WO2003027025A1 - Appareil et procede d'elimination de solides dissous et en suspension contenus dans des eaux usees au moyen de microbulles - Google Patents

Appareil et procede d'elimination de solides dissous et en suspension contenus dans des eaux usees au moyen de microbulles Download PDF

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Publication number
WO2003027025A1
WO2003027025A1 PCT/KR2002/001769 KR0201769W WO03027025A1 WO 2003027025 A1 WO2003027025 A1 WO 2003027025A1 KR 0201769 W KR0201769 W KR 0201769W WO 03027025 A1 WO03027025 A1 WO 03027025A1
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WO
WIPO (PCT)
Prior art keywords
foul
waste water
microbubbles
flotation
flotation tank
Prior art date
Application number
PCT/KR2002/001769
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English (en)
Inventor
In Chung
Original Assignee
In Chung
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 In Chung filed Critical In Chung
Publication of WO2003027025A1 publication Critical patent/WO2003027025A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/547—Tensides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0027—Floating sedimentation devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry

Definitions

  • the present invention relates to a foul/waste water treatment process and method for eliminating both dissolved solids and suspended solids using microbubbles and, more particularly, to a foul/waste water treatment process and method that can simultaneously eliminate both suspended solids and at least one kind of dissolved solids such as soluble chemical oxygen demand, NH 4 + -N, N0 2 ⁇ -N, N0 3 ⁇ -N, P0 4 3 ⁇ -P, color causing organics and the like by supplying microbubbles generated with a surfactant to the foul/waste water.
  • soluble chemical oxygen demand NH 4 + -N, N0 2 ⁇ -N, N0 3 ⁇ -N, P0 4 3 ⁇ -P, color causing organics and the like
  • foul/waste water contains suspended solids and dissolved solids including soluble chemical oxygen demand, NH + -N, N ⁇ 2 _ -N, N ⁇ 3 ⁇ -N, P0 3" -P, color causing organics and the like.
  • soluble chemical oxygen demand NH + -N, N ⁇ 2 _ -N, N ⁇ 3 ⁇ -N, P0 3" -P, color causing organics and the like.
  • Such a flotation method using microbubbles includes a Dissolved Air Flotation (DAF) method, an Induced Air Flotation (IAF) method, and a Cavitation Air Flotation (CAF) method. These processes are used for removal of SS in the market.
  • DAF Dissolved Air Flotation
  • IAF Induced Air Flotation
  • CAF Cavitation Air Flotation
  • a bubble generator generates microbubbles and supplies the bubbles into a reaction tank through a rotational bubble supplying tube, thereby floats solids on the water.
  • the bubble generator generates microbubbles using a mixture of a surfactant and a bubbling agent, and continuously supplies the microbubbles to a foul/waste water treatment process so that the impurities in the foul/waste water and the microbubbles are adsorbed chemically and physically through ionic reaction thereby forcing the impurities to float on the foul/waste water.
  • Korean Patent No. 163,659 claimed that their process can remove DS through ionic reactions.
  • microbubbles generated with a positively charged surfactant can remove NH + -N, N0 2 ⁇ ⁇ N, N ⁇ 3 ⁇ -N, and P0 3" -P at the same time. This proves that ionic reaction is not the correct phenomenon of DS removal.
  • a chemical agent for precipitating the dissolved matter to be eliminated should be first mixed with a foaming agent to generate the microbubbles.
  • This method has a problem in that mixing of chemical agent (precipitating specific dissolved solid) and a foaming agent is required for removal of specific dissolved solid.
  • the suspended and dissolved solids cannot be simultaneously removed.
  • sCOD soluble chemical oxygen demand
  • the present invention provides a foul/waste water treatment process comprising a first flotation tank for receiving foul/waste water to be treated; a second flotation tank for receiving effluent from the first tank for more elimination of contaminants; a microbubble generator(s) for generating and supplying microbubbles with a solution of a surfactant to each flotation tank; and a waste bubble collector for removing waste bubbles containing suspended solids and dissolved solids removed from the treated foul/waste water.
  • the foul/waste water treatment process may further comprise a line mixer disposed between each of the flotation tanks and the bubble generator(s) for mixing the foul/waste water and the microbubbles.
  • a third flotation tank for receiving foul/waste water from the second flotation tank and if required a fourth flotation tank for receiving effluent of the third flotation tank are provided with microbubbles generated by another bubble generator.
  • the bubbles are supplied to multiple bubble inlet tubes that are located on a sidewall of each of the tanks, and spaced away from each other at a predetermined distance.
  • the present invention provides a foul/waste water treatment method comprising the steps of supplying foul/waste water to at least two flotation tanks connected to each other; supplying microbubbles generated with a surfactant solution to the flotation tanks to mix the bubbles and the foul/waste water; chemically and physically adsorbing both suspended solids and at least one kind of dissolved solids selected from the group consisting of soluble chemical oxygen demand (sCOD), NH + -N, N0 2 " ⁇ N, N0 3 " -N,
  • sCOD soluble chemical oxygen demand
  • P0 4 3 ⁇ -P color causing organics and the like to microbubbles and letting waste(used) microbubbles to float to the top of the tank; and removing floated waste bubbles and directing treated foul/waste water to a next flotation tank so that the treated foul/waste water can be treated further in the next tank through the above steps.
  • FIG. 1 is a schematic view of a foul/waste water treatment process according to a preferred embodiment of the present invention.
  • FIG. 2 is a graph illustrating ammonium nitrogen (NH 4 + -N) removal efficiency of an inventive foul/waste water treatment process having four 40cm-high flotation tanks connected in series, a single 80cm ⁇ high flotation tank, and a single 160cm-high flotation tank;
  • NH 4 + -N ammonium nitrogen
  • FIG. 3 is a graph illustrating a concentration variation of suspended solids and sCOD in accordance with an amount of microbubbles supplied to an anaerobically treated distillery waste water; and
  • FIG. 4 is a schematic view of a foul/waste water treatment process according to another preferred embodiment of the present invention.
  • the invention foul/waste water treatment process comprises at least one or more flotation tanks (in this case 1, 2,
  • first, second, third and fourth flotation tanks 1, 2, 3 and 4 are connected in a series, and a height of each tank is greater than 40cm.
  • the height may be varied to 80cm, 160cm and the like as illustrated in another embodiment which will be described later.
  • the flotation tanks 1, 2, 3 and 4 have an identical structure to each other, the description on a structure and an operation with regard to the first flotation tank 1 will be referred herein.
  • a line mixer 5 for mixing foul/waste water with microbubbles.
  • the foul/waste water is introduced into the line mixer 5 through an intake tube 7 and the microbubbles is generated by an bubble generator 6 and introduced into the line mixer 5.
  • the bubble generator 6 generates microbubbles using solution made of only a surfactant without using any other addictives.
  • surfactant a variety of surfactant can be employed, preferred surfactants are as follows; an alkyl betain-based surfactant, alkyl amide-based surfactant, an alkyl ester-based surfactant, an alkyl phosphate-based surfactant, an alkyl ester sulfate-based surfactant, an alkyl oxide-based surfactant, an ammonium-based surfactant, an imidazolinium betain-based surfactant, and a polyethylene-based surfactant.
  • a surfactant solution is prepared by mixing the surfactant and tap water in a ratio of 1 :2,000 ⁇ 200: 1 ,000
  • the foul/waste water may be directly introduced into the first flotation tank 1 through a bypass line without passing through the line mixer 5 so that the solids can directly contact the microbubbles in the first flotation tank 1.
  • the foul/waste water and the microbubbles that have passed through the line mixer 5 are introduced into the first flotation tank 1.
  • the introduced foul/waste water passes through the first flotation tank 1 and the introduced microbubbles contact the foul/waste water and float to the top of the flotation tank.
  • the microbubbles adsorb/absorb chemically & physically suspended solids and DS such as sCOD and ammonium nitrogen and float toward the surface of the flotation tank.
  • a ratio of microbubbles to foul/waste water in the flotation tank 1 maintains 30% ⁇ 1,000%.
  • waste bubbles (used and contaminated bubbles) collector 9 for removing the floated suspended solids and DS such as sCOD and ammonium nitrogen.
  • waste bubble collector 9 comprises either a scraper or a skimmer for removing waste bubbles.
  • waste bubbles can be removed using the specific gravity of the bubbles themselves.
  • the collected waste bubbles containing suspended and dissolved solids are discharged outside through the waste bubble outlet tube 10.
  • the remained foul/waste water that is firstly processed in the first flotation tank 1 is directed to the second flotation tank 2 through a first outlet tube 11.
  • the foul/waste water is processed as in the first flotation tank 2.
  • the foul/waste water that is processed in the second flotation tank 2 is directed to third flotation tank 3, then to the fourth flotation tank 4.
  • Either gravitational flow method or a forced supply method using pumps can be used to direct the foul/waste water to the next tank.
  • the first to fourth tanks 1, 2, 3 and 4 can be arranged in a horizontal direction or a vertical direction.
  • Bubble generators 6, 12, 13, 14 are respectively mounted for each flotation tanks 1, 2, 3 and 4, thereby supplying generated microbubbles to each flotation tanks 1 , 2, 3 and 4.
  • an identical surfactant can be used for each of the bubble generators 6, 12, 13 and 14, or a variety of surfactants can be used in accordance with pollutants to be eliminated in each of the flotation tanks 1, 2, 3 and 4.
  • the suspended solids and the dissolved solids such as soluble chemical oxygen demand, NH 4 + -N, N ⁇ 2 ⁇ _ N, N ⁇ 3 ⁇ -N, P0 4 3 -P, chromatic materials and the like, and the ammonium nitrogen that are contained in the foul/waste water are simultaneously removed while the foul/waste water passes through the flotation tanks 1, 2, 3 and 4 contacting the microbubbles generated with the surfactant solution, whereby treated water is discharged through a discharge tube 15. That is, the foul/waste water passes through multiple flotation tanks 1, 2, 3 and 4, during of which the foul/waste water is mixed with microbubbles, thereby effectively removing suspended solids and DS such as sCOD and ammonium nitrogen.
  • soluble chemical oxygen demand NH 4 + -N, N ⁇ 2 ⁇ _ N, N ⁇ 3 ⁇ -N, P0 4 3 -P, chromatic materials and the like
  • the ammonium nitrogen that are contained in the foul/waste water are simultaneously removed while the foul
  • FIG. 2 shows a series of test results illustrating the removal efficiency of the suspended and dissolved solids and ammonium nitrogen under different conditions.
  • first case (A) four flotation tanks each having a height of 40cm are connected in series and fresh (unused) microbubbles are supplied to each flotation tanks.
  • a single flotation tank having a height of 80cm is provided and microbubbles half the amount of the microbubbles used in the case (A) are supplied to the tank.
  • a single flotation tank having a height of 160cm is provided and same amount of microbubbles are injected through the lower end of the tank.
  • a flotation tank with three bubble supply inlets shown in FIG. 4 is used with same amount of microbubbles.
  • the removal efficiency of ammonium nitrogen in the case (A) in which multiple flotation tanks are used is greatly better than those in the cases (B) and (C) in which a single and longer flotation tank is used. That is, the removing efficiency of ammonium nitrogen in the case (A) is .about 90% while it is about 50% in the cases (B) and (C) as can be seen in Figure 4.
  • the removing efficiency of the case (D) is somewhere between those of the cases (B and C) and the case (A).
  • the total nitrogen removal efficiency is 92.7%
  • suspended solids removal efficiency is 96.0%
  • sCOD removal efficiency is 80.4%.
  • 95.0% of color causing organics measured in color unit is removed.
  • the removal efficiency of color causing organics is insignificant until it passes through the second tank.
  • the removal efficiency of color causing organics is significantly increased after it passes through the third tank.
  • Table 3 shows treatment results of a settled supernatant of (anaerobically and then) aerobically treated distillery waste water by the inventive foul/waste water treatment process.
  • N0 2 _ N and P0 4 -P are not detected in the processed water. That is, it is noted that almost 100% of N ⁇ 2 ⁇ _ N and P0 4 3" -P are removed in the inventive process while 60% of N ⁇ 3 ⁇ -N is removed. This shows that P0 3 ⁇ -P, NH 4 + -N, N0 2 ⁇ -N, and N0 3 " -N can be economically removed simultaneously using the inventive process. [Table 3]
  • FIG. 3 shows a graph of concentration variations of suspended solids and sCOD in accordance with an amount of microbubbles supplied to anaerobically treated distillery waste water with the inventive foul/waste water treatment process.
  • SS concentration is gradually decreased, but sCOD is decreased and then begins to increase at some point. That is, it is not preferable to supply too much microbubbles, increasing sCOD and thus deteriorating sCOD removal efficiency. Therefore, the optimization of microbubbles supply is required.
  • FIG. 4 shows a schematic view of a foul/waste water treatment process according to another preferred embodiment of the present invention.
  • a single flotation tank 20 is provided, but the height thereof is heightened.
  • Multiple bubble intake tubes 21, 22 and 23 are formed on a sidewall of the flotation tank.
  • the intake tubes 21 , 22 and 23 are spaced away from each other at a predetermined distance.
  • the flotation tank 20 of this embodiment can improve the removal efficiency as indicated by D in FIG. 2.
  • a foul/waste water treatment process and method of the present invention has an advantage of simultaneously removing both the suspended solids and at least one kind of the dissolved solids selected from the group consisting of soluble chemical oxygen demand (sCOD), NH 4 + -N, N0 " -N, N0 3 ⁇ -N, P0 4 3" -P, chromatic materials and the like by supplying microbubbles generated by only a surfactant to the foul/waste water.
  • sCOD soluble chemical oxygen demand

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Water Treatments (AREA)

Abstract

L'invention concerne un procédé et un processus de traitement d'eaux usées/croupies permettant d'éliminer simultanément des solides dissous et en suspension au moyen de microbulles. Elle concerne, plus particulièrement, un procédé et un processus de traitement d'eaux usées/croupies permettant d'éliminer simultanément des solides en suspension et au moins un type soluble de matières organiques oxydables, sous forme de NH4+-N, NO2--N, NO3--N, PO43--P, de colorants organiques et de substances analogues, au moyen de microbulles appliquées aux eaux usées/croupies en présence d'un tensioactif. Le procédé de traitement d'eaux usées/croupies comprend de multiples réservoirs en série destinés à recevoir les eaux usées/croupies à traiter, des générateurs de bulles destinés à alimenter les réservoirs de flottation en microbulles en présence de tensioactif, et un collecteur de bulles souillées permettant d'éliminer les microbulles souillées qui contiennent, par liens physique et chimique, les solides en suspension et dissous.
PCT/KR2002/001769 2001-09-18 2002-09-18 Appareil et procede d'elimination de solides dissous et en suspension contenus dans des eaux usees au moyen de microbulles WO2003027025A1 (fr)

Applications Claiming Priority (2)

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KR2001/57675 2001-09-18
KR10-2001-0057675A KR100427594B1 (ko) 2001-09-18 2001-09-18 미세기포를 이용하여 하폐수에서 용존성 고형물과 부유성고형물을 동시에 제거하는 폐수처리 장치 및 방법

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8136800B2 (en) 2007-02-28 2012-03-20 Sharp Kabushiki Kaisha Device and method for increasing blood flow and insulin-like growth factor
US8317165B2 (en) 2008-10-10 2012-11-27 Sharp Kabushiki Kaisha Nanobubble-containing liquid producing apparatus and nanobubble-containing liquid producing method
CN113428927A (zh) * 2021-07-22 2021-09-24 燕山大学 一种去除制药废水中对乙酰氨基酚的方法
CN115477408A (zh) * 2022-09-29 2022-12-16 宁波方太厨具有限公司 一种净水机及该净水机的控制方法

Families Citing this family (3)

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KR100791778B1 (ko) * 2006-08-27 2008-01-03 손영호 육상 어류 양식장치 및 방법
KR100721709B1 (ko) * 2006-09-28 2007-05-25 덕암산업 주식회사 오수 개질 장치용 라인 믹서 및 상기 라인 믹서를 채용하는오수 개질 장치
KR100943813B1 (ko) 2009-11-09 2010-02-25 유현상 나노기포 및 응집제를 함유한 미세기포를 이용한 정체성 수역의 오염물 제거장치 및 제거방법

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US4203837A (en) * 1976-01-16 1980-05-20 Hoge John H Process for removal of discrete particulates and solutes from liquids by foam flotation
JPH0796290A (ja) * 1993-09-29 1995-04-11 Kanto Kumiai Kasei Kogyo Kk 廃水処理システム
US6322701B1 (en) * 1996-11-08 2001-11-27 Thocar Ltd. Water treatment process
JP2000042560A (ja) * 1998-08-03 2000-02-15 Haruo Kojima 淨水方法及び装置
US6491826B1 (en) * 1999-10-12 2002-12-10 Marine Biotech Incorporated Systems and methods for separation of organics from fluids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8136800B2 (en) 2007-02-28 2012-03-20 Sharp Kabushiki Kaisha Device and method for increasing blood flow and insulin-like growth factor
US8317165B2 (en) 2008-10-10 2012-11-27 Sharp Kabushiki Kaisha Nanobubble-containing liquid producing apparatus and nanobubble-containing liquid producing method
CN113428927A (zh) * 2021-07-22 2021-09-24 燕山大学 一种去除制药废水中对乙酰氨基酚的方法
CN115477408A (zh) * 2022-09-29 2022-12-16 宁波方太厨具有限公司 一种净水机及该净水机的控制方法
CN115477408B (zh) * 2022-09-29 2023-10-24 宁波方太厨具有限公司 一种净水机及该净水机的控制方法

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KR20030024455A (ko) 2003-03-26

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