Effects of plasma treatment of digestates on pH, nitrification and nitrogen turnover during storage and after soil application

Nyang’au, Jared Onyango; Sørensen, Peter; Møller, Henrik Bjarne

doi:10.1016/j.eti.2024.103578

Cited by 7 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The NH 3 emissions increased proportionally as the biogas slurry application rates became higher. This observation aligns with the findings of previous studies [25,26]. The alkaline nature of the soil in this study, combined with the surface application of digestate, likely contributed to the higher NH 3 emissions.…”

Section: Effect Of Biogas Slurry Substitution On N Losssupporting

confidence: 93%

“…The alkaline nature of the soil in this study, combined with the surface application of digestate, likely contributed to the higher NH 3 emissions. The existing literature emphasizes that soil pH and nitrogen availability are key determinants of NH 3 emissions post manure application [26,27]. The study area's soil pH measured at 8.74, and the combination of watering and applying alkaline manure with a high NH 4 + content led to substantial NH 3 emissions.…”

Section: Effect Of Biogas Slurry Substitution On N Lossmentioning

confidence: 99%

See 1 more Smart Citation

Replacing Chemical Fertilizer with Separated Biogas Slurry to Reduce Soil Nitrogen Loss and Increase Crop Yield—A Two-Year Field Study

Zhao,

Fu,

Yao

et al. 2024

Agronomy

View full text Add to dashboard Cite

The application of biogas slurry in agriculture production is regarded as a sustainable method for mitigating the environmental impacts of fertilization. To investigate the effects of biogas slurry application on soil nitrogen loss and crop yield, a field plot experiment was conducted within a wheat–maize rotation system. This study assessed the effects of three levels of biogas slurry nitrogen substitution, 50% (BSF), 100% (BS), and 150% (EBS), on the yield of silage maize and wheat, nitrogen use efficiency, and soil nitrogen loss. The findings revealed that in the first year (characterized by high rainfall), the application of the biogas slurry led to increased NH3 emissions and nitrogen leaching, resulting in a notable rise in the annual nitrogen loss. Additionally, it was observed that as the amount of applied biogas slurry increased, the nitrogen loss also rose correspondingly. However, in the second year (a period of drought conditions), despite the elevated NH3 emissions from the biogas slurry, there was a significant reduction in nitrogen leaching, which resulted in reductions of 14.2% and 20.0% in annual nitrogen loss for the BSF and BS treatments, respectively, with comparable nitrogen input to the fertilizer treatment. Throughout both years, the application of biogas slurry did not decrease the yield of silage maize and wheat, and notably, the BS treatment even enhanced the crop nitrogen utilization efficiency. Compared with other nitrogen fertilizer treatments, the EBS treatment did not increase crop yield even with an increased nitrogen application rate; it also reduced the nitrogen utilization efficiency and N loss. In conclusion, employing biogas slurry to replace chemical fertilizer (equivalent nitrogen substitution) during drought years can enhance nitrogen utilization efficiency, reduce nitrogen loss, and sustain crop yield. When applying biogas slurry in years with substantial rainfall, effective measures should be implemented to mitigate nitrogen loss.

show abstract

Section: Effect Of Biogas Slurry Substitution On N Losssupporting

confidence: 93%

Section: Effect Of Biogas Slurry Substitution On N Lossmentioning

confidence: 99%

Replacing Chemical Fertilizer with Separated Biogas Slurry to Reduce Soil Nitrogen Loss and Increase Crop Yield—A Two-Year Field Study

Zhao,

Fu,

Yao

et al. 2024

Agronomy

View full text Add to dashboard Cite

show abstract

“…For PS and TPS, pig slurry was collected from an on-farm indoor pig facility and for TPS the pig slurry was then treated using plasma induction. The plasma treatment process uses electricity to ionise air and create nitrogen oxide gas, which combines with free NH 3 to form involatile ammonium nitrate, thus reducing NH 3 emissions and increasing the amount of inorganic N potentially available for immediate plant uptake upon application to the crop (Graves et al 2018;Nyang'au et al 2024). This may in turn reduce the amount of N available for conversion to N 2 O, thus reducing N 2 O emissions, however this is highly dependent on the environmental conditions and the crop type and growth stage.…”

Section: Field Site and Experimental Designmentioning

confidence: 99%

“…One such example of this is the treatment of organic fertilisers, such as pig slurry, with plasma induction. This treatment primarily aims to reduce losses of the non-GHG ammonia (NH 3 ) by ionising air to form reactive nitrogen gas which is absorbed into the slurry, creating an N-rich slurry (Nyang'au et al 2024). This process lowers the pH of the slurry and reduces the potential for NH 3 emissions (Nyang'au et al 2024).…”

Section: Introductionmentioning

confidence: 99%

“…This treatment primarily aims to reduce losses of the non-GHG ammonia (NH 3 ) by ionising air to form reactive nitrogen gas which is absorbed into the slurry, creating an N-rich slurry (Nyang'au et al 2024). This process lowers the pH of the slurry and reduces the potential for NH 3 emissions (Nyang'au et al 2024). An increase in the N content of the plasma-treated slurry means the product has the potential to replace synthetic inorganic fertiliser and has been shown to increase yields compared to untreated slurry (Mousavi et al 2022;Cottis et al 2023), as well as reducing both CH 4 and NH 3 emissions during storage (Graves et al 2018).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrous oxide and methane fluxes from plasma-treated pig slurry applied to winter wheat

Lloyd,

Grayson,

Galdos

et al. 2024

Nutr Cycl Agroecosyst

View full text Add to dashboard Cite

The use of livestock waste as an organic fertiliser releases significant greenhouse gas emissions, exacerbating climate change. Innovative fertiliser management practices, such as treating slurry with plasma induction, have the potential to reduce losses of carbon and nitrogen to the environment. The existing research on the effectiveness of plasma-treated slurry at reducing nitrous oxide (N2O) and methane (CH4) emissions, however, is not comprehensive, although must be understood if this technology is to be utilised on a large scale. A randomised block experiment was conducted to measure soil fluxes of N2O and CH4 from winter wheat every two hours over an 83-day period using automated chambers. Three treatments receiving a similar amount of plant-available N were used: (1) inorganic fertiliser (IF); (2) pig slurry combined with inorganic fertiliser (PS); (3) plasma-treated pig slurry combined with inorganic fertiliser (TPS). Cumulative N2O fluxes from TPS (1.14 g N m−2) were greater than those from PS (0.32 g N m−2) and IF (0.13 g N m−2). A diurnal pattern in N2O fluxes was observed towards the end of the experiment for all treatments, and was driven by increases in water-filled pore space and photosynthetically active radiation and decreases in air temperature. Cumulative CH4 fluxes from PS (3.2 g C m−2) were considerably greater than those from IF (− 1.4 g C m−2) and TPS (− 1.4 g C m−2). The greenhouse gas intensity of TPS (0.2 g CO2-eq kg grain−1) was over twice that of PS (0.07 g CO2-eq kg grain−1) and around six times that of IF (0.03 g CO2-eq kg grain−1). Although treating pig slurry with plasma induction considerably reduced CH4 fluxes from soil, it increased N2O emissions, resulting in higher non-CO2 emissions from this treatment. Life-cycle analysis will be required to evaluate whether the upstream manufacturing and transport emissions associated with inorganic fertiliser usage are outweighed by the emissions observed following the application of treated pig slurry to soil.

show abstract

Effect of slurry separation and air-plasma treatment on NH3 and VOC emissions from field applied biogas digestate and pig slurry to grassland

Pedersen,

Labouriau,

Feilberg

2024

Biosystems Engineering

View full text Add to dashboard Cite

Effects of plasma treatment of digestates on pH, nitrification and nitrogen turnover during storage and after soil application

Cited by 7 publications

References 29 publications

Replacing Chemical Fertilizer with Separated Biogas Slurry to Reduce Soil Nitrogen Loss and Increase Crop Yield—A Two-Year Field Study

Replacing Chemical Fertilizer with Separated Biogas Slurry to Reduce Soil Nitrogen Loss and Increase Crop Yield—A Two-Year Field Study

Nitrous oxide and methane fluxes from plasma-treated pig slurry applied to winter wheat

Effect of slurry separation and air-plasma treatment on NH3 and VOC emissions from field applied biogas digestate and pig slurry to grassland

Contact Info

Product

Resources

About