Alkaline recovery of phosphorous from sewage sludge and stabilisation of sewage sludge residue

Falayi, Thabo

doi:10.1016/j.wasman.2018.11.041

Cited by 27 publications

(11 citation statements)

References 22 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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“…These results indicate that for both adsorbents, there are a significant number of adsorption sites available to be filled which results in the speedy adsorption process, due to the high driving force in the mass transfer [28,39,40]. The adsorption rate of P onto CSW and CSW-T are fast, probably resulting from the significant presence of many functional groups and oxides that are effectively involved in the phosphate capture [28,[38][39][40].…”

Section: Kinetic Study Of the Adsorptionmentioning

confidence: 91%

“…Crop production is estimated to enhance of around 1.8% until the year 2050 what, inevitably, will lead in high demand for P-based fertilisers [40]. It is well-known that the world reserves of phosphate are dwindling [45]; therefore, it is imperative to search for new alternative sources of P aiming agricultural purposes.…”

Section: Phosphate Adsorbed On Concrete Sludge Waste (Csw-p) As Potenmentioning

confidence: 99%

“…It is well-known that the world reserves of phosphate are dwindling [45]; therefore, it is imperative to search for new alternative sources of P aiming agricultural purposes. Mostly of P comes from phosphate rocks, and more than 80% of available phosphate rock contains deficient levels of P [40]. Therefore, land disposal may be a good option for the final destination of several solid residues, including alkaline CSWs.…”

Section: Phosphate Adsorbed On Concrete Sludge Waste (Csw-p) As Potenmentioning

confidence: 99%

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Adsorption and recovery of phosphate from aqueous solution by the construction and demolition wastes sludge and its potential use as phosphate-based fertiliser

Reis

Cazacliu²,

Correa

et al. 2020

Journal of Environmental Chemical Engineering

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This study aimed to investigate phosphate removal from aqueous effluents by an inorganic sludge from the inert part of construction and demolition wastes (CSW) as adsorbent. It is also discussed the application of the loaded P adsorbent as potential fertiliser. The CSW was also thermally treated at 800°C for 2 h (CSW-T), and its influence in the P removal was also investigated. The characterisation techniques highlighted low porosity on CSW and CSW-T adsorbents and that they are mainly formed by oxides which could enhance the P uptake and recovery. In pH experiments, P adsorption increased as initial pH increased, at pH higher than 7.8 the P removal sharply increased due to the formation of calcium phosphate precipitate. The mechanism of the P adsorption onto CSW indicated that the process was mainly controlled by chemical bonding or chemisorption. The results showed that CSW-T was more effective for P removal in comparison to CSW based on the Liu isotherm, the maximum sorption capacity attained was 24.04 (CSW) and 57.64 mg g −1 (CSW-T). Based on the Avrami's kinetic models, the time for attaining 95% of saturation was 212.6 (CSW), and 136.6 min (CSW-T). CSW and CSW-T showed the highest phosphate-removal performance among many adsorbents found in the literature; therefore, this kind of waste can be used widely as an inexpensive phosphate-recovery adsorbent. Besides, the P loaded adsorbents could be used as potential fertilisers which could be an interesting and efficient way of reuse for this waste.

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“…According to statistics, the phosphate mine may be exhausted after 50 years, and the risk of global food production is increased (Wu et al, 2019). The ow of phosphorus from the phosphate rock to the water environment is also a one-way process, which will undoubtedly lead to the loss of phosphorus and the eutrophication of the water (Falayi, 2019;Jia et al, 2020). Therefore, it is urgent to seek an e cient and reliable method of phosphorus recovery.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus recovery from waste activated sludge by sponge iron seeded crystallization of vivianite and process optimization with response surface methodology

Zeng

et al. 2021

Environ Sci Pollut Res

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As a novel phosphorus recovery product, vivianite (Fe 3 (PO ) 2 •8H 2 O) has attracted much attention due to its enormous recycling potential and foreseeable economic value. Taking sponge iron as seed material, the effect of different reaction conditions on the recovery of phosphorus in waste activated sludge by vivianite crystallization was studied. Through single factor test, the optimal conditions for vivianite formation were in the pH range of 5.5-6.0 with Fe/P molar ratio of 1.5. Scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) were used to analyze the components of the crystals. The results showed that the vivianite produced with sponge iron as the seed crystal were larger and thicker (300-700 μm) than other seed (200-300 μm) and without seed (50-100 μm). Moreover, vivianite, which was synthesized with sponge iron as seed, was obviously magnetic and could be separated from sludge by rubidium magnet. The Box-Behnken design of the response surface methodology was used to optimize the phosphorus-recovery process with sponge iron (maximum phosphorus recovery rate was 83.17%), and the interaction effect of parameters was also examined. PH had a signi cant effect on the formation of vivianite. In summary, this research veri es the feasibility of using sponge iron as seed crystal to recover phosphorus in the form of vivianite from waste activated sludge, which is conducive to the subsequent separation and utilization of vivianite.

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Alkaline recovery of phosphorous from sewage sludge and stabilisation of sewage sludge residue

Cited by 27 publications

References 22 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

Adsorption and recovery of phosphate from aqueous solution by the construction and demolition wastes sludge and its potential use as phosphate-based fertiliser

Phosphorus recovery from waste activated sludge by sponge iron seeded crystallization of vivianite and process optimization with response surface methodology

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