• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.257-262
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• 2000

The purpose of this study is grasping quality aggregate using Bottom Ash of Industrial Waste Incinerator, and is evaluating possibility of application as construction materials. Cement and Fly ash is used with binder of aggregates using bottom ash. It is tested for basic property and strength of artificial aggregates, and the results are compared with crushed stone and elution tests is done for environmental safety. In the results of tests, it is confirmed that basic property and strength are lowe than crushed stone but the aggregates have possibility of application as artificial lightweight aggregates. When it is manufactured with aggregates, it is sage environmentally because of protecting elution of harmful heavy metals.

• 한국세라믹학회지
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• 제52권2호
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• pp.159-164
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• 2015

We manufacture artificial lightweight aggregates (ALWAs) using bottom-ash as the primary raw material. We coat the ALWA surfaces with low-melting point materials in order to enable them to bloat, which is essential to reduce the bulk density of the aggregate. Then, we sinter the prepared aggregates at 1000, 1100, and $1200^{\circ}C$ using either the direct or two-step firing schedules. Finally, we evaluate the properties of the fired samples through analyzing their bulk density, water absorption, and microstructure. The surface-modified samples result in a reduction of their bulk density by $0.3{\sim}0.4g/cm^3$ regardless of the firing method used. Based on these results, we conclude that this approach could provide a viable method for the mass-production of ALWAs from industrial waste such as bottom-ash.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.296-300
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• 2001

In order to recycle the incineration ash (bottom ash and fly ash) generated from the incineration of municipal waste for a cement material, salts as well as heavy metal should be removed by the stabilization treatment. Most of these heavy metal and over 80% of salts are removed by a washing as a pre-treatment. However, wastewater which is another pollutant is generated by a washing, then proper treatment should be developed. First the characteristics of incineration ashes collected from two domestic full-sized incinerators were investigated and removal rate of salts and heavy metals from them also studied. The wastewater quality was compared to the criteria of the regulation by analyzing the characteristics of generated wastewater during the washing of incineration ash as a condition of liquid/solid ratio. Also, we tried to used this experimental results for the basic data to develop proper processing technique of municipal waste.

• 자원리싸이클링
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• 제11권4호
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• pp.27-36
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• 2002

생활폐기물의 소각으로 발생되는 바닥재(bottom ash)로 calcium-chloroaluminate($l1CaOㆍ7Al_2$$O_3$ㆍ$CaCl_2$)가 함유된 클링커를 제조한 후 이들 클링커의 수화반응성 및 보통 포틀랜드 시멘트와 혼합 사용할 때의 압축강도 및 중금속 용출특성을 연구하였다. 시약으로 calcium-chloroaluminate를 제조한 결과. calcium-chloroaluminate는 80$0^{\circ}C$부터 생성되며, $CaSO_4$ 및 $Ca(OH)_2$ 와의 수화반응에 의해 ettringite($3CaOㆍAl_2$$O_3$ㆍ$3CaSO_4$ㆍ$32H_2$O)가 생성된다. 4 mesh 이하의 바닥재를 분쇄하지 않고 온도별로 1시간 소성한 결과, 80$0^{\circ}C$부터 calcium-chloroaluminate가 30 mesh 이하의 입도에서 합성되었다. $1,000^{\circ}C$에서 소성한 30 mesh 이하의 바닥재에 무수석고($CaSO_4$)를 10 : 6의 중량비로 혼합한 후 이들 혼합물을 보통 포틀랜드 시멘트에 3～13 wt.% 첨가하여 제조한 모르타르의 압축강도를 측정한 결과, 이들 혼합물의 치환량이 11 wt.%까지 증가됨에 따라 보통 포틀랜드 시멘트의 압축강도보다 높았다. 각 모르타르 공시체를 1 mm 이하로 분쇄하여 중금속 용출시험 결과, 용출된 중금속의 농도는 환경규제치보다 낮았다.

• 한국건설순환자원학회논문집
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• 제3권3호
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• pp.252-260
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• 2015

본 연구의 목적은 석탄회 중 바텀애시를 이용하여 시멘트압출성형 패널에 잔골재대체재(보형성 유지)의 용도로 적용을 함으로써 산업 부산물을 처리함과 동시에 새로운 용도를 창출하기 위한 기초자료를 제시하는 것이다. 선행연구에서는 건식벽체로 사용되는 시멘트 압출성형 패널에 비정제 플라이애시를 시멘트계 재료로 대체하여, 최대 80%까지 대체가 가능하였다. 하지만, 압출성형체는 압출 직후 자중에 의해 약간의 침하가 발생을 하게 되는데, 이는 반응성이 느린 플라이애시를 대량 사용한 경우에 늦은 경화로 인한 것이다. 본 연구에서는 자중에 의한 침하에 저항하기 위한 용도로 바텀애시를 잔골재대체재로의 사용가능성과 최적사용량을 검토하였다. 그 결과 바텀애시의 대체율이 증가함에 따라 압출경화체의 압출성은 저하 되었지만 관입저항성은 증가하였다. 그러므로 기존의 자중에 의한 패널의 침하현상은 잔골재 대체재를 사용함으로써 보완이 가능하였다. 또한 바텀애시 대체율 20%, 최대 입자 크기 0.6mm, 오토클레이브 양생에서 적절한 강도특성을 발현하고 있다. 본 연구의 결과를 통해 차후 바텀애시의 활용방법이 확대되고, 바텀애시를 잔골재로 활용함으로서 부가가치 상승에 기여할 것으로 예상된다.

• 한국건축시공학회지
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• 제18권1호
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• pp.25-31
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• 2018

본 연구는 순환유동층보일러(CFBC)에서 발생되는 바닥재와 비산재를 활용한 저강도 고유동 채움재를 개발하였다. CFBC비산재(CFBC-F) 와 CFBC바닥재(CFBC-B)는 불규칙한 입자 형상을 가지고 있는 것과 유해성 분석결과 환경적으로 안정한 것을 확인하였다. CFBC-F가 첨가될 경우 단위수량이 증가하였다. 길이변화율은 기건양생 조건에서는 -0.05~-0.50% 범위의 수축이 발생하였으며, 밀봉양생 조건에서는 0.1~0.6%의 범위의 팽창이 발생하였다. 압축강도는 밀봉양생 조건에서는 장기적으로 수화반응을 진행할 수 있는 충분한 수분이 남아 있어 기건양생 조건 대비 압축강도가 증가 하는 것을 확인하였다. 본 연구에서 도출된 결과는 저강도 고유동 채움재 개발 및 CFBC 석탄재 활용에 있어 도움이 될 것이라 생각된다.

• 한국도로학회:학술대회논문집
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• 한국도로학회 2010년 추계학술대회 논문집
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• pp.325-328
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• 2010

• 한국지하수토양환경학회지:지하수토양환경
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• 제18권7호
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• pp.32-40
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• 2013

This study was objected to evaluate the potential impact on the groundwater environment of the coal bottom ash used as fill materials on the land surface. From four coal-fired power plants, bottom-ashes were collected and analyzed through sequential extraction and column leaching tests following the meteoric water mobility procedure. The column tests shown leaching heavy metals including Pb, As, B, Cu, Zn, Mn, Ni, Ba, Sr, Sb, V, Cr, Mo, and Hg. The relatively high concentrations of B, Sr, Ba, and V in leachate were attributed to both the higher concentrations in the bottom ash and the relatively higher portion of leachable state, sorbed state, of metals. Bottom-ash samples from the D-plant only show high leaching potential of sulfate ($SO_4$), probably originated from the coal-combustion process, called the Fluidized Bed Combustion. Consequently, to manage recycling bottom ashes as fill materials, an evaluation system should be implemented to test the leaching potentials of metals from the ashes considering the absolute amount of metals and their state of existence in ashes, and the coal-combustion process.

• 한국환경농학회지
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• 제41권4호
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• pp.310-317
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• 2022

BACKGROUND: The salt in soil interrupts crop growth. Therefore, water resources are used to remove any salt found in the soil. However, water resources have been reduced by global warming; thus, a new study is required into reducing the salt in soil. Recently, the bottom ash (BA) of a biomass power plant was found to be similar to biochar. Hence, it can be used to remove heavy metals and wastewater through the adsorption characteristics of BA. The objective of this study was to evaluate the improvement effects on crop growth in saline soil containing the BA from biomass power plants. METHODS AND RESULTS: The effect on crop growth in the saline soil supplemented with BA was studied with the crop-planted pots, which were packed by reclaimed greenhouse soils collected from Byolyang, Suncheon. The BA application level was 25, 50, 100, 200, and 400 kg/10a (referred as BA25, BA50, BA100, BA200, and BA400, respectively). The BA increased the fresh weights of the leaf and root, while nitrogen uptake increased by approximately 24-102% and 54-77%, respectively for the lead and root. The phosphorous uptake increased by 38%, although only in the leaf of the lettuce. In the case of soil, BA increased water content, pH, EC, CEC, and NH₄⁺ and the SAR of the soil decreased by 5-15%. The bottom ash increased the contents of Ca²⁺ and Mg²⁺, and fixed the amount of Na⁺. CONCLUSION(S): It was confirmed the bottom ash of a biomass power plant, based on wood pellets, improved crop growth, and increased the nutrient uptake of crops in saline soil. In addition, bottom ash, which has a wide range of porosity and high values of pH and EC, improved properties of the saline soil. However, the BA has a large amount of B, As, and heavy metals. Finally, it may require a study on the safety and contamination of heavy metals contained in the bottom ash, which would be applied in soil for a long time.

• Geomechanics and Engineering
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• 제16권1호
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• pp.105-112
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• 2018

This paper presents results of a compressive investigation conducted on weathered soil stabilized with ground bottom ash (GBA) and red mud (RM). The effects of water/binder ratio, RM/GBA ratio, chemical activator (NaOH and $Na_2SiO_3$) and curing time on unconfined compressive strength of stabilized soils were examined. The results show that the water/binder ratio of 1.2 is optimum ratio at which the stabilized soils have the maximum compressive strength. For 28 days of curing, the compressive strength of soils stabilized with alkali-activated GBA and RM varies between 1.5 MPa and 4.1 MPa. The addition of GBA, RM and chemical activators enhanced strength development and the rate of strength improvement was more significant at the later age than at the early age. The potential environmental impacts of stabilized soils were also assessed. The chemical property changes of leachate from stabilized soils were analyzed in terms of pH and concentrations of hazardous elements. The observation revealed that the soil mixture with ground bottom ash and red mud proved environmentally safe.