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DOI : 10.17640/KSWST.2019.27.5.91 , Vol.27, No.5, 91 ~ 100, 2019
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| Title |
| Characterization of Sludge-based Adsorbent from Municipal Sewage Treatment Plants under Varying Pyrolysis Temperature |
| 신동철 Dong-chul Shin , 이예은 Ye-eunlee , 정윤아 Yoonahjeong , 유영석 Yeong-seokyoo , 김이태 I-taekim |
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| Abstract |
| This study explored carbonization characteristics of urban sewage treatment plant sludge based on the pyrolysis temperature (100~1,100℃) and evaluated the availability of sewage sludge biochar as an effluent organic matter(EfOM) adsorbent. At 1,100℃, the biochar satisfied the quality criteria of activated carbon with regards to arsenic, lead, and cadmium levels, and the fixed carbon ratio was 31%. Polar functional groups on the surface of the biochar decreased with increasing pyrolysis temperature, indicating that more nonpolar materials can be adsorbed on biochar. As the pyrolysis temperature increased, the adsorption capacity of nitrogen gas increased. Specifically, adsorption capacity at 900°C (pore volume 0.05234 ㎤/g) was 5 times higher than that of 1,100°C (pore volume 0.2463 ㎤/g). The pore size is widely distributed over 3 to 30 nm at below 900°C, while most pore sizes are transformed into mesopores less than 10 nm at 1,100°C. The Brunauer-Emmett-Teller (BET) surface area showed minor increases up to 900°C, but over 9 times increase was found at 1,100°C when it compared to the dried sewage sludge. Therefore, the sewage sludge biochar produced at 1,100°C in 1 hour is expected to be efficient adsorbent in reduction of mesopore size materials, such as EfOM(like as natural organic material(NOM)) |
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| Key Words |
| Adsorbent, Biochar, Critical temperature, Mesopore, pyrolysis, Sewage sludge |
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