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Volume 42 Issue 2
Feb.  2024
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2024  >  42(2): 40-47
SHI En, ZHANG Shuai, ZHANG Miao, LIU Shasha, ZOU Yuliang, ZHANG Xiangzhi. ENVIRONMENTAL IMPACT ASSESSMENT OF SLUDGE-BASED ACTIVATED CARBON PREPARATION PROCESS BASED ON LIFE CYCLE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 40-47. doi: 10.13205/j.hjgc.202402005
Citation: SHI En, ZHANG Shuai, ZHANG Miao, LIU Shasha, ZOU Yuliang, ZHANG Xiangzhi. ENVIRONMENTAL IMPACT ASSESSMENT OF SLUDGE-BASED ACTIVATED CARBON PREPARATION PROCESS BASED ON LIFE CYCLE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 40-47. doi: 10.13205/j.hjgc.202402005
shu

ENVIRONMENTAL IMPACT ASSESSMENT OF SLUDGE-BASED ACTIVATED CARBON PREPARATION PROCESS BASED ON LIFE CYCLE

doi: 10.13205/j.hjgc.202402005

  • 1. School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China;

  • 2. School of Material Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China

  • Received Date: 2023-10-14
    Available Online: 2024-04-28
    Abstract
  • The preparation of activated carbon from sludge is a resourceful way to utilize sludge and with a wide range of applications. However, few studies have been conducted to evaluate the process of sludge-based activated carbon(SDAC) preparation. In this study, the activated carbon prepared from sewage plant sludge was used as an object, and a flow chart of the preparation process was established to quantitatively reveal the environmental impacts and key influencing factors of the preparation process by applying life cycle assessment(LCA). The results showed that the environmental impact of the roasting step dominated the whole preparation process, followed by the grinding or impregnation step, and then the washing and drying steps. The energy consumption of water vapor physical activation, CO2 physical activation, KOH impregnation, ZnCl2 impregnation, H3PO4 impregnation, ZnCl2 molten salt method, and physicochemical method were 68.976, 79.776, 47.376, 53.964, 48.564, 45.828, and 46.764 MJ/kg of activated carbon, respectively, whereas the values of global warming potential were 14.93, 17.06, 15.54, 13.42, 14.51, 12.65 and 13.91 kg CO2 eq/kg of activated carbon, respectively. The LCA results showed that the preparation of activated carbon using the CO2 physical activation method had the highest environmental impact, while the ZnCl2 molten salt method had the lowest environmental impact. The results of sensitivity analysis on the ZnCl2 molten salt method showed that electricity consumption and activator are the two key factors for further optimization of the activated carbon preparation method. Based on the life cycle perspective, the ZnCl2 molten salt method is more effective in preparing SDAC, and the energy-saving modification of the equipment should be strengthened, which can significantly reduce the environmental impact of the SDAC preparation process.
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