Phosphorus recovery and reuse by pyrolysis: Applications for agriculture and environment

Sun, Daquan; Hale, Lauren; Kar, Gourango; Soolanayakanahally, Raju; Adl, Sina M.

doi:10.1016/j.chemosphere.2017.12.035

Cited by 114 publications

(47 citation statements)

References 83 publications

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“…This indicates that P in our rice husk biochar is initially released when extracted close to the native biochar pH (?9.5 in the first extraction step) and continues to be released until at least 40% of the total P is extracted with potential further P release. These results suggest that rice husk biochar is a suitable P fertilizer, which is confirmed in other studies (e.g., Sun et al, 2018).…”

Section: Effect Of Ph On Biochar Phosphorus Releasesupporting

confidence: 90%

“…A factor not sufficiently quantified for biochar‐containing soil systems is the influence of pH and elemental composition of the soil solution, particularly Ca for its importance in modifying P availability (Blume et al, 2016; Sun et al, 2018). The relevance of pH in explaining the effects of biochar addition to soil are evident from meta‐analysis (Biederman and Harpole, 2013), but the local effects at the interface of biochar and soil require examination.…”

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confidence: 99%

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Biochar Phosphorus Release Is Limited by High pH and Excess Calcium

et al. 2018

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Aside from its use for improving soil properties, biochar is increasingly promoted as a direct nutrient provider for sustainable recycling of waste materials. However, incomplete understanding of the interacting factors that determine P release from biochar may limit the efficiency of P recycling from biochar to soil. In particular, the contrasting pH of biochar and soil need to be considered. In this study, soil‐free biochar (rice [Oryza sativa L.] husk, 700°C) extractions were performed under different pH (4.6–9.9) and extractant conditions to test how solution composition affects biochar P release. When solution pH was in the range of 7.6 to 8.6 and excess Ca was present in the solution or in biochar, P release was low—only 1 to 7% of the total P was released compared with ∼20% under most other conditions. Importantly, we demonstrate that biochar total Ca concentration is closely related to P availability (R2 = 0.76) and could be used to predict biochar P release. The results suggest that for maximum P release, low Ca concentrations in biochar and (soil) solution are needed and/or a pH <7.5 at the soil‐biochar interface. This novel understanding will help engineer sustainable biochar fertilizers optimized for P provision. Core Ideas Phosphorus release from rice husk biochar was investigated. Soil‐free extractions were performed at different pH and solution compositions. The lowest P release occurred at pH 7.6 to 8.6 and in the presence of excess Ca. A conceptual model was developed of biochar P release in different soil conditions. Biochars with Ca <1% and/or pH <7.5 are optimal for maximum P release to soil.

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Section: Effect Of Ph On Biochar Phosphorus Releasesupporting

confidence: 90%

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confidence: 99%

Biochar Phosphorus Release Is Limited by High pH and Excess Calcium

et al. 2018

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“…Organic manures have been shown to supply required plant nutrients, improve soil structure and promote plant growth (Agbede et al, 2014(Agbede et al, , 2017. The addition of organic manure in soil may encourage the immobilization of bioavailable nitrogen and phosphorus, which may otherwise be lost through leaching or emissions in the environment (Sun et al, 2018).…”

Section: Survival and Growth Of Cacao Seed-lings As Affected By Fertimentioning

confidence: 99%

Fertilizer application enhances establishment of cacao seedlings in plant-parasitic nematodes infected soil

Orisajo

Adejobi

2020

AAS

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Low soil fertility, pests and diseases are major problems of growth and establishment of cacao seedlings on the field. Cocoa production increases by new plantings and rehabilitation of moribund farms, but a build-up of plant-parasitic nematodes (PPN) causing dieback and declining soil fertility has discouraged many farmers, leading to a reduction in crop productivity. In this study, the potentials of some organic wastes as fertilizers and their effects on establishment of cacao seedlings in PPN infected soils was investigated at Ibadan and Owena of Southwestern Nigeria. Goat dung (GD), organic fertilizer (OF), organo-mineral fertilizers (OMF) and NPK 15:15:15 were applied at 200, 400 and 600 kg ha-1, respectively, to cacao seedlings one month after transplanting, while unfertilized served as control. Results from the experiments showed a significant increase in percentage survival of cacao seedlings under organic fertilizers at Ibadan and Owena compared to NPK and control even at the lowest rate of 200 kg ha-1 3 years after transplanting. The incorporation of GD, OF and OMF significantly reduced the population densities of PPN compared to control. Therefore, GD, OF and OMF at 200 kg ha-1 are recommended for soil application to enhance the field establishment of cacao seedlings in the soil infected with PPN.

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“…It is a crucial component added in fertilisers for food production and has no substitute; therefore, recovering phosphate from wastewaters is imperative [15][16][17]. Concentrations of phosphate in surface waters even in the tiny range of 0.01 to 0.1 mg L −1 P can lead to its eutrophication, which poses a substantial risk to the ecosystem resulting in environmental as well economic damage [15,17]. The presence of phosphate in natural waters comes from diffuse sources such as agricultural run-offs and municipal wastewater treatment plants [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Concentrations of phosphate in surface waters even in the tiny range of 0.01 to 0.1 mg L −1 P can lead to its eutrophication, which poses a substantial risk to the ecosystem resulting in environmental as well economic damage [15,17]. The presence of phosphate in natural waters comes from diffuse sources such as agricultural run-offs and municipal wastewater treatment plants [15,16]. Hence there is a need for technology that can effectively reduce the phosphorus to concentrations in the sub microgram levels.…”

Section: Introductionmentioning

confidence: 99%

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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Phosphorus recovery and reuse by pyrolysis: Applications for agriculture and environment

Cited by 114 publications

References 83 publications

Biochar Phosphorus Release Is Limited by High pH and Excess Calcium

Biochar Phosphorus Release Is Limited by High pH and Excess Calcium

Fertilizer application enhances establishment of cacao seedlings in plant-parasitic nematodes infected soil

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

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