KR20170029853A

KR20170029853A - Phosphorus removal system of waste water treatment

Info

Publication number: KR20170029853A
Application number: KR1020150126955A
Authority: KR
Inventors: 최영근; 선명찬; 이길재
Original assignee: 주흥환경(주)
Priority date: 2015-09-08
Filing date: 2015-09-08
Publication date: 2017-03-16

Abstract

The present invention relates to a detoxification system for a waste water treatment capable of simultaneous regeneration and disinfection during filtration adsorption.
An upflow filtration adsorber comprising a filtration tank, a distribution outlet tube, an air lift tube, a reverse osmosis chamber, and a regeneration section, wherein the upflow filtration adsorber includes an upflow filtration adsorber having an upflow filtration adsorber And a regeneration solution for regeneration and disinfection is injected into the lower portion of the air lift tube while the filtration adsorbent rises.
According to the untreated water removal system of the present invention, it is unnecessary to adjust the pH, the disinfection of the inside of the apparatus is performed at the same time, the final discharge water is also disinfected, the disinfection facility is unnecessary and the coagulant is not used. And the adsorption and regeneration of phosphorus are simultaneously performed, disinfection of the treated water is simultaneously performed, the amount of reverse water is very low, the regeneration efficiency is high, and the size (height) of the filter is reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste water treatment system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detoxification system for sewage waste water treatment, and more particularly, to a detoxification system for sewage waste water treatment capable of simultaneous regeneration and disinfection during filtration.

In recent years, due to recent economic growth, industrial development and improvement of living standards, the amount of sewage wastewater such as domestic sewage, industrial wastewater and livestock wastewater has been rapidly increasing, and such wastewater has flowed into the lake and river, It is polluting the water quality enough to seriously damage the habitat.

The organic substances such as suspended substances and nutrients, which are abundantly contained in the waste wastewater, promote the growth and growth of algae, thereby promoting eutrophication of the lake and river. The phosphorus in the nutrient is required as an essential constituent in all living organisms, The amount of water present in the form is very small, and it acts as a limit material in red tide and eutrophication, and thus it is attracting attention as a main factor of water pollution. Nitrogen is released mainly into organic nitrogen and ammonia nitrogen form and released into the environment. After it is released into the environment, it is converted into nitrite by microorganisms and then converted into nitrate. In this process, a very large oxygen demand is required, do. Phosphorus and nitrogen contained in sewage wastewater are the main cause of destruction of ecosystem, and it is necessary to remove the pollutant in advance because the destroyed ecosystem is almost impossible to recover or requires much time and cost for recovery have.

Generally, the lower wastewater treatment system for the lower wastewater treatment sequentially arranges the multistage filters so that nitrogen, phosphorus, BOD, COD and suspended solids (SS) are removed as the lower wastewater passes through each filter.

Among the filters disposed in such a sewage treatment system, an upward flow type sand filter disclosed in Korean Patent Registration No. 10-0501522 employs an upward flow cleaning method to filter the filter media, and simultaneously performs filtration of the inflow wastewater (or inflow water) Which can be used in a variety of ways such as sewage treatment, recycling of agricultural and industrial wastewater, and desalination.

However, the upflow sand filter disclosed in Korean Patent No. 10-0501522 is effective in removing the suspended solids (SS), but has a disadvantage that denitrification of the influent water and removal of phosphorus are not performed. In addition, the upflow type sand filter disclosed in Korean Patent No. 10-0501522 adopts a structure in which the zigzag flow path of the sand washing section has a larger outer diameter than the upper part in order to improve the cleaning ability of the sand, However, due to such a structure, the suspended solids (SS) attached to the falling sand are not properly removed, and the suspended solids (SS) are mixed and discharged to the discharged purified water.

Korean Patent Laid-Open Publication No. 2013-0031477 discloses a filtration apparatus for a filtration apparatus for filtration of phosphorus and suspended solids (SS), in particular, an upflow continuous filter having an improved structure capable of improving the denitration reaction of influent water, And a wastewater treatment system.

In Korean Patent Laid-Open Publication No. 2013-0031477, the upflow continuous filter 10 is operated by the upflow principle, as shown in Fig. The inflow water to be treated flows into the lower end portion of the filtration tank 11 through the inflow pipe 13a and the distribution pipe 13. The inflow water passes through the filtration layer 12 in an upward flow, and the cleaned water is discharged through the upper discharge pipe 11a. At this time, the contaminants are left in the filtration layer 12. The contaminated filter medium passes through the outer tube 15a of the air lift tube 15 and the compressed air supplied from the first compressor 20 flows from the lower portion of the inner tube 15b And is collected in the washing water chamber 16 together with the washed washing water. The washed water is discharged from the washing water chamber 16 through the washing water discharge pipe 17 and the primary washed material is dropped through the washing passage 19a to be secondarily cleaned and then the filtration layer 12 And the polluting sources lighter than the filtering medium are discharged to the outside together with the washing water through the washing water discharge pipe 17.

At this time, fine bubbles are generated by the air supplied from the second compressor 30 to the micro-bubble generating member 14 provided in the cleaning flow passage 19a, and the filter material dropping on the cleaning flow passage 19a is brought into contact with the micro- The filter media is cleaned more cleanly.

2, a mixing device 40 is installed on the current side of the upflow type continuous filter 10, and a mixing device 40 is provided on the mixing device 40. In this case, The carbon source stored in the storage unit 50 is supplied by the carbon source supply pump and the medicine (coagulant) stored in the medicine storage unit 60 is supplied by the medicine supply pump. The mixing device 40 is a reactor installed to promote mixing and reaction of influent and external carbon sources or influent and chemicals (flocculant) and induces strong turbulence to induce mixing during a short residence time. Thus, the influent water mixed with the carbon source and the chemical flows into the upflow continuous filter 10.

At this time, the carbon source supplied to the upflow-type continuous filter 10 serves to smooth the formation of microorganisms on the filter material surface of the filter layer 12. In addition, the chemical supplied to the upflow-type continuous filter 10 reacts with the dissolved phosphorus present in the influent water to generate insoluble compounds, and the insoluble phosphorus compound thus formed is filtered by the filter medium layer 12, It is possible to remove phosphorus.

However, when removing phosphorus in a sewage water treatment system having an upflow type continuous filter constructed as described above, a flocculant (medicine) is necessarily used. As a result of applying the flocculant to the treated water in the immersion separation membrane (MBR) The floc (flocc) was not formed, but was introduced into the upflow type continuous filter. When the sand in the upflow type continuous filter was washed, the flocculant was not easily desorbed and was reduced, so that the filter was contaminated. Finally, It was confirmed that there was a problem of re-contamination due to the efflux of suspended matter (suspended matter).

Membrane Bio-Reactors (MBR) is a feature of treated water with almost no Suspended Solids (SS). Due to lack of nucleation, floc is not formed well, and fine flocs flow out during filtration. There is a problem in that the quality of the water is rather deteriorated.

Therefore, when phosphorus is removed in a conventional wastewater treatment system equipped with an upflow type continuous filter, the use amount of the flocculant is increased when MBR and suspended solids of the treated water are very low. As a result, It shows a vicious circle which is not completely removed during washing but flows out in the process.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to overcome the problem caused by lack of coagulation nucleus by not using a coagulant and to simultaneously perform adsorption and regeneration of phosphorus, And to provide a detoxification system for wastewater treatment.

Another object of the present invention is to provide a disinfection system which can reduce the size (height) of the filter and simplify the treatment of the sewage waste water because the disinfection facility is not needed, .

The system for removing sewage water according to an embodiment of the present invention is a dehulling system for sewage wastewater treatment including an upflow filtration adsorber for introducing and filtering influent water, wherein the upflow filtration adsorber is a system in which an adsorbent A distribution outlet pipe for distributing the inflow water introduced into the filtration tank to the mixed filtration layer and discharging the inflow water introduced into the filtration tank; and a discharge pipe installed inside the filtration tank, An air lift tube which is cleaned by reverse osmosis, an inverted wash chamber which is installed on the upper part of the air lift tube and collects the adsorbent and sand and backwash water which is washed, a regenerated water absorbent which is installed on the lower side of the reverse osmosis chamber, And a regeneration section for reducing the adsorbent material to the filtration layer, Inject the regeneration solution to disinfect.

The adsorbent is a porous ceramic material. At least one of calcium oxide, iron oxide, iron sulfate, iron chloride, aluminum sulfate, calcium sulfate, and calcium fluoride may be added to the adsorbent. The porous ceramic material has a diameter of 0.5 to 1 mm and pores having a diameter of 0.01 탆 to 1 탆 formed therein.

The regeneration solution uses chlorine dioxide water. The regeneration solution is a solution in which chlorine dioxide is mixed with the final treated water.

Sodium carbonate (Na ₂ CO ₃ ) or sodium hydrogencarbonate (NaHCO ₃ ) may be added to the regeneration solution. The mixing ratio of the adsorbent and the sand is preferably 1: 1 by volume.

According to the descaling system of sewage waste water treatment according to the present invention, chlorine dioxide is used to regenerate the mixed filtration layer without using an aggregating agent by mixing an adsorbent in the filtration layer and adjusting the pH of the conventional regeneration technology (alkali regeneration method) It is unnecessary and the sterilization and disinfection of the inside of the apparatus are performed at the same time, and the final discharge water is also sterilized and disinfected. That is, the detoxification system of the present invention overcomes the problem due to the lack of coagulation nucleus and does the simultaneous adsorption and regeneration of phosphorus and disinfection of treated water without using a coagulant.

In addition, in the descaling system of the present invention, the chlorine dioxide water as the regeneration solution is sprayed to the air lift tube for transferring the filtrate adsorbent that needs regeneration to the upper part in the lower part of the upflow filtration adsorber, The regenerating efficiency is high, the size (height) of the filter is reduced, and the disinfection facility is not needed, so that the waste water treatment can be simplified.

On the other hand, chlorine dioxide which is a regenerating solution in the undiluted system of the present invention can be used simultaneously as a cleaning solution for an immersion separation membrane of a separate treatment facility, and can be used for reducing the odor of a sewage facility.

1 is a configuration diagram showing a conventional upflow type continuous filter.
2 is a configuration diagram showing a sewage waste water treatment system having a conventional upflow type continuous filter.
Fig. 3 is a configuration diagram showing a detoxification system for a waste water treatment according to an embodiment of the present invention.
Fig. 4 is a diagram showing the configuration and operation state of the upflow filtration adsorber of Fig. 3;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

FIG. 3 is a structural view showing a descaling system of sewage waste water treatment according to an embodiment of the present invention, and FIG. 4 is a view showing the construction and operation state of the upflow filtration adsorber of FIG. In the descaling system for descaling wastewater treatment according to the embodiment of the present invention, the descaling system for the treated water of the separation membrane technique (MBR) will be described as an example. It is needless to say that the treatment water having a very low amount of suspended substances such as the final discharge water of the sewage treatment facility, that is, In the following description, the treated water flowing into the upflow filtration adsorber is referred to as an " influent water ", and the treated water treated by sand and the adsorbent and the regeneration solution (chlorine dioxide water) And the treated water which is washed together with the regeneration solution so as to regenerate the sand and the adsorbent while rising together with the regeneration solution is referred to as " reverse osmosis ".

As shown in the drawing, the descaling system of the waste water treatment according to the embodiment of the present invention includes an upward flow filtration adsorber 100 into which the influent water flows, and the upward flow filtration adsorber 100 includes a filtration tank 110 and a distribution discharge pipe 120, an air lift tube 130, a reverse osmosis chamber 140, and a regeneration unit 150.

The upflow filtration adsorber 100 is a device for adsorbing and removing phosphorus from suspended solids in a mixed filtration layer of sand and adsorbent without using a flocculant for influent water, .

The filtration tank 110 is provided therein with a mixed filtration layer 111 filled with a filter sorbent material mixed with an adsorbent to be removed from the filtration sand. An inlet pipe 112 through which the inflow water flows is provided at one side of the upper portion of the filtration tank 110 and a discharge pipe 113 through which the deoxidation treated water (final treated water) is discharged is provided on the other side of the upper portion of the filtration tank 11 . A mixed filtration layer 111 is formed in the lower side of the filtration tank 110. A filtration adsorbent (adsorbent and sand) regenerated in the regeneration section 150 and a treatment The water layer 114 is formed. At this time, the regenerated filtrate adsorbent material is collected in the lower part of the treated water layer 114, and the deionized water collects in the upper part of the treated water layer 114 and is discharged as the final treated water through the discharge pipe 113.

The inflow water is pumped through the inflow tank 161 or the inflow pump 162 at the primary treatment facility and flows into the inflow pipe 112.

The height of the filtration tank 110 is 1.5 m to 2.5 m, the height of the mixed filtration layer 111 is 1 to 2 m, and the height of the treated water layer 114 is 0.5 m. Conventionally, the upflow type continuous filter or the sand filter is constructed such that the filtration layer is made of sand and the coagulant for dehulling must be used and the height of the filtration layer should be at least 5 m due to the problem of the coagulation nucleus of the coagulant, It was difficult to apply it to a small scale sewage treatment plant. On the other hand, the upflow filtration adsorber 100 of the present invention has a structure in which the mixed filtration layer 111 is formed of a double mixed layer of sand and adsorbent and does not require a coagulant, so that there is no problem of coagulation of the coagulant and the adsorption rate of the filtration is fast. Can be reduced to two or more times. The mixed filtration layer 111 is preferably formed by mixing the sand and the adsorbent at a volume ratio of 1: 1. The mixing ratio can be varied in the range of 1 to 1.5, i.e., 1: 1.5 or 1.5: 1.

The adsorbent is a porous ceramic material which adsorbs and removes phosphorus contained in the influent water, and the adsorbent may be added with at least one of calcium oxide, ferric oxide, iron sulfate, ferric chloride, aluminum sulfate, calcium sulfate and calcium fluoride. The porous ceramic material has a diameter of 0.5 to 1 mm and pores having a diameter of 0.01 탆 to 1 탆 formed therein. The sand may include a filter material such as an anthracite or a porous cray, and is the same as a filter material used in a conventional upflow type continuous filter or a sand filter.

The inflow water flowing through the inflow pipe 112 passes through the mixed filtration layer 111 and is moved upward to remove contaminants, and then the untreated water (final treated water) is discharged through the discharge pipe 113.

The distribution discharge pipe 120 distributes the inflow water introduced through the inflow pipe 112 to the mixed filtration layer 111 and discharges it. The distribution discharge pipe 120 is connected to the inflow pipe 112 through the inflow water pipe 112a and is disposed below the filtration tank 110 so that the inflow water flowing into the lower inside of the filtration tank 110 is discharged to the mixing filtration layer 111). The distribution outlet pipe 120 is radially formed into a plurality of holes so that the inflow water introduced into the filtration tank 110 spreads evenly in the lower portion of the inside of the filtration tank 110 to be well distributed to the mixed filtration layer 111.

The air lift tube 130 is installed at the inner center of the filtration tank 110 in the longitudinal direction and is cleaned by reverse osmosis while the adsorbent and sand of the mixed filtration layer 111 are raised according to the air supply. The regeneration solution for regeneration and disinfection is injected into the lower portion of the air lift tube 130 through the injection pipe 172 together with the compressed air supplied from the compressor 171 while the contaminated filter adsorbent (adsorbent and sand) rises. An air lift pump (173) for purging contaminated filter adsorbent (adsorbent and sand) is installed at the lower end of the air lift tube (130).

The regeneration solution uses chlorine dioxide water. The chlorine dioxide water (regeneration solution) uses a solution in which chlorine dioxide (ClO ₂ ) is mixed with the final treated water. Sodium carbonate (Na ₂ CO ₃ ) or sodium hydrogencarbonate (NaHCO ₃ ) may be added to the regeneration solution. The concentration of chlorine dioxide water is preferably 30 mg / L or less. A solution of sodium hypochlorite (NaOCl) may also be used as the regeneration solution.

As a result of the regeneration of the regenerating solution, the regeneration efficiency of the filtrate adsorbent was about 20% as a result of regeneration with 10 mg / L of chlorine dioxide solution, and the regeneration efficiency of the filtrate adsorbent was about 30% as a result of regeneration with sodium hypochlorite solution 3 to 10 mg / As a result, it was confirmed that the regeneration efficiency of the filtrate adsorbent can be up to about 30% as a result of regeneration with 10 mg / L of a solution containing sodium carbonate or sodium bicarbonate added to chlorine dioxide. Use of a sodium hydroxide (NaOH) solution as a regeneration solution is undesirable as it causes pH problems in the treated water.

The regeneration solution uses chlorine dioxide water to which chlorine dioxide (ClO ₂ ) is added by collecting a part (about 4%) of the final treated water discharged from the discharge pipe 113 into the solution tank 174. The chlorine dioxide water in the solution tank 174 flows into the injection tube 172 through the solution pump 175 and is injected into the air lift tube 130.

The reverse water wash chamber 140 is installed on the upper portion of the air lift tube 130 and is a chamber in which washed adsorbent, sand and backwash water are collected. A backwash discharge pipe (141) is connected to one side of the reverse osmosis chamber (140) to discharge backwash water washed with the filter adsorbent. The discharged wash water is about 4% of the final treated water since it is part of the final treated water returned to the solution tank 174.

The regeneration unit 150 is installed under the reverse osmosis chamber 140 to regenerate the washed adsorbent and the sand and reduce them to the mixed filtration layer 111. The regeneration unit 150 is a zigzag-type flushing fl ow path that is lifted through the air lift tube 130 and is washed and regenerated in a second order while dropping the filtrate adsorbent (adsorbent and sand) washed and sterilized by the reverse- . It is preferable that a fine bubble generating member (not shown) for generating fine bubbles is installed in the regeneration unit 150 made of a zigzag type cleaning channel. The fine bubble generating member is constituted by an annular ring pipe, and a plurality of nozzle holes are formed on the circumference of the nozzle. The compressed air is supplied to the nozzle hole from a compressor (not shown). The compressed air supplied from the compressor is discharged into the regeneration unit 150 as a small-sized microcapsule through the nozzle hole. The microbubbles thus discharged are separated from the suspended particulate matter adhering to the falling filter- Thereby further improving cleaning power.

The inflow water flows into the central portion of the filtration tank 110 and is dispersed in the form of multiple radials through the distribution and discharge pipe 120. The inflow water is moved in an upward flow while being filtered and adsorbed, The adsorbent is moved to the upper side by supplying air into the air lift tube 130 to regenerate the bottomed contaminated sand and the filtered adsorbent of the adsorbent, And the regenerated sand and the adsorbent are reduced to the upper portion of the mixed filtration layer 111. The contaminants desorbed after regeneration are collected together with the reverse water and collected in the reverse osmosis chamber 140, As shown in FIG.

The deodorizing system of the present invention is characterized in that filtration, adsorption and regeneration (washing and disinfection) are performed simultaneously, and the regeneration solution is supplied from the lower part of the air lift tube by using the mixed filtration layer as a layer in which the adsorbent and the sand are mixed, Therefore, there is no problem such as the coagulation nucleus of the coagulant, and the adsorption rate of the filtration is very fast.

Further, when the primary treatment water of the membrane separation method (MBR) is introduced and detoxified, disinfection is required separately due to the expression of microorganisms and bacteria that are affected by a trace amount of organic substances. However, according to the descaling system of the present invention, Disinfection of the sand and the adsorbent is performed at the same time as the regeneration by the chlorine dioxide and the disinfection of the sand and the adsorbent is performed at the same time and is further reduced to the mixed filtration layer in the filtration tank. Therefore, disinfection of the inside of the filtration tank and disinfection of the final treated water are not necessary, do.

Chlorine dioxide as a regeneration solution can be used simultaneously as a cleaning agent for MBR or as an immersion separator of a secondary treatment facility, and also for eliminating the odor of the facility. The chlorine dioxide maintains the pH range of the final treated water at a concentration of 50 mg / L or less, eliminating the need for additional neutralization, environmentally stable due to no disinfection by-products, protozoan can be removed, and odor removal is excellent.

As described above, the descaling system of the bottom wastewater treatment of the present invention is a problem of the conventional regeneration technology (alkali regeneration method) using chlorine dioxide for regeneration of the mixed layer (mixed filtration layer) without using the coagulant by using the adsorbent in the filtration layer it is unnecessary to adjust the pH, and the sterilization and disinfection of the inside of the filtration tank of the system are performed at the same time.

In the descaling system of the present invention, chlorine dioxide water as a regeneration solution is sprayed to an air lift tube for transferring the filtrate adsorbent which needs regeneration to the upper portion of the filtration tank, and regeneration is performed while the filtrate sorbent is rising upward The use of reverse wastewater is very low and the regeneration efficiency is high.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present invention.

100: Upflow filtration adsorber 110: Filtration tank
111: mixed filtration layer 112: inlet pipe
113: discharge pipe 114: treated water layer
120: Discharge discharge pipe 130: Air lift pipe
140: Reverse osmosis chamber 141: Backwash discharge pipe
150: regeneration section 161: inflow tank
162: Inflow pump 171: Compressor
172: injection tube 173: air lift pump
174: solution tank 175: solution pump

Claims

An uptake system for a sewage treatment system comprising an upflow filtration adsorber for inflow and filtration of influent water,
The upflow filtration adsorber
A filtration tank having a mixed filtration layer filled with a filtration adsorbent mixed with an adsorbent for desorbing and sand to be filtrated;
A distribution discharge pipe for distributing and discharging the inflow water introduced into the filtration tank to the mixed filtration layer,
An air lift tube installed inside the filtration tank and being cleaned by reverse osmosis while the adsorbent and the sand are raised according to the air supply;
A reverse osmosis chamber installed at an upper portion of the air lift tube to collect washed adsorbent, sand and backwash water,
And a regeneration unit installed on the lower side of the reverse osmosis chamber to regenerate the washed adsorbent and the sand to the mixed filtration layer,
Wherein the regeneration solution for regeneration and disinfection is injected into the lower portion of the air lift tube while the filtration adsorbent rises.

The method according to claim 1,
Wherein the adsorbent is a porous ceramic material, and at least one of calcium oxide, ferric oxide, iron sulfate, iron chloride, aluminum sulfate, calcium sulfate, and calcium fluoride is added to the adsorbent.

The method of claim 2,
Wherein the porous ceramic material has a diameter of 0.5 to 1 mm and pores having a diameter of 0.01 탆 to 1 탆 are formed therein.

The method according to claim 1,
Wherein the regeneration solution uses chlorine dioxide water.

The method according to claim 1,
Wherein the regeneration solution is a solution in which chlorine dioxide is mixed with final treated water.

The method according to claim 4 or 5,
Characterized in that sodium carbonate (Na ₂ CO ₃ ) or sodium hydrogencarbonate (NaHCO ₃ ) is added to the regeneration solution and used.

The method according to claim 1,
Wherein the mixing ratio of the adsorbent to the sand is 1: 1 in volume ratio.