effect of wood biochar amendment to sand on leachate water quality with repeated dairy manure...
TRANSCRIPT
Effect of Wood Biochar Amendment to Sand on Leachate Water Quality
with Repeated Dairy Manure Application: A Soil Column Study
Alysa BradleyUW-Madison, WI
April 2, 2015
Presentation Outline Introduction
Experimental Design
Leachate Results
Retention Results
Conclusions
Limitations and Recommendations for Future Work
Introduction
Introduction
Biochar - a carbon-rich substance produced as a co-product by the thermal degradation of organic matter under a limited supply of oxygen.
Experimental Design: Biochar
• Hybrid poplar chips
• Slow pyrolysis at 450°C
• Applied at rates of 1, 2 and 5 % by weight.
Experimental Design: Soil columns
5% 2% 1% 0% C
Experimental Design: Leaching – Volume
– pH
– Biological Oxygen Demand (BOD5)
– Nitrite (NO2)
– Nitrate+Nitrite (NO3+NO2)
– Total Phosphorous (TP)
– Total Nitrogen (TN)
– Total Kjeldahl Nitrogen
– Ammonia
5% 2% 1% 0% C
Leachate Results: pH
Leachate Results: BOD5
Leachate Results: Cumulative TN
Leachate Results: Cumulative NO3
Leachate Results: NO3
Concentration
Leachate Results: Cumulative Ammonia
Leachate Results: Cumulative TP
Nutrient Retention Results: N
Nutrient Retention Results: TP
ConclusionsHybrid poplar biochar in sand:
• Increased leachate pH
• Decreased leachate BOD5
• Decreased leachate nitrogen
• Some increased TP in leachate
Limitations and Recommendations• Limitations• Simulated precipitation• Relatively constant temperature• No plantings• No measured soil emissions
• Recommendations• N cycling and mechanisms for change• Effect on emissions and crop yields• Field trials• Alternative application strategies
Questions?