不同配比固相碳源的制备及其释碳性能

朱圣辉; 周钢; 朱烨; 苗令占; 侯俊

doi:10.13205/j.hjgc.202604007

不同配比固相碳源的制备及其释碳性能

doi: 10.13205/j.hjgc.202604007

河海大学环境学院, 南京 210024

基金项目:

国家重点研发计划项目（2023YFC3208903）；西藏自治区科技计划项目（XZ202502JD0001）

详细信息

作者简介:
朱圣辉,主要研究方向为水环境综合治理。958854461@qq.com

通讯作者:
苗令占,教授。lzmiao@hhu.edu.cn

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出版历程
- 收稿日期: 2025-09-08
- 网络出版日期: 2026-06-06
- 刊出日期: 2026-04-01

Preparation of solid-phase carbon sources with different ratios and their carbon release properties

College of Environment, Hohai University, Nanjing 210024, China

摘要

摘要: 鉴于污水处理厂尾水C/N比普遍较低，而投加传统液相碳源难以稳定适用，亟需研究固相碳源组成及设计，优化其释碳的“量”和“质”，服务低C/N脱氮工艺并拓展至新污染物环境行为分析。以秸秆、木屑和玉米芯为天然纤维素材料，按不同PHBV/纤维素质量比制备了9类复合固相碳源，并通过动态释放实验结合DOC、UV-Vis和三维荧光（EEM）表征其释碳特性。结果表明：在碳源组分相同的情况下，随着纤维素材料占比的提高，玉米芯固相碳源表现出与秸秆和木屑固相碳源不同甚至相反的释碳规律。当碳源组分相同时，木屑或秸秆材料比例的增加可显著加快释碳速率，提升释碳总量与周期，同时降低DOM的芳香性与分子量，并促进色氨酸、酪氨酸等蛋白质类组分的释放，证明了材料配比能够协同调控DOM的生物可利用性。此外，在相同配比条件下，玉米芯复合固相碳源在多项参数上表现优于秸秆与木屑体系，其释碳总量适中且释碳周期均超过134 h，保证了稳定的供碳能力；在释碳“质”的层面，其释放的DOM芳香性和分子量较低、腐殖质比例偏低，表现出更高的可生物利用性。综合来看，玉米芯体系在碳源可生物利用性与工程应用潜力方面具有显著优势。
- 固相碳源 /
- 缓释 /
- 芳香性 /
- 腐殖质 /
- 分子量
Abstract: Given the widespread occurrence of low C/N ratios in treated wastewater effluent and the instability of conventional liquid carbon sources， it is necessary to investigate solid-phase carbon sources in terms of composition and design. The goal is to optimize both the quantity and quality of carbon release for denitrification under low C/N conditions and to extend research into the environmental behavior of emerging contaminants. In this study， nine composite solid-phase carbon sources were prepared from straw， sawdust， and corncob as natural cellulose materials with different PHBV-to-cellulose mass ratios. Their carbon release characteristics were evaluated via dynamic release experiments combined with dissolved organic carbon （DOC） analysis， UV-Vis spectroscopy， and excitation-emission matrix （EEM） fluorescence spectroscopy. The results showed that with identical carbon-source components， increasing the proportion of cellulose caused corncob-based solid-phase carbon sources to exhibit release patterns that differed from， and in some cases were opposite to， those of straw- and sawdust-based systems. When the carbon-source composition was the same， increasing the proportion of straw or sawdust accelerated the release rate， increased total release and release duration， reduced the aromaticity and molecular weight of the released dissolved organic matter （DOM）， and promoted the release of protein-like DOM such as tryptophan and tyrosine， indicating that material ratios can synergistically regulate DOM bioavailability. Under identical ratio conditions， corncob-based composite carbon sources outperformed straw- and sawdust-based systems on multiple parameters： they achieved a moderate total carbon release while maintaining release durations exceeding 134 hours， thereby ensuring a stable carbon supply. The DOM they released exhibited lower aromaticity， smaller molecular weight， and a lower proportion of humic substances， indicating higher bioavailability. Overall， the corncob-based system demonstrated significant advantages in both bioavailability and engineering application potential.
- solid-phase carbon source /
- sustained release /
- aromaticity /
- humic substances /
- molecular weight size

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