KR100589642B1 - The adsorbent of immobilized coal fly ash using polyacrylamide gel for phosphate removal from water and method of preparing the same - Google Patents
The adsorbent of immobilized coal fly ash using polyacrylamide gel for phosphate removal from water and method of preparing the same Download PDFInfo
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Abstract
본 발명은 폴리아크릴아미드 겔의 미세한 격자 중에 석탄비산재를 고정화하여 수중에 포함된 인을 제거하기 위한 흡착제의 제조방법을 제공하는 것으로, 좀 더 구체적으로는, 폴리아크릴아미드 겔 형성을 위한 아크릴아미드 단량체를 포함하는 수용액과 석탄비산재를 중합단계, 상기 석탄비산재는 염산을 이용한 산처리, 여과 및 건조 공정을 거친 후 사용하는 단계, 상기 혼합물을 고무튜브에 주입한 후 방치함으로써 중합되어 형성되는 폴리아크릴아미드 겔의 미세한 격자 중에 석탄비산재가 고정화된 담체를 형성하는 단계, 상기 담체를 세척한 후 일정한 크기로 절단하거나 펠릿화하는 단계, 및 건조하는 단계를 포함한다. 본 발명은 화력발전소에서 발생되는 폐기물인 석탄비산재를 폴리아크릴아미드 겔의 격자 내에 고정화시킴으로써 수중으로부터 인을 제거함에 있어서 석탄비산재를 효과적으로 사용할 수 있게 한다. 그 결과 본 발명은 화력발전소에서 발생되는 폐기물의 재활용을 촉진할 수 있게 한다.The present invention provides a method for preparing an adsorbent for removing phosphorus contained in water by immobilizing a coal fly ash in a fine lattice of a polyacrylamide gel. More specifically, the present invention provides a method for producing an adsorbent comprising an acrylamide monomer , A step of using the coal fly ash after an acid treatment with hydrochloric acid, a filtration and a drying step, and a step of using the polyacrylamide Forming a carrier immobilized with coal fly ash in the fine lattice of the gel, washing the carrier, cutting or pelletizing the carrier to a predetermined size, and drying. The present invention makes it possible to effectively use coal fly ash in removing phosphorus from water by immobilizing coal fly ash, which is a waste generated from a thermal power plant, in the lattice of the polyacrylamide gel. As a result, the present invention makes it possible to promote recycling of waste generated in a thermal power plant.
석탄비산재, 폴리아크릴아미드, 고정화, 흡착제, 산처리, 폐기물 재활용Coal fly ash, polyacrylamide, immobilization, adsorbent, acid treatment, waste recycling
Description
도 1은 고정화하지 않은 일반적인 석탄비산재 형상을 나타낸 비교예(도1a)와 염산 처리된 석탄비산재를 폴리아크릴아미드로 고정화한 흡착제 형상을 나타낸 실시예(도1b)의 사진이다.FIG. 1 is a photograph of a comparative example (FIG. 1A) showing a general coal fly ash material shape which is not immobilized and an embodiment (FIG. 1B) showing a shape of an adsorbent immobilized with hydrochloric acid-treated coal fly ash by polyacrylamide.
본 발명은 수중으로부터 인을 제거하기 위한 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제 및 이의 제조방법에 관한 것으로서, 보다 상세하게는, 산업폐기물인 석탄비산재를 재활용하기 위하여, 폴리아크릴아미드 수용액에 석탄 비산재를 첨가하여 중합체를 생성하며, 폴리아크릴아미드 겔의 미세한 격자 중에 석탄비산재가 들어가게 함으로써 고정화된 흡착제를 제조하였으며, 이를 이용한 수중에서의 인을 제거하는 흡착제를 제공하기 위한, 수중으로부터 인을 제거하기 위한 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제 및 이의 제조방법에 관한 것이다.The present invention relates to a polyacrylamide gel adsorbent in which phosphorus fly ash is immobilized for removing phosphorus from water and a method for producing the same. More particularly, the present invention relates to a method for recovering coal fly ash from industrial wastes, To produce a polymer, and a coal fly ash is contained in the fine lattice of the polyacrylamide gel to prepare an immobilized adsorbent. In order to provide an adsorbent for removing phosphorus in water using the same, A polyacrylamide gel adsorbent having a coal fly ash immobilized thereon, and a method for producing the same.
인은 호수나 저수지의 부영양화를 유발시키는 제한 인자로 알려졌으며, 하수 및 폐수 중의 인을 제거하는 여러 가지 방법이 개발되어 왔다. 일반적인 인 제거 방법은 물리적, 생물학적, 화학적 방법으로 구분된다. 물리적 방법에는 전기투석, 역삼투막, 여과 등이 있으나, 과다한 시설비와 높은 운전비의 문제가 있다. 그리고 활성슬러지 공법, A2O 및 SBR를 이용한 생물학적 방법은 미생물의 적응 시간, 혐기 및 호기 조건 등의 까다로운 운전 조작이 요구되므로, 이를 실제로 현장에서 적용하는데 어려운 점들이 발생된다. 또한 금속염, 석회 등을 이용한 화학적 침전방법은 운전시 다량의 화학약품 사용과 이때 발생되는 화학적 폐슬러지 처리에 의한 운전비용과 유지관리 측면에서 문제가 있다.Phosphorus is known to be a limiting factor in causing eutrophication of lakes and reservoirs, and several methods have been developed to remove phosphorus from sewage and wastewater. Common phosphorus removal methods are divided into physical, biological and chemical methods. Physical methods include electrodialysis, reverse osmosis membrane, filtration, etc., but there is a problem of excessive facility cost and high operating cost. Biological methods using activated sludge process, A 2 O, and SBR require complicated driving operations such as microbial adaptation time, anaerobic and aerobic conditions, which are difficult to apply in the field. In addition, the chemical precipitation method using metal salts and lime is problematic in terms of operation costs and maintenance due to the use of a large amount of chemicals during operation and the treatment of chemical waste sludge generated during the operation.
따라서, 환경친화적이면서도 실제 하수 및 폐수 처리 공정에서 경제적이고 운전이 쉬운 인 제거 방법의 개발이 요구되고 있다. Therefore, there is a demand for development of an eco-friendly and economical and easy-to-operate removal method in an actual sewage and wastewater treatment process.
한편, 석탄비산재는 석탄을 연료로 이용한 화력발전소에서 배출되는 산업폐기물로서 매년 일정량씩 증가하여 2010년에는 현재의 약 두 배인 600만 톤에 이를 것으로 추정되며, 이로 인하여 상당한 규모의 석탄비산재 처리장 부지가 소요되며, 그에 따른 투자비 증가, 환경훼손, 민원 발생 등으로 전원입지 확보를 더욱 어렵게 만드는 요인으로 작용할 것으로 예상되고 있다. Meanwhile, coal fly ash is an industrial waste generated from coal-fired thermal power plants, which is estimated to increase by a certain amount each year, reaching 6 million tons in 2010, which is twice the current level. As a result, the coal fly ash treatment plant site It is expected that it will make it more difficult to secure the location of power supply due to the increase of investment cost, environmental damage, and civil complaints.
우리나라에서는 시멘트 원료와 콘트리트 혼화재 등으로 약 60% 재활용되고 있으며, 나머지는 매립처리 되고 있다. 따라서 매립되는 석탄비산재를 효과적으로 재활용할 수 있는 기술이 요구되고 있다. In Korea, about 60% is recycled from cement raw materials and concrete admixtures, and the remainder is reclaimed. Therefore, there is a demand for a technology capable of effectively recycling the coal fly ash that is reclaimed.
최근에 석탄비산재를 이용하여 수 처리 공정에 적용하기 시작하였으며, 예로는 구리, 납 등의 중금속, 염료, 인의 제거에 사용되었다. 여기서 석탄비산재는 대부분 분말(powder)로서 수중의 현탁 상태에서 응집제로 사용되었으며, 이때 과량의 석탄 비산재가 필요하게 된다. 또한 처리 후 다량의 슬러지 발생되어서 이를 처리해야 하는 2차적인 환경 문제가 있다. Recently, it has been applied to water treatment process using coal fly ash, for example, to remove heavy metals such as copper and lead, dyes and phosphorus. Here, coal fly ash is mostly used as a coagulant in suspended state in water, which requires excessive coal fly ash. In addition, there is a secondary environmental problem in which a large amount of sludge is generated after the treatment and must be treated.
상기 석탄비산재를 사용하여 수중에서 인을 제거할 경우, 인의 제거효율이 낮으며 또한 제거효율의 향상을 위해서는 긴 반응 시간이 요구된다. 그리고 석탄비산재가 분말 형태로 존재하기 때문에 이를 이용한 수 처리 운전 과정에서 조업장 주변으로 석탄 비산재가 흩날리게 되어서 불필요한 양이 소모되는 등의 문제점이 있다.In the case of removing phosphorus in water by using the coal fly ash, the removal efficiency of phosphorus is low and a long reaction time is required to improve the removal efficiency. In addition, since coal fly ash is present in the form of powder, coal fly ash is scattered around the fishing boats during the water treatment operation using the coal fly ash, thereby consuming an unnecessary amount.
따라서 본 발명의 목적은 분말(power) 형태의 석탄비산재 사용에 의한 수처리 공정의 문제점 해결 및 산업폐기물인 석탄비산재의 재활용 방법을 제공하는 것이다. 보다 구체적으로 본 발명의 목적은 수중으로부터 인을 효과적으로 제거하기 위한 흡착제로서, 화력발전소에서 발생되는 폐기물인 석탄비산재가 폴리아크릴아미드 겔의 격자 내에 고정화된 흡착제를 제공하는 것이다.It is therefore an object of the present invention to provide a method for solving the problem of water treatment process by using coal fly ash material in the form of power and recycling method of coal fly ash as industrial waste. More specifically, an object of the present invention is to provide an adsorbent for effectively removing phosphorus from water, wherein the coal fly ash as waste generated in a thermal power plant is immobilized in a lattice of a polyacrylamide gel.
또한 본 발명의 목적은 이러한 흡착제의 제조방법을 제공하는 것이다.
It is also an object of the present invention to provide a process for producing such an adsorbent.
본 발명은 분말(power) 형태의 석탄비산재 사용에 의한 수처리 공정의 문제점 해결 및 산업폐기물인 석탄비산재의 재활용에 관한 것으로서, 석탄비산재가 고정화된 담체 제조방법 및 이를 이용하여 수용액에 포함된 인을 제거하는 흡착제를 제공하는 것이다. 본 발명의 방법은 폴리아크릴아미드 겔 형성을 위한 아크릴아미드 단량체를 포함하는 수용액과 석탄비산재와 중합하는 단계, 상기 석탄비산재는 염산을 이용한 산처리,여과 및 건조 공정을 거친 후 사용하는 단계, 상기 혼합물을 고무 튜브에 주입한 후 방치함으로써 중합되어 형성되는 폴리아크릴아미드 겔의 미세한 격자 중에 석탄비산재가 고정화된 담체를 형성하는 단계, 상기 담체를 세척한 후 일정한 크기로 절단하거나 펠릿화하는 단계, 및 건조하는 단계를 포함한다. The present invention relates to the problem of water treatment process by using coal fly ash material in the form of powder and recycling of coal fly ash which is an industrial waste, and it relates to a method of manufacturing a carrier immobilized with coal fly ash, And the adsorbent. The method of the present invention comprises the steps of: polymerizing with an aqueous solution containing an acrylamide monomer for forming a polyacrylamide gel and a coal fly ash, using the coal fly ash after acid treatment with hydrochloric acid, filtration and drying, Is injected into a rubber tube and allowed to stand to form a carrier on which a coal fly ash material is immobilized in a fine lattice of a polyacrylamide gel polymerized and formed, a step of washing the carrier and then cutting or pelletizing the carrier to a predetermined size, and drying .
상기 석탄비산재는 염산을 이용한 산처리, 여과 및 건조 공정을 거친 후 사용되는 것이 바람직하다. 그리고 상기 아크릴아미드는 바람직하게는, 상기 수용액을 기준으로 10~14중량%이고, 상기 아크릴아미드 단량체 수용액은 바람직하게는, 메틸렌비스아크릴아미드 0.5~1.0중량%, 테트라메틸에틸렌디아민 0.2~0.4중량% 및 포타슘퍼설페이트 0.15~0.20중량%를 포함하며, 상기 석탄비산재는 바람직하게는, 상기 수용액을 기준으로 50~60중량%이다. The coal fly ash is preferably used after acid treatment using hydrochloric acid, filtration and drying. The acrylamide is preferably 10 to 14% by weight based on the aqueous solution, and the aqueous acrylamide monomer solution is preferably 0.5 to 1.0% by weight of methylenebisacrylamide, 0.2 to 0.4% by weight of tetramethylethylenediamine, And 0.15 to 0.20% by weight of potassium persulfate, and the coal flyash is preferably 50 to 60% by weight based on the aqueous solution.
본 발명은 또한 상기의 방법에 의하여 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제를 제조하였으며, 이를 이용하여 수중으로부터 인 제거를 위한 흡착제를 제공한다.The present invention also provides a polyacrylamide gel adsorbent having a coal fly ash immobilized thereon by the above-mentioned method, and provides an adsorbent for phosphorus removal from water by using the same.
이하에서 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.
폴리아크릴아미드 겔은 분자생물학 분야에서 단백질의 분리 등에 사용되는 것으로 그 제조방법은 일반적으로 알려져 있다. 본 발명의 특징은 이러한 폴리아크릴아미드 겔의 제조과정에 산업폐기물인 석탄비산재를 함께 포함시켜 폴리아크릴아미드 겔의 격자 내에 석탄비산재를 고정화시킴으로써 분말(power) 형태의 비산재 사용에 따른 수중에서의 인 제거에 관한 문제점들을 극복하고, 고정화 석탄비산재를 이용하여 인 제거능력이 우수한 흡착제를 제공하는 것이다. BACKGROUND ART Polyacrylamide gels are used for separation of proteins in the field of molecular biology and the production method thereof is generally known. The characteristic feature of the present invention is that the coal fly ash as an industrial waste is included in the manufacturing process of the polyacrylamide gel to immobilize the coal fly ash in the lattice of the polyacrylamide gel, And to provide an adsorbent excellent in phosphorus removal ability by using immobilized coal fly ash.
본 발명에 따른 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제의 제조방법은 폴리아크릴아미드 겔 형성을 위한 아크릴아미드 단량체를 포함하는 수용액에 석탄비산재를 혼합하는 단계를 포함한다. The method for preparing a polyacrylamide gel adsorbent having a fly ash material immobilized thereon according to the present invention includes mixing a coal fly ash with an aqueous solution containing an acrylamide monomer for polyacrylamide gel formation.
이 때, 사용되는 석탄비산재는 산처리, 여과 및 건조한 후 사용되는 것이 바람직하다. 즉 석탄비산재를 70∼75℃의 수욕조에 넣고 11 M 염산을 이용하여 12시간 동안 산처리 공정을 수행한 후, 이를 여과시킴으로써 산처리된 석탄비산재를 얻는다. 그리고, 산처리된 석탄비산재는 120∼125℃의 건조기에서 12시간 동안 건조된다. 따라서 본 발명은 석탄비산재를 고온에서 산처리함으로써 화학적으로 개질하는 것을 포함한다. 석탄비산재는 70∼75℃의 고온에서 12시간 동안 11 M의 진한 염산과 반응하면, 수용액에서 과다한 수소 이온으로 인하여 석탄 비산재 표면의 양 전하(positive charge) 사이트(site)를 증가하게 된다. 그 결과, 음 전하(negative charge) 인산염 인(PO4 -)과의 결합하는 정전기적 인력(electrostatic force)으로 인하여 인의 제거 효율이 향상된다.At this time, the coal fly ash to be used is preferably used after acid treatment, filtration and drying. That is, the coal fly ash is placed in a water bath at 70 to 75 ° C, subjected to an acid treatment process using 11 M hydrochloric acid for 12 hours, and then filtered to obtain an acid treated coal fly ash. The acid-treated coal fly ash is dried in a dryer at 120 to 125 캜 for 12 hours. Accordingly, the present invention includes chemical modification by treating the coal fly ash with an acid at a high temperature. When the coal fly ash is reacted with 11 M of concentrated hydrochloric acid at a high temperature of 70 to 75 ° C for 12 hours, the positive charge site of the coal fly ash surface is increased due to excessive hydrogen ion in the aqueous solution. As a result, the removal efficiency of phosphorus is enhanced by the electrostatic force of bonding with the negative charge phosphate (PO 4 - ).
상기에서, 석탄비산재 첨가량은 수용액 100중량 기준으로 50∼60중량%의 양이 바람직하다. 석탄비산재 첨가량이 50중량% 미만이면 고정화된 담체를 쉽게 제조할 수 있으나, 석탄비산재의 농도가 낮기 때문에 이를 이용한 수 처리 공정에서 인의 제거효율이 떨어진다. 그리고 석탄비산재 첨가량이 60중량%를 초과하면 폴리아크릴아미드 수용액과 석탄비산재가 첨가된 혼합물의 점성이 높아져서, 주사기를 이용하여 상기 혼합물을 고무 튜브에 흡입시키기 어렵게 때문에 고형화된 담체를 얻을 수 없게 된다. The amount of the coal fly ash added is preferably 50 to 60% by weight based on 100% by weight of the aqueous solution. If the added amount of coal fly ash is less than 50% by weight, it is possible to easily produce a fixed carrier. However, since the concentration of coal fly ash is low, the removal efficiency of phosphorus in the water treatment process using the coal fly ash is low. If the added amount of the coal fly ash is more than 60% by weight, the viscosity of the mixture containing the polyacrylamide aqueous solution and the coal fly ash increases, and it becomes difficult to suck the mixture into the rubber tube by using a syringe.
아크릴아미드 단량체 수용액에서, 아크릴아미드(acrylamide) 단량체는 상기 수용액을 기준으로 10∼14중량%인 것이 바람직하다. 상기한 아크릴아미드(acrylamide)의 첨가량이 10중량% 미만이면 폴리아크릴아미드 겔이 쉽게 풀어져서 고정화 담체를 제조할 수 없고, 14중량%를 초과하면 빨리 굳어지기 때문에 석탄비산재가 포함된 고정화된 담체를 만들기가 어렵다. 즉, 폴리아크릴 아미드 겔의 격자 내의 공간이 줄어들어서 고정화시키기 위한 석탄비산재의 양이 적어지기 때문에 바람직하지 않다. 또한 상기 수용액은 아크릴아미드 단량체 외에도 중합 및 가교를 위하여 필요한 성분들이 포함된다. 이러한 성분들로서, 상기 수용액의 총 중량에 대하여 메틸렌비스아크릴아미드(N,N'-methylene-bis-acrylamide)는 0.5∼1.0중량%, 테트라메틸에틸렌디아민(N,N,N',N'-tetramethyl-ethylenediamine)는 0.2∼0.4중량%, 포타슘퍼설페이트(potassium persulfate)는 0.15∼0.20중량%를 첨가하여 폴리아크릴아미드 겔을 형성하는 것이 바람직하다.In the aqueous acrylamide monomer solution, the acrylamide monomer is preferably 10 to 14% by weight based on the aqueous solution. If the amount of the acrylamide added is less than 10% by weight, the polyacrylamide gel can not be easily solubilized and the immobilized carrier can not be prepared. If the amount exceeds 14% by weight, the polyacrylamide gel hardens quickly. Therefore, the immobilized carrier containing the coal fly ash Is difficult. That is, the amount of the coal flyash material for reducing the space in the lattice of the polyacrylamide gel and fixing it is not preferable. In addition to the acrylamide monomer, the aqueous solution also contains components necessary for polymerization and crosslinking. As such components, the amount of methylene bis-acrylamide (N, N'-methylene-bis-acrylamide) is preferably 0.5 to 1.0% by weight, the content of tetramethylethylenediamine (N, N ' -ethylenediamine) is added in an amount of 0.2 to 0.4 wt%, and potassium persulfate is added in an amount of 0.15 to 0.20 wt% to form a polyacrylamide gel.
이렇게 혼합된 혼합물을 중합 및 가교가 일어나기 전에, 주사기를 이용하여 고무 튜브에 주입한 후 방치하면 중합 및 가교가 일어나서 폴리아크릴아미드 겔의 격자 중에 석탄비산재가 고정화된다. 이 때, 혼합물이 고무 튜브 안에서 중합 및 가교에 의하여 고형화되며, 그 형태를 유지시킬 수 있는 것 바람직하다. 본 발명의 실험에서는 상기 혼합수용액을 10mL 주사기로 흡입한 후 지름이 5mm인 고무튜브에 넣고 이를 상온에서 30분간 방치하였다. Before the polymerization and cross-linking of the mixed mixture, the mixture is injected into a rubber tube by using a syringe, and then left to stand, polymerization and cross-linking occur, and coal fly ash is immobilized in the lattice of the polyacrylamide gel. At this time, it is preferable that the mixture is solidified by polymerization and crosslinking in a rubber tube and can maintain its shape. In the experiment of the present invention, the mixed aqueous solution was aspirated with a 10-mL syringe, put in a rubber tube having a diameter of 5 mm, and left at room temperature for 30 minutes.
고형화되어 얻어진 폴리아크릴아미드 겔은 수돗물로 세척한 후 일정한 크기로 절단되어 펠릿화가 이루어진다. 이렇게 얻은 펠릿을 건조함으로써 최종적으로 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제를 얻는다. 여기서, 수분이 충분히 제거된 흡착제를 제조하여 인 제거를 위한 수처리 공정에 적용하는 것이 바람직하다. 본 발명 실험에서는 고무튜브에서 중합 및 가교가 완료된 고형 흡착제를 칼을 이용하여 지름 4~5mm, 길이 3~4mm 되도록 절단한 후 70∼75℃ 건조기에서 12시간 동안 건조하여 수분을 제거함으로써 지름 3∼4 mm, 길이가 2∼3mm인 원통형 펠리트(pellet)를 얻었다. 도 1은 일반적인 석탄비산재(a)와 본 발명의 방법에 의하여 얻은 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제(b)를 비교한 사진이다. 도 1에서 펠릿 형태의 흡착제를 볼 수 있다. The polyacrylamide gel obtained by solidification is washed with tap water and then cut into a predetermined size to be pelletized. The pellet thus obtained is dried to finally obtain a polyacrylamide gel adsorbent having a coal fly ash material immobilized thereon. Here, it is preferable to prepare an adsorbent from which water has been sufficiently removed and apply it to a water treatment process for phosphorus removal. In the experiment of the present invention, a solid adsorbent polymerized and crosslinked in a rubber tube was cut using a knife to a diameter of 4 to 5 mm and a length of 3 to 4 mm, followed by drying in a dryer at 70 to 75 ° C for 12 hours to remove water, 4 mm and a length of 2 to 3 mm. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a photograph showing a comparison between a general coal fly ash (a) and a polyacrylamide gel adsorbent (b) on which a coal fly ash material immobilized by the method of the present invention is immobilized. In Fig. 1, adsorbents in the form of pellets can be seen.
이렇게 하여 얻은 본 발명의 석탄비산재가 고정화된 폴리아크릴아미드 겔 흡착제의 성능을 시험하기 위하여 수용액으로부터 인 제거 실험을 여러 조건에서 수행하였으며, 아래 표들에 제시한 결과들을 얻었다. In order to test the performance of the polyacrylamide gel adsorbent immobilized with coal fly ash of the present invention, phosphorus removal experiments from aqueous solutions were carried out under various conditions and the results shown in the following tables were obtained.
[표 1][Table 1]
*.초기 pH: 4, *.석탄 비산재: 1.8g, *. 조업온도: 30∼35℃Initial pH: 4, * Coal fly ash: 1.8 g, *. Operating temperature: 30 ~ 35 ℃
[표 2][Table 2]
*.초기 pH: 4, *.석탄 비산재 : 3.5g, *.조업온도: 30∼35℃ * Initial pH: 4, * Coal fly ash: 3.5 g, * Operating temperature: 30 to 35 ° C
[표 3][Table 3]
*.초기 pH: 4, *.석탄 비산재: 4.5g, *. 조업온도: 30∼35℃Initial pH: 4, * Coal fly ash: 4.5 g, *. Operating temperature: 30 ~ 35 ℃
[표 4][Table 4]
*.초기 pH: 4, *.석탄 비산재: 4.5g, *.조업온도: 30∼35℃ * Initial pH: 4, * Coal fly ash: 4.5 g, * Operating temperature: 30 to 35 ° C
상기 표들에서 보는 바와 같이, 본 발명의 흡착제가 분말(power) 형태의 일반적인 석탄비산재 보다 수용액으로부터의 인 제거 효율이 월등히 우수함을 나타내었다. 그리고 본 발명의 흡착제에 있어서, 염산 처리에 의하여 석탄비산재가 개질된 흡착제가 산처리가 이루어지지 않은 흡착제보다 수용액에서 인 제거 효율이 높음을 알 수 있었다. As shown in the above tables, the adsorbent of the present invention showed much better phosphorus removal efficiency from aqueous solution than general coal fly ash in the form of power. In the adsorbent of the present invention, it was found that the adsorbent modified with coal fly ash by hydrochloric acid treatment had a higher phosphorus removal efficiency in the aqueous solution than the adsorbent without the acid treatment.
본 발명은 산업폐기물인 석탄비산재를 폴리아크릴아미드 겔의 격자 내에 고정화시킴으로써 수중으로부터 인을 제거함에 있어서 석탄비산재를 효과적으로 사용할 수 있게 한다. 그 결과 본 발명은 화력 발전소에서 발생되는 폐기물의 재활용을 촉진할 수 있게 한다. 또한 본 발명에 사용된 석탄비산재의 고정화 흡착제를 충진층(packed -bed) 또는 유동층(fludized-bed) 반응기에 쉽게 적용시킬 수 있으므로, 인 제거를 위한 하수 또는 폐수 처리의 연속적인 공정(continuous process)에 응용시킬 수 있는 효과를 볼 수 있다.The present invention makes it possible to effectively use coal fly ash in removing phosphorus from water by immobilizing coal fly ash as industrial waste in the lattice of polyacrylamide gel. As a result, the present invention makes it possible to promote recycling of waste generated in a thermal power plant. In addition, since the immobilized adsorbent of coal fly ash used in the present invention can be easily applied to packed-bed or fludized-bed reactors, continuous treatment of sewage or wastewater treatment for phosphorus removal, It is possible to see an effect that can be applied to the present invention.
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