Influence of microwave-assisted pyrolysis parameters and additives on phosphorus speciation and transformation in phosphorus-enriched biochar derived from municipal sewage sludge

Fang, Zhenquan; Liu, Feifei; Li, Yanlong; Li, Bingshuo; Yang, Tianhua; Li, Rundong

doi:10.1016/j.jclepro.2020.125550

Cited by 45 publications

(5 citation statements)

References 32 publications

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“…Phosphorus (P) is an important plant nutrient, which is also a non-renewable resource (Fang et al 2021). In agricultural production, it is necessary to supplement a large amount of P fertiliser for crop growth (Xie et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…It was confirmed that P emissions from livestock farming accounted for 56% of total P emissions from agricultural sources in China (Fan et al 2020a, b). However, according to the US Geological Survey, the static utilisation period of China's P reserves is only 37 years (Fang et al 2021). Therefore, recovery of P from P-rich water bodies, including bio-liquid wastewater, is an important initiative for alleviating the P resource crisis.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Fang

Ali

Gao

et al. 2022

Biochar

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Conversion of organic waste into engineered metal-biochar composite is an effective way of enhancing biochar’s efficiency for adsorptive capture of phosphorus (P) from aqueous media. Thus, various strategies have been created for the production of metal-biochar composites; however, the complex preparation steps, high-cost metal salt reagent application, or extreme process equipment requirements involved in those strategies limited the large-scale production of metal-biochar composites. In this study, a novel biochar composite rich in magnesium oxides (MFBC) was directly produced through co-pyrolysis of magnesite with food waste; the product, MFBC was used to adsorptively capture P from solution and bio-liquid wastewater. The results showed that compared to the pristine food waste biochar, MFBC was a uniformly hybrid MgO biochar composite with a P capture capacity of 523.91 mg/g. The capture of P by MFBC was fitted using the Langmuir and pseudo-first-order kinetic models. The P adsorptive capture was controlled by MgHPO4 formation and electrostatic attraction, which was affected by the coexisting F− and CO32− ions. MFBC could recover more than 98% of P from the solution and bio-liquid wastewater. Although the P-adsorbed MFBC showed very limited reusability but it can be substituted for phosphate fertiliser in agricultural practices. This study provided an innovative technology for preparing MgO-biochar composite against P recovery from aqueous media, and also highlighted high-value-added approaches for resource utilization of bio-liquid wastewater and food waste. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Fang

Ali

Gao

et al. 2022

Biochar

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“…Sewage sludge (SS) generally has great potential for land application because of its enrichment of phosphorus (P), sulfur (S) and other nutrient elements induced by human activities. − Specifically, P and S can amount to 2 and 1% (dry weight) in their contents in SS, respectively, , which, as reusable resources, are expected to tackle the current dilemma of limited P fertilizers , and the problem of S deficiency in arable soil. , On the other hand, land application of SS is frequently discouraged and only 29.3% of SS is disposed via land application in China due to the presence of toxic metals, organic contaminants and pathogenic bacteria. ,− Therefore, increasingly released SS presents big challenges and opportunities for environmental safety and resource recycling in China. Converting SS into biochar via pyrolysis is proposed as a promising disposal alternative for recycling the organic waste because pyrolysis can greatly decrease the environmental risks of SS by immobilizing heavy metals and decomposing pathogens and organic contaminants. − Recently, increasing global interest in SS biochar (SSB) ,− raises a great desire for understanding the speciation of P and S in the biochar and their transformation and fate in soil.…”

Section: Introductionmentioning

confidence: 99%

Speciation Evolution of Phosphorus and Sulfur Derived from Sewage Sludge Biochar in Soil: Ageing Effects

Sun

Luo

Wang

et al. 2022

Environ. Sci. Technol.

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Phosphorus (P) and sulfur (S) are usually involved simultaneously in the immobilization of heavy metals in sewage sludge during pyrolysis, and thus their speciation in sewage sludge-derived biochar (SSB) profoundly affects the recycling of the nutrients and the environmental risks of sewage sludge. Here, we investigated the speciation evolution of P and S in SSB induced by ageing processes in soil using X-ray absorption near edge structure spectroscopy. Results showed that Ca-bound compounds like hydroxyapatite dominated the P forms, while over 60% of S existed as reduced inorganic sulfides in the SSB. The stable Ca-associated P species in SSB tended to be transformed gradually into relatively soluble species during ageing in soil. The speciation composition of S in SSB remained almost unaffected when aged in pot soils, whereas about 33.6% of reduced sulfides were transformed into oxidized species after 1-year ageing in field soils. SSB significantly increased the proportion of sulfides and the contents of available P and S in the amended soil but showed relatively weak effects on the speciation distribution of P in the soil because of their similar compositions. These findings provide insights into biogeochemistry of nutrients and behaviors of heavy metals in SSB after its application to the soil environments.

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“…Higher energy input intensity also facilitates the conversion of most of the organic phosphorus (OP) in the sludge into inorganic phosphorus (IP). Non-apatite inorganic phosphorus (NAIP) is transformed into apatite inorganic phosphorus (AIP) with lower bioavailability [20,53]. A large number of studies in the literature have applied microwave to the preparation of biochar from sludge, which is due to the fact that water in sludge is a polar molecule that enhances the microwave absorption capacity, while many types of biomass are not sensitive to microwave radiation [54].…”

Section: Conventional Pyrolysismentioning

confidence: 99%

A Review on the Removal of Heavy Metals from Water by Phosphorus-Enriched Biochar

Zeng,

Lin,

et al. 2024

Minerals

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In recent years, the utilization of phosphorus-enriched biochar (PBC) has attracted significant attention due to its exceptional stability and surface reactivity. This review systematically summarizes the advancements in research related to the application of PBC as an adsorbent for remediating water contaminated with heavy metals. Initially, the precursors utilized in the production of PBC, encompassing biomass and phosphorus sources, are introduced. Subsequently, the distinct physicochemical properties and adsorption characteristics resulting from phosphorus doping on the biochar surface through various carbonization processes and parameters are elucidated. Additionally, the diverse adsorption mechanisms employed by PBC in removing heavy metals from water are analyzed. Lastly, future research prospects and associated challenges concerning PBC are presented. This paper aims to furnish comprehensive background information for the practical implementation of PBC in the purification of heavy metal-contaminated water environments.

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Influence of microwave-assisted pyrolysis parameters and additives on phosphorus speciation and transformation in phosphorus-enriched biochar derived from municipal sewage sludge

Cited by 45 publications

References 32 publications

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Speciation Evolution of Phosphorus and Sulfur Derived from Sewage Sludge Biochar in Soil: Ageing Effects

A Review on the Removal of Heavy Metals from Water by Phosphorus-Enriched Biochar

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