研究报告
胡星宝,粟畅,伍思浩,种云霄.赤铁矿对园林落叶植物生物质水解液中溶解性芳香物质的调控效果[J].环境科学学报,2022,42(12):79-86
赤铁矿对园林落叶植物生物质水解液中溶解性芳香物质的调控效果
- Effect of hematite on the modulation of dissolved aromatic substances in anaerobic hydrolysates of deciduous plant biomass
- 基金项目：国家自然科学基金面上项目（No. 51778245）；2021年度广州市水务科技项目
- 作者
- 单位
- 胡星宝
- 华南农业大学资源环境学院， 广东省农业农村污染治理与环境安全重点实验室，广州 510642
- 粟畅
- 华南农业大学资源环境学院， 广东省农业农村污染治理与环境安全重点实验室，广州 510642;爱尔兰高威国立大学工程与信息学院，高威，H91 TK33
- 伍思浩
- 华南农业大学资源环境学院， 广东省农业农村污染治理与环境安全重点实验室，广州 510642
- 种云霄
- 华南农业大学资源环境学院， 广东省农业农村污染治理与环境安全重点实验室，广州 510642
- 摘要：植物生物质作为污水反硝化脱氮碳源，存在出水色度和COD升高的问题，木质素水解产生的多酚类物质等芳香化合物是导致该问题的根本原因.由于赤铁矿对木质素酚具有吸附潜力，本研究尝试采用赤铁矿调控植物生物质厌氧水解产生的溶解性芳香物质，避免其进入水解液后形成不易被反硝化利用的COD和色度.研究利用预处理园林树木黄葛榕落叶和赤铁矿形成共厌氧水解系统，以未加入赤铁矿的系统为对照，考察了赤铁矿共厌氧对水解液的UV254、SCOD、挥发性有机酸、亚铁等影响；在此基础上进一步分析了赤铁矿对预处理黄葛榕落叶厌氧水解液中多酚类物质的吸附去除特性.结果表明，与无赤铁矿的厌氧水解系统相比，赤铁矿的共厌氧能有效地降低水解液的UV254，并提升SCOD和乙酸产生速度和浓度，但后期会发生活跃的铁还原过程；赤铁矿能够有效地吸附去除黄葛榕木质纤维素厌氧水解液中的多酚类物质，吸附过程与准一级动力学方程拟合效果相对优于准二级.根据Langmuir方程对其吸附等温线拟合结果，赤铁矿对多酚的饱和吸附量为1.399 mg·g-1；黄葛榕落叶厌氧水解液经赤铁矿的吸附处理后，以其配制的纤维素酶液的滤纸酶活提升了11.68%.因此，共厌氧系统中赤铁矿对多酚类物质的吸附去除，不但降低了水解液中溶解性芳香有机化合物的含量，而且也可以缓解多酚类物质对纤维素酶等水解酶活性的抑制，提升反硝化碳源乙酸生产性能.赤铁矿与落叶植物生物质共厌氧水解在调控水解液溶解性芳香类物质、提升水解液反硝化性能方面具有应用潜力.
- Abstract：The utilization of plant biomass for wastewater denitrification can cause increased effluent color and COD， which may be induced mainly by the released aromatics such as polyphenols during lignin hydrolysis. Since hematite possesses a high adsorption potential for aromatics， it was adopted to regulate dissolved aromatics produced during anaerobic hydrolysis of plant biomass to solve the problem of increased effluent color and COD. Compared with a control without the addition of hematite， the pretreated withered leaves of Ficus virens Aiton were hydrolyzed with the addition of hematite， and the effect of hematite on hydrolysate UV254， soluble COD （SCOD）， volatile organic acid and Fe（II） were investigated. Furthermore， the removal of polyphenols in lignocellulosic anaerobic hydrolysate（LAH） of Ficus virens Aiton through adsorption was analyzed. Compared to the control without hematite， the addition of hematite reduced the hydrolysate UV254 significantly， and promoted the production rate and concentrations of SCOD and acetate. At the later stage of anaerobic hydrolysis， an intensive iron-reducing process occurred. Hematite showed excellent adsorption capacity for polyphenols originated from Ficus virens Aiton， and the adsorption process was relatively fitted better with the pseudo-first-order equation than the pseudo-second-order one. The adsorption capacity of hematite was 1.399 mg·g-1 according to the isotherm model fitting with the Langmuir equation. Therefore， the adsorption of polyphenols by hematite not only removed soluble aromatics but also alleviated the inhibition of hydrolase such as cellulase by polyphenols， resulting in the improved production of denitrification carbon sources such as acetic acid. Anaerobic hydrolysis deciduous plant biomass with the addition of hematite has a promising application in regulating aromatics in hydrolysate and further enhancing denitrification performance of hydrolysate.
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