Phosphorus recovery as K-struvite from a waste stream: A review of influencing factors, advantages, disadvantages and challenges

Yesigat, Asamin; Abebe, Worku; Mekonnen, Addisu; Bae, Wookeun; Feyisa, Gudina Legese; Gatew, Shetie; Han, Jinglong; Liu, Wenzong; Wang, Aijie; Guadie, Awoke

doi:10.1016/j.envres.2022.114086

Cited by 22 publications

(6 citation statements)

References 141 publications

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“…The selection of the most suitable technology is difficult, due to insufficient experts. The phosphate precipitation process must be performed precisely in the precipitation area-struvite scale on pipes being a hazard associated with the precipitation technology scale-up [468]. Economic challenges are still significant, due to the phosphates market volatility, and phosphorus recovery subsidies are necessary to promote the technology adoption [469].…”

Section: Critical Evaluation Of the Methods Used To Recover Mineral N...mentioning

confidence: 99%

“…Economic challenges are still significant, due to the phosphates market volatility, and phosphorus recovery subsidies are necessary to promote the technology adoption [469]. Although the existing regulatory framework insisted on contaminant control of the fertilizing product with recovered phosphorus, safety challenges translate into an end-user acceptance barrier [468]. Logistic challenges are also significant, due to the diffuse location of anaerobic digesters.…”

Section: Critical Evaluation Of the Methods Used To Recover Mineral N...mentioning

confidence: 99%

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Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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The recovery of plant mineral nutrients from the bio-based value chains is essential for a sustainable, circular bioeconomy, wherein resources are (re)used sustainably. The widest used approach is to recover plant nutrients on the last stage of biomass utilization processes—e.g., from ash, wastewater, or anaerobic digestate. The best approach is to recover mineral nutrients from the initial stages of biomass biorefinery, especially during biomass pre-treatments. Our paper aims to evaluate the nutrient recovery solutions from a trans-sectorial perspective, including biomass processing and the agricultural use of recovered nutrients. Several solutions integrated with the biomass pre-treatment stage, such as leaching/bioleaching, recovery from pre-treatment neoteric solvents, ionic liquids (ILs), and deep eutectic solvents (DESs) or integrated with hydrothermal treatments are discussed. Reducing mineral contents on silicon, phosphorus, and nitrogen biomass before the core biorefinery processes improves processability and yield and reduces corrosion and fouling effects. The recovered minerals are used as bio-based fertilizers or as silica-based plant biostimulants, with economic and environmental benefits.

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Section: Critical Evaluation Of the Methods Used To Recover Mineral N...mentioning

confidence: 99%

Section: Critical Evaluation Of the Methods Used To Recover Mineral N...mentioning

confidence: 99%

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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“…Moreover, there is a severe imbalance in the global distribution of phosphate rock resources, with many countries having little to no reserves (Zhu et al, 2023). It is estimated that the world's phosphorus resources will be depleted within the next 50 years (Yesigat et al, 2022). Therefore, we face a dual challenge: not only must we address the “phosphorus crisis” of dwindling resources but we must also tackle the issue of “phosphorus pollution.” Excessive discharge of phosphorus leads to serious environmental problems (Crossley et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Study on the removal efficacy and mechanism of phosphorus from wastewater by eggshell‐modified biochar

Xu,

Li,

Sumita

et al. 2024

Water Environment Research

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The excessive discharge of phosphorus from rural domestic sewage is a problem that worthy of attention. If the phosphorus in the sewage were recovered, addressing this issue could significantly contribute to mitigating the global phosphorus crisis. In this study, corn straw, a common agricultural waste, was co‐pyrolytically modified with eggshells, a type of food waste from university cafeterias. The resulting product, referred to as corn straw eggshell biochar (EGBC) was characterized using SEM, XRD, XPS, XRF, and other methods. Batch adsorption experiments were conducted to determine the optimal preparation conditions of EGBC and to explore its adsorption characteristics. EGBC showed strong adsorption effectiveness within a pH range of 5–12. The adsorption isotherm closely followed the Sips model (R2 > 0.9011), and the adsorption kinetics were more consistent with the pseudo‐second‐order model (R2 > 0.9899). The process was found to be both spontaneous and endothermic. Under optimal conditions, the phosphorus adsorption capacity of EGBC was measured to be 288.83 mg/g. This demonstrates the high efficiency of EGBC for phosphorus removal and illustrates an effective method of utilizing food waste for environmental remediation.Practitioner Points Biochar prepared from waste eggshell was used to removal and recovery phosphorus in wastewater treatment. EGBC has an impressive adsorption capacity that can reach up to 288.83 mg/g. EGBC has excellent adsorption and filtration capabilities, and there is a sudden increase in concentration at 900 min in the breakthrough curve of EGBC. EGBC has good regeneration performance, with an adsorption effect of 65% and an adsorption capacity of 121 mg/g after four desorption and regeneration cycles.

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“…In recent years, practicability [ 13 , 14 , 15 , 16 ], new retarders [ 17 , 18 ], durability [ 19 , 20 ] and effects of new admixtures [ 18 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] were focuses of research on MKPC. However, the hydration mechanism of MKPC has always been one of the key issues.…”

Section: Introductionmentioning

confidence: 99%

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

Leng,

Fu,

et al. 2024

Materials

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Magnesium potassium phosphate cement (MKPC) is formed on the basis of acid–base reaction between dead burnt MgO and KH2PO4 in aqueous solution with K-struvite as the main cementitious phase. Due to the unique characteristics of these cements, they are suitable for special applications, especially the immobilization of radioactive metal cations and road repair projects at low temperature. However, there are few articles about the hydration mechanism of MKPC. In this study, the types, proportions and formation mechanism of MKPC crystalline phases under different magnesium to phosphorus (Mg/P) ratios were studied by means of AAS, ICP-OES, SEM, EDS and XRD refinement methods. Corresponding MD simulation works were used to explain the hydration mechanism. This study highlights the fact that crystalline phases distribution of MKPC could be adjusted and controlled by different Mg/P ratios for the design of the MKPC, and the key factor is the kinetic of K+.

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Phosphorus recovery as K-struvite from a waste stream: A review of influencing factors, advantages, disadvantages and challenges

Cited by 22 publications

References 141 publications

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Study on the removal efficacy and mechanism of phosphorus from wastewater by eggshell‐modified biochar

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

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