating particulate filter material is arranged so as to be vertically spaced apart from one another in the inside of one filtration tank, So that the filtration efficiency can be increased.

In addition, the water treatment facility according to the present invention can efficiently operate and reduce the operation cost by using the filtered treatment water as wash water for washing the granular floating media constituting the biofilter layer installed in the filtration tank.

In addition, the water treatment facility according to the present invention temporarily stores the filtered treated water in a treated water inflow chamber of a distribution tank provided with a wastewater inflow chamber from which wastewater flows from the outside, and discharges the treated water to the outside. The wastewater inflow chamber and the treated- And is connected by a bypass passage opened and closed by a path passage opening / closing mechanism. Therefore, when the flow rate of the wastewater flowing from the outside is larger than the treatment flow rate of the water treatment facility or the water treatment process of the water treatment facility is abnormal, the bypass passage is opened to bypass the wastewater in the wastewater inflow chamber to the treatment water inflow chamber The wastewater can be mixed with the treated water to be discharged to the outside. As a result, the pollution degree of the wastewater discharged to the outside can be lowered even in an emergency situation.

FIG. 1 is a schematic view showing a water treatment facility according to an embodiment of the present invention.
2 shows a first filtration tank of a water treatment plant according to an embodiment of the present invention.
3 shows another embodiment of the filtration tank provided in the water treatment facility according to the present invention.
4 shows another embodiment of the filtration tank provided in the water treatment facility according to the present invention.

Hereinafter, a water treatment system according to the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, the sizes and shapes of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation. In addition, the terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

FIG. 1 is a schematic view showing a water treatment facility according to an embodiment of the present invention, and FIG. 2 is a view showing a primary filtration tank of a water treatment facility according to an embodiment of the present invention.

As shown in FIG. 1, the water treatment facility 10 according to an embodiment of the present invention includes a distribution tank 11 for temporarily storing wastewater and water treated in the outside, A line mixer 24 into which wastewater flows in the wastewater supply tank 21, a mixing tank 35 into which the wastewater that has passed through the line mixer 24 flows, A secondary filtration tank 72 into which wastewater that has passed through the primary filtration tank 42 flows and a secondary filtration tank 72 through which the wastewater that has passed through the secondary filtration tank 72 flows A treatment water tank 80 into which treated water flows and a discharge adjustment tank 81 into which the wastewater from the treatment water tank 80 flows. The wastewater flowing into the distribution tank 11 flows into the wastewater supply tank 21 and is supplied to the line mixer 24, the mixing tank 35, the primary filtration tank 42, And the secondary filtration tank (72). The treated water flowing into the discharge adjustment tank 81 flows into the distribution tank 11 and is discharged to the outside.

The distribution tank 11 has a wastewater inflow chamber 12 for temporarily storing wastewater flowing from the outside and a wastewater inflow chamber 13 defined by the wastewater inflow chamber 12 and the partition 14. The treated water in the effluent control tank 81 flows into the treated water inflow chamber 13 through the treated water guide line 83. The wastewater in the wastewater inflow chamber 12 is discharged from the wastewater inflow chamber 12 through the supply passage 15 connected to the wastewater inflow chamber 12 and supplied to the wastewater flow line 20 connected to the supply passage 15 And flows into the tank 21. The wastewater inflow chamber 12 is provided with a supply passage opening / closing mechanism 16 for opening and closing the supply passage 15. The treated water in the treated water inflow chamber 13 is discharged to the outside through the discharge port 17.

A bypass passage (18) is provided in the partition (14) arranged between the wastewater inflow chamber (12) and the treated water inflow chamber (13). The wastewater in the wastewater inflow chamber 12 can be bypassed to the process water inflow chamber 13 through the bypass passage 18. [ The bypass passage 18 is opened and closed by the bypass passage opening / closing mechanism 19. [ The bypass passage opening / closing mechanism 19 may be manually operated by an administrator or may be automatically operated by various automation devices. When the flow rate of the wastewater flowing into the outside is larger than the treatment flow rate of the water treatment facility 10 or when the water treatment process of the water treatment facility 10 is abnormal, the bypass passage 18 is opened and the wastewater inflow chamber 12 to the treated water inflow chamber 13, the wastewater can be discharged to the outside. Since the wastewater to be bypassed is mixed with the treated water and discharged to the outside, a water treatment effect that reduces the contamination degree of the wastewater can be obtained.

The wastewater in the wastewater inflow chamber 12 of the dispensing tank 11 flows to the wastewater supply tank 21 through the wastewater flow line 20. The wastewater supply tank (21) is provided with a wastewater supply pump (22) for pumping the introduced wastewater to the outside. The wastewater pumped by the wastewater supply pump 22 in the wastewater supply tank 21 flows to the line mixer 24 through the wastewater guide line 23.

When the wastewater flowing from the wastewater supply tank 21 to the mixing tank 35 passes through the line mixer 24, the coagulant and the neutralizing agent are introduced into the wastewater. The flocculant is to flocculate the phosphorus contained in the wastewater, and the neutralizer is to control the pH concentration of the wastewater. When the flocculant is acidic, it is possible to neutralize the wastewater by supplying a basic neutralizing agent. The flow mixer 24 is provided with a flow guide member 25 for guiding the turbulent flow of the wastewater so that the coagulant and the neutralizing agent can be smoothly mixed into the wastewater.

The line mixer 24 is connected to a flocculant supply line 26 for injecting the flocculant and a neutralizer supply line 27 for injecting the neutralizer. The flocculant feed line 26 connects the flocculant feeder 28 and the line mixer 24 and the neutralizer feed line 27 connects the neutralizer feeder 31 and the line mixer 24. The coagulant feeder 28 includes a coagulant storage tank 29 for storing the coagulant and a coagulant feed pump 30 for pumping the coagulant of the coagulant storage tank 29. The neutralizer supply device 31 includes a neutralizer storage tank 32 for storing the neutralizer and a neutralizer feed pump 33 for pumping the neutralizer of the neutralizer storage tank 32.

The wastewater into which the coagulant and the neutralizing agent are introduced flows into the mixing tank 35 while passing through the line mixer 24. The mixing chamber 35 is provided with a primary mixing chamber 36 through which the wastewater passing through the line mixer 24 flows and a secondary mixing chamber 37 through which the wastewater passing through the primary mixing chamber 36 flows . A partition wall 38 is disposed between the primary mixing chamber 36 and the secondary mixing chamber 37 and a plurality of secondary cooling chambers 36, A passage 39 is provided. The primary mixing chamber 36 and the secondary mixing chamber 37 are provided with a coagulant injected into the wastewater and an agitator 40 for diffusing the neutralizing agent into the wastewater. The operation speed of the agitator 40 installed in the primary mixing chamber 36 and the agitator 40 installed in the secondary mixing chamber 37 can be set differently. For example, the agitator 40 of the primary mixing chamber 36 can be operated at a high speed, and the agitator 40 of the secondary mixing chamber 37 can be operated at a low speed. In the mixing tank (35), the reaction between the wastewater and the flocculant is promoted, so that the phosphorus contained in the wastewater is flocculated. The wastewater that has passed through the mixing tank 35 flows into the primary filtration tank 42.

As shown in FIGS. 1 and 2, a first low specific gravity biofilter layer 43a composed of a plurality of low specific gravity floating particulate matter 44a for filtering the aggregated phosphorus in the wastewater is disposed in the primary filtration tank 42, And a plurality of high-boiling particulate floating filter media 44b are disposed on the first high-biofilm biofilter layer 43b. Gravity floating particulate floating material 44b has a larger specific gravity than that of the low specific gravity floating particulate material 44a so that the first high specific gravity biofilter layer 43b is spaced below the first low specific gravity biofilter layer 43a.

The low specific gravity floating particulate materials 44a and the high gravity particulate floating material members 44b constituting the first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b are formed so as to prevent them from being discharged to the outside And is accommodated in a filter chamber 47 between the first upper sieve 45 and the first lower sieve 46. The low specific gravity floating particulate material 44a and the high gravity particulate floating material 44b do not completely fill the filter chamber 47 so that a clearance space can be provided in the filtration chamber 47. [ The first upper sieve 45 and the first lower sieve 46 are provided with a through hole 48 through which the wastewater is passed but the granular floating material 44 is not passed.

The first low specific gravity biofilter layer 43a can simultaneously perform the decomposition process of the organic material contained in the wastewater and the physical filtration process. Many low specific gravity floating particulate materials 44a constituting the first low specific gravity biofilter layer 43a are attached to microorganisms And has a function as a carrier capable of growing. The microorganisms capable of decomposing the organic material adhere to the surface of the low specific gravity floating particulate material (44a) and are able to treat the organic pollutants in the wastewater, as well as to remove the suspended substances at the same time. The low specific gravity particulate floating filter media 44a disposed relatively below the low specific gravity particulate floating filter media 44a forming the first low specific gravity biofilter layer 43a mainly takes charge of the physical filtration function, The low specific gravity floating particulate materials 44a disposed in the low-specific gravity floating particulates 44a are mainly responsible for the biological decomposition function.

The first high specific gravity biofilter layer 43b is disposed under the first low specific gravity biofilter layer 43a, and its function is the same as that of the first low specific gravity biofilter layer 43a. The plurality of high-boiling particulate floating filter media 44b functions as a carrier capable of growing and adhering microorganisms, so that the first high bio-filter layer 43b can perform a physical filtering function and a biological decomposition function .

A first low specific gravity floating filter material 43a composed of low specific gravity floating particulate material 44a and a first high specific gravity floating filter material 43b composed of high specific gravity floating particulate material 44b are disposed inside the primary filtration tank 42, The filtration efficiency for the wastewater can be increased. That is, the wastewater flowing into the primary filtration tank 42 rises through the first lower sieve net 46 and flows through the first high specific gravity biofilter layer 43b and the first low specific gravity biofilter layer 43a, Passes through the upper sieve net 45 and flows toward the secondary filtration tank 72. As the wastewater passes through the first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b, the pollutants in the wastewater and the like, such as phosphorus flocculated, are separated into low specific gravity floating particulate materials 44a and high- (44b).

A first air supply device (50) is installed in the primary filtration tank (42). The first air supply device 50 includes a plurality of diffusers 51 disposed at a lower portion of the first lower sieve mesh 46 and an air distribution pipe 52 for distributing and supplying air to the plurality of diffusers 51 do. The diffuser 51 splits the air supplied through the air distribution pipe 52 into minute bubbles and feeds the wastewater into the wastewater. The air distribution pipe 52 is connected to the air supply line 53. The air supply line 53 is connected to the blower 54 for feeding air and the air supply line 53 An air control valve 55 is provided for regulating the air flow through the air flow control valve. The air supplied to the wastewater in the primary filtration tank 42 by the first air supply device 50 increases the amount of dissolved oxygen in the wastewater and the low specific gravity particulate floating filter medium 44a and the high specific gravity floating particulate filter 44b, Gravity floating particulate material 44a and the high-boiling particulate floating material 44b, thereby to remove contaminants such as aggregates that have adhered to the surfaces of the low specific gravity particulate floating filter medium 44a and the high-density particulate floating filter medium 44b.

The agglomerate that sinks while flowing in the primary filtration tank 42 is precipitated on the sludge guide surface 56 of the primary filtration tank 42 together with other contaminants to form the sludge S. The sludge guide surface 56 is inclined toward the sludge collecting chamber 57 provided at one side of the bottom of the primary filtration tank 42 so that the sludge S of the sludge guide surface 56 moves to the sludge collecting chamber 57, (57). The sludge collecting chamber 57 is provided with a sludge discharge port 58 for discharging the sludge S to the outside of the primary filtration tank 42 and a sludge discharge line 59 is connected thereto. The sludge S discharged from the primary filtration tank 42 through the sludge discharge line 59 flows into the sludge storage tank 60 connected to the sludge discharge line 59. A sludge discharge valve 61 for controlling the flow of the sludge through the sludge discharge line 59 and a sludge S flowing into the sludge discharge line 59 are disposed in the sludge storage tank 60 A sludge pump 62 for forced flow is provided.

A first cleaning device (64) is installed on the upper portion of the primary filtration tank (42). The first cleaning device 64 is connected to the low specific gravity floating particulate material 44a and the high specific gravity particulate floating material 44b constituting the first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b, To remove deposits such as agglomerates adhering to the surfaces of the low specific gravity floating particulate material 44a and the high gravity particulate floating filtrate material 44b by supplying the cleaning liquid to the washing water distribution pipe 65 and a plurality of spray nozzles 66 installed in the wash water distribution pipe 65. The washing water distributing pipe 65 is connected to a washing water supply line 67 for supplying washing water to supply washing water through the washing water supplying line 67. The washing water supplied to the washing water distributing pipe 65 is supplied to a plurality of injection nozzles 66 Weighted particulate floating filter medium 44a and high-density particulate floating filter media 44b. The wash water supply line 67 is connected to the discharge adjustment tank 81 to guide the treated water of the discharge adjustment tank 81 to the wash water distribution pipe 65. The wash water supply line 67 is provided with a wash water control valve 68 for interrupting the flow of wash water.

The first cleaning device 64 increases the amount of pollutants such as agglomerates on the surfaces of the low specific gravity floating particulate material 44a and the high specific gravity floating particulate material 44b and the first low specific gravity biofilter layer 43a or the first When the filtration efficiency of the high-boiling biofilter layer 43b is lowered, the particulate floating materials 44a and 44b are washed to remove the filtration performance of the first low specific gravity biofilter layer 43a or the first high- . The cleaning of the particulate floating media 44a and 44b is performed while the particulate floating media 44a and 44b are exposed to the air. The cleaning process for the particulate floating media 44a and 44b is shown in Fig.

The first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b are formed by completely removing the wastewater from the primary filtration tank 42 or adjusting the water level of the wastewater to be lower than the first lower sieve net 46 The low specific gravity floating particulate materials 44a and the high gravity particulate floating materials 44b are exposed to the air so as to support the first low downstream mesh 46. Then, the washing water is injected toward the particulate floating filters 44a and 44b through the plurality of injection nozzles 66. At this time, the washing water to be sprayed removes adhering substances such as aggregates attached to the first upper sieve 45 and the first lower sieve 46, as well as a plurality of the particulate floating media 44a, 44b.

The pollutants desorbed from the particulate floating media 44a and 44b and the first upper sieve 45 and the first lower sludge 46 are moved to the sludge collecting chamber 57 along the sludge guide surface 56, And is discharged to the outside through the sludge discharge line (59). Contaminants falling on the sludge guide surface 56 which have been separated from the granular floating media 44a and 44b and the first upper sieve 45 and the first lower sieving 46 are smoothly moved toward the sludge collecting chamber 57 A first washing water injection mechanism 69 is provided above the sludge guide surface 56 in the primary filtration tank 42. The first wash water injection mechanism 69 is connected to the wash water supply line 67 and the treated water supplied from the discharge adjustment tank 81 through the wash water supply line 67 is supplied to the sludge And is sprayed onto the guide surface 56. At this time, the pollutant dropped to the sludge guide surface 56 is washed down to the sludge collecting chamber 57 by the washing water injected from the first washing water injecting mechanism 69. The washing water supply line 67 connected to the first washing water injection mechanism 69 is provided with a washing water control valve 70 for controlling washing water flow to the first washing water injection mechanism 69.

In this way, the granular floating media 44a, 44b constituting the first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b, the first upper sieve filter 45 and the first lower sieve filter 46 The wastewater is filled again in the primary filtration tank 42 and the filtration process of wastewater by the first low specific gravity biofilter layer 43a and the first high specific gravity biofilter layer 43b is resumed.

The wastewater subjected to the primary filtration while passing through the primary filtration tank 42 flows into the secondary filtration tank 72. The secondary filtration tank 72 differs from the primary filtration tank 42 only in the arrangement position and size of the wastewater flow path. The specific structure, internal installation components, and functions are the same as those of the primary filtration tank 42 . Hereinafter, the same reference numerals are assigned to the same components as those of the above-described first filtration tank 42, and detailed descriptions and specific explanations thereof are omitted or simplified.

A second low specific gravity biofilter layer 73a composed of a plurality of low specific gravity floating particulate materials 44a for filtering the aggregated phosphorus in the wastewater is disposed in the secondary filtration tank 72 and a plurality of high- And a second high-boiling bio-filter layer 73b made of a high-boiling bio-filter layer 73b. The low specific gravity floating particulate materials 44a constituting the second low specific gravity biofilter layer 73a and the high gravity particulate floating materials 44b constituting the second low specific gravity biofilter layer 73a are prevented from being discharged to the outside And is received in the filter chamber 76 between the second upper sieve screen 74 and the second lower sieve screen 75. The low specific gravity floating particulate material 44a and the high gravity particulate floating material 44b are not completely filled in the filtration chamber 76 so that a clearance is provided in the filtration chamber 76. [ The second upper sieve 74 and the second upper sieve 74 are provided with through holes 48 for passing the wastewater and not allowing the particulate floating media 44a, 44b to pass through.

The second low specific gravity biofilter layer 73a and the second high specific gravity biofilter layer 73b can simultaneously perform the decomposition process of the organic material contained in the wastewater and the physical filtration process. The low specific gravity floating particulate material 44a and the high specific gravity particulate floating material 44b constituting the second low specific gravity biofilter layer 73a and the second high specific gravity biofilter layer 73b have only a difference in specific gravity, And has a function as a carrier capable of growing. The low specific gravity floating particulate material 44a constituting the second low specific gravity biofilter layer 73a and the high gravity particulate floating material 44b constituting the second high specific gravity biofilter layer 73b are the same as those described above, A detailed description thereof will be omitted.

The wastewater flowing into the secondary filtration tank 72 rises through the second lower sieve netting 75 and flows through the second upper sieve netting net 73a via the second high specific gravity biofilter layer 73b and the second low specific gravity biofilter layer 73a. 74, and the contaminants in the wastewater and the like, such as phosphorus, which are aggregated when the wastewater passes through the second high specific gravity biofilter layer 73b and the second low specific gravity biofilter layer 73a, And is removed.

The second filtration tank 72 is provided with a second air supply device 77. The second air supply device 77 includes a plurality of diffusers 51 disposed below the second lower sieve screen 75 and an air distribution pipe 52 for distributing the air to the plurality of diffusers 51. The air distribution pipe 52 is connected to the blower 54 through an air supply line 53 and an air control valve 55 is installed in the middle of the air supply line 53. The specific structure and operation of the second air supply device 77 are the same as those of the first air supply device 50 described above.

The agglomerates flowing and sinking in the secondary filtration tank 72 are precipitated in the sludge guide surface 56 of the secondary filtration tank 72 together with other contaminants to form the sludge S. The sludge guide surface 56 is inclined toward the sludge collecting chamber 57 provided at one side of the bottom of the secondary filtration tank 72 so that the sludge S of the sludge guide surface 56 moves to the sludge collecting chamber 57, (57). The sludge collecting chamber 57 is provided with a sludge discharge port 17 for discharging the sludge S to the outside of the secondary filtration tank 72, and a sludge discharge line 59 is connected thereto. The sludge S discharged from the secondary filtration tank 72 through the sludge discharge line 59 flows into the sludge storage tank 60 connected to the sludge discharge line 59. A sludge discharge valve (61) is provided in the middle of the sludge discharge line (59) for controlling the flow of the sludge through the sludge discharge line (59).

A second cleaning device (78) is installed on the upper portion of the secondary filtration tank (72). The second cleaning device 78 supplies washing water to the particulate floating filter media 44a and 44b constituting the second low specific gravity biofilter layer 73a and the second high specific gravity biofilter layer 73b, 44a, and 44b, and is provided with a washing water distributing pipe 65 disposed on the second upper sieve screen 74 and a plurality of nozzles (not shown) provided on the washing water distributing pipe 65, And includes a nozzle 66. The wash water distribution pipe 65 is connected to a wash water supply line 67 for supplying wash water and a wash water control valve 68 for controlling the flow of wash water is installed in the wash water supply line 67.

 The second cleaning device 78 increases the amount of foreign matter such as agglomerated particles on the surface of the particulate floating filters 44a and 44b so that the concentration of the foreign particles in the second low specific gravity biofilter layer 73a or the second high specific gravity biofilter layer 73b The particulate floating media 44a and 44b are washed to lower the filtration performance of the second low specific gravity biofilter layer 73a and the second high specific gravity biofilter layer 73b. The action of the second cleaning device 78 and the cleaning method for the particulate floating materials 44a and 44b are the same as those of the first cleaning device 64 described above.

And the second upper sieve filter 74 and the second lower sieve filter 75 constitute the second low specific gravity biofilter layer 73a and the second high specific gravity biofilter layer 73b, A second washing water injection mechanism 79 is provided above the sludge guide surface 56 in the secondary filtration tank 72 to smoothly move contaminants falling on the sludge guide surface 56 toward the sludge collecting chamber 57. The second wash water injection mechanism 79 is connected to the wash water supply line 67 and the treated water supplied through the wash water supply line 67 is sprayed onto the sludge guide surface 56 through the second wash water injection mechanism 79 And the pollutant dropped to the sludge guide surface 56 is washed away toward the sludge collecting chamber 57. The washing water supply line 67 connected to the second washing water injection mechanism 79 is provided with a washing water control valve 70 for interrupting washing water flow to the second washing water injection mechanism 79.

As described above, the treated water having passed through the primary filtration tank 42 and the secondary filtration tank 72 is temporarily stored in the treatment water tank 80 and then flows into the discharge adjustment tank 81. The effluent control tank 81 is provided with a process water supply pump 82 for transporting the treated water stored therein through the wash water supply line 67. A part of the treated water of the discharge adjustment tank 81 is supplied to the primary filtration tank 42 and the secondary filtration tank 72 through the wash water supply line 67 and used for cleaning, To the treated water inflow chamber (13) of the dispensing tank (11). The treated water flowing into the treated water inflow chamber 13 of the distribution tank 11 is discharged to the outside through the discharge port 17.

As described above, the water treatment facility 10 according to the present invention is characterized in that the wastewater flowing from the outside is passed through the line mixer 24 and the coagulant and the neutralizing agent are introduced into the wastewater, The primary filtration tank 42 in which the phosphorus contained in the wastewater is flocculated and the biofilter layers 43 and 73 composed of the plurality of particulate floating filter media 44 are provided and the plurality of particulate floating filter media 44 The filtration process is performed on the contaminants such as agglomerates in the wastewater and the like in a secondary filtration tank 72 equipped with the biofilter layers 43 and 73 constituted by the filtration process. Therefore, phosphorus and other pollutants in the mixer wastewater can be effectively treated.

The water treatment facility 10 according to the present invention further includes a granular floating filter material 44a (43a, 43b) constituting the biofilter layers 43a, 43b, 73a and 73b provided in the filtration tanks 42, 44b are used as washing water for washing, efficient operation is possible and operation cost can be reduced.

The water treatment facility 10 according to the present invention temporarily stores the treated water in the treated water inflow chamber 13 of the distribution tank 11 provided with the wastewater inflow chamber 12 from which wastewater flows from the outside, And the wastewater inflow chamber 12 and the process water inflow chamber 13 are connected to each other by a bypass passage 18 which is opened and closed by a bypass passage opening and closing mechanism 19. [ Therefore, when the flow rate of the wastewater flowing outside the mixer exceeds the treatment flow rate of the water treatment facility 10 or when the water treatment process of the water treatment facility 10 is abnormal, the bypass passage 18 is opened and the wastewater By bypassing the wastewater in the chamber 12 to the treated water inflow chamber 13, the wastewater can be mixed with the treated water and discharged to the outside, whereby the pollution degree of the wastewater discharged to the outside can be lowered even in an emergency situation.

3 shows another embodiment of the filtration tank provided in the water treatment facility according to the present invention.

The filtration tank 85 shown in Fig. 3 is provided with one biofilter layer 43 composed of one kind of particulate floating filter medium 44 as compared with the above-described primary filtration tank 42, And a granular floating media cleaning mechanism 86 capable of wiping off the granular floating media. Other components other than the particulate floating filter cleaning mechanism 86 provided in the filtration tank 85 are as described above.

The particulate floating media cleaning mechanism 86 includes a brush 87 installed in the filter chamber 47 between the first upper sieve 45 and the first lower sieve 46 and a brush motor 87 for moving the brush 87 Device 90 as shown in FIG. The brush 87 includes a brush support member 89 rotatably disposed in the filter chamber 47 and a plurality of brush bristles 88 coupled to the brush support member 89. The brush 87 is used to clean the granular floating media 44 constituting the biofilter layer 43 so that the water level of the wastewater in the filter chamber 47 is lowered so that the granular flocculant media 44 are separated from the first lower filtering net 46 Adjacent to the first lower sieve net 46 in the filter chamber 47 so as to be buried in the granular floating media 44 when they are stacked on the upper and lower sieve floors 44.

The brush support member 89 is engaged with the driving shaft 91 of the brush exercise device 90. When the brush exercise device 90 is operated, the brush 87 supports the granular floating media (44). At this time, the bristles 88 of the brush 87 are in frictional contact with the particulate floating filter medium 44 to wipe off the contaminants adhering to the particulate floating filter medium 44 and to desorb them from the particulate floating filter medium 44. The cleaning operation of the particulate floating filter medium 44 by the brush 87 proceeds together with the cleaning operation by the first cleaning device 64 so that the efficiency of removing contaminants from the particulate floating filter medium 44 can be further increased .

In the present invention, the specific configuration of the particulate floating filter medium cleaning mechanism 86 is not limited to the illustrated one and can be variously changed. For example, the specific structure and installation number of the brush support member 89, the coupling structure of the brush support member 89 and the brush bristles 88, the specific structure of the brush movement device 90, And the brush exercise device 90 may be variously modified. The brush movement support member 89 is moved in the granular floating media 44 such that the brush movement support member 89 linearly reciprocates without rotating the brush support member 89, A variety of moveable devices can be used. The particulate floating filter medium cleaning mechanism 86 may be applied not only to the primary filtration tank 42 but also to the secondary filtration tank 72 described above.

Meanwhile, FIG. 4 shows another embodiment of the filtration tank provided in the water treatment facility according to the present invention.

The filtration tank 92 shown in Fig. 4 is different from the above-described primary filtration tank 42 in that one biofilter layer 43 composed of one kind of particulate floating filter media 44 is provided, And a cleaning device 93 of another structure for cleaning the cleaning liquid. Components other than the cleaning device 93 provided in the filtration tank 92 are as described above.

The cleaning device 93 is for removing washing water adhered to the surface of the particulate floating filter medium 44 by supplying washing water to the particulate floating filter media 44 constituting the biofilter layer 43. The cleaning device 93 includes a washing water distributing pipe 94 rotatably installed in the filter chamber 47 between the first upper filtering net 45 and the first lower filtering net 46, A washing water guide pipe 97 connected to the washing water distributing pipe 94 for supplying wash water to the washing water distributing pipe 94 and a washing water guide pipe 97 connected to the washing water distributing pipe 94, 97 to move the washing water distribution pipe 94. The washing water distributing pipe moving device 98 includes:

The wash water guide pipe 97 is rotatably coupled to the wash water distributor motion device 98 and connected to the wash water supply line 67 through the flow guide mechanism 99. The flow guide mechanism 99 supplies wash water supplied through the wash water supply line 67 to the wash water guide pipe 97 rotated by the wash water distribution pipe exercise device 98. As the flow guide mechanism 99, a fluid connection mechanism having various structures that can stably supply the wash water to the wash water guide pipe 97 while the wash water guide pipe 97, such as a rotary joint, is rotating can be used.

The washing water distribution pipe 94 is formed in such a manner that the water level of the wastewater is lowered in the filter chamber 47 to clean the particulate floating media 44 constituting the biofilter layer 43, (46) in the filter chamber (47) so as to be buried in the particulate floating media (44) when they are stacked on the filter cloth (46). When the water level of the wastewater is lowered and the granular floating media 44 are piled up on the first lower sieve 46, the washing water distribution pipe exercise device 98 operates so that the washing water distributing pipe 94 flows into the granular floating media 44 The pollutants adhering to the particulate floating filter medium 44 are washed away by the washing water sprayed from the spray nozzle 95. In this case, the washing water is sprayed through the plurality of spray nozzles 95 while rotating. The washing water distribution pipe 94 rotates while the washing water is sprayed from the spray nozzle 95 so that the washing water distributing pipe 94 and the plurality of spray nozzles 95 come into frictional contact with the particulate floating filters 44, And is stirred by the distribution pipe 94 and the plurality of injection nozzles 95. Therefore, the efficiency of removing contaminants from the mixer particulate floating filter medium 44 can be increased.

The specific configuration of the cleaning device 93 is not limited to that shown and can be variously changed. For example, the specific structure of the washing water distribution pipe 94, the installation number of the washing water distribution pipe 94, the number of the spray nozzles 95, the structure of the washing water distribution pipe 94 and the structure of the washing water distribution pipe exercise device 98, The connection structure of the washing water distribution pipe 94 and the washing water distribution pipe exercise device 98 and the connection structure of the washing water guide pipe 97 and the washing water supply line 67 may be variously changed. The washing water distributing pipe exercise device 98 moves the washing water distributing pipe 94 in the granular floating media 44 such that the washing water distributing pipe 94 reciprocates linearly without rotating the washing water distributing pipe 94 A variety of apparatuses can be used. The characteristic features of the cleaning device 93 can be applied to the second cleaning device 78 installed in the secondary filtration tank 72 as it is.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and modify the technical idea of the present invention in various forms. Therefore, the mixer, such improvements and modifications will fall within the scope of the present invention as long as it is obvious to those skilled in the art.

10: Water treatment facility 11: Distribution tank
12: wastewater inflow chamber 13: treated water inflow chamber
16: Supply passage opening / closing mechanism 18: Bypass passage
19: bypass passage opening / closing mechanism 20: wastewater flow line
21: Waste water supply tank 22: Waste water supply pump
23: wastewater guide line 24: line mixer
26: coagulant feed line 27: neutralizer feed line
28: coagulant feeder 31: neutralizer feeder
35: Mixing tank 36: Primary mixing room
37: Second mixing room 40: Stirrer
42: primary filtration tank
43a, 73a: first and second low specific gravity biofilter layers
43b, 73b: first and second high-boiling biofilter layers
44a: Low specific gravity floating granular material 44b: High granular floating granular material
45, 74: first and second upper sieve cloths 46, 75: first and second lower sieve cloths
47, 76: Fruit room 50, 77: First and second air supply devices
51: diffuser 52: air distribution pipe
53: air supply line 56: sludge guide surface
57: Sludge collecting chamber 59: Sludge discharge line
60: sludge storage tank 64, 78: first and second cleaning apparatus
65, 94: wash water distribution pipe 66, 95: injection nozzle
67: wash water supply line 69, 79: first and second wash water injection mechanism
72: secondary filtration tank 80: treated water tank
81: discharge control tank 82: treated water supply pump
83: treated water guidance line 85, 92: filtration tank
86: Granular floating media cleaning device 87: Brush
88: Brush member 89: Brush member supporting member
90: Brush motion device 91: Drive shaft
93: First cleaning device 97: Cleaning water guide pipe
98: wash water distribution pipe exercise device 99: flow guide device

Claims (9)

A wastewater supply tank for storing wastewater;
A line mixer installed in the middle of the wastewater guide line through which the wastewater supplied from the wastewater supply tank flows;
A flocculant supply device for providing flocculant to the line mixer;
A neutralizer supply device for supplying a neutralizer to the line mixer;
A mixing tank through which the wastewater passing through the line mixer flows;
A stirrer installed in the mixing tank to diffuse the coagulant and the neutralizer introduced into the wastewater into the wastewater in the line mixer;
A first low specific gravity biofilter layer composed of a plurality of low specific gravity floating particulate filter media for introducing wastewater passing through the mixing tank and filtering the aggregated phosphorus in the wastewater; A first high specific gravity biofilter layer made of a middle particulate floating filter material and spaced apart from a lower portion of the first low specific gravity biofilter layer; and a second high specific gravity floating filter material passing through the plurality of low specific gravity floating particulate filter media and the plurality of high- A first filtration tank having a plurality of through holes to allow the first low specific gravity biofilter layer and the first low specific gravity biofilter layer and the first high filtration biofilter layer and the first high filtration biofilter layer and the first bottom filtration net respectively;
A first air supply device having a plurality of diffusers disposed under the first high-cost bio-filter layer to supply air to wastewater in the primary filtration tank;
When the water level of the wastewater is lowered in the primary filtration tank so that the plurality of low specific gravity floating particulate floors and the plurality of high specific gravity floating particulate floors are supported by the first lower filtration net, A first cleaning device having a plurality of injection nozzles disposed on the first upper sieve to supply wash water for washing the particulate floating filter medium of the high boiling point;
A sludge discharge line connected to the primary filtration tank for discharging sludge settled in the primary filtration tank to the outside of the primary filtration tank;
And a treatment water inflow chamber partitioned by the wastewater inflow chamber through the partition wall disposed between the wastewater inflow chamber and the treatment water inflowed through the primary filtration tank, the wastewater inflow chamber for temporarily storing wastewater flowing from the outside, ;
A wastewater flow line for introducing wastewater from the wastewater inflow chamber into the wastewater supply tank;
A processing water guide line for allowing the treated water having passed through the primary filtration tank to flow into the treated water inflow chamber;
An outlet connected to the treated water inflow chamber;
A bypass passage provided in the partition so that wastewater in the wastewater inlet chamber can be bypassed to the processing water inlet chamber; And
And a bypass passage opening / closing mechanism for opening / closing the bypass passage.
The method according to claim 1,
Further comprising a treatment water supply pump installed in the discharge adjustment tank for storing the treatment water passed through the primary filtration tank and supplying the treatment water of the discharge adjustment tank to the spray nozzles of the first cleaning device.
The method according to claim 1,
Wherein the mixing chamber is provided with a primary mixing chamber through which the wastewater passing through the line mixer flows directly and a secondary mixing chamber through which the wastewater of the primary mixing chamber is introduced through a passage provided in a partition wall disposed between the primary mixing chamber, Wherein a plurality of the agitators are disposed in the primary mixing chamber and the secondary mixing chamber, respectively.
The method according to claim 1,
The primary filtration tank is provided with a sludge collection chamber provided with a sludge discharge port to which the sludge discharge line is connected and a sludge guide surface inclined toward the sludge collection chamber to guide the sludge settled in the primary filtration tank to the sludge collection chamber Features water treatment facilities.
5. The method of claim 4,
Further comprising a washing water injection mechanism installed in the primary filtration tank so that sludge accumulated on the sludge guide surface can be washed away toward the sludge collecting chamber by spraying washing water toward the sludge guide surface.
The method according to claim 1,
The first cleaning device includes:
A washing water distribution pipe installed between the first upper sieve and the first lower sieve net to support the plurality of syringe nozzles,
A wash water guide pipe connected to the wash water distribution pipe to supply wash water to the wash water distribution pipe,
And a washing water distribution pipe exercise device for moving the washing water distribution pipe through the washing water guide pipe.
delete The method according to claim 1,
When the water level of the wastewater is lowered in the primary filtration tank so that the plurality of low specific gravity floating particulate floors and the plurality of high specific gravity floating particulate floors are supported by the first lower filtration net, A brush disposed between the first upper sieve mesh and the first lower sieve mesh to wipe the granular floating sorbent material of the high aspect ratio; And
And a brush movement device for moving the brush.
The method according to claim 1,
A second low specific gravity biofilter layer composed of a plurality of low specific gravity floating particulate filter materials for introducing the wastewater passing through the primary filtration tank and filtering the aggregated phosphorus in the wastewater; A second high specific gravity biofilter layer composed of a plurality of high gravity floating particulate filter media having a specific gravity larger than that of the particulate floating filter media and spaced apart from a lower portion of the second low specific gravity biofilter layer; Wherein the plurality of low specific gravity floating filter media constituting the first high specific gravity biofilter layer and the plurality of low density gravity floating filter media constituting the second high specific gravity biofilter layer and the plurality of high gravity particulate floating filter media constituting the second high specific gravity biofilter layer, A secondary filtration tank having a second upper sieve net and a second lower sieve net disposed respectively below the high specific gravity biofilter layer;
A second air supply device having a plurality of diffusers disposed under the second bio filter layer to supply air to the wastewater in the second filtration tank;
The water level of the wastewater in the secondary filtration tank is lowered so that the plurality of low specific gravity floating particulate matter constituting the second low specific gravity biofilter layer and the second high specific gravity biofilter layer and the plurality of high- Wherein the plurality of low specific gravity floating particulate material constituting the second low specific gravity biofilter layer and the second high specific gravity biofilter layer and the washing water for washing the plurality of high specific gravity particulate floating material are supplied when supported on a lower sieve net A second cleaning device having a plurality of spray nozzles disposed on the second upper sieve screen; And
And a sludge outlet provided in the secondary filtration tank to discharge the sludge settled in the secondary filtration tank to the outside of the secondary filtration tank.

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