赤泥改性污泥基生物炭的制备及其吸附磷的效能和机理研究

张超; 熊仁久; 蔡美强; 董春颖

doi:10.13205/j.hjgc.202607018

赤泥改性污泥基生物炭的制备及其吸附磷的效能和机理研究

doi: 10.13205/j.hjgc.202607018

1. 浙江工商大学环境科学与工程学院, 杭州 310018;
2. 桐乡市城市污水处理有限责任公司, 浙江嘉兴 314500

基金项目:

国家自然科学基金项目（22176175）；宁波市公益性科技计划项目（2021S102，2023Z132）；浙江省微量有毒化学品健康风险评价重点实验室开放基金项目（2023002，2023003）；桐乡市通用人工智能研究院项目（TAGI2-B-2024-0010）

详细信息

作者简介:
张超，男，研究生。18607995373@163.com

通讯作者:
蔡美强，副教授，主要研究方向为污水、污泥和固废处理与资源化利用。caimeiqiang@163.com

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出版历程
- 收稿日期: 2025-07-03
- 网络出版日期: 2026-09-01

Research on preparation of red-mud-modified sludge-based biochar and its phosphorus adsorption efficiency and mechanism

1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;
2. Tongxiang Urban Sewage Treatment Co., Ltd., Jiaxing 314500, China

摘要

摘要: 针对磷资源短缺与水体富营养化治理的双重挑战，创新性地提出“以废治废”的可持续解决方案，即通过共热解赤泥和污泥制备赤泥改性污泥基生物炭（RMSBC）。设置不同的热解温度和原料比以调控其吸附效能，发现在热解温度为800 ℃、m（赤泥）/m（污泥）为3∶1条件下，生物炭对磷的最大吸附容量达到28.57 mg/g，较未改性生物炭（SBC）显著提升了350%。多表征手段分析表明：赤泥改性使其表面粗糙度和平均孔径增大，电负性降低，pH_pzc从2.01上升到了3.37。吸附过程符合拟二级动力学和Langmuir模型，机理以静电引力和表面沉淀为主。分子动力学模拟进一步证实了Fe₃O₄的关键作用静电吸附、表面沉淀、物理吸附。材料经过5次循环后仍保持初始值61%的吸附容量，针对实际水样的磷去除率达83%。该研究实现了赤泥和污泥的协同资源化利用，以赤泥作为铁氧化物库提供活性位点，污泥衍生生物炭构建多孔载体，为磷污染治理和资源回收提供了经济高效的解决方案。
- 赤泥 /
- 磷酸盐 /
- 改性污泥基生物炭 /
- 吸附 /
- 作用机制
Abstract: To address the dual challenges of phosphorus resource scarcity and eutrophication control， this study innovatively proposed a sustainable waste-treats-waste strategy by preparing red-mud-modified sludge-based biochar （RMSBC） through the co-pyrolysis of red mud and sewage sludge. By systematically optimizing the preparation conditions， the material achieved a maximum phosphorus adsorption capacity of 28.57 mg/g at 800 ℃ with a red mud-to-sludge mass ratio of 3∶1， representing a remarkable 350% enhancement on maximum adsorption capacity compared with unmodified biochar （SBC）. Comprehensive characterizations， including SEM， XRD， EDS， FT-IR， and XPS analyses， demonstrated that red mud modification effectively enlarged the pore size from 7.91 nm to 20.33 nm， reduced the material electronegativity， and increased the pH_pzc from 2.01 to 3.37. The adsorption process followed the pseudo-second-order kinetic and Langmuir isotherm models， with electrostatic attraction and surface precipitation identified as the dominant mechanisms. Molecular dynamics simulations further verified the crucial role of Fe₃O₄ in the adsorption process. The material retained 61% of its initial adsorption capacity after five regeneration cycles and achieved 83% phosphorus removal efficiency in real wastewater samples. This study successfully demonstrates the synergistic valorization of two industrial wastes： red mud serves as an iron oxide reservoir to provide active sites， while sewage-sludge-derived biochar acts as a porous support， offering an economically viable and efficient solution for phosphorus pollution control and resource recovery.
- red mud /
- phosphate /
- modified sludge-based biochar /
- adsorption /
- functioning mechanism

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