• Title, Summary, Keyword: 폴리염화알루미늄

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Preparation of PAC for Water Treatment Chemicals Using Waste Aluminum Dross (알루미늄 폐드로스로부터 수처리응집제용 염화알루미늄 제조)

  • Park, Hyung-Kyu;Choi, Young-Yoon;Eom, Hyoung-Choon;Bae, Dong-Su
    • Journal of the Korean Institute of Resources Recycling
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    • v.15 no.5
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    • pp.52-56
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    • 2006
  • Waste aluminum dross was leached with hydrochloric acid to prepare PAC, poly aluminium chloride, used as water treatment chemicals. Metallic aluminum remained in the waste aluminum dross was dissolved into the hydrochloric acid solution. The solution could be used as PAC after adjusting the required alumina concentration and the basicity. Comparing to the conventional method far preparation of PAC using aluminum hydroxide, material cost could be saved in this method. Also, there is an additional merit in view of recycling of the waste aluminum dross by reducing the amount of waste dross to be landfilled.

Preparation of Alum and Poly Aluminum Chloride Using Waste Aluminum Dross (알루미늄 폐드로스를 재활용(再活用)한 Alum과 Poly Aluminum Chloride 제조(製造) 연구(硏究))

  • Park, Hyung-Kyu;Lee, Hoo-In;Choi, Young-Yoon
    • Journal of the Korean Institute of Resources Recycling
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    • v.16 no.5
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    • pp.3-7
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    • 2007
  • Waste aluminum dross was processed to prepare alum with sulfuric acid, and poly aluminum chloride(PAC) with hydrochloric acid. Metallic aluminum remained in the waste dross was dissolved into the sulfuric acid solution, and the solution could be used as alum for water treatment chemicals after adjusting the required alumina concentration and pH of the solution. Also, it was dissolved into the hydrochloric acid solution and processed to make PAC solution. Compared with the conventional method for preparation of alum and PAC using aluminum hydroxide, material cost could be saved in this method. Also, there is an additional merit in view of recycling of the waste aluminum dross by reducing the amount of waste disposed to landfill.

Synthesis of Improved Polyaluminumchloride and Its Coagulation Properties (개선된 폴리염화알루미늄의 합성 및 응집 특성)

  • Choi, Yong-Wook
    • Journal of the Korean Chemical Society
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    • v.48 no.3
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    • pp.273-282
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    • 2004
  • The synthetic technology of improved polyaluminiumchloride (IPAC) similar to characteristics of PACS was established with minimum expense for modifying existing production line. The conditions for activating silicate was studied before the synthesis of IPAC, and the IPAC was synthesised with raw materials such as aluminumhydroxide and concentrated hydrochloric acid, followed by adding activated silicate and alginate. The specification of product, chemical structure, and coagulating properties were tested by using specification testing method, instrumental analytical method, and Jar tester, respectively. As a result, the product, IPAC, contained aluminium oxide content more than 17%, and no precipitation was shown at all while the IPAC solution was preserved, and the larger floc and faster coagulation were represented compared to existing PAC under the same conditions. It was suggested that these synthetic technology could be applied to the existing production line for producing PAC without approximately cost raising factor because of adding sulfuric acid-activated silicate instead of sodium sulfate.

The Study on Manufacture of PACl(Polyaluminum Chloride) from Water Treatment Plant Sludges (정수장 슬러지(Alum Sludge)로부터 PACl(Polyaluminum Chloride) 응집제 제조에 관한 연구)

  • Kim, In-Bae;Lee, Sang-Bong;Kim, Dong-Youn;Kim, Boo-Gil
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.3
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    • pp.441-451
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    • 2000
  • Sludge produced from water treatment plants contains plenty of aluminum due to addition of coagulants, polyaluminum chloride(PACI) which has been widely used in most of water treatment plants. however. the whole of PACI is imported from other countries. In this research. the effective methods for recycling PACI from sludge of water treatment plants were developed and evaluated. Aluminum chloride hexahydrate($AlCl_3{\cdot}6H_2O$) was obtained by sparging HCl gas aluminum extracted from sludge using hydrochloric acid (HCI). This aluminum chloride hexahydrate was solidified by decomposition at $180^{\circ}C$. and dissolved in water to produce PACI. The optimum extraction rate was obtained at the condition of 10 minutes of reaction time. $105^{\circ}C$ of reaction temperature. 27.65%(W/W) of HCI concentration. The KS experiment proved that manufactured aluminum chloride hexahydrate was 98.7% degree and the recycled PACI coagulants agreed with the KS standard. The optimum temperature of decomposition was $180^{\circ}C$ and the basicity of the PACI was decided upon the extent of decomposition The compared experiments between purchased coagulant and manufactured coagulant presented that both coagulants had same performance for turbidity, DOC, $UV_{254}$ absorbance. and chlorophyll-a.

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A Study on Coagulation and MF Membrane Process for the Reuse of Sewage Effluent (하수처리장 방류수의 응집 및 정밀여과 처리공정에 관한 연구)

  • Paik, Ke-Jin
    • Journal of environmental and Sanitary engineering
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    • v.20 no.3
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    • pp.36-43
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    • 2005
  • Prior to the study of the sewage treatment methods, water quality for Gwangju sewage of fluent was investigated from January to December, 2004 for sewage water reuse. Monthly mean values of BOD, SS, turbidity, total phosphorus and color were 4.1 mg/L, 2.9 mg/L, 0.8 NTU, 1.3 mg/L, and 27 unit, respectively. Jar-test was performed to investigate the removal efficiency of pollutants under the coagulation conditions of fast mixing for 5 min, slow mixing for 15 min and precipitation for 1hr. Here, alum and polyaluminium chloride (PAC) were used as coagulants to reduce color, turbidity, total phosphorus (TP) and total organic carbon (TOC) in sewage effluents. The results showed that PAC gave better efficiency in removing turbidity and dissolved phosphorus than alum. It was also found from the relative molecular weight (RMW) distribution analysis that organic matter over 1,000 Dalton (Da) was easily removed by coagulation and subsequently MF treatment, while it was not effective for less than 500 Da. Based on tis result, Natural organic matter (NOM) with lower molecular weight (< 500 Da) may cause harmful disinfectant by-product (DBP) after chlorine treatment. Thus, activated carbon adsorption seems to be required for the complete removal of DBP in the hybrid system.

Synthesis and Characterizations of Aluminum Hydroxide Using NaOH Additional Amounts and Polyalmuniumchloride (Polyaluminumchloride와 NaOH 첨가량에 따른 수산화알루미늄 합성에 관한 연구)

  • Hwang, Dae Ju;Cho, Kye Hong;Choi, Moon Kwan;Ahn, Ji Whan;Han, Choon;Lee, Jong Dae
    • Korean Chemical Engineering Research
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    • v.48 no.2
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    • pp.205-211
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    • 2010
  • The water-sewage cohesion agent(polyaluminumchloride(PAC)) and NaOH were used to synthesize $Al(OH)_3$. For various additions of NaOH, characteristics of the synthesized $Al(OH)_3$ was analysed by XRD, SEM and PSA. According to XRD analysis, small amount of NaOH(NaOH:PAC=15g:100g) resulted in amorphous form of $Al(OH)_3$. By increasing NaOH(NaOH:PAC=20g:100g), the mixture of gibbsite(37%), bayerite(35%) and boehmite(28%) were produced. By adding more NaOH(NaOH:PAC=25g:100g), binary mixtures of gibbsite(67%) and bayerite(33%) were formed. Finally, high addition of NaOH(NaOH:PAC=30g:100g) gave the high concentration of gibbsite(gibbsite:bayerite=83:17). Also, SEM analysis indicated that the product featured the plate form with 20 and 30g of NaOH addition. Furthermore it was found that the particle size of the product decreased with the addition of NaOH.

Improvement of Water Treatment Efficiency by Poly Aluminum Chloride Overdosing in High pH Raw Water (폴리염화알루미늄 과량주입에 의한 고(高) pH 원수의 수처리효율 개선)

  • Lim, Jaecheol;Kim, Jinkeun
    • Journal of Korean Society of Water and Wastewater
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    • v.23 no.1
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    • pp.39-46
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    • 2009
  • A method to improve water treatment efficiency by coagulant overdosing for high pH raw water at a drinking water treatment plant (WTP) which had no pH adjusting facilities was investigated. Poly aluminum chloride (PACl) was used for coagulant, and turbidity removal efficiency was evaluated as a function of PACl dosage increases. pH and turbidity of supernatant of jar-tester were 7.10 and 0.50 NTU respectively, when the turbidity, pH, alkalinity, water temperature, conductivity of raw water were 1.75 NTU, 9.38, 46.5 mg/L, $6.4^{\circ}C$, $400{\mu}s/cm$, respectively. Turbidity of settled water was reduced from 2.18 NTU to 0.28 NTU (87% reduction) when PACl dosage was increased from 16 mg/L to 45 mg/L at a full scale WTP. This can be attributed to the recovery of coagulant efficiency by pH reduction with the increase of coagulant dose, however coagulation efficiency was reduced with the formation of Al(OH)4- by PACl addition at higher pH. Coagulant overdosing was proven to be a rapid and effective method for high pH raw water, which can be applied at drinking WTP.

Precipitation Behavior of Ammonium Vanadate from Solution Containing Vanadium (바나듐 함유 수용액의 암모늄바나데이트 침전거동 고찰)

  • Yoon, Ho-Sung;Chae, Sujin;Kim, Chul-Joo;Chung, Kyeong Woo;Kim, Minseuk
    • Journal of the Korean Institute of Resources Recycling
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    • v.28 no.5
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    • pp.42-50
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    • 2019
  • In this study, the precipitation reaction of vanadium and ammonium chloride in aqueous solution was investigated in order to recover vanadium. Ammonium metavanadate having a crystal structure of [$NH_4VO_3$] was precipitated from aqueous solution containing vanadium at pH 9.2 ~ 9.4, and ammonium polyvanadate having a crystal structure of [$(NH_4)_2V_6O_{16}$] was precipitated when the pH of the aqueous solution containing vanadium was adjusted with sulfuric acid. Ammonium polyvanadate [$(NH_4)_2V_6O_{16}$] precipitated at a temperature of $80{\sim}90^{\circ}C$ and pH 2, and at a temperature of $40^{\circ}C$ and pH 6 ~ 8 of aqueous solution. In the acidic region of aqueous solution pH 2, the vanadium content of the aqueous solution should be at least 3,000 mg/L and the precipitation temperature should be maintained at $80^{\circ}C$ or higher in order to obtain a precipitation ratio of 99% or more. When the ammonium vanadate was precipitated in the alkaline region, the vanadium content was more than 10,000 mg/L and the precipitation temperature was maintained at $40^{\circ}C$ to increase the precipitation ratio. Aluminum was not precipitated regardless of the vanadium content and pH of the aqueous solution. However, the iron component reacts with ammonium chloride to precipitate into ammonium jarosite. Therefore, Fe component must be preferentially removed in order to increase the recovery of vanadium.

Present Condition on the Recycling and Management for Waste Alkali (폐(廢)알칼리의 재활용(再活用) 현황(現況) 및 관리(管理) 방안(方案))

  • Sim, Yeon-Ju;Kim, Eui-Yong
    • Journal of the Korean Institute of Resources Recycling
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    • v.19 no.4
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    • pp.13-18
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    • 2010
  • Effort of reducing wastes and their recycling is increasing in worldwide. Especially, extreme care for alkali recycling is required because of its environmental pollution and its corrosive characteristics. In order to manage alkali wastes effectively, it is necessary to make quality standards for recycling products from the alkali wastes because there are no quality specifications yet. In this study, we selected several recycling candidates from the alkali wastes based on the analysis of the most recent data of the various industrial sites. As a result, the recycling candidates from the alkali wastes are sodium hydroxide, aluminum sulfate, poly aluminum chloride. It is believed that the proper management system for waste products is required in governmental point of view and it propagates positively for resolving various environmental issues.