Acidification of animal slurry– a review

Fangueiro, David; Hjorth, Maibritt; Gioelli, F.

doi:10.1016/j.jenvman.2014.10.001

Cited by 237 publications

(216 citation statements)

References 82 publications

(126 reference statements)

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“…These values were significantly lower than when the digestate was not acidified (D and D+NI), resulting in NH 3 losses of more than 27% of the total applied N ( Table 4). High NH + 4 content and pH of the digestate facilitate N losses via NH 3 volatilization (Fangueiro et al, 2015a;Möller, 2015) that can account up to more than a 40% of the total applied N if not managed carefully (e.g., Riva et al, 2016;Nicholson et al, 2017). Our results for the digestate treatments when the digestate was not acidified (D and D+NI) are consistent with these studies.…”

Section: Nitrogen Losses: Acidification and Nitrification Inhibitorssupporting

confidence: 89%

“…The variability of the feedstocks, digestate handling, transport, and storage in the local biogas plants and in tanks in the fields before the application could have caused changes in the digestate N content between the initial sampling time and the time of land application. It is well known that open stores (Wang et al, 2014), and the lack of semi-permeable materials to cover the tanks (Börjesson and Berglund, 2007) and protective gas-tight layers (Battini et al, 2014) can lead to large N losses, predominantly via NH 3 volatilization (Petersen and Sørensen, 2008;Fangueiro et al, 2015a), in comparison with the undigested feedstocks. Moreover, the pH of our digestate was 8.24 ± 0.01 at HF and 8.05 ± 0.01 at NW, and according to Muck and Steenhuis (1982), very high losses of NH 3 from digestate occurs above pH 8.0, and small losses below pH 6.0.…”

Section: Digestate and Soil Characteristicsmentioning

confidence: 99%

“…Tiwary et al (2015) reported that 35-65% of the total N applied in digestate can be lost through NH 3 volatilization if the digestate is surface broadcast. Potential methods to reduce NH 3 volatilization include the rapid incorporation of manures and digestates into the soil after application (Möller et al, 2008;Tiwary et al, 2015), soil injection (Riva et al, 2016), bandspreading (Nicholson et al, 2017), and acidification of slurries (Fangueiro et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Advanced Processing of Food Waste Based Digestate for Mitigating Nitrogen Losses in a Winter Wheat Crop

Sánchez‐Rodríguez

Carswell

Shaw

et al. 2018

Front. Sustain. Food Syst.

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The anaerobic digestion of food waste converts waste products into "green" energy. Additionally, the secondary product from this process is a nutrient-rich digestate, which could provide a viable alternative to synthetically-produced fertilizers. However, like fertilizers, digestate applied to agricultural land can be susceptible to both ammonia (NH 3 ) and nitrous oxide (N 2 O) losses, having negative environmental impacts, and reducing the amount of N available for crop uptake. Our main aim was to assess potential methods for mitigating N losses from digestate applied to a winter wheat crop and subsequent impact on yield. Plot experiments were conducted at two UK sites, England (North Wyke-NW) and Wales (Henfaes-HF), to assess NH 3 and N 2 O losses, yield and N offtake following a single band-spread digestate application. Treatments examined were digestate (D), acidified-digestate (AD), digestate with the nitrification inhibitor DMPP (D+NI), AD with DMPP (AD+NI), and a zero-N control (C). Ammonium nitrate (NH 4 NO 3 ) fertilizer N response plots (from 75 to 300 kg N ha −1 ) were included to compare yields with the organic N source. Across both sites, cumulative NH 3 -N losses were 27.6% from D and D+NI plots and 1.5% for AD and AD+NI of the total N applied, a significant reduction of 95% with acidification. Cumulative N 2 O losses varied between 0.13 and 0.35% of the total N applied and were reduced by 50% with the use of DMPP although the differences were not significant. Grain yields for the digestate treatments were 7.52-9.21 and 7.23-9.23 t DM ha −1 at HF and NW, respectively. Yields were greater from the plots receiving acidified-digestate relative to the non-acidified treatments but the differences were not significant. The yields obtained for the digestate treatments ranged between 84.2% (D+NI) and 103.6% (D) of the yields produced by the same N rate from an inorganic source at HF. Advanced processing of digestate reduced N losses providing an environmentally sound option for N management.

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Section: Nitrogen Losses: Acidification and Nitrification Inhibitorssupporting

confidence: 89%

Section: Digestate and Soil Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Advanced Processing of Food Waste Based Digestate for Mitigating Nitrogen Losses in a Winter Wheat Crop

Sánchez‐Rodríguez

Carswell

Shaw

et al. 2018

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

show abstract

“…Slurry acidification decreases NH 3 emissions efficiently as it modifies slurry characteristics (Fangueiro et al, 2015;Hjorth et al, 2015). This treatment is currently performed at the farm scale in Denmark by addition of concentrated sulfuric acid (H 2 SO 4 ).…”

Section: Introductionmentioning

confidence: 99%

“…A recent study reviewed the acidification practices and mentioned the need for alternatives, for the optimization of slurry management (Fangueiro et al, 2015).…”

Section: Introductionmentioning

confidence: 99%