DK178361B1 - An apparatus for removing supsended solids from liquids - Google Patents
An apparatus for removing supsended solids from liquids Download PDFInfo
- Publication number
- DK178361B1 DK178361B1 DK201370464A DKPA201370464A DK178361B1 DK 178361 B1 DK178361 B1 DK 178361B1 DK 201370464 A DK201370464 A DK 201370464A DK PA201370464 A DKPA201370464 A DK PA201370464A DK 178361 B1 DK178361 B1 DK 178361B1
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- sediment
- liquid
- volume
- particles
- sediment collection
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- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Treatment Of Sludge (AREA)
Abstract
A liquid cleaning apparatus comprising: a tank having a liquid input and a liquid output, where the apparatus further comprises a sediment collecting element comprising, a sediment collecting area located within the volume of the tank adapted to allow particles in the liquid having a greater density that than the liquid to settle by gravity into a submerged sediment, a closed sediment collecting volume having a first end in liquid communication with the sediment collecting area, sediment transport means adapted to transport any submerged settled sediment particles from the sediment collecting area and into the sediment collecting volume, wherein the sediment collecting volume is adapted so that liquid inside the volume is substituted by transported sediment particles and the substituted liquid is forced in a direction towards the first end in order to reduce the liquid content of the settled sediment particles inside the collecting volume.
Description
[TITLE] AN APPARATUS FOR REMOVING SUPSENDED SOLIDS FROM LIQUIDS[FIELD OF THE INVENTION] [BACKGROUND]
In industrial applications where polluted gas, such as flue gas, is being produced, theflue gas is often introduced into a hazardous substance removing apparatus in orderfor the gaseous formed solids within the flue gas to be collected in a liquid inside thehazardous substance removing apparatus. The gaseous flue gas is introduced into acompartment where liquids, such as water, is sprayed into the same compartment,causing a drop in temperature of the gas and removing hazardous particles from thegaseous flue gas.
Thus, the flue gas is introduced into a hazardous substance removing apparatus wherehazardous particles are removed and the flue gas exits the apparatus where the haz¬ardous substance content of the flue gas is reduced significantly. Such apparatus isshown in e.g. US 2008/0174032.
A liquid, such as water, is introduced into the hazardous substance removing appa¬ratus, and when the liquid has served its purpose inside the apparatus, the cleaningliquid has an increased concentration of the particles that were removed from the fluegas. Some of the particles are safe for the environment and can be disposed of directlyinto the environment, while some of the particles may be dangerous for the environ¬ment and must be removed from the liquid before the liquid is disposed into the envi¬ronment.
One method of removing such particles may be to introduce the liquid into a decantercentrifuge, where slurry or contaminated liquid is introduced into the centrifuge. Theliquid is centrifuged in a cylinder, where the solid material collects at the side walls ofthe centrifuge, and is maneuvered out of the centrifuge as dehydrated solids, while theclarified liquid is drained from the centrifuge. Such an apparatus is both expensive andcomplex, as the centrifuge has to be spun using a motor, and the solids must be ma¬neuvered out of the centrifuge mechanically. This causes the system to be highly vul¬ nerable to mechanical breakdowns, which could lead to a complete stop to the indus¬trial application, as the liquid cannot be cleaned and disposed of.
US 1,716,228 discloses a continuous settling device for continuously settling precipi¬tates and other sedimentary matters from liquids or solutions, comprising a rectangularsection at an upper part and a converging or tapering section at the lower part. Thelower part comprises a guiding chamber having a conveyor in the form of a screw,where the conveyor is adapted to gradually move the precipitate or sediment towards adischarge pipe.
US7771594 relates to methods and apparatus for removing suspended solids fromaqueous fluids, and from water-based drilling fluids in particular, where the apparatuscomprises a settling tank having a sloping floor extending from an upper end to a lowerend; a collection chamber adjacent to, and having a floor lower than, said lower end ofthe settling tank's sloping floor, said collection chamber having an outlet port. The ap¬paratus however is quite complex, the substances are difficult to remove from the tankwhen the substances are settled inside the tank.
Thus, there is a need for a reliable and simple apparatus for removing solid particlesfrom liquids in industrial applications.
[GENERAL DESCRIPTION]
In accordance with the invention, there is provided a liquid cleaning apparatus compris¬ing: a tank having a liquid input and a liquid output, where the apparatus further com¬prises; a sediment collecting element comprising, a sediment collecting area locatedwithin the volume of the tank adapted to allow particles in the liquid having a greaterdensity that than the liquid to settle by gravity into a submerged sediment, a closedsediment collecting volume having a first end in liquid communication with the sedimentcollecting area, sediment transport means adapted to transport any submerged settledsediment particles from the sediment collecting area and into the sediment collectingvolume, the sediment transport means comprising a screw conveyor, wherein the sed¬iment collecting volume is adapted so that liquid inside the volume is substituted bytransported sediment particles and the substituted liquid is forced in a direction towardsthe first end in order to reduce the liquid content of the settled sediment particles inside the collecting volume, wherein increased resistance to the screw conveyor is used toinitiate the emptying of the sediment collecting volume.
When the tank is filled with liquid to be cleaned, the liquid immerses the sediment col¬lecting area, and the liquid enters the sediment collecting volume, so that the closedvolume fills until the volume fills with liquid. The solid particles in the liquid settle intothe sediment collecting area, and are subsequently transported from the sediment col¬lecting area and into the sediment collecting volume. As there is unhindered liquidcommunication between the sediment collecting area and the sediment collecting vol¬ume, and the solid particles have a greater density than the liquid, the particles substi¬tute liquid inside the volume, so that the entry of a particle forces substantially thesame volume of liquid from the volume. The forcing of the liquid from the volume en¬sures that when particles enter the volume, the liquid content of the materials inside thevolume decreases, as the volume of sediment particles increases while the volume ofliquid decreases, ensuring that the liquid content is reduced with added sediment parti¬cles.
By continuing the process of transporting the collected sediment particles into the sed¬iment collecting volume it is possible to reduce the liquid content inside the sedimentcollecting volume gradually until a predefined level of liquid content inside the volume isreached. Thus, the removal of the sediment inside the sediment collecting volume en¬sures that the collected sediment, which are impurities of the liquid, may be disposed ofwithout wasting too much of the cleaned liquid, and the cleaned liquid may be intro¬duced into the environment.
The liquid content of the sediment inside the sediment collecting area is approximately97% by volume, while it is possible to reduce the liquid content inside the collectingvolume to approximately 30-40%, which ensures that the disposed sediment has ahigher sediment particle concentration and has a smaller volume than if it would bedisposed of directly from the sediment collecting area.
In one embodiment the tank may comprise a first and/or a second peripheral edge thatextends towards the sediment collecting area, having a plane that is substantially paral¬lel to the central axis of the tank. The tank is preferably provided with side edges thatextend at an angle towards the sediment collecting area, so that when the particles thatpollute the liquid sinks in the volume of liquid, the particles are directed towards the sediment collecting area. This means, as an example, that the sediment collecting areamay be a relatively small area at the bottom of the tank, and the peripheral edges en¬sure that the particles are directed towards the collecting area and ensures that theparticles will not spread in direction away from the collecting area.
The sediment collecting area, may be positioned at the lowest part of the tank, wherethe collecting area extends from a first end of the tank and towards the second end ofthe tank, where the longitudinal axis of the sediment collecting area is substantiallyparallel to the flow direction of the tank from the liquid input to the liquid output.
In one embodiment the sediment collecting element may be provided with a first valvebetween the sediment collecting volume and the sediment collecting area, to close offliquid communication between the sediment collecting volume and area. Thus, whenthe sediment collecting volume has reached a predefined volume of sediment particles,and is ready to be emptied, the first valve may be closed, so that the liquid communica¬tion between the sediment collecting area and the volume is closed, ensuring that theliquid inside the tank does not flow past the first valve. Thus, the concentrated sedi¬ment inside the sediment collecting volume may be removed and the volume emptied.Upon emptying the sediment collecting volume and ensuring that the volume is closed,the valve may be opened again, and again allowing liquid communication between thesediment collecting area and the liquid collecting volume, and allowing the sedimentcollected in the sediment collected area to be subsequently transported into the sedi¬ment collecting volume.
In one embodiment the sediment collecting volume may be provided with an openingmechanism for providing external access to the collecting volume allowing the collectedsediment to be discharged from the sediment collecting volume. The opening mecha¬nism may be a mechanism that can be toggled between having an open access to thecollecting volume, and having the access closed to the collecting volume. When thecollecting volume has to be emptied, the opening mechanism can be opened, providingan opening into the volume, and the collected sediment can be removed or dischargedfrom the collecting volume. When the collected sediment has been removed, the sedi¬ment collecting volume can be sealed off using the opening mechanism, so that thecollecting volume is again sealed from the outside, and is capable of re-establishing itsfunction of collecting sediment.
In one embodiment the sediment collecting element may be provided with a com¬pressed air input, positioned between the first valve and the sediment collecting volumefor vacating the collected sediment. Thus, the compressed air input may be utilized toblow compressed air into the collecting volume, so that the compressed air pushes thecollected sediment out of the collecting volume, and out of the open external access tothe collecting volume, and thereby emptying the sediment collecting volume.
In one embodiment the sediment collecting area comprises one or more openings intoa sediment collecting compartment. The sediment collecting area may be arranged atthe bottom of the tank, where the settled sediment may enter into a sediment collectingcompartment that is separated from the tank, creating a separated volume that ensuresthat any liquid flow inside the tank disturbs the settled sediment as little as possible.The sediment collecting compartment may be provided with one or more openings thatallow access from the tank and/or the sediment collecting area and into the sedimentcollecting compartment.
In one embodiment the sediment collecting compartment may be an elongated cylindri¬cal unit. The elongated cylindrical unit may be positioned at the lowest point of the tank,and extending along the entire length of the bottom of the tank, ensuring that all longi¬tudinal cross sections of the tank are provided with a sediment collecting compartment.
In one embodiment the sediment transport means may be a screw conveyor for trans¬porting the settled sediment. The screw conveyor may be rotated along its longitudinalaccess, so that the rotating movement of the screw conveyor moves the settled sedi¬ment particles in a direction towards the sediment collecting volume. The screw con¬veyor may be provided at the bottom of the tank, or may alternatively be provided in¬side the cylindrical sediment collecting compartment, and thereby be separated fromthe tank. The cylindrical sediment collecting compartment may have a diameter that issubstantially equal to or slightly larger than a diameter of the screw conveyor, ensuringthat the sediment is moved in a single direction and providing radial boundaries for thescrew conveyor.
In one embodiment the sediment collecting area may be positioned substantially equi¬distant from the first peripheral edge and the second peripheral edge. Thus the sedi¬ment collecting area may be positioned substantially at the centre of the tank, andthereby ensuring that the particles in the liquid that are settling have the shortest possi- ble distance to travel, in a direction transverse to the direction of liquid flow to reach thesediment collecting area, as the particles sink in a substantially vertical direction in theliquid. Thus, a particle that is in the liquid close to the peripheral edge of the tank, willonly have to be maneuvered or directed a length that is at maximum the half width ofthe tank.
In one embodiment the plane of the base wall may extends at an angle that is between10-30 degrees from horizontal, more specifically between 12-20 degrees from hori¬zontal, even more specifically between 13-17 degrees from horizontal, more specifi¬cally at substantially 15 degrees from horizontal. The angle of the base wall, i.e. thewall extending between the sediment collecting area and the peripheral edge of thetank, may be angled so that when the particles come into contact with the base wall,the particle has a tendency to move in a direction towards the sediment collecting areadue to the combination of the angle of the wall and gravity. The particles, may settle onthe base wall in a layer, that when the mass of the layer reaches a certain amount, themass and the gravity overcomes the static friction of the base wall and the mass slidestowards the sediment collecting area.
In one embodiment the base wall may be provided with a mechanical agitating elementto provide mechanical disturbance to the base wall to assist settled sediment on thebase wall to move towards the sediment collecting area. In situations where the basewall may be provided with a layer of settled particles, that have to be moved towardsthe sediment collecting area, the base wall may be provided with mechanical agitatingelement or means to mechanically disturb the settled particles so that the particles slidetowards the collecting area. The mechanical agitations element may be in the form ofvibration means that may be used to move the settled particles and to reduce the fric¬tion coefficient of the wall from static friction to kinetic friction, which is usually lower
In one embodiment the height of the tank may be less than 700 mm, more specifically600 mm, more specifically 500 mm.
[BRIEF DESCRIPTION OF DRAWINGS]
The invention is explained in detail below with reference to the drawing, in which
Fig. 1 is a schematic diagram of a liquid cleaning apparatus in accordance with the in¬vention.
[DETAILED DESCRIPTION OF DRAWINGS]
Fig. 1 shows a liquid cleaning apparatus 1 comprising a tank 2, where the tank com¬prises a first end 3, having a liquid input 4 and a second end 5 having a liquid output,and a bottom 7. The tank 2 is adapted to receive a liquid 8 that is to be cleaned, wherethe cleaning apparatus 1 is adapted to remove particles in the liquid 8 that have agreater density than the liquid. The cleaning of the liquid 8 occurs while the liquid 8 isflowing in a direction from the first end 3 to the second end 5 in the direction shown byarrow A. When the liquid enters the tank 2, the liquid comprises contaminant particlesthat must be removed from the liquid before the liquid is to be disposed of into the envi¬ronment, as the amount of contaminants may be is greater than what is allowed, for theliquid to be released back into the environment. The liquid is preferably water, whichhas been utilized to clean flue gas, and the cleaning has resulted in that the watercomprises a significant amount of calcium sulphates, in suspended particle form, thatmust be cleaned before the water is introduced back into the environment.
The suspended contaminant particles in the water, that have a higher density (massper unit volume) than the water, have a natural tendency to sink in the water in the di¬rection of gravity B. Thus, as the tank has a liquid input 4 that is placed lower than theliquid output 6, ensures that the particles suspended in the water are not allowed es¬cape the tank via liquid output 6. The flow of the liquid may be adjusted to ensure thatthe flow rate of liquid is so limited that the flow does not raise the particles in the water,especially at the second end 5, for the particles to escape via the liquid output.
The flow rate of the liquid 8 inside the tank 2 may be adjusted so that the when the par¬ticle has travelled in a longitudinal direction A from the first end to the second end, theparticle will have reached the bottom 7 of the tank in order for the particles to settle onthe bottom 7 of the tank 2 in a sediment collecting area. Thus, while the particle sus¬pended in the liquid travels X units in direction A of the flow, it travels Y units in the di¬rection B towards the bottom, ensuring that the particles suspended in the liquid 8 arenot in the vicinity of the liquid output of the tank, when the liquid exits the tank. Thus, byintroducing the liquid inside the tank, and allowing the liquid to flow through the tank,the suspended particles will settle on the bottom 7 and the liquid exiting the tank will have a much lower concentration of contaminant particles than the liquid that enteredthe tank.
When the particles settle on the bottom 7 of the tank 2, in the sediment collecting area 10, it is important that the sediment is removed from the tank 2, without stirring to muchin the sediment in order to ensure that the sediment does not re-contaminate the liquid.Furthermore, the liquid content of the sediment, when gathered at the bottom of thetank may be around 90-97%, which means that if the sediment is removed directly fromthe liquid in the tank, there would be a significant loss of liquid that could not be rein¬troduced clean into the environment, and the sediment would have to be cleaned fur¬ther in order to be ready for being disposed of.
Thus, a transport element 9 may be provided in the sediment collecting area, whichtransports the collected sediment in a direction C towards a sediment collecting volume 11, that is in liquid communication with the sediment collecting area 10 and the tank 2.The sediment collecting volume is provided with two closing mechanisms, a first clos¬ing mechanism 12 and a second closing mechanism 13, where both mechanisms arecapable of individually closing off and opening up the first end and the second end ofthe collecting volume 11, respectively.
During the operation of the apparatus, the first closing mechanism 12 is open, allowingthe volume 11 to be in direct liquid contact with the tank 2, and the second closingmechanism 13 is closed ensuring that the liquid does not exit the volume 11 during op¬eration. The volume may be arranged a lower area than the sediment collecting area,so that gravity forces the liquid inside the volume, and fills up the volume when liquid isinside the tank 2. The transport element may be in the form of a screw conveyor, that isdriven by a motor 17, preferably an electrical motor, that moves the sediment in the di¬rection C towards the first end 4 and into the collecting volume.
As both the transport means 9 and the liquid collecting volume are immersed in the liq¬uid 8, the transport means effectively only moves the sediment in the direction, whilenot increasing the liquid pressure inside the collecting volume 11, as the liquid is in freeflow back into the tank 2. Thus, when the transport means moves sediment from thebottom 7 and into the volume in the direction shown by arrow D, the sediment sinks in¬to the volume and as the sediment has a higher density than water, the volume of sed¬iment introduced into the volume forces approximately the same volume of water out of the volume and in a direction towards the tank. Thus, the substitution of the sedimentparticles, ensures that the liquid content of collected sediment inside the volume is re¬duced when the amount of sediment inside the volume 11 is increased. Thus the col¬lecting of the sediment in the collecting volume ensures that the sludge inside the vol¬ume has a higher concentration of sediment particles compared to the concentration ofthe sediment inside the tank.
When the sediment collecting volume has reached a level of sediment that requires theemptying of the collecting volume 11, the first closing mechanism 12 may be closed,ensuring that the liquid communication between the tank 2 and volume 11 is sealed,and the second closing mechanism 13 may be opened. The second closing mecha¬nism opens the collecting volume into a disposal area 18, where the sludge inside thevolume may be disposed of. In order to assist the emptying of the collecting volume 11,the collecting volume may be provided with a compressed air input 19, that allowscompressed air to be introduced into the collecting volume 11 in the opposing end 14of volume 11, allowing the air to push the collected sludge out of the volume 11. Thecollected sludge may be relatively dense, as the liquid has been removed from the sed¬iment, so that the sludge does not release on its own from the collecting volume, andthe air may be used to shorten the release time of the sludge from the volume 11.
When the volume 11 has been emptied, the second closing mechanism 13 may beclosed, sealing off the communication between the volume 11 and the disposal area18, and the first mechanism may be opened, allowing liquid from the tank 2 to flowfreely into the collecting volume 11. Thus, the collecting of sediment from the tank maycommence.
The level of sediment inside the collecting volume 11 may be monitored through theenergy usage of the screw conveyor. When there is increased resistance to the screwconveyor, increasing the energy usage indicates that the screw conveyor is pressingonto sediment that is not able to enter the collecting volume 11, and partially blockingthe flow of sediment into the volume 11, as the collecting volume 11 is about to befilled. The increase in energy usage may be utilised to trigger the automatic emptyingof the collecting volume or to provide indication to a user that the collecting volume fullor is close to being full.
Fig. 2 shows the apparatus 1 in sectional view along line ll-ll of Fig. 1, where the tankis shown as having a first and a second base wall 21, 22, that are angled downwardsfrom the lateral peripheral edges of the tank 2, in order to ensure that the particles sink¬ing in the liquid 8, in the direction of gravity B, are also forced or directed in the direc¬tion D,D’ towards the sediment collecting area 10. The height of the tank may be re¬duced, having a width that is larger than the height, so that the one tank may bestacked upon an identical tank, allowing the throughput of the cleaning apparatus to beincreased, by providing more settling tanks. The tanks may be stacked, so that thebase of the tank 24 abuts the peripheral edges 25,26 of the base walls 21,22.
The cylindrical element 23 of the sediment collecting area 10 may be a cylindrical tube23, that houses the screw conveyor 9, where the cylindrical tube 23 may have at leastone opening 27, that allows access from the tank and into the cylindrical element 23.The cylindrical element may have a plurality of opening 27, extending periodically alongthe length of the cylindrical element 23, so that sediment may enter into the cylindricalelement along the entire length of the tank, from the first end to the second end. Theopenings 27 may be discrete openings, which are drilled, stamped, bored, into the cy¬lindrical tube 23, so that there are areas between the openings that are intact, and al¬low the cylindrical element 23 to extend 360 degrees, in the cross sectional areaswhere there are no openings. This ensures that the cylindrical tube maintains it struc¬tural integrity, and does not deform from its original radial circumference, when open¬ings are arranged into the cylindrical tube 23.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK201370464A DK178361B1 (en) | 2013-08-27 | 2013-08-27 | An apparatus for removing supsended solids from liquids |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK201370464 | 2013-08-27 | ||
| DK201370464A DK178361B1 (en) | 2013-08-27 | 2013-08-27 | An apparatus for removing supsended solids from liquids |
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| DK201370464A1 DK201370464A1 (en) | 2015-03-16 |
| DK178361B1 true DK178361B1 (en) | 2016-01-11 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1716228A (en) * | 1926-09-07 | 1929-06-04 | James Q Horne | Continuous-settling device |
| DE508149C (en) * | 1926-04-04 | 1930-09-24 | W H Uhland G M B H | Procedure for the separation of starch, residues and fruit or washing water |
| DE524890C (en) * | 1928-06-26 | 1931-05-15 | Eisengiesserei Und Kesselschmi | Device for separating solids from a liquid stream |
| DE1007292B (en) * | 1953-01-09 | 1957-05-02 | Duisburger Kupferhuette | Method and device for separating solid slurry from Trueben by continuous settling and thickening |
| DE2617837A1 (en) * | 1976-04-23 | 1977-11-03 | Geb Hilsheimer Ingeborg Held | Sludge separation from water after flocculation - using a sludge chamber isolated from the main sepg. chamber |
| EP0469764A2 (en) * | 1990-08-01 | 1992-02-05 | British Nuclear Fuels PLC | Apparatus for grinding nuclear fuel pellets |
| DE19807116A1 (en) * | 1997-12-22 | 1999-06-24 | Roediger Anlagenbau | Process and plant for separating or separating heavy and light materials from a suspension |
| US6290842B1 (en) * | 1998-05-08 | 2001-09-18 | Organo Corporation | Coagulator |
| KR20020016604A (en) * | 2001-08-27 | 2002-03-04 | 손을택 | Process for high density waste water treatment |
| EP1518606A2 (en) * | 2003-09-23 | 2005-03-30 | Pertti Tommila | Flotation device for separating minerals from sand |
| DE202006003680U1 (en) * | 2006-03-09 | 2006-06-08 | Dürr Ecoclean GmbH | Apparatus for treating solids-containing backflushed fluid from a backflush filter includes a sedimentation unit for separating solids from the backflush fluid |
| KR100828945B1 (en) * | 2007-02-22 | 2008-05-13 | 충북대학교 산학협력단 | Process for treating mine wastewater using settling structure for nature type |
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2013
- 2013-08-27 DK DK201370464A patent/DK178361B1/en active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE508149C (en) * | 1926-04-04 | 1930-09-24 | W H Uhland G M B H | Procedure for the separation of starch, residues and fruit or washing water |
| US1716228A (en) * | 1926-09-07 | 1929-06-04 | James Q Horne | Continuous-settling device |
| DE524890C (en) * | 1928-06-26 | 1931-05-15 | Eisengiesserei Und Kesselschmi | Device for separating solids from a liquid stream |
| DE1007292B (en) * | 1953-01-09 | 1957-05-02 | Duisburger Kupferhuette | Method and device for separating solid slurry from Trueben by continuous settling and thickening |
| DE2617837A1 (en) * | 1976-04-23 | 1977-11-03 | Geb Hilsheimer Ingeborg Held | Sludge separation from water after flocculation - using a sludge chamber isolated from the main sepg. chamber |
| EP0469764A2 (en) * | 1990-08-01 | 1992-02-05 | British Nuclear Fuels PLC | Apparatus for grinding nuclear fuel pellets |
| DE19807116A1 (en) * | 1997-12-22 | 1999-06-24 | Roediger Anlagenbau | Process and plant for separating or separating heavy and light materials from a suspension |
| US6290842B1 (en) * | 1998-05-08 | 2001-09-18 | Organo Corporation | Coagulator |
| KR20020016604A (en) * | 2001-08-27 | 2002-03-04 | 손을택 | Process for high density waste water treatment |
| EP1518606A2 (en) * | 2003-09-23 | 2005-03-30 | Pertti Tommila | Flotation device for separating minerals from sand |
| DE202006003680U1 (en) * | 2006-03-09 | 2006-06-08 | Dürr Ecoclean GmbH | Apparatus for treating solids-containing backflushed fluid from a backflush filter includes a sedimentation unit for separating solids from the backflush fluid |
| KR100828945B1 (en) * | 2007-02-22 | 2008-05-13 | 충북대학교 산학협력단 | Process for treating mine wastewater using settling structure for nature type |
Also Published As
| Publication number | Publication date |
|---|---|
| DK201370464A1 (en) | 2015-03-16 |
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