Acidification and alkalinization pretreatments of biowastes and their effect on P solubility and dynamics when placed in soil
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the use of biowastes as fertilizers. For this reason, we investigated how different pretreatments affect the P
dynamics when biofertilizers are placed in the soil.
Methods: Sewage sludge (SS), sewage sludge ash (SS-ash), meat and bone meal (MBM), and the solid fraction of
biogas digestate (BGF) were pretreated with H2SO4, NaOH, and Ca(OH)2 and incubated for 2 and 12 days,
respectively, in a one-dimensional reaction system for detailed studies of the interactions in the biomaterial-soil
interface and the soil adjacent to the placement zone.
Results: Our results showed that acidification and treatment with NaOH increased the P solubility of the biomaterials.
The P loss from the biomaterial layer to the soil was correlated with water-extractable P in the biomaterials
(0.659) and water-extractable P in the soil (0.809). Acidification significantly increased the total
amount of P depleted from the biomaterial to the soil whereas NaOH pre-treatment did not. However, for NaOHtreated
SS and SS-ash, the apparent recoveries were significantly higher compared to the acidification due to a
decrease in soil P sorption capacity as the soil pH increased due to residual alkalinity in the biomaterials.
Conclusions: Acidification showed promising results by increasing the P solubility of all the biomaterials, and the
alkalinization of SS and SS-ash with NaOH by increasing the apparent recovery in the soil. However, further
studies are needed to assess the effects of these treatments on plant growth and P uptake.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 117447 |
Tidsskrift | Journal of Environmental Management |
Vol/bind | 333 |
Antal sider | 14 |
ISSN | 0301-4797 |
DOI | |
Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 860127 ″
Funding Information:
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Pietro Sica reports financial support was provided by European Commission Marie Sklodowska-Curie Actions.This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No.860127″
Publisher Copyright:
© 2023 The Author(s)
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