KR101534041B1 - Continuous struvite formation apparatus - Google Patents

Continuous struvite formation apparatus Download PDF

Info

Publication number
KR101534041B1
KR101534041B1 KR1020130086432A KR20130086432A KR101534041B1 KR 101534041 B1 KR101534041 B1 KR 101534041B1 KR 1020130086432 A KR1020130086432 A KR 1020130086432A KR 20130086432 A KR20130086432 A KR 20130086432A KR 101534041 B1 KR101534041 B1 KR 101534041B1
Authority
KR
South Korea
Prior art keywords
struvite
wastewater
outer cylinder
hopper
scraper
Prior art date
Application number
KR1020130086432A
Other languages
Korean (ko)
Other versions
KR20150011476A (en
Inventor
김경희
Original Assignee
아쿠아셀 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 아쿠아셀 주식회사 filed Critical 아쿠아셀 주식회사
Priority to KR1020130086432A priority Critical patent/KR101534041B1/en
Publication of KR20150011476A publication Critical patent/KR20150011476A/en
Application granted granted Critical
Publication of KR101534041B1 publication Critical patent/KR101534041B1/en

Links

Images

Landscapes

  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The present invention relates to a continuous struvite generator capable of minimizing the space required and maximizing the production efficiency of struvite grains. According to the present invention, An agitating part having one end connected to the waste water inflow pipe into which the wastewater flows and the other end formed through the lower middle part of the outer bottle; An inner cylinder vertically installed at a center of the outer cylinder and having a diameter smaller than that of the outer cylinder and spaced apart from the other end of the agitation unit by a predetermined distance; A recirculation hopper formed at one side of a lower end of the outer cylinder to recirculate the struvite generated in the stirring portion, the inner cylinder, and the outer cylinder to the wastewater inlet pipe; And a discharge hopper formed on the other side of the lower end of the outer cylinder for discharging the struvite generated in the agitator, the inner cylinder, and the outer cylinder to the outside.

Description

[0001] Continuous struvite formation apparatus [0002]

The present invention relates to a continuous-type Struvite generator. More particularly, the present invention relates to a continuous struvite generator capable of minimizing the space required and maximizing the generation efficiency of struvite particles.

Generally, nitrogen or phosphorus contained in wastewater or sewage is a nutrient that flows into rivers or lakes and causes eutrophication and flows into the sea and causes ocean red tides. These nutrients cause bad odors and deplete dissolved oxygen, which can seriously affect aquatic organisms such as fish.

In particular, industrial wastewater often contains high concentrations of nitrogen and phosphorus as compared to domestic wastewater. In some cases, the pH of the wastewater is higher than that of domestic wastewater and may contain toxic substances in some cases. Therefore, It is impossible to treat industrial wastewater separately.

Furthermore, when magnesium coexists in wastewater having a high content of nitrogen and phosphorus, a crystalline material called struvite is generated and acts as a scale-inducing substance in pumps, valves, piping fittings and the like. The naturally generated struvite reduces the cross-sectional area of the piping, thereby causing frequent problems such as lowered flow rate and power loss, and waste of manpower and time for removing struvite.

Therefore, before wastewater containing excess nitrogen and phosphorus reacts with magnesium to produce struvite, wastewater containing nitrogen and phosphorus is reacted with magnesium artificially in advance to form struvite, so that nitrogen and phosphorus present in the wastewater It is necessary to reduce the amount of struvite that is generated naturally and to maximize the efficiency of wastewater treatment in the wastewater treatment facility.

As one of them, there exists a cone type reactor in which struvite is artificially generated, the transverse sectional area of which increases stepwise toward the upper part, and the cylindrical reactor in which the lower part is a conical shape.

The cone type reactor is disclosed in Patent Registration No. 10-1098890. In this cone type reactor, raw water (wastewater containing nitrogen and phosphorus) flows into the lower part and is mixed with chemicals using a nozzle or a high flow rate at the time of introduction, And enters the interior. At this time, in the reactor, the generated struvite particles float due to the flow velocity, and expand as they go to the upper part. As the flow rate of the fluid is lowered, the floating particles are again precipitated in the form of settling again and finally the struvite particles . Thus, the cone-type reactor is designed to prevent the particle from being leaked by making the flow rate of the upper portion almost no more than that of the lower portion. The tubular shape of the vertically connected tubular shape is twice as high as that of the general reactor, There is a disadvantage in increasing the number

The cylindrical reactor is advantageous in that it requires relatively small area and height of the reactor as compared with the cone type reactor and thus has a limited spatial limitation. However, the power required for stirring and circulation is required and the efficiency of the reactor is low due to high particle- .

Korean Patent Registration No. 10-10988890

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a continuous struchet generation device capable of minimizing a space required and maximizing generation efficiency of struvite grains.

According to the present invention, An agitating part having one end connected to the waste water inflow pipe into which the wastewater flows and the other end formed through the lower middle part of the outer bottle; An inner cylinder vertically installed at a center of the outer cylinder and having a diameter smaller than that of the outer cylinder and spaced apart from the other end of the agitation unit by a predetermined distance; A recirculation hopper formed at one side of a lower end of the outer cylinder to recirculate the struvite generated in the stirring portion, the inner cylinder, and the outer cylinder to the wastewater inlet pipe; And a discharge hopper formed on the other side of the lower end of the outer cylinder for discharging the struvite generated in the agitator, the inner cylinder, and the outer cylinder to the outside.

The scraper may further include a scraper that collects the struvite that has passed through the agitating portion and the inner cylinder and sinks to the bottom of the outer cylinder by the recycle hopper and the discharge hopper.

The motor may further include a motor part connected to the scraper and including a rotating shaft passing through the inside of the inner tube and a motor for rotating the rotating shaft, To the recycle hopper and the discharge hopper.

The recycling hopper introduces the struvite gathered by the scraper into the wastewater inlet pipe by operation of the valve and recirculates the struvite collected by the scraper to the agitator together with the wastewater. And is discharged to the outside by operation.

In addition, wastewater and magnesium-containing chemicals are introduced into the agitating portion from the wastewater inlet pipe, and struvite is generated primarily by the reaction of the wastewater and the chemicals. Inside the inner wastewater, And a struvite is generated in a secondary by the reaction of the drug.

The present invention has the effect of minimizing the required site and space, and maximizing the generation efficiency of the struvite grains, by providing a separate structure inside the continuous struvite generator.

In addition, the present invention can remove nitrogen and phosphorus from high-concentration nitrogen and phosphorus-containing malignant wastewater to increase the treatment efficiency of the subsequent wastewater treatment facility, and can also satisfy the enhanced environmental regulation requirements of nutrients have.

In addition, the present invention has the effect of reusing the continuously produced struvite as fertilizer or the like and recycling the resources environmentally friendly.

1 is a schematic cross-sectional view showing a continuous struvite generation apparatus according to an embodiment of the present invention.
Fig. 2 is a perspective view showing the struc- tural struc- ture generating apparatus of Fig. 1 more stereoscopically.
FIG. 3 is a graph showing the TP removal rate according to the pH change with respect to the discharged water when the inflow water is finally discharged overflow in the continuous type Struvite generation apparatus according to the present invention, compared with the conventional reactor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a schematic cross-sectional view showing a continuous-type struvite-producing apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view showing a more detailed three-dimensional representation of the continuous- FIG. 5 is a graph showing the TP removal rate according to the pH change with respect to the discharged water when the raw water is finally discharged overflow in the continuous-type Struvite generator according to the present invention, compared with the conventional reactor.

1 and 2, a struvite generator 10 according to the present invention includes an outer cylinder 100, a stirring unit 200, an inner cylinder 300, a recycle hopper 400, a discharge hopper 500, A scraper 600, and a motor unit 700.

The outer cylinder 100 has a cylindrical shape as a whole, and the lower end of the outer cylinder 100 is composed of two hoppers 400 and 500. Therefore, the struvite grains grown through the agitator 200 and the inner cylinder 300 sink to the bottom, and the growth of the struvite grains is not completely performed, The outer cylinder 100 can be designed with a structure in which the area is made larger than the transverse area of the inner cylinder 300 and the flow velocity is lowered so as not to be lost to the outside. In the outer cylinder 100, the overflow weir 110 is installed at a lower position than the upper end of the inner cylinder 300, so that the waste water except for the struvite generated by repeated sedimentation and flooding in the inner cylinder 300 flows out So that it is possible to facilitate the outflow to the pipe 120. At this time, the effluent discharged to the effluent outlet pipe 120 may be discharged immediately or may be transferred to another pretreatment facility.

One end of the agitator 200 is connected to a wastewater inlet pipe 210 into which wastewater flows and the other end is formed to pass through a lower middle portion of the outer casing 100. Therefore, chemicals such as wastewater and magnesium are introduced into the stirring part 200 from the wastewater inlet pipe 210, and struvite is generated primarily by the reaction of the wastewater and the chemicals. Here, Struvite may be formed by the following reaction.

Mg 2+ + NH 4 + + PO 4 3- + 6H 2 O ↔ MgNH 4 PO 4 .6H 2 O

As can be seen from the above reaction formula, struvite is produced by reacting nitrogen (N), phosphorus (P) and magnesium (Mg) at a ratio of 1: 1: 1 under alkaline conditions. In the present invention, magnesium medicine can be added to wastewater containing excess nitrogen and phosphorus to produce struvite. At this time, an alkaline source such as NaOH may be appropriately added to maintain the alkaline condition, and in some cases, when nitrogen or phosphorus in the wastewater is insufficient, it may be possible to artificially introduce nitrogen or phosphorus.

Although not shown in the drawings of the present invention, a chemical storage tank for supplying phosphorus (P), a MgCl 2 storage tank for supplying magnesium dust (Mg), a storage tank for storing NaOH for alkali supply Tank, and a raw water supply tank for supplying raw water (wastewater) may also be separately provided. Therefore, the wastewater (raw water) supplied from the raw water supply tank and the medicines supplied from the medicine storage tank flow into the wastewater inflow pipe 210, and the wastewater and medicines supplied through the wastewater inflow pipe 210 are discharged from the agitation unit 200 It reacts appropriately and struvite is produced primarily.

The inner cylinder 300 is installed perpendicular to the center of the outer cylinder 100 and has a diameter smaller than that of the outer cylinder 100 and is spaced apart from the other end of the agitation unit 200 by a predetermined distance. The upper end of the inner tube 300 is formed higher than the overflow weir 110, so that the struvite particles can not be prevented from escaping to the outside of the inner cylinder 300.

The inner tube 300 is installed with a diameter smaller than that of the outer tube 100 perpendicularly to the center of the outer tube 100 so that the wastewater and chemicals having passed through the stirring portion 200 pass through the inner tube 300, And stubby particles are gradually grown as the floats are continuously formed.

The inner tube 300 is spaced apart from the upper end of the agitator 200 by a predetermined distance and is formed of a struvite produced in the agitator 200 and a struvite produced by repeating lifting and settling in the inner cylinder 300, To the recycle hopper 400 and the discharge hopper 500, which are the lower end portions of the outer cylinder 100, respectively.

Therefore, struvite is generated in the inner tube 300 by the reaction of the wastewater and the chemical that rise through the agitator 200. That is, the struvite particles generated in the inner cylinder 300 float upward due to the fluid flow velocity, and then are repeatedly dropped by gravity to crystallize the struvite grains secondarily.

By producing the struvite thus produced, there is an advantage that the phosphorus and nitrogen can be removed from the wastewater, and at the same time, the struvite can be reused as a persistent fertilizer.

The recycle hopper 400 is formed at one side of the lower end of the outer cylinder 100 and includes a stirrer 200, a inner cylinder 300, and a struvite 800 generated inside the outer cylinder 100, ). Therefore, the recirculation hopper 400 flows into the waste water inflow pipe 210 by the operation of the valve 410, which is collected by the scraper 600, (200). ≪ / RTI >

The discharge hopper 500 is formed on the other side of the lower end of the outer cylinder 100 and discharges the struvite 800 generated inside the agitation part 200, the inner cylinder 300 and the outer cylinder 100 to the outside . Therefore, the discharge hopper 500 discharges the collected struvite to the outside by the operation of the valve 510 by the scraper 600 which will be described later.

Two circulation hoppers 400 and two discharge hoppers 500 are installed at the lower end of the outer cylinder 100 and valves 410 and 510 are installed in the respective hoppers 400 and 500.

At this time, the recycle hopper 400 maintains the valve 410 at the normally open state, and the struvite particles are recycled to the wastewater inlet pipe 210 and are moved to the agitation part 200 together with the newly supplied wastewater (including chemicals) will be.

In addition, the discharge hopper 500 is normally closed in the state of the valve 510, and is opened according to the set time by the operation of the timer, and the crystallized struvite particles are discharged to the outside. The struvite discharged to the outside is completed in a form that can be reused as fertilizer through the drying process.

The scraper 600 serves to collect the struvite that has fallen from the agitator 200 and the inner cylinder 300 and collected in the lower portion of the outer cylinder 100 into the recycle hopper 400 and the discharge hopper 500. Therefore, the struvite that has settled in the lower portion of the outer cylinder 100 is collected into the recycle hopper 400 and the discharge hopper 500 by the rotation of the scraper 600.

The motor unit 700 includes a rotating shaft 710 connected to the scraper 600 and passing through the inside of the inner cylinder 300 and a motor 720 for rotating the rotating shaft 710. The rotating shaft 710 is rotated by the motor 720 and the scraper 600 connected to the rotating shaft 710 is also rotated so that the struvite is collected by the recycle hopper 400 and the discharging hopper 500 . Particularly, the rotating shaft 710 serves to rotate the scraper 600 and smoothly mix wastewater and chemicals in the agitator 200, the inner cylinder 300, and the outer cylinder 100.

In summary, when the wastewater (raw water), medicines, or an alkaline agent (pH control) is introduced into the agitation unit 200 through the wastewater inlet pipe 210, the strobite nuclei are generated. And it grows gradually. The stirring part 200 and the inner cylinder 300 are parts where sedimentation and floatation of the particles are continuously performed and a part of the generated struvite particles escape by the fluid flow between the stirring part 200 and the inner cylinder 300, And some of them continue to grow at the lower end of the outer cylinder 100. At this time, the struvite particles exiting between the agitating part 200 and the inner cylinder 300 have a certain sedimentation property while grain growth occurs between the agitating part 200 and the inner cylinder 300, The accumulated particles are collected by the recycling hopper 400 using the scrapers 600 and the collected particles are circulated through the wastewater inlet pipe 210 to the stirring part 200 and the inner pipe 300. As the process continues, the grown struvite particles are discharged to the outside through the discharge hopper 500 according to the growth rate of the particles.

Meanwhile, the process and results of testing the T-P removal rate according to the pH change using the continuous struvite production apparatus 100 according to the present invention will be described in the following Example 1.

First, the raw water (wastewater) was subjected to a dehydration filtrate obtained by dewatering the digester discharge liquid. To evaluate the performance using the raw water, a conventional cylindrical (conical) reactor and a cone type reactor and a patent reactor A struvite generator) was fabricated and tested.

The TP concentration of raw water was slightly different according to the date of experiment, and 1.2 times MgCl 2 was injected as mol ratio according to TP concentration of raw water. Since the TN concentration in the raw water is sufficiently high compared to other components, the molar ratio is excluded. The residence time in the reactor was adjusted to 30 minutes by the raw water flow rate and tested after 2 hours so that the inside of the reactor could be stabilized.

[Table 1] and FIG. 3 show the performance evaluation results according to the reactors.

Conventional conical reactor Conventional cone type reactor Patent Reactor division Residual concentration
(mg / L) Removal rate
[%] Residual concentration
(mg / L) Removal rate
[%] Residual concentration
(mg / L) Removal rate
[%] enemy 101.7 - 75.5 - 94.9 - pH 8 42 58.7 26.5 64.9 31.2 67.1 pH 9 38 62.6 14.55 80.7 13.52 85.8 pH 10 37.2 63.4 14.35 81.0 14.01 85.2

In particular, the performance evaluation of the reactor was based on the analysis of the effluent passing through the reactor, and the T-P removal rate of effluent water as the influent source was used as an index of performance evaluation.

As a result of the performance evaluation, it was confirmed that the patent reactor (continuous struvite generator) according to the present invention exhibited a TP removal effect of about 22% at a pH of 9 compared with the conventional cone reactor and about 5% of the conventional cone reactor .

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the embodiments disclosed in the present specification are intended to illustrate rather than limit the present invention, and the scope and spirit of the present invention are not limited by these embodiments. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of the present invention should be construed as being included in the scope of the present invention.

10: Continuous StruByte Generator
100: outer tube
110: Overwear
120: Wastewater discharge pipe
200: stirring part
210: waste water inlet pipe
300: inner tube
400: recirculation hopper
410: Valve
500: discharge hopper
510: Valve
600: scraper
700: motor section
710:
720: Motor
800: Struvite

Claims (5)

Outer tube;
An agitating part having one end connected to the waste water inflow pipe into which the wastewater flows and the other end formed through the lower middle part of the outer bottle;
An inner cylinder vertically installed at a center of the outer cylinder and having a diameter smaller than that of the outer cylinder and spaced apart from the other end of the agitation unit by a predetermined distance;
A recirculation hopper formed at one side of a lower end of the outer cylinder to recirculate the struvite generated in the stirring portion, the inner cylinder, and the outer cylinder to the wastewater inlet pipe;
A discharge hopper formed on the other side of the lower end of the outer cylinder for discharging the struvite generated in the agitator, the inner cylinder, and the outer cylinder to the outside; And
Further comprising a scraper which collects the struvite which has passed through the agitating portion and the inner cylinder and sinks to the lower portion of the outer cylinder by the recycle hopper and the discharge hopper.
delete The method according to claim 1,
And a motor part connected to the scraper and including a rotating shaft passing through the inside of the inner tube and a motor for rotating the rotating shaft, wherein the struvite sinking in the lower part of the outer tube is recirculated by rotation of the scraper Hopper and the discharge hopper. ≪ Desc / Clms Page number 13 >
The method of claim 3,
The recycle hopper introduces the struvite gathered by the scraper into the wastewater inlet pipe by operation of the valve and recirculates the struvite together with the wastewater to the stirring section. The exhaust hopper collects the struvite collected by the scraper into the operation of the valve And the gas is discharged to the outside.
The method according to claim 1,
The agitation unit is provided with wastewater and magnesium-containing medicines from the wastewater inlet pipe to generate struvite primarily by the reaction of the wastewater and the medicament. Inside the inner wastewater, wastewater and chemicals Wherein the struvite is generated in the second stage by the reaction of the struvite.
KR1020130086432A 2013-07-23 2013-07-23 Continuous struvite formation apparatus KR101534041B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130086432A KR101534041B1 (en) 2013-07-23 2013-07-23 Continuous struvite formation apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130086432A KR101534041B1 (en) 2013-07-23 2013-07-23 Continuous struvite formation apparatus

Publications (2)

Publication Number Publication Date
KR20150011476A KR20150011476A (en) 2015-02-02
KR101534041B1 true KR101534041B1 (en) 2015-07-06

Family

ID=52487856

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130086432A KR101534041B1 (en) 2013-07-23 2013-07-23 Continuous struvite formation apparatus

Country Status (1)

Country Link
KR (1) KR101534041B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110563198B (en) * 2019-09-04 2022-04-01 广西长润环境工程有限公司 Chemical fertilizer wastewater treatment method and treatment equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11309464A (en) * 1998-04-28 1999-11-09 Mitsubishi Heavy Ind Ltd Crystallization dephosphorization method and its device
KR20020005521A (en) * 2001-09-13 2002-01-17 서정원 Process and system for wastewater treatment using struvite(MAP)
KR20030034299A (en) * 2001-10-22 2003-05-09 대한민국(충북대학교총장) Continuous, struvite crystallization apparatus
KR101019200B1 (en) * 2008-02-11 2011-03-03 (주)엔텍스 Nitrogen-rich waste water treatment method and method for producing struvite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11309464A (en) * 1998-04-28 1999-11-09 Mitsubishi Heavy Ind Ltd Crystallization dephosphorization method and its device
KR20020005521A (en) * 2001-09-13 2002-01-17 서정원 Process and system for wastewater treatment using struvite(MAP)
KR20030034299A (en) * 2001-10-22 2003-05-09 대한민국(충북대학교총장) Continuous, struvite crystallization apparatus
KR101019200B1 (en) * 2008-02-11 2011-03-03 (주)엔텍스 Nitrogen-rich waste water treatment method and method for producing struvite

Also Published As

Publication number Publication date
KR20150011476A (en) 2015-02-02

Similar Documents

Publication Publication Date Title
CN106904795A (en) A kind of milk cattle cultivating waste water treatment process
CN104445836B (en) High concentration pitch method of wastewater treatment and device
CN104743742B (en) A kind of chemi-mechanical pulp Waste Water Treatment
US20220119289A1 (en) Process for recovering phosphorus
CN205635294U (en) A processing system for handling high concentration polyurethane synthetic leather waste water
CN104114499A (en) Crystallization reaction apparatus for recovering resources
KR101417277B1 (en) Device to cohere and to dispose of wastes water
KR100844503B1 (en) Method and apparatus for treating wastewater
JP4409532B2 (en) Apparatus for treating wastewater containing high-concentration nitrogen such as livestock wastewater and manure, and its treatment method
KR101534041B1 (en) Continuous struvite formation apparatus
CN109761457A (en) A kind of countryside sewage treatment equipment and method
CN107540148B (en) Wastewater treatment system and wastewater treatment method for preparing ethanol from cellulose
CN109052867A (en) A kind of dispersed wastewater EGA processing unit and treatment process based on modified active carrier
KR101278475B1 (en) Sludge Treatment Facility Combining Swirl Flow Type Inorganic Sludge Selective Discharge Device and Bioreactor
KR101195006B1 (en) Conversion of strong organic wastewater to methane through anaerobic digestion plant and process
CN112279380A (en) Drum formula self-loopa denitrogenation integration sewage treatment device based on good oxygen granule mud
CN104609522B (en) A kind of batch-type dense media flocculation sediment water treatment facilities
JP2006326386A (en) Organic sludge water treatment method
CN206843279U (en) Pasture Waste Water Treatment
KR101352339B1 (en) The Advanced Treatment Apparatus Equipped Submersible Pump For Removal Of Nitrogen And Phosphorus In Sewage
KR102153994B1 (en) Volume change type water treatment device for circulation type upper focusing aeration
JP2004261661A (en) Method for purifying lake or the like, and purifying system therefor
KR20140022173A (en) Sewage treatment device
KR20220078024A (en) Apparatus and Method for Treating Anaerobic Digestive Fluid
TW201623155A (en) Wastewater treatment method and wastewater treatment device

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
FPAY Annual fee payment

Payment date: 20180611

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20190603

Year of fee payment: 5