Mobility and bio-accessibility of available phosphorus in sewage sludge: Influencing mechanism of hydrothermal pretreatment and incineration

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-03-27 DOI:10.1016/j.biortech.2025.132429

Minghao Jin, Huan Liu, Hongping Deng, Hong Yao

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Abstract

Accurate assessment and enhancement of phosphorus (P) availability are critical for land application of sewage sludge and its thermal-treated products. By simulating different functioning pathways of P in soil, a novel multivariable scheme was developed to evaluate P availability from the perspective of mobility and bio-accessibility, then was applied to investigate the effects of hydrothermal pretreatment (HT), carbonaceous skeleton-assisted HT (CSkel-HT), and incineration on this topic. Sludge contained predominantly slow-release and microbial-available P (>50.0 % of total P). HT and incineration reduced available P through filtrate discharge, organic-P decomposition, and Fe/Al-P volatilization. Surprisingly, CSkel-HT addition promoted soluble Ca/MgHPO₄ and thermal-stable Fe/AlPO₄ formation under acidic conditions, which not only retained the slow-release and microbial-available P in hydrochar and ash, but also increased the rapid-available and plant-available P contents by 25.0 % and 300.0 %. Our scheme provided more informative insights than traditional single-index methods, and revealed the enhancing mechanism of CSkel-HT on P availability.

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.