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- W4283328011 abstract "<ns4:p><ns4:bold>Background: </ns4:bold>Hydrothermal carbonization (HTC) of dairy processing waste was performed to investigate the effect of temperature and initial pH on the yield and composition of the solid (hydrochar) and liquor produced. All hydrochars met the EU requirements of organo-mineral solid fertilizers defined in the Fertilizing Products Regulation in terms of phosphorus (P) and mineral content.</ns4:p><ns4:p> <ns4:bold>Methods: </ns4:bold>Laboratory scale HTC was performed using pressurized reactors, and the products (solid and liquid) were collected, stored and analyzed for elemental composition and nutrient content using Inductively coupled plasma optical emission spectroscopy (ICP-OES), ultraviolet-visible spectrophotometry (UV-Vis) and other analytic techniques.</ns4:p><ns4:p> <ns4:bold>Results: </ns4:bold>Maximum hydrochar yield (60.67%) was observed at T=180℃ and pH=2.25, whereas the maximum P-recovery was 80.38% at T=220℃ and pH=4.6. The heavy metal content of the hydrochars was mostly compliant with EU limitations, except for Ni at T=220℃ and pH=8.32. Meanwhile, further study of Chromium (Cr) species is essential to assess the fertilizer quality of the hydrochars. For the liquid product, the increase in temperature beyond 200℃, coupled with an increase in initial acidity (pH=2.25) drove P into the liquor. Simultaneously, increasing HTC temperature and acidity increased the concentration of NO<ns4:sub>3</ns4:sub><ns4:sup>-</ns4:sup> and NH<ns4:sub>4</ns4:sub><ns4:sup>+</ns4:sup> in the liquid products to a maximum of 278 and 148 mg/L, respectively, at T=180℃ and pH=4.6. Furthermore, no direct relation between final pH of liquor and NH<ns4:sub>4</ns4:sub><ns4:sup>+ </ns4:sup>concentration was observed.</ns4:p><ns4:p> <ns4:bold>Conclusions: </ns4:bold>HTC improved the nutrient content of dairy waste, allowing for the production of potential solid organo-mineral fertilizers requiring additional treatment to ensure safe fertilizer application.</ns4:p>" @default.
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- W4283328011 date "2022-06-23" @default.
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- W4283328011 title "Hydrothermal carbonization (HTC) of dairy waste: effect of temperature and initial acidity on the composition and quality of solid and liquid products" @default.
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