Effect of Pine Waste and Pine Biochar on Nitrogen Mobility in Biosolids

Journal of Environmental Quality
Dharini ParamashivamBrett H Robinson

Abstract

Humanity produces ∼27 kg of dry matter in biosolids per person per year. Land application of biosolids can improve crop production and remediate soils but may result in excessive nitrate N (NO-N) leaching. Carbonaceous materials can reduce the environmental impact of biosolids application. We aimed to ascertain and compare the potentials for Monterey pine ( D. Don)-sawdust-derived biochars and raw sawdust to reduce NO-N leaching from biosolids. We used batch sorption experiments 1:10 ratio of material to solution (100 mg kg of NH or NO) and column leaching experiments with columns containing biosolids (2.7% total N, 130 mg kg NH and 1350 mg kg NO) mixed with soil, biochar, or sawdust. One type of low-temperature (350°C) biochar sorbed 335 mg kg NH, while the other biochars and sawdust sorbed <200 mg kg NH. None of the materials sorbed NO. Biochar added at rates of 20 to 50% reduced NH-N (<1% of total N) leaching from columns by 40 to 80%. Nitrate leaching (<7% of total N) varied little with biochar form or rate but was reduced by sawdust. Incorporating dried sawdust with biosolids showed promise for mitigating NO-N leaching. This effect likely is due to sorption into the pores of the biochar combined with denitrification and im...Continue Reading

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Citations

Jul 21, 2017·Journal of Environmental Quality·Dharini ParamashivamBrett H Robinson
Oct 6, 2020·Journal of Environmental Quality·Yanyan LuMichel Cavigelli
Feb 9, 2017·Journal of Environmental Quality·Young-Nam KimNicholas Dickinson

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