• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a porous polyurethane foam carrier for biological wastewater treatment and a method for producing the same, and more particularly, at least one material selected from the group consisting of activated carbon, charcoal, ion exchange resin and natural clay in the porous polyurethane foam. The present invention relates to a supported porous polyurethane foam carrier for biological wastewater treatment and a method of manufacturing the same. Porous polyurethane foam according to the present invention has the ability to adsorb contaminants and form biofilm (biofilm) shows excellent performance as an immobilization carrier of microorganisms, mechanical properties such as abrasion resistance even when used as a carrier of biological wastewater treatment reactor for a long time It is excellent in that it can be used efficiently as a carrier for biological wastewater treatment such as industrial wastewater, livestock wastewater and domestic sewage, and can comply with wastewater discharge standards.
    公开号:KR20040021240A
    申请号:KR1020020052836
    申请日:2002-09-03
    公开日:2004-03-10
    发明作者:신원식；윤석민；장미향；김태훈
    申请人:재단법인 포항산업과학연구원；
    IPC主号:
    专利说明:

    POLYURETHANE FOAM FOR BIOLOGICAL WASTEWATER TREATMENT AND METHOD OF MANUFACTORING THE SAME
    [8] [TECHNICAL FIELD OF THE INVENTION]
    [9] The present invention relates to a porous polyurethane foam carrier for biological wastewater treatment and a method of manufacturing the same, and more particularly, to foaming polyurethane foam by adding activated carbon, charcoal, ion exchange resin, natural clay, etc. The present invention relates to a porous polyurethane foam carrier for biological wastewater treatment and a method for producing the same, which exhibit excellent performance and can efficiently treat wastewater biologically.
    [10] [Private Technology]
    [11] In general, in order to treat industrial wastewater, livestock wastewater, domestic sewage, and the like, microorganisms are attached and biologically treated using a carrier. To this end, conventionally used carriers include polyethylene (PE), polyurethane (PU), zeolite, ceramics and the like.
    [12] However, conventionally used carriers are difficult to adhere to microorganisms, and over time, a problem arises that removal efficiency is lowered due to wear caused by mechanical force.
    [13] In particular, when the ionic strength is strong, wastewater treatment efficiency is reduced, such as difficult attachment of microorganisms to the carrier.
    [14] Accordingly, an object of the present invention is to provide a porous polyurethane foam carrier having excellent biological wastewater treatment efficiency and a manufacturing method thereof in order to solve the problems of the prior art.
    [1] Figure 1 shows a photograph of a polyurethane foam loaded with activated carbon foamed with a nonionic surfactant (Tween) of the present invention,
    [2] Figure 2 shows a photograph of a polyurethane foam loaded with activated carbon foamed with anionic surfactant (SDS),
    [3] 3 is a photograph showing a polyurethane foam loaded with ion exchange resin,
    [4] 4 is a photograph showing a polyurethane foam loaded with montmorillonite,
    [5] 5 is a photograph showing a polyurethane foam loaded with zeolite,
    [6] FIG. 6 is a graph showing the biological treatment capacity of 50 ppm of nitric acid nitrate by the activated carbon-supported polyurethane foam carrier. FIG.
    [7] Figure 7 is a graph showing the biological treatment of 1000 ppm nitrate nitrogen by the activated carbon-supported polyurethane foam carrier of the present invention.
    [15] In order to achieve the above object, the present invention provides a porous polyurethane foam carrier for biological wastewater treatment in which at least one material selected from the group consisting of activated carbon, charcoal, ion exchange resin and natural clay is supported inside the porous polyurethane foam. do.
    [16] In addition, the present invention
    [17] a) dispersing at least one substance selected from the group consisting of activated carbon, charcoal, ion exchange resin and natural clay in an aqueous solution of polyurethane prepolymer,
    [18] b) a method of producing a porous polyurethane foam support for biological wastewater treatment comprising the step of adding an ionic surfactant or a nonionic surfactant to the dispersion aqueous solution obtained above and foaming.
    [19] Hereinafter, the present invention will be described in detail.
    [20] The present inventors have studied to solve the conventional problems, and found that a porous polyurethane foam carrier loaded with activated carbon, charcoal, ion exchange resin, natural clay, and the like can be efficiently applied to biological wastewater treatment. It became.
    [21] In the present invention, the material supported inside the porous polyurethane foam serves to provide a space for adsorption of contaminants, and the voids in the expandable polyurethane provide a space for microorganisms to attach and grow.
    [22] More specifically, in the present invention, the material supported in the polyurethane foam has a function of adsorbing contaminants to be removed and a function of forming a biofilm, which is a habitat for microorganisms, and thus is effective in treating biological wastewater. to be. In addition, polyurethane foam is effective in biological wastewater treatment because it has excellent physical and chemical properties such as abrasion resistance during long-term flow, and has a pore inside to provide a sufficient habitat space for microorganisms to grow.
    [23] Therefore, the foamable polyurethane foam of the present invention is wear-resistant even when used for a long time as a carrier of a packed bed reactor, a moving bed bioreactor (MBBR), a sequencing bacth reactor (SBR), a hybrid biological reactor (HBR), and the like. It has excellent mechanical properties and excellent performance as an immobilization carrier for microorganisms, which can biologically remove COD, BOD, nitrogen, phosphorus, etc. in wastewater.
    [24] The media material supported in the polyurethane foam is preferably selected from the group consisting of activated carbon, charcoal, ion exchange resin, and natural clay. The ion exchange resin includes Amberlite, XAD, and the like. The natural clay may be one or more selected from the group consisting of zeolite, smectite, montmorillonite, and bentonite.
    [25] The supported amount of the media material supported on the polyurethane foam is preferably 5 to 100 g / L based on the polyurethane. If the amount of the media material supported on the polyurethane foam is less than the above range, there is a problem in that the removal efficiency of the pollutant is lowered.
    [26] The method for producing a porous polyurethane foam carrier of the present invention includes the step of dispersing the supporting material in an aqueous solution of the polyurethane prepolymer, and adding an ionic surfactant or a nonionic surfactant to the dispersed aqueous solution to foam.
    [27] In the present invention, a commercial polyurethane prepolymer may be used for the production of polyurethane foam, and the polyurethane prepolymer may be prepared by reacting a bischloroformate compound with a diamine compound, or polytetramethylene glycol or polypropylene glycol. Polyol compounds, such as these, and a diisocyanate compound can be obtained as a main component. In addition, an initiator, a silicon foam stabilizer, a tin catalyst, an amine catalyst, and water may be added to prepare a porous polyurethane foam, but is not limited thereto. Examples of the polyurethane prepolymers include Hypol 2000 or Hypol 3000 (Dow Chemical CO.).
    [28] In the present invention, it is preferable to use a nonionic surfactant or an anionic surfactant as the initiator used in producing the polyurethane foam.
    [29] The nonionic surfactant may be a commercially available conventional one, preferably Tween 80, but is not limited thereto. The content of the nonionic surfactant is preferably used in 5 to 100 g / L with respect to the polyurethane.
    [30] The anionic surfactant may also be used as a conventional, preferably using SDS (sodium dodecyl sulfate), but is not limited thereto. The content of the anionic surfactant is preferably used in 5 to 100 g / L with respect to the polyurethane.
    [31] Hereinafter, examples of the present invention will be described. However, the following examples are for illustrating the present invention and the present invention is not limited to the following examples.
    [32] Example 1
    [33] (Production of Polyurethane Foam Carrier Supported with Activated Carbon Foamed with Nonionic Surfactant)
    [34] A commercial polyurethane prepolymer (Dow Chemical, Hypol 3000) was used for the preparation of the polyurethane foam, and activated carbon was used to make commercial activated carbon in uniform size using a 200 mesh sieve. 120 g of polyurethane prepolymer (Hypol 3000) was dissolved in 1 L of aqueous solution and then 30 g of activated carbon was dispersed. Thereafter, 55 g of a Tween 80 solution, which is a 30 g / L nonionic surfactant, was added to the aqueous dispersion solution and foamed to prepare a porous polyurethane foam carrier.
    [35] Example 2
    [36] (Production of Polyurethane Foam Carrier Supported with Activated Carbon Foamed with Anionic Surfactant)
    [37] In the same manner as in Example 1, a polyurethane foam carrier was prepared using 30 g of a sodium dodecyl sulfate (SDS) solution of 10 g / L anionic surfactant instead of a nonionic surfactant.
    [38] Example 3
    [39] (Production of Polyurethane Foam Carrier Supported with Ion Exchange Resin)
    [40] In the same manner as in Example 1, a polyurethane foam carrier was prepared using ion exchange resin instead of activated carbon.
    [41] Example 4
    [42] (Manufacture of Polyurethane Foam Carrier Supported with Montmorillonite)
    [43] The same method as in Example 1 was carried out, but instead of activated carbon, montmorillonite was used to prepare a polyurethane foam carrier.
    [44] Example 5
    [45] (Manufacture of Polyurethane Foam Carrier Supported with Zeolite)
    [46] In the same manner as in Example 1, a polyurethane foam carrier was prepared using zeolite instead of activated carbon.
    [47] Pictures of the porous polyurethane foam carriers prepared in Examples 1 to 5 are shown in FIGS. 1 to 5, respectively.
    [48] Experimental Example 1
    [49] In order to measure the nitrate nitrogen removal efficiency using the activated carbon-supported polyurethane foam prepared in Example 1, a batch reactor was used. A wastewater containing 50 to 1000 ppm of nitrate nitrogen was placed in a 2 L batch reactor, and an activated carbon carrying polyurethane with microorganisms was added thereto. After adding a small amount of methanol and stirring at 100 rpm to determine the concentration of nitrate nitrogen over time.
    [50] 6 and 7 are graphs showing the biological removal of nitrate nitrogen by microorganisms over time using polyurethane foam as a carrier. FIG. 6 is a graph showing the treatment ability at a low concentration with 50 ppm of nitrate nitrogen, and FIG. 7 is a graph showing the treatment ability at a high concentration with 1,000 ppm of nitrate nitrogen.
    [51] As shown in Figure 6 and 7, using the polyurethane foam of the present invention as a carrier it can be seen that the biological treatment of nitrate nitrogen of low concentrations and high concentrations are made efficiently.
    [52] As described above, the porous polyurethane foam according to the present invention has the ability to adsorb contaminants and form a biofilm, and thus exhibits excellent performance as an immobilization carrier for microorganisms, and is used as a carrier for biological wastewater treatment reactors for a long time. In addition, it is excellent in mechanical properties such as wear resistance, and when applied as a carrier for biological wastewater treatment such as industrial wastewater, livestock wastewater, domestic sewage, etc., it is possible not only to efficiently treat, but also to comply with wastewater discharge standards.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] A porous polyurethane foam carrier for biological wastewater treatment in which at least one material selected from the group consisting of activated carbon, charcoal, ion exchange resin, and natural clay is contained in the porous polyurethane foam.
    [2" claim-type="Currently amended] The porous polyurethane foam carrier for biological wastewater treatment according to claim 1, wherein the natural clay is at least one selected from the group consisting of zeolite, montmorillonite, bentonite, and smectite.
    [3" claim-type="Currently amended] The porous polyurethane foam support for biological wastewater treatment according to claim 1, wherein the material supported in the porous polyurethane foam has a supporting amount of 5 to 100 g / L based on the polyurethane.
    [4" claim-type="Currently amended] a) dispersing at least one substance selected from the group consisting of activated carbon, charcoal, ion exchange resin and natural clay in an aqueous solution of polyurethane prepolymer,
    b) A method of producing a porous polyurethane foam carrier for biological wastewater treatment comprising the step of adding an ionic surfactant or a nonionic surfactant to the dispersion solution obtained above and foaming.
    [5" claim-type="Currently amended] The method of claim 1, wherein the natural clay is at least one selected from the group consisting of zeolite, montmorillonite, bentonite, and smectite.
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    同族专利:
    公开号 | 公开日
    KR100472005B1|2005-03-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-09-03|Application filed by 재단법인 포항산업과학연구원
    2002-09-03|Priority to KR10-2002-0052836A
    2004-03-10|Publication of KR20040021240A
    2005-03-10|Application granted
    2005-03-10|Publication of KR100472005B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2002-0052836A|KR100472005B1|2002-09-03|2002-09-03|Polyurethane foam for biological wastewater treatment and method of manufactoring the same|
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