Phosphorus distribution and availability in untreated and mechanically separated biogas digestates

Bachmann, Silvia; Uptmoor, Ralf; Eichler‐Löbermann, Bettina

doi:10.1590/0103-9016-2015-0069

Cited by 57 publications

(28 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because K and Na salts are most soluble, they remain in higher concentrations in liquid fractions of digestate and mineral concentrates as compare to AM and DIG. On the other hand, Ca and Mg concentrations decrease with further treatment as they are mostly present in crystalline form with P or adsorbed onto particles (Bachmann et al, 2016). Thus, after mechanical separation, P, Ca and Mg will remain in higher proportions in the solid fraction of separated animal manure or raw digestate.…”

Section: Product Characteristics and Application Ratesmentioning

confidence: 99%

Nitrogen release and mineralization potential of derivatives from nutrient recovery processes as substitutes for fossil fuel‐based nitrogen fertilizers

Sigurnjak

Waele

Michels

et al. 2017

Soil Use and Management

View full text Add to dashboard Cite

The need to meet rapidly increasing demands for synthetic nitrogen (N) while reducing dependence on fossil fuels has been driving widespread attention to the recuperation and reuse of nutrients present in digestate and animal manure. The N release and mineralization potential of animal manure (AM), digestate (DIG), liquid fraction of digestate (LFDIG) and mineral concentrate (MC) were assessed in comparison with N availability from calcium ammonium nitrate (CAN) as a reference. The release was highly dependent on the product NH4+-N/N-total ratio, while mineralization occurred only for products containing more than 5% of organic N. The magnitude of the released N, on average after 120days of an incubation experiment, was in the order: CAN>MC>LFDIG>DIGAM. These results indicate that only the N release from MC exhibited patterns similar to CAN, suggesting that this product will provide plant available N in a similar fashion as synthetic fertilizers. The N release from LFDIG was higher than AM, but did not closely follow the pattern of CAN. The N availability in LFDIG may be increased using substrates richer in N, such as animal manure or waste food and not only plant residues

show abstract

Section: Product Characteristics and Application Ratesmentioning

confidence: 99%

Nitrogen release and mineralization potential of derivatives from nutrient recovery processes as substitutes for fossil fuel‐based nitrogen fertilizers

Sigurnjak

Waele

Michels

et al. 2017

Soil Use and Management

View full text Add to dashboard Cite

show abstract

“…Therefore, it is essential to establish a more sustainable management of the P mass flow, moving toward global use of P that is both sufficient and efficient. In this context, the recovery and recycling of P offers great potential, and several secondary phosphate resources of plant and animal origin have already been shown to be valuable P sources for plant production (Vassilev et al, 2013, Bachmann et al, 2016).…”

mentioning

confidence: 99%

Recycled Products from Municipal Wastewater: Composition and Effects on Phosphorus Mobility in a Sandy Soil

et al. 2017

Self Cite

View full text Add to dashboard Cite

Recycled products from wastewater may contain high concentrations of phosphorus (P) and are thus promising alternative fertilizers. However, to better predict their P fertilizer efficiency and potential for P leaching, investigations on P forms and P mobility in soil are essential. In this study, different recycled products-an untreated sewage sludge ash (SSA), an HSO-digested SSA, four thermochemically treated SSAs (two Mg-SSAs and two Ca-SSAs), and struvite-were investigated using a combination of wet chemical methods and P K-edge X-ray absorption near-edge structure (XANES) spectroscopy concerning their composition and their effects on P sorption in a sandy soil in comparison to triple superphosphate. Most of the P in the SSAs was associated with Ca in stable P fractions. The lowest P values in labile fractions (HO-P, NaHCO-P) were found for the untreated SSA and struvite. However, the addition of struvite resulted in an immediate increase in the bioavailable P fractions and the degree of P saturation in soil after only 1 d of incubation. This suggests a high P fertilizer potential for struvite but also a risk of P losses. Among the SSAs, the two Mg-SSAs increased the bioavailable P fractions in soil the most, whereas the lowest values were measured after application of the untreated SSA. Our results demonstrate that chemical analyses of recycled P products may involve the risk of misjudging the fertilizer quality when performed alone, without considering the behavior of these products in soil.

show abstract

“…It should be pointed out that the determination of the various P fractions in the liquid biogas digestate has not yet been done. The available analytical data are derived from dry mass (Li et al, 2014; Bachmann et al, 2016) and cannot be transferred to the liquid digestate.…”

Section: Resultsmentioning

confidence: 99%

Biogas Digestate Application Modifies Solute Transport Conditions in Soils and Increases the Release of Phosphorus

Koch

Kahle

Lennartz

2019

Vadose Zone Journal

View full text Add to dashboard Cite

Core Ideas Severe rainfall events cause increased phosphorus release from soils. The proportion of DRP increases with increasing rainfall duration. Digestate application causes a 400‐fold increase in pore water P concentrations. The DRP fraction is clearly dominant immediately after fertilization. Digestate application facilitates a flux regime shift with preferential flow pathways. The application of fertilizers to soils may impair the quality of both surface and subsurface waters. Severe rainfall events that follow fertilizer application can increase P release from soils. In this study, suction plates were installed in a loamy soil with the aim of determining the P transport patterns and processes in the soil before and after the application of biogas digestate. Prior to the application of biogas digestate, the pore water concentrations of dissolved reactive P (DRP) were significantly lower than the total P (TP) concentrations, with DRP/TP ratios increasing from 0.03 to 0.89. After fertilizer application, the TP and DRP pore water concentrations increased 400‐fold. The DRP/TP ratio remained almost constant at 0.83. After 220 mm of precipitation, 4.5% of the P mass applied was leached to below the 50‐cm soil depth, indicating the general mobility of P in soils during high‐intensity rainfall. Brilliant Blue dye tracing experiments revealed that organic‐matter‐rich biogas digestate obviously changes the flow and transport patterns in soils from being homogenous to moderately heterogeneous, including preferential flow. Although the P loading across the flux plane had been equilibrated prior to treatment, after the application it was found to be concentrated in preferred transport regions. The emerging conclusion is that the risk of ground and subsequent surface water pollution with P after fertilization with biogas digestate originates not only from the applied P mass but also from the shift in the flow and transport regime caused by the organic‐matter‐rich slurry.

show abstract

Phosphorus distribution and availability in untreated and mechanically separated biogas digestates

Cited by 57 publications

References 41 publications

Nitrogen release and mineralization potential of derivatives from nutrient recovery processes as substitutes for fossil fuel‐based nitrogen fertilizers

Nitrogen release and mineralization potential of derivatives from nutrient recovery processes as substitutes for fossil fuel‐based nitrogen fertilizers

Recycled Products from Municipal Wastewater: Composition and Effects on Phosphorus Mobility in a Sandy Soil

Biogas Digestate Application Modifies Solute Transport Conditions in Soils and Increases the Release of Phosphorus

Contact Info

Product

Resources

About