Mitigating Phosphorus Contamination from Livestock Farms with La-Containing Hydrochar Adsorbent

Strategic Insights -

Researchers from the Chinese Academy of Agricultural Sciences have developed a robust and effective recycle technology to mitigate environmental contamination from phosphorus releases in livestock and poultry farms. This technology, based on lanthanum-modified hydrochars (La-HCN), demonstrates unprecedented phosphorus adsorption capacities and fast uptake rates. The study highlights the importance of addressing environmental concerns in agriculture and provides a scalable solution for mitigating phosphorus contamination.

Key Takeaways:

  • Lanthanum-modified hydrochars (La-HCN) prepared via mechanochemical modification exhibit 96.8 mg g-1 phosphorus adsorption capacities and fast uptake rates (half-maximum absorption capacity in 1.5 min).
  • Presence of nitrogen in the hydrochars enhances ion electrostatic interactions between lanthanum and carbon, accelerating phosphorus adsorption.
  • Life cycle assessment (LCA) reveals that production of La-containing hydrochar requires fewer resources, has lower greenhouse gas emissions (171 kg CO2), and lower environmental impact compared to comparable adsorbent materials.
  • Phosphorus removal levels using La-HCN adsorbent on actual wastewater from livestock and poultry breeding farms reached an adsorption rate of 93.6%, exceeding sewage effluent standards of China, US EPA, and EU.
  • The developed technology demonstrates practicality and scope for mitigating phosphorus contamination from livestock farms.

Statistics:

  • Phosphorus adsorption capacities: 96.8 mg g-1
  • Fast uptake rates: half-maximum absorption capacity in 1.5 min
  • Greenhouse gas emissions: 171 kg CO2
  • Environmental impact: lower than comparable adsorbent materials
  • Phosphorus removal rate: 93.6%
  • LCA time period: one-animal one-year basis

Sources:

  • Biological Sciences: Separation and Purification Technology, August 2025;

359. (Elsevier, Radarweg 29, 1043 Nx Amsterdam, Netherlands.)

  • Researchers: Jiarui Wang, Chinese Academy of Agricultural Sciences, Institute of Environment and Sustainable Development in Agriculture, Beijing 100081, People's Republic of China.
  • Additional authors: Xiaocheng Wei, Weihan Wang, Haixin Guo, Yujun Shen, Hao Kong, and Richard Lee Smith Jr.