Evaluation of hydrothermal carbonization in urban mining for the recovery of phosphorus from the organic fraction of municipal solid waste

Oliver-Tomas, Borja; Hitzl, Martin; Owsianiak, Mikołaj; Renz, Michael

doi:10.1016/j.resconrec.2019.04.023

Cited by 42 publications

(24 citation statements)

References 40 publications

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“…According to previous results (data not shown), these operating ranges and the literature data on P extraction from solid organic waste were selected. 17,21,[33][34][35][36] In this study, the constant operating parameters were: S:L ratio 10% w/v, agitation speed of 200 rpm, and operation time of 8 h. These values were selected from previous studies and have not been optimized. 21,37,38 Temperature effect on the P extraction First, the temperature effect on the S:L extraction was analyzed.…”

Section: Raw Materials Compositionmentioning

confidence: 99%

“…The possible reason for the decrease in P concentration could be that, at high temperatures, dissolved P can precipitate with cations of Ca, Mg, and Fe. 22,41 Oliver-Tomas et al 34 studied P extraction from the organic fraction of municipal solid waste. This study analyzed the temperature effect on P extraction using such inorganic acids as sulfuric, nitric, and hydrochloric acid.…”

Section: Raw Materials Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Phosphorus recovery from organic waste for its agronomic valorization: technical and economic evaluation

Fernández‐Delgado

Amo-Mateos

Cubero

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The present work investigates the use of municipal mixed waste compost (MMWC) residue for phosphorus (P) recycling from a technical, economic, and environmental perspective. The study aims to obtain liquid extracts rich in P from MMWC with a low heavy metals content, suitable for their subsequent precipitation in the struvite form. The effect of inorganic (sulfuric/nitric) and organic (oxalic/citric) acids at different molarities and temperatures was studied using technical analysis. The preliminary economic analysis allows the costs of the extraction section for the optimal extraction strategies to be estimated and compared.RESULTS: Based on the multilevel factorial design, the P extraction optimization shows that sulfuric acid 0.5 M and 30 °C provided the highest P extraction yield, 94.2%. However, oxalic acid 0.1 M and 30 °C is the best choice to maximize the P extraction yield, while also minimizing the heavy metals concentration, reaching a P recovery of 2.5 g P/kg. The extraction kinetics for all tested acids were satisfactorily modelled using a second-order model (r 2 > 0.99). The preliminary economic analysis, estimated for a P extraction pilot plant of 100 kg h −1 of MMWC, noted that sulfuric acid 0.5 M provided the lowest total investment cost (130 000 €) and a minimum sale price of theoretical struvite at 4.96 €/kg. CONCLUSION: MMWC is a promising raw material for P recycling as fertilizer due to an appreciable P concentration (7 g P/kg), which can be used together with other residues rich in P to obtain an economical and sustainable extraction process.

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Section: Raw Materials Compositionmentioning

confidence: 99%

Section: Raw Materials Compositionmentioning

confidence: 99%

Phosphorus recovery from organic waste for its agronomic valorization: technical and economic evaluation

Fernández‐Delgado

Amo-Mateos

Cubero

et al. 2021

J of Chemical Tech & Biotech

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show abstract

“…Significantly, the content of Acid-ON in hydrochar decreased from 6.18 ± 0.09 mg/g at 240 °C to 0.01 mg/g at 280 °C. This might be because the polymerization of pyrrole-N was improved at high reaction temperatures, resulting in the conversion of pyrrole-N into more stable heterocyclic nitrogen forms such as pyridines-N and quaternary-N, which could not be possibly extracted by hydrochloric acid [ 60 , 61 ].…”

Section: Resultsmentioning

confidence: 99%

Speciation of Main Nutrients (N/P/K) in Hydrochars Produced from the Hydrothermal Carbonization of Swine Manure under Different Reaction Temperatures

et al. 2021

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Hydrothermal carbonization (HTC) has been proved to be a promising technology for swine manure (SM) treatment. Currently, there is a lack of systematic understanding of the transformation characteristics of nutrient speciation in the HTC of SM. In this study, the speciation of the main nutrients (N/P/K) in SM-derived hydrochar produced at different reaction temperatures (200–280 °C) was investigated. The recovery of P (61.0–67.1%) in hydrochars was significantly higher than that of N (23.0–39.8%) and K (25.5–30.0%), and the increase in reaction temperature promoted the recovery of P and reduced the recovery of N. After the HTC treatment, the percentage of soluble/available P was reduced from 61.6% in raw SM to 4.0–23.9% in hydrochars, while that of moderately labile/slow-release P was improved from 29.2% in raw SM feedstock to 65.5–82.7%. An obvious reduction was also found in the amounts of available N (from 51.3% in raw SM feedstock to 33.0–40.5% in hydrochars). The percentages of slow-release N and residual N in hydrochars produced at 240 °C reached the maximum and minimum values (46.4% and 18.9%), respectively. A total of 49.5–58.3% of K retained in hydrochars was residual (invalid) potassium. From the perspective of the mobility and availability of N, P and K only, it was suggested that the HTC of SM should be carried out at 220–240 °C. Compared with the original SM, it is safer and more effective to use the SM-derived hydrochar as an organic fertilizer.

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“…The so prepared char-water solution was acidified using two different acid reagents: HNO3, and H2SO4, for 3 hours, at room temperature, in stirred glass vessels. The reagents concentration was established starting from previous experiences [6,7,8] therefore, two different concentrations have been tested for both reagents: 50%, and 60% w/w of processed SLBpy. After leaching, charliquid solution was separated using a buchner funnel with no-ash cellulosic paper filters, installed over a suction glass bottle with a vacuum pump.…”

Section: Methodsmentioning

confidence: 99%

Integration of two-stage thermochemical treatment and chemical leaching for extraction of advanced biochar and high value critical raw materials from sewage sludge

Salimbeni¹,

Rizzo²,

Chiaramonti

2021

E3S Web Conf.

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The proposed study aims at assessing the reliability of a new sludge conversion technology, based on integrating thermochemical treatment, with a chemical leaching stage for producing high quality biochar and valuable liquid with high concentration of phosphorus and other critical elements. The concept is based on the fact that sludge ash usually contains about 25% of CaO, 20% of P2O5, and about 25-30% of SiO2. With the removal of these elements, ash content is drastically reduced. The study is thus composed of two phases: (1) assessment of sludge thermochemical conversion routes, and (2) chemical leaching produced biochar. In the first phase, three thermochemical routes are investigated: HTC of fresh sludge at 80% moisture, slow pyrolysis of dry sludge, slow pyrolysis of HTC solid (hydrochar). In the second phase, the solid obtained by slow pyrolysis (biochar) is upgraded through leaching treatment to extract inorganic valuable elements: P, Mg, K. The first phase of the study demonstrated that processing dry sludge in slow pyrolysis at 450°C allows to obtain a low volatile carbonaceous product with characteristics similar to a thermal coal. Second phase demonstrated that, after acid leaching process using HNO3, ash content in biochar decreased from 41.63% to 16.67%. This method also demonstrated to be a valid solution to extract more than 90% of P, K, and Mg contained in the solid, making these elements available for being recycled in agriculture and other industrial uses. At the same time, the increase of the biochar C content and calorific value makes it a valid substitute of fossil coals.

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Evaluation of hydrothermal carbonization in urban mining for the recovery of phosphorus from the organic fraction of municipal solid waste

Cited by 42 publications

References 40 publications

Phosphorus recovery from organic waste for its agronomic valorization: technical and economic evaluation

Phosphorus recovery from organic waste for its agronomic valorization: technical and economic evaluation

Speciation of Main Nutrients (N/P/K) in Hydrochars Produced from the Hydrothermal Carbonization of Swine Manure under Different Reaction Temperatures

Integration of two-stage thermochemical treatment and chemical leaching for extraction of advanced biochar and high value critical raw materials from sewage sludge

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