Increasing the light–dark ratio enhances nitrogen removal performance by altering the mechanism in photogranules

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-03-15 DOI:10.1016/j.biortech.2025.132400

Xiaodi Xing , Jing Zhu , Zhipeng Li , Guoyu Zhang , Weirun Li , Haili Tan , Binghan Xie , Yixuan Yang , Shuyu Zhao , Yi Ding , Hong You

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Abstract

Photogranules provide a cost-effective solution for treating mariculture wastewater. The impact of light: dark ratios on nitrogen removal needs further study. We tested four photogranular reactors with different light: dark ratios and found that higher ratios increased total inorganic nitrogen (TIN) removal rate, achieved 99 % every 48 h at a 5.5 h:0.5 h ratio. Kinetic and metagenomic analyses showed that increased TIN removal was mainly due to a significant transformation in the nitrogen removal mechanism of photogranules. At 5.5 h:0.5 h, diatoms replaced the outer cyanobacteria, causing nitrifying bacteria to disappear via direct and indirect inhibition. In addition, the mechanisms by which photogranules remove nitrate nitrogen are diverse. Adjusting the light: dark ratio could change the nitrogen removal mechanism of photogranules in mariculture wastewater treatment and enhance their nitrogen removal performance. This offered insights into controlling light − related parameters of photogranules for practical engineering applications.

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.