Acid-Mediated Hydrothermal Treatment of Sewage Sludge for Nutrient Recovery

Sarrión, Andrés; Rubia, M.A. de la; Coronella, Charles J.; Mohedano, A.F.; Díaz, Elena

doi:10.2139/ssrn.4064434

Cited by 2 publications

(2 citation statements)

References 79 publications

(101 reference statements)

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“…Over the range of HCl concentrations investigated, the hydrochar yield decreased gradually from 50.08-35.48%. This was in line with the ndings of Andres et al [31] and Dai et al [16] because acid can increase the solubility of mineral salts and promote the transfer of C to PW [16].…”

Section: Variation Of Hydrochar Yieldsupporting

confidence: 91%

“…At pH < 4.8, phosphate anions exist primarily in their monobasic form (H 2 PO 4 − ), which facilitates the formation of acid phosphates with cations such as Al 3+ , the bonding of which is favored by the increased number of H + [31] . However, very acidic pH levels are not conducive to the formation of phosphates with cations, such as Ca 2+ or Mg 2+ .…”

Section: Transformation Of Phosphorus In Hydrocharmentioning

confidence: 99%

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Migration and conversion of phosphorus in hydrothermal carbonization of municipal sludge with hydrochloric acid

Xue

Wang

Wu³

et al. 2023

Preprint

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Purpose: Phosphate ore is a non-renewable resource, so finding a replacement is necessary. Municipal sludge has significant recycling potential because of its high phosphorus content and large discharge characteristics. Methods: The migration and transformation of phosphorus in sewage sludge treated with different concentrations of HCl were studied using the standards, measurements, and testing phosphorus extraction protocol from two aspects: phosphorus complexation and mineral form. Results: The results showed that more than 95% of phosphorus was concentrated in the solid products (hydrochar) after hydrothermal carbonization (HTC) without HCl, and the main form of phosphorus was organophosphorus (OP). With 0.5% to 2.5% HCl added, the phosphorus concentration of the liquid product (process water, PW) ranged from 13.14 to 219.41 mg/L, and the concentration of ammonia nitrogen (NH4+-N) increased by 0.32- to 1.88-fold. With the addition of 2.5% HCl, the phosphorus content in the hydrochar was 90% that of the original sludge, with a concentration of 64.17 mg/g, and the proportion of non-apatite inorganic phosphorus was approximately 94%. Conclusion: This study provides technical support for the recovery of phosphorus resources from municipal sludge.

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Section: Variation Of Hydrochar Yieldsupporting

confidence: 91%

Section: Transformation Of Phosphorus In Hydrocharmentioning

confidence: 99%