Exogenous substances promote aerobic granular sludge formation and pollutants removal in treating petrochemical wastewater at low concentration

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-05-24 DOI:10.1016/j.bej.2025.109804

Xianhuai Huang , Yankun Liu , Hao Hu , Yanjun Liu , Xiangchong Yu , Liankun Dong , Zhenghao Li

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引用次数: 0

Abstract

Aerobic granular sludge (AGS) technology shows advances (e.g., great sedimentation ability) in wastewater treatment. However, the difficulty and long start-up time for sludge granulation still restricts the practical application of AGS technology, especially in treating low-concentration wastewater. In this work, the effects of two exogenous substances (i.e., granular activated carbon (GAC) and Fe^2 + based flocculant (Fe²⁺)) on AGS formation in treating real low-concentration petrochemical wastewater were evaluated. The results showed that additions of sole GAC and Fe all increased the removal of COD and NH₄⁺-N, compared to the control bioreactor. Noticeably, the introductions of sole GAC and Fe²⁺ greatly shortened the granulation time (from 60 days to 30–50 days) and increased the granular size (from 380 μm to 520–700 μm at day 60). The accelerated granulation process could be attributed to the nucleating effect of GAC and flocculation of Fe²⁺, which all improved the sedimentation performance of activated sludge. In addition, the promoted secretion of extracellular polymeric substances (EPS) and altered bacterial community by GAC and Fe²⁺ also contributed to the granulation of activated sludge. These findings may provide new insights for the enhancement of sludge granulation by exogenous substances in treating low-concentration petrochemical wastewater.

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外源物质促进低浓度石化废水好氧颗粒污泥的形成和污染物的去除

好氧颗粒污泥（AGS）技术在污水处理中显示出进步（例如，良好的沉降能力）。但污泥造粒难度大、启动时间长等问题仍然制约着AGS技术的实际应用，特别是在处理低浓度废水方面。在本研究中，研究了两种外源物质（即颗粒活性炭（GAC）和Fe2 +基絮凝剂（Fe2+））对实际低浓度石化废水中AGS形成的影响。结果表明，与对照生物反应器相比，单独添加GAC和Fe均提高了COD和NH4+-N的去除率。结果表明，单独添加GAC和Fe2+显著缩短了制粒时间（从60天缩短到30 ~ 50天），增大了颗粒尺寸（从380 μm增加到520 ~ 700 μm）。GAC的成核作用和Fe2+的絮凝作用提高了活性污泥的沉降性能，加速了造粒过程。此外，GAC和Fe2+促进细胞外聚合物质（EPS）的分泌和细菌群落的改变也有助于活性污泥的造粒。研究结果为外源物质对低浓度石化废水污泥颗粒化的强化作用提供了新的思路。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.