Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions

IF 3.1 4区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Biodegradation Pub Date : 2024-04-15 DOI:10.1007/s10532-024-10080-7

Ben-ze Chang, Shuai Zhang, Dong-zhi Chen, Kai-tuo Gao, Guang-feng Yang

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Abstract

In order to explore the operation performance, kinetic characteristics and bacterial community of the short-cut nitrification and denitrification (SND) system, the SND system with pre-cultured short cut nitrification and denitrification sludge was established and operated under different ferrous ion (Fe (II)) conditions. Experimental results showed that the average NH₄⁺–N removal efficiency (ARE) of SND system was 97.3% on Day 5 and maintained a high level of 94.9% ± 1.3% for a long operation period. When the influent Fe(II) concentration increased from 2.3 to 7.3 mg L⁻¹, the sedimentation performance, sludge concentration and organic matter removal performance were improved. However, higher Fe(II) of 12.3 mg L⁻¹ decreased the removal of nitrogen and COD_Cr with the relative abundance (RA) of Proteobacteria and Bacteroidetes decreased to 30.28% and 19.41%, respectively. Proteobacteria, Bacteroidetes and Firmicutes were the dominant phyla in SND system. Higher Fe(II) level of 12.3 mg L⁻¹ increase the RA of denitrifying genus Trichococcus (33.93%), and the denitrifying genus Thauera and Tolumonas dominant at Fe(II) level of no more than 7.3 mg L⁻¹.

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不同亚铁离子条件下短程硝化和反硝化系统的性能、动力学特征和细菌群落

为了探索短切硝化反硝化（SND）系统的运行性能、动力学特征和细菌群落，建立了预培养短切硝化反硝化污泥的 SND 系统，并在不同亚铁离子（Fe (II)）条件下运行。实验结果表明，SND 系统对 NH4+-N 的平均去除率（ARE）在第 5 天达到 97.3%，并在较长时间内保持在 94.9%±1.3% 的较高水平。当进水 Fe(II) 浓度从 2.3 mg L-1 增加到 7.3 mg L-1 时，沉淀性能、污泥浓度和有机物去除性能均有所改善。然而，当 Fe(II) 浓度达到 12.3 mg L-1 时，氮和 CODCr 的去除率下降，变形菌和类杆菌的相对丰度（RA）分别下降到 30.28% 和 19.41%。在 SND 系统中，变形菌、类杆菌和固着菌是优势菌门。较高的 Fe(II) 含量（12.3 毫克/升-1）增加了反硝化属毛球菌的 RA（33.93%），而反硝化属 Thauera 和 Tolumonas 在 Fe(II) 含量不超过 7.3 毫克/升-1 时占优势。

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来源期刊

Biodegradation 工程技术-生物工程与应用微生物

CiteScore

5.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Biodegradation publishes papers, reviews and mini-reviews on the biotransformation, mineralization, detoxification, recycling, amelioration or treatment of chemicals or waste materials by naturally-occurring microbial strains, microbial associations, or recombinant organisms. Coverage spans a range of topics, including Biochemistry of biodegradative pathways; Genetics of biodegradative organisms and development of recombinant biodegrading organisms; Molecular biology-based studies of biodegradative microbial communities; Enhancement of naturally-occurring biodegradative properties and activities. Also featured are novel applications of biodegradation and biotransformation technology, to soil, water, sewage, heavy metals and radionuclides, organohalogens, high-COD wastes, straight-, branched-chain and aromatic hydrocarbons; Coverage extends to design and scale-up of laboratory processes and bioreactor systems. Also offered are papers on economic and legal aspects of biological treatment of waste.