Sustainable reclamation of phosphorus from incinerated sewage sludge ash as value-added struvite by chemical extraction, purification and crystallization

Wang, Qiming; Li, Jiangshan; Tang, Pei; Fang, Le; Poon, Chi Sun

doi:10.1016/j.jclepro.2018.01.254

Cited by 105 publications

(49 citation statements)

References 33 publications

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“…At pH = 3-4, the dissolution of Ca-P compounds is accompanied by the precipitation of Fe-P and Al-P compounds, which hinder the continuous leaching of P [19]. The thermodynamic and kinetic properties as well as the factors that influence sludge leaching [20] have been investigated, which facilitate the recovery of P for use as chemical P fertilizers (Ca-P) [21], struvite [22,23], phosphoric acid [24], etc. by the methods such as precipitation, adsorption, electrodialysis, and so on [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

Zhang

Lü

et al. 2020

Waste Dispos. Sustain. Energy

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Phosphorus (P) is an essential and limited resource. Incineration sewage sludge ash (ISSA) contains a high amount of P, which can be recovered using chemical leaching methods. However, the recovery ratio depends on the speciation of P and the leaching conditions. In this study, hydrochloric acid was used as a leaching agent, and the effects of the hydrochloric acid concentration, leaching time, temperature, and liquid-solid ratio on the P leaching ratio were investigated. Furthermore, the co-leaching of macro-metals Ca, Al, Fe, and Mg was analyzed. The results showed that P leached rapidly within 30 min, where the leaching rate reached more than 80% and then gradually stabilized. The leaching concentrations of Ca and Mg had a significant correlation (correlation coefficient r 2 > 0.90), and both were leached completely. Al and P had similar leaching patterns, where the leaching rates increased initially and then decreased with time at 0.2 mol/L HCl. According to X-ray diffraction analysis and Rietveld refinement, the P in ISSA was mainly present in the forms of Mg 3 Ca 3 (PO 4) 4 and AlPO 4. When leached using 0.2 mol/L HCl at 55 °C with a liquid-to-solid ratio of 20 L/kg, the AlPO 4 and Fe 3 (H 2 O) 3 (PO 4) 2 in ISSA dissolved initially and then precipitated on the surface of the solid phase, thereby impeding further P leaching.

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Section: Introductionmentioning

confidence: 99%

Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

Zhang

Lü

et al. 2020

Waste Dispos. Sustain. Energy

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“…However, negative results were observed based from SEM-EDX and XRF. Reasons for not being able to precipitate struvite could lie from the amount of phosphorus in the wastewater and/or sludge, the presence of contaminants such as iron, calcium, and aluminum which easily bind with phosphate, and the molar ratio of Mg:N:P. For future work, it is recommended to use cation exchange resins [4,5] to eliminate interferences such as iron and aluminum and increase the magnesium and ammonia concentration. In addition, the use of biological nutrient removal technologies (BNRT) could help in increasing phosphorus concentration in sludge.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of reagents such as sodium hydroxide (NaOH) and sulfuric acid (H2SO4) was investigated. Sulfuric acid has been used in previous studies to release phosphorus from sludge [4,5]. The problem with using sulfuric acid is the release of interfering ions such as Fe 3+ and Ca 2+ are also released and could bind and form unwanted precipitates [3].…”

Section: Effect Of Reagent Used For Hydrolysismentioning

confidence: 99%

“…Wang et. al [4] stated that phosphorus could be recovered in the form of hydroxyapatite or struvite, but struvite is preferable since it requires less pretreatment before utilization. Struvite is a crystalline substance with a molecular formula MgNH4PO4•6H2O.…”

Section: Introductionmentioning

confidence: 99%

“…Lastly, it has lower impurity than other phosphate fertilizers [2]. It has been proven that struvite can be precipitated from wastewater and sludge, and it is proven to be an effective fertilizer [4][5][6] . However, in general, struvite recovery or phosphorus recovery has not been explored in the Philippines.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus recovery from wastewater and sludge

et al. 2019

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Wastewater and sludge are potential resource of phosphorus (P) for fertilizer production. One method of recovering phosphorus is via chemical precipitation. In the study, phosphorus was recovered from wastewater and sludge. First, hydrolysis was carried out to release the phosphorus in the sludge by the addition of 1.0M acid (sulfuric acid) or base (sodium hydroxide) solution mixed for three hours at 200 rpm. The hydrolyzed sludge was filtered, and the pH of the solution was adjusted to 9.0. Precipitation for both wastewater and hydrolyzed sludge solution was carried out using magnesium chloride hexahydrate (MgCl2•6H2O) and ammonium chloride (NH4Cl). The mixture was stirred for an hour for crystallization. Precipitates were allowed to settle for 24 hours before it was filtered and dried in an oven at 55-58oC for 24 hours. The dried sample was grinded and characterized using Fourier transform infrared spectroscopy (FTIR), x-ray fluorenscence (XRF), and scanning electron microscope with energy-dispersive x-ray spectroscopy(SEM-EDX).

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Ultrasound assisted bio-acid leaching of sewage sludge ash for phosphorus extraction using lemon juice: optimization and ecological risk assessment

Nazari,

Barani Motlagh,

Rastegar

et al. 2024

Clean Techn Environ Policy

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Sustainable reclamation of phosphorus from incinerated sewage sludge ash as value-added struvite by chemical extraction, purification and crystallization

Cited by 105 publications

References 33 publications

Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

Phosphorus recovery from wastewater and sludge

Ultrasound assisted bio-acid leaching of sewage sludge ash for phosphorus extraction using lemon juice: optimization and ecological risk assessment

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