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Volume 41 Issue 3
Mar.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(3): 74-83
WANG Yuan, GUO Huajun, SHAO Yan, LIU Zihao, XIANG Hao, HU Guofeng, LI Honghu, HU Jiangjun. REMOVAL OF ELEMENTAL MERCURY USING MAGNETIC ADSORBENT PREPARED FROM SLUDGE FLOCCULATED WITH FERROUS SULFATE BY Mn ACTIVATION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 74-83. doi: 10.13205/j.hjgc.202303010
Citation: WANG Yuan, GUO Huajun, SHAO Yan, LIU Zihao, XIANG Hao, HU Guofeng, LI Honghu, HU Jiangjun. REMOVAL OF ELEMENTAL MERCURY USING MAGNETIC ADSORBENT PREPARED FROM SLUDGE FLOCCULATED WITH FERROUS SULFATE BY Mn ACTIVATION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 74-83. doi: 10.13205/j.hjgc.202303010
shu

REMOVAL OF ELEMENTAL MERCURY USING MAGNETIC ADSORBENT PREPARED FROM SLUDGE FLOCCULATED WITH FERROUS SULFATE BY Mn ACTIVATION

doi: 10.13205/j.hjgc.202303010

  • 1. WISDRI City Environment Protection Engineering Co., Ltd, Wuhan 430200, China;

  • 2. School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China;

  • 3. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China

  • Received Date: 2022-04-21
    Available Online: 2023-05-26
  • Publish Date: 2023-03-01
    Abstract
  • In this work, ferrous sulfate-flocculated sewage sludge (SFS) was activated by Mn(NO3)2 and then pyrolyzed to obtain magnetic adsorbent, which was adopted to remove elemental mercury (Hg0) from flue gas. Results showed that 1) O2 produced by the thermal decomposition of Mn(NO3)2 promoted the decomposition of FeC<em>x during primary pyrolysis of sludge, and that was conducive to the formation of high-valent metal oxides such as Mn4+and Fe3+. The gas produced by the decomposition of Mn(NO3)2 also showed the effect of pore expansion. With the addition of 10% Mn(NO3)2, the specific surface area of the adsorbent reached the maximum (88.5 m2/g), but when the Mn(NO3)2 amount continued to rise, it would produce many crystalline substances and then decreased the specific surface area of the adsorbent. 2) Mn10-SFS showed a maximum mercury removal efficiency of 92.7% at the reaction temperature of 150 ℃. 3) O2 could effectively supplement the active oxygen in the adsorbent, promoting the removal of Hg0, and presence of NO and a low SO2 concentration enhanced Hg0 removal, while H2O vapor and a high concentration of SO2 inhibited it. The Hg0 adsorption and desorption experiment showed that the adsorbent of Mn10-SFS exhibited good renewable recycling performance and stability. After Hg0 capture and regeneration for 5 cycles, the removal efficiency of the adsorbent was not notably degraded.
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