• 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 sewage treatment agent capable of completely purifying wastewater containing fluorine and a treatment method thereof, wherein the sewage treatment agent is composed of calcium carbonate (CaCO 3 ) at a concentration of 15 to 25% in complex salt solution 20 5 to 80 parts by weight of calcium chloride (CaCl 2 ) is added to 35 parts by weight, and the calcium carbonate composite salt solution: calcium chloride is mixed at a ratio of approximately 1: 1.5-4, and the sewage treatment agent is added to the wastewater. Adding and stirring for 10-20 minutes; Adding hydrated lime (Ca (OH 2 )) to the stirred raw water to adjust pH to 6.5-8; Adding a conventional flocculant at a ratio of 2 to 4 ppm of the applied amount of the wastewater treatment agent and stirring the mixture for 10 minutes; And purifying sewage water according to the sewage water treatment method according to the present invention comprising the step of precipitating the reactants after the stirring to separate and discharge the supernatant water and sludge, unlike the conventional one step, even with a simple treatment process and a short treatment time. Not only fluorine but also harmful components in the wastewater can be completely purified, and the amount of sludge can be greatly reduced, and there is no toxicity and danger of the treatment agent, so it is easy for the user to handle, thus greatly contributing to the efficient treatment of the wastewater.
    公开号:KR19990030427A
    申请号:KR1019980061470
    申请日:1998-12-30
    公开日:1999-04-26
    发明作者:이제훈；김경희
    申请人:이제훈；주식회사 니드켐；
    IPC主号:
    专利说明:

    Wastewater treatment agent and its treatment method
    The present invention relates to a wastewater treatment agent and a treatment method thereof, and more particularly, to a wastewater treatment agent capable of completely purifying wastewater containing fluorine and a wastewater treatment method using the same.
    Unlike the related art, as the importance of environmental preservation has recently emerged, various drugs and treatment methods have been proposed to purify the wastewater according to tightening regulations on the discharge of the wastewater.
    Among them, the most representative method is calcined lime (Ca (OH) 2 ), which mainly uses two or more kinds of treatment agents to purify wastewater, but in this case, a multi-stage treatment process is required, and fluorine is completely removed. Electronic component factories that contain large amounts of fluorine, such as glass or semiconductor wafers in CRTs and LCDs, are washed and etched with fluorine mixtures, so that the wastewater discharged after such treatment contains significant amounts of fluorine. It was difficult to deal with this completely.
    In addition, when the wastewater is treated with slaked lime, a large amount of slaked lime is used, and thus, a large amount of sludge is generated, which causes a high cost of landfilling, which causes difficulty in treating the sludge.
    The present inventors have concentrated on long-term researches to solve the above-mentioned shortcomings, which are difficult to completely remove fluorine in industrial and domestic wastewater, especially wastewater discharged from electronic industrial complexes. Since it is possible to completely purify, it has been developed a wastewater treatment agent and a wastewater treatment method using the same, which is very simple and can effectively remove various harmful components in the wastewater including fluorine.
    That is, in the present invention, unlike the conventional wastewater treatment using slaked lime, by applying appropriately mixed with calcium chloride using calcium carbonate that has not been applied at all in the wastewater purification so far, not only the sludge amount is significantly reduced after the purification treatment. In addition to providing a function of dewatering sludge, it is possible to provide a high efficiency sewage treatment agent and a method for treating sewage using the same, which is easy to landfill sludge.
    The wastewater treatment agent according to the present invention is added to 20 to 35 parts by weight of a 15-25% aqueous solution of a complex salt composed mainly of calcium carbonate (CaCO 3 ), and 52.5 to 80 parts by weight of calcium chloride (CaCl 2 ) is added to the calcium carbonate complex salt. Aqueous solution: It is characterized by consisting of calcium chloride in the ratio of about 1: 1.5-4.
    Furthermore, according to the present invention, the wastewater treatment agent is added to a predetermined amount of wastewater and stirred for 10 to 20 minutes;
    Adding hydrated lime (Ca (OH 2 )) to the stirred raw water to adjust pH to 6.5-8;
    Adding a conventional flocculant at a ratio of 2 to 4 ppm of the applied amount of the wastewater treatment agent and stirring the mixture for 10 minutes; And
    It provides a wastewater treatment method comprising the step of precipitating the reactant after the stirring to separate the discharged supernatant and sludge.
    First, the wastewater treatment agent according to the present invention comprises 60 parts by weight of calcium carbonate, 98 parts by weight of magnesium carbonate (MgCO 3 ), 0.05 parts by weight of ferric oxide (Fe 2 O 3 ) and 0.05 parts by weight of sulfate (SO 4 2 ). A small amount of a complex salt solution was added to water, diluted with a 20% calcium carbonate complex salt solution, and then 150-400 g of calcium chloride was added to 100 g of the diluted solution. It is prepared by mixing and dissolving in a ratio of 4, and most preferably, 300 g of calcium chloride is added to maintain a ratio of 1: 3.
    That is, the calcium chloride added to the wastewater treatment agent of the present invention is mixed with the aqueous solution of calcium carbonate complex salt containing a small amount of magnesium carbonate as described above and melted together, and the amount thereof is 1.5 times or less than the amount of the aqueous solution of calcium carbonate complex salt. It is inferior in performance as a wastewater treatment agent because it is poor in performance, and when it is more than 4 times, the amount of calcium carbonate is relatively decreased, so that the coagulation effect is lowered.
    In addition, when the concentration of the complex salt solution is 15% or less, the reaction rate with fluorine decreases, which is inappropriate. When the concentration of the complex salt solution exceeds 25%, the viscosity of the suspension occurs when mixing with calcium chloride, resulting in stickiness, and the transfer of the wastewater treatment agent to the treatment facility is difficult. It is important to maintain this range because it is difficult to treat wastewater.
    The main reason for using calcium chloride in the wastewater treatment agent of the present invention is that it is most effective in removing fluorine present as sodium fluoride (NaF). In other words, sodium fluoride is produced as a white precipitate in the reaction with calcium chloride, and the reactor is not known yet.
    In addition, the coagulant that can be used is not particularly limited, and any conventional polymer coagulant may be applied.
    Hereinafter, the present invention will be described in order to make the present invention easier to understand, but the present invention is not limited thereto, and it is obvious that the present invention can be modified and modified within the scope of the accompanying claims and the spirit and scope of the present invention. (Parts in the examples represent weight percentages.)
    (Example)
    In order to make the sewage treatment agent according to the present invention, first, water was poured into a 60% aqueous solution of a calcium carbonate composite salt in which calcium carbonate, ferric oxide, and the like were mostly dissolved, and diluted with 20% concentration.
    To 57 g of this diluted calcium carbonate aqueous solution, 200 g of calcium chloride at 95% concentration was added to dissolve it sufficiently to form a wastewater treatment agent.
    500 ml of contaminated wastewater of pH 2-3 in a semiconductor wafer factory with 318.3 (mg / l) of fluorine was added to the four reactors as raw water, and 3000 ppm of sewage treatment agent prepared in the same manner as described above. , 6000 ppm, 8000 ppm and 8000 ppm were each added and added to the four reactors.
    Thereafter, the reaction time between the raw water and the wastewater treatment agent according to the present invention was reacted by stirring differently for 10 or 20 minutes.
    The treated raw water was sent to a pH adjusting tank, and lime was added as shown in Table 1, respectively, to maintain pH between 6.5 and 8.5, and then reacted for 20 minutes or 10 minutes, respectively.
    After the reaction, the same flocculant was added to all four tanks in the same amount of 1 ml and reacted uniformly for 10 minutes, and then precipitated in the precipitation tank for 1 hour. After that, the supernatant was purified and the raw water was purified. Above all, the fluorine content in the supernatant was investigated, and the result was as follows. It was confirmed that the content is very good sewage treatment.
    In addition, the sludge amount of the discharged sediment was also reduced by about 50% than usual, and unlike the usual, the amount of water in the sludge was very small, and landfilling was possible immediately.
    enemyReactorpH adjustment tankCoagulation tankSedimentation tankSuperiority pHFluorine concentration (mg / ℓ)Treatment amount (ppm)Reaction time (min)pHCalculated lime input (ppm)pHReaction time (min)Coagulant input amount (ml)Flocculation time (min)Settling time (hr)Fluorine Concentration (ppm) 2.2318.53000105.56007.120One10One10 ˝˝6000˝6.08008.010˝˝˝9.5 ˝˝8000˝6.09007.1˝˝˝˝7.2 ˝˝8000206.82507.6˝˝˝˝5.7
    As described above, according to the wastewater treatment agent and its treatment method according to the present invention, it completely discharges not only fluorine but also harmful components in the wastewater even with a simple treatment process and a drastic shortening of the treatment time. It can be greatly reduced and there is no toxicity and danger of the treatment agent, so it is easy for the user to handle, thus greatly contributing to the efficient treatment of sewage water.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] In the wastewater treatment agent for efficiently purifying not only the plant wastewater and domestic sewage but also the wastewater containing a large amount of fluorine emitted from the electronic industry factory,
    20 to 35 parts by weight of the mixed salt aqueous solution having a concentration of 15 to 25% mainly composed of calcium carbonate (CaCO 3 ), and 52.5 to 80 parts by weight of calcium chloride (CaCl 2 ) are added to the wastewater treatment agent: calcium chloride aqueous solution: calcium chloride The wastewater treatment agent which mixes in the ratio of about 1: 1.5-4.
    [2" claim-type="Currently amended] 5-20 to 80 parts by weight of calcium chloride (CaCl 2 ) is added to 20 to 35 parts by weight of a mixed salt aqueous solution having a concentration of 15 to 25% mainly composed of calcium carbonate (CaCO 3 ). Adding a predetermined amount of the sewage treatment agent, which is mixed at a ratio of 1.5-4, to the sewage raw water and stirring for 10 to 20 minutes;
    Adding hydrated lime (Ca (OH 2 )) to the stirred raw water to adjust pH to 6.5-8;
    Adding a conventional flocculant at a ratio of 2 to 4 ppm of the applied amount of the wastewater treatment agent and stirring the mixture for 10 minutes; And
    Precipitating the reactants after the stirring, the sewage treatment method characterized in that it comprises the step of separating and discharge the supernatant and sludge.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-12-30|Application filed by 이제훈, 주식회사 니드켐
    1998-12-30|Priority to KR1019980061470A
    1998-12-30|Priority claimed from KR1019980061470A
    1999-04-26|Publication of KR19990030427A
    2002-11-22|Application granted
    2002-11-22|Publication of KR100318661B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980061470A|KR100318661B1|1998-12-30|Wastewater treatment agent and its treatment method|
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