Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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A study on the Optimization of Sewage Sludge-based Adsorbent Carbonization Condition for Improving Adsorption Capacity of Hydrogen Sulfide (H2S)

황화수소(H2S) 흡착성능 증진을 위한 하수슬러지 기반 흡착제 탄화조건 최적화 연구

  • Choi, Sung Yeol (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Jang, Young Hee (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Kim, Sung Su (Department of Environmental Energy Engineering, Graduate School of Kyonggi University)
  • 최성열 (경기대학교 일반대학원 환경에너지공학과) ;
  • 장영희 (경기대학교 일반대학원 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Received : 2018.09.21
  • Accepted : 2018.10.10
  • Published : 2018.12.10
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Abstract

In this study, the optimization of carbonization conditions in manufacturing processes was performed to improve the absorption performance of sewage sludge based sorbent used for treating $H_2S$ out of all odorous substances generated by various environmental facilities. Adsorbents applied were manufactured from the sewage treatment plant under different carbonization conditions, such as temperature and heating rate, and the correlation between the adsorption performance and physical properties of the adsorbents was verified. As a result, the adsorption performance of sludge at $900^{\circ}C$ with a heating rate of $10^{\circ}C/min$ was the best, and the SEM and BET analysis revealed that specific surface area and characteristics of pore (size, volume) were major parameters for the adsorption. In addition, the effect of K ions used for improving the adsorption performance of the optimum carbonization condition sorbent was insignificant for the sewage sludge based sorbent.

본 연구에서는 각종 환경기초시설에서 발생하는 악취 유발물질 중 $H_2S$를 처리하기 위한 하수슬러지 기반 흡착제의 흡착성능 증진을 위해 제조조건 중 탄화조건 최적화에 대한 연구를 수행하였다. 적용되는 흡착제는 하수처리장에서 발생하는 슬러지를 온도 및 승온속도와 같은 탄화조건을 달리하여 제조하였으며, 흡착제의 물리적 특성과 흡착성능과의 상관관계를 확인하였다. 실험결과 $10^{\circ}C/min$의 승온속도로 $900^{\circ}C$의 온도에서 탄화과정을 거친 슬러지의 흡착성능이 가장 우수하였으며, SEM, BET 분석을 통해 비표면적 및 기공특성(기공크기, 부피)이 흡착성능의 주요 인자임을 확인하였다. 최적 탄화조건 흡착제의 흡착성능을 증진시키기 위해 K 이온을 담지하였으나, 하수슬러지 기반 흡착제의 경우 큰 영향이 없는 것으로 확인하였다.

Keywords

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Figure 1. Photograph of sewage sludge sample derived from ‘E’ sewage treatment plant.

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Figure 2. Manufacturing procedure of sewage sludge adsorbent.

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Figure 3. Schematic diagram of H2S adsorption test reactor.

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Figure 4. Effect of the carbonization temperature on H2S adsorption amount of H2S (g/g) for carbonized sludge adsorbents (Experimental condition: H2S = 20 ppm, O2 = 21%, R.H = 50-60%, adsorbent loadings = 0.03 g).

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Figure 5. Effect of the active material coating on H2S adsorption amount of H2S (g/g) for carbonized sludge adsorbents (Experimental condition: H2S = 20 ppm, O2 = 21%, R.H = 50-60%, adsorbent loadings = 0.03 g).

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Figure 6. Pore size distributions of different temperature carbonized sludge adsorbents.

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Figure 7. SEM images of different temperature carbonized sludge adsorbents. A: 550CS, B: 700CS, C: 900CS, D: K/900CS.

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Figure 8. Effect of the carbonization heating rate on H2S adsorption amount of H2S (g/g) for carbonized sludge adsorbents (Experimental condition: H2S = 20 ppm, O2 = 21%, R.H = 50-60%, adsorbent loadings = 0.03 g).

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Figure 9. Pore size distribution of different carbonization heating rate sludge adsorbents.

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Figure 10. SEM images of different carbonization heating rate sludge adsorbents. A: 900CS (5), B: 900CS (10), C: 900CS (20).

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Figure 11. Effect of the KOH activation on H2S adsorption amount of H2S (g/g) for carbonized sludge adsorbents (Experimental condition: H2S = 20 ppm, O2 = 21%, R.H = 50-60%, adsorbent loadings = 0.03 g).

Table 1. Concentration of Hydrogen Sulfide and Gas Composition by Source

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Table 2. Proximate Analysis of Sewage Sludge Sample

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Table 3. Manufacturing Conditions of Sewage Sludge Adsorbent Samples

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Table 4. Experimental Condition in a Fixed Bed Reactor

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Table 5. BET Analysis Results of Different Temperature Carbonized Sludge Adsorbents

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Table 6. BET Analysis Results of Different Carbonization Heating Rate Sludge Adsorbents

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