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Updated: Sep 26, 2025

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Treating Agricultural Runoff with a Mobile Carbon Filtration Unit.

Bryn M Phillips1, Laura B McCalla Fuller2, Katie Siegler2

  • 1Department of Environmental Toxicology, Marine Pollution Studies Laboratory, University of California Davis, 34500 Highway One, Monterey, CA, 93940, USA. bmphillips@ucdavis.edu.

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Biochar filtration effectively removes over 99% of pesticides from agricultural runoff, maintaining over 50% efficacy for 34 weeks. This method significantly reduces water toxicity, offering a sustainable solution for managing pesticide pollution.

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Area of Science:

  • Environmental Science
  • Agricultural Engineering
  • Water Quality Management

Background:

  • Agricultural runoff, including pesticides like organophosphates, pyrethroids, and neonicotinoids, significantly impairs water quality in California.
  • Conventional Vegetative Treatment Systems (VTS) are often ineffective against water-soluble pesticides and may conflict with food safety regulations.
  • Biochar filtration shows promise for removing soluble contaminants, particularly when integrated with existing treatment systems.

Purpose of the Study:

  • To evaluate the efficacy of a mobile biochar filtration system in treating agricultural drainage water.
  • To assess the longevity and performance of biochar under field conditions for pesticide removal.
  • To determine the impact of biochar treatment on the toxicity of agricultural runoff.

Main Methods:

  • A mobile biochar filter system (600L biochar) was used to treat agricultural runoff from a 437-hectare drainage area.
  • Input and output water samples were analyzed for pesticide concentrations, nutrient levels, and aquatic toxicity using standard laboratory tests.
  • Toxicity was assessed using indicator species: Ceriodaphnia dubia, Hyalella azteca, and Chironomus dilutus.

Main Results:

  • Biochar filtration initially reduced pesticide concentrations by over 99%.
  • Treatment efficacy declined linearly, with an expected 50% effectiveness for up to 34 weeks.
  • Significant toxicity in 6 out of 16 samples was reduced to non-toxic levels; however, nutrients were not affected.

Conclusions:

  • Mobile biochar filtration is a viable technology for effectively removing pesticides and reducing toxicity in agricultural runoff.
  • The study provides valuable data on the field longevity of biochar performance in treating complex agricultural chemical mixtures.
  • Biochar offers a promising alternative or supplement to VTS for managing water-soluble pesticide contamination.