Scholarlink

<p>Thermal treatment of hyperaccumulator biomass offers a promising route for volume reduction and energy recovery in phytoremediation systems, but poses challenges related to heavy metal emissions and ash management. This study investigates the combustion behavior of Sedum plumbizincicola, a Cd/Zn hyperaccumulator, in a pilot-scale fluidized bed reactor with air pollution control devices (APCDs) at temperatures ranging from 550 to 850&#xa0;°C. Volatility follows the order Cd ≫ Pb &gt; Zn, with Cd exhibiting peak emission at 850&#xa0;°C due to its low boiling point and high chloride affinity. Less than 80% of Cd was emitted into the particulate phase, while &gt; 80% of Zn and Pb showed enrichment in ashes—particularly in Cyclone-1. Energy-dispersive X-ray spectroscopy (SEM–EDS) analysis identified unburned carbon residues and cenospheres as key carriers for Zn, with concentrations reaching up to 16.8 wt%, attributed to both biological accumulation and vapor-phase condensation. The high chlorine (4600&#xa0;mg/kg) and potassium content in the biomass also raised concerns regarding slagging, fouling, and corrosion. However, the resulting fly ash may require stabilization before disposal or valorization. This study underscores the need for integrated strategies balancing emission control, ash safety, and resource recovery in the thermal valorization of phytoextraction biomass.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermal Treatment of Hyperaccumulator Biomass: Heavy Metal Emissions and Ash Characteristics from Sedum Plumbizincicola in a Fluidized Bed Reactor

  • 期刊论文

  • 发表日期：

    2026年3月9日

查看全文
  • Daoxu Zhong,
  • Shui Wang,
  • Yuhan Shen,
  • Longhua Wu,
  • Liu Wei

摘要

Thermal treatment of hyperaccumulator biomass offers a promising route for volume reduction and energy recovery in phytoremediation systems, but poses challenges related to heavy metal emissions and ash management. This study investigates the combustion behavior of Sedum plumbizincicola, a Cd/Zn hyperaccumulator, in a pilot-scale fluidized bed reactor with air pollution control devices (APCDs) at temperatures ranging from 550 to 850 °C. Volatility follows the order Cd ≫ Pb > Zn, with Cd exhibiting peak emission at 850 °C due to its low boiling point and high chloride affinity. Less than 80% of Cd was emitted into the particulate phase, while > 80% of Zn and Pb showed enrichment in ashes—particularly in Cyclone-1. Energy-dispersive X-ray spectroscopy (SEM–EDS) analysis identified unburned carbon residues and cenospheres as key carriers for Zn, with concentrations reaching up to 16.8 wt%, attributed to both biological accumulation and vapor-phase condensation. The high chlorine (4600 mg/kg) and potassium content in the biomass also raised concerns regarding slagging, fouling, and corrosion. However, the resulting fly ash may require stabilization before disposal or valorization. This study underscores the need for integrated strategies balancing emission control, ash safety, and resource recovery in the thermal valorization of phytoextraction biomass.

Graphical Abstract