Phosphorus capturing from biogas slurry using different adsorbents: adsorption and mechanism.

IF 2.6 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Water Science and Technology Pub Date : 2025-09-01 Epub Date: 2025-08-28 DOI:10.2166/wst.2025.129

Mingda Li, Mengfei Li, Xin Li

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引用次数: 0

Abstract

The recovery and utilization of phosphorus elements from biogas slurry can effectively prevent secondary pollution caused by biogas slurry application in farmland and eutrophication of water bodies. This study systematically evaluated the adsorption efficiency of soluble P from biogas slurry using biochars (corn straw biochar (CSB), cherry wood biochar (CWB), and cattle manure biochar (CMB)) and biomass power plant residues ash (BPP-ash) and slag (BPP-slag). Physicochemical characterization revealed that BPP-slag exhibited the highest soluble P removal efficiency (92.17%) at 30 g L^-1 dosage, attributed to its high metal oxide content (e.g., Ca²⁺, Mg²⁺). Kinetic and isotherm analyses indicated that adsorption followed pseudo-second-order kinetics (R² > 0.96) and Freundlich models (R² > 0.98), suggesting chemisorption-dominated multilayer adsorption. Mineral precipitation (contributing >70% to total adsorption) was identified as the primary mechanism via XRD and quantitative analysis. This work highlights the potential of biomass power plant residues as cost-effective adsorbents for P capturing, offering a sustainable strategy for waste valorization.

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不同吸附剂对沼液中磷的吸附及机理研究。

沼液中磷元素的回收利用可以有效防止沼液在农田施用造成的二次污染和水体富营养化。采用生物炭(玉米秸秆生物炭（CSB）、樱桃木生物炭（CWB）、牛粪生物炭（CMB）和生物质电厂残灰（BPP-ash）、炉渣（bpp -渣）对沼液中可溶性磷的吸附效果进行了系统评价。理化性质分析表明，在30 g L-1投加量下，bpp渣中Ca2+、Mg2+等金属氧化物的含量较高，对可溶性磷的去除率最高（92.17%）。动力学和等温线分析表明，吸附符合拟二级动力学（R2 > 0.96）和Freundlich模型（R2 > 0.98），表明化学吸附为主的多层吸附。通过XRD和定量分析，确定矿物沉淀为主要吸附机理，对吸附总量的贡献率为70%。这项工作强调了生物质发电厂残留物作为P捕获的成本效益吸附剂的潜力，为废物增值提供了可持续的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Science and Technology 环境科学-工程：环境

CiteScore

4.90

自引率

3.70%

发文量

366

审稿时长

4.4 months

期刊介绍： Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.