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Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization
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Published on: May 19, 2019

Treating solid dairy manure using microwave-enhanced advanced oxidation process.

Anju A Kenge1, Ping H Liao, Kwang V Lo

  • 1Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada.

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
|February 26, 2010
PubMed
Summary
This summary is machine-generated.

Microwave enhanced advanced oxidation process (MW/H(2)O(2)-AOP) effectively releases nutrients from dairy manure at pH 3.5. This treatment also reduces solids, with optimized orthophosphate measurement at 0.5% total solids (TS).

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Chemical Engineering

Background:

  • Dairy manure presents a significant waste stream requiring efficient treatment for nutrient recovery and solids reduction.
  • Advanced oxidation processes offer potential for breaking down complex organic matter in agricultural waste.

Purpose of the Study:

  • To investigate the efficacy of microwave-enhanced advanced oxidation process (MW/H(2)O(2)-AOP) for treating separated solid dairy manure.
  • To evaluate nutrient release and solids reduction under varying pH conditions using MW/H(2)O(2)-AOP.
  • To optimize the measurement of orthophosphate in dairy manure samples.

Main Methods:

  • MW/H(2)O(2)-AOP treatment was applied to dairy manure at 120°C for 10 minutes.
  • Experiments were conducted across three pH levels: 3.5, 7.3, and 12.
  • Hydrogen peroxide dosage was maintained at approximately 2 mL per 1% total solids (TS), ranging from 0.53-0.75 g H(2)O(2)/g dry sludge.
  • Analysis included orthophosphate, volatile fatty acids (VFAs), and soluble chemical oxygen demand (SCOD).

Main Results:

  • Substantial nutrient release into the solution was observed at pH 3.5.
  • Neutral and basic pH conditions primarily facilitated the release of VFAs and SCOD.
  • Orthophosphate concentration measurements in untreated samples were suppressed at higher % TS, necessitating measurement at 0.5% TS for accuracy.

Conclusions:

  • MW/H(2)O(2)-AOP is effective for nutrient release and solids reduction in dairy manure, particularly under acidic conditions (pH 3.5).
  • The process demonstrates potential for valorizing dairy manure by recovering valuable nutrients.
  • Accurate orthophosphate quantification requires careful consideration of sample total solids concentration.