• 유기물자원화
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• 제21권4호
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• pp.44-49
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• 2013

한국의 중형 소각시설이 전체 소각로 개수의 약 90% 차지하는 실정에서 중형 소각시설의 다이옥신 저감운전기술을 확립하는 것은 매우 시급하다. 생활폐기물과 성상이 유사한 사업장 일반폐기물을 일 20톤 처리용량의 중형규모 구동화격자 스토커 소각시설에서 운전하면서, 각 공정별로 다이옥신 저감을 위한 최적 운전 인자를 도출하였다. CO튀는 현상의 최소가 다이옥신 배출저감에 운전최선책임이 밝혀졌다.

• 자원리싸이클링
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• 제15권5호
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• pp.38-46
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• 2006

The removal of arsenic(V) using four different natural minerals were evaluated. Parameters like contact time, pH, adsorbent dosages, and As(V) concentration were optimized. The kinetics of adsorption was observed to be fast and reached equilibrium within 2h. As(V) adsorption on studied minerals was dependent on pH and followed a pseudo-second-order reaction model. For kaolin, maximum adsorption was found at pH 5.0. Whereas, in case of other three minerals, a pH range of 6.0-7.0 was found to be the best for As(V) adsorption. The maximum adsorption capacity (Q) was calculated by fitting Langmuir equation to the adsorption isotherms obtained under a specified condition. From the slope of best fit, the Q values were calculated to be 2.07, 2.15, 1.95 and 0.86 mg As(V)/g of bauxite, wad, iron ore and kaolin, respectively. Desorption of As(V) from loaded materials was dependent on the type of leaching reagents used. Based on the results, it was found that among the studied natural minerals, wad was the best As(V) adsorbent.

• 상하수도학회지
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• 제25권2호
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• pp.257-264
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• 2011

Recycling of industrial products as the stabilizers can be proper handling of industrial products and has positive side in terms of recycling of wastes. In this study, the final aims were to evaluate the usability as stabilizer of Bio-solids which was generated from contaminated soil with heavy metals after primary process and to compare the treatment efficiency with slag being currently applied in many existing sites. Soluble and exchangeable forms have closely related to pollution of groundwater and plant growth and they can be used to determine the effect of the stabilization efficiency. Slag and Bio-solids were tested to investigate the capacity of stabilizing arsenic. Slag treatment process 4 (PS-ball 5%) showed higher leachate concentration rather to 0.84% compared to treatment 1 (blank) based on an average of 0.63%. The other hand treatment 4 (Bio-solids 5%) showed the lowest soluble and exchangeable forms to 0.57% when Bio-solids was applied to stabilize arsenic. Thus, the leaching of arsenic will be more reduced if the Bio-solids are used as stabilizer in stead of slag which is being currently used in many fields.

• 한국양식학회지
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• 제6권4호
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• pp.311-321
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• 1993

Ammonia accumulation is regarded as the limiting factor of the first priority in water qualities of aquatic culture systems. Nitrification efficiency and characteristics in seawater were evaluated using Rotating Biological Contactor (RBC) process as a part of the recycling water treatment facilities for marine fish culture system. Ammonia removal efficiency regarded 99.7 to $83.7\%$ at the ammonia surface loading rates of 48 to $393 mg/m^2$ -day. RBC process was able to withstand to the fluctuation of influent ammonia concentrations and loading and produced the stable effluent. The mathematical model on the fixed-film biological reactor developed by Kornegay seemed to be suitable to RBC process kinetic evaluation for the recycling water treatment of the marine fish culture system. Area capacity constant (P) and half-velocity constant (Ks) in the model were 0.188g/m^2$-day and 1.25mg/l, respectively.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.268-276
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• 2008

The status of contaminated soils vary widely ; therefore, the techniques and equipment applicable to the soil concerned should be selected and used after careful consideration. Hyundai Soil Washing is physical-chemical separation based on mining and mineral processing principles for removing a broad range of organic and inorganic contaminants from soil. Mobile plant(capacity 15 tons./hr) was installed for this project. The goals of this project were 1) to verify the applicability of the washing process, which showed reliable results in the pilot plant with various kind of contaminated soils and 2) to promote recycling of the washed soil as a backfill on site. The results revealed that $F^-$ and $Pb^{2+}$ in the soil were effectively washed out to a certain level which washed soil was acceptable for recyeling.

• 자원리싸이클링
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• 제24권6호
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• pp.54-60
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• 2015

본 연구의 목표는 1 ton/day용량의 연속 감압식 간접열 방식의 벨트형 건조장치를 개발하여 건조효율을 70% 이상 향상시키며 기존 건조기 장치에 비하여 약 50% 이상의 건조기 크기를 축소시켜 장치의 소형, 경량화를 이루고 그로 인한 설치비 및 운전비 절감효과를 20%이상 향상시키는 것이다. 현재는 기존의 간접열 건조장치를 분석하여 구조적인 개선점을 도출하였으며 기초실험을 통하여 우수한 건조성능을 확인하였다. 또한 감압조건에서의 실험을 수행하여 열전달 및 건조특성이 향상되는 것을 확인하였다.

• 자원리싸이클링
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• 제27권2호
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• pp.48-54
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• 2018

강염기성 음이온 교환 수지인 Amberlite IRA 402와 AG 1-X8로 염화암모늄용액에 함유된 금(III)의 이온교환을 회분식 실험으로 조사했다. 두 수지 모두 염화암모늄용액에서 금(III)을 잘 흡착했으며, AG 1X-8이 Amberlite IRA 402보다 우수한 금(III) 흡착거동을 보였다. AG 1-X8 수지의 금(III)의 흡착은 Langmuir 등온흡착과 잘 일치했고 흡착용량은 355 mg/g이었다. AG 1X-8에 흡착된 금(III)은 과염소산으로 세출할 수 있으며, 과염소산의 농도 증가에 따라 세출률이 증가하였다.

• 자원리싸이클링
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• 제8권1호
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• pp.37-43
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• 1999

본 연구는 망간단괴와 그로부터 유가금속을 침출한 잔사를 카드뮴 폐수의 흡착제로 이용하는 기초실험으로 초기 카드뮴 농도에 따른 흡착성을 살펴보았다. 또한 이를 Freundlich, Langmuir, Temkin 등온흡착식에 적용하여 각 흡착계를 설명하였다. 카드뮴 이온의 초기농도가 증가함에 따라 흡착량은 증가하였으나 흡착성은 점차로 감소하는 경향을 보였다. 이를 Freundlich, Langmuir 식에 적용한 결과, 선형성을 나타내었다. 그리고 Freundlich 식에서 흡착제의 흡착능력을 평가하는 k값은 망간단괴가 11.72로 제일 컸다. 망간단괴의 경우는 Langmuirtlr의 단분자층을 형성하여 흡착되는 흡착질의 최대흡착량인 $X_m$값또한 0.16으로 침출잔사, 잔사-생단괴 혼합, 활성탄에 비해 큼을 알 수 있었다.

• 유기물자원화
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• 제30권4호
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• pp.123-130
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• 2022

본 연구는 개인하수처리시설인 정화조 설치 증가에 따른 분뇨의 양이 지속적으로 증가될 것으로 예측되는 서울시 분뇨처리시설의 운영 및 개선안을 마련하고자 수행되었다. 그 결과, 현재 시설에 대한 처리용량 부족, 반입량 증가에 따른 문제점이 나타났으며 이를 개선하기 위하여 전반적인 분뇨처리시설 증설, 일부 시설에 대한 권역조정, 분뇨 원 단위의 현실화를 통한 분뇨 발생 감소방안, 오수처리시설의 형식변경에 따른 분뇨발생량 감소의 필요성이 요구된다.

• Nuclear Engineering and Technology
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• 제47권1호
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• pp.47-58
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• 2015

Four recycling scenarios involving pyroprocessing of spent fuel (SF) have been investigated for a 600-MWe transmutation sodium-cooled fast reactor (SFR), KALIMER. Performance evaluation was done with code system REBUS connected with TRANSX and TWODANT. Scenario Number 1 is the pyroprocessing of Canada deuterium uranium (CANDU) SF. Because the recycling of CANDU SF does not have any safety problems, the CANDU-Pyro-SFR system will be possible if the pyroprocessing capacity is large enough. Scenario Number 2 is a feasibility test of feed SF from a pressurized water reactor PWR. Thefsensitivity of cooling time before prior to pyro-processing was studied. As the cooling time sensitivity of cooling time before prior to pyro-processing was studied. As the cooling time increases, excess reactivity at the beginning of the equilibrium cycle (BOEC) decreases, thereby creating advantageous reactivity control and improving the transmutation performance of minor actinides. Scenario Number 3 is a case study for various levels of recovery factors of transuranic isotopes (TRUs). If long-lived fission products can be separated during pyroprocessing, the waste that is not recovered is classified as low- and intermediate-level waste, and it is sufficient to be disposed of in an underground site due to very low-heat-generation rate when the waste cooling time becomes >300 years at a TRU recovery factor of 99.9%. Scenario Number 4 is a case study for the recovery factor of rare earth (RE) isotopes. The RE isotope recovery factor should be lowered to ${\leq}20%$ in order to make sodium void reactivity less than <7$, which is the design limit of a metal fuel.