Simultaneous nitrogen removal and phosphorus recovery in granular sludge-based partial denitrification/anammox-hydroxyapatite precipitation (PD/A-HAP) process under low C/N ratio and dissolved oxygen limitation.

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

Bioresource Technology Pub Date : 2025-01-10 DOI:10.1016/j.biortech.2025.132045

Lijie Chen, Zhenjun Wu, Jiayu Niu, Yihan Wang, Ming Cai, Jiale Xi, Yanlei Cui, Lang Cheng, Xinyi Fan

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引用次数: 0

Abstract

This study integrates partial denitrification/Anammox (PD/A) with hydroxyapatite (HAP) crystallization in a single reactor, achieving simultaneous nitrogen and phosphorus removal along with phosphorus recovery. By adjusting pH, sludge concentration, low COD/TN ratio, and applying moderate dissolved oxygen stress, the system operated stably and promoted the synergistic growth of HAP and biomass. Results showed a nitrogen removal efficiency (NRE) of 94.13 % and a phosphorus removal efficiency (PRE) of 73.6 %. Metagenomic analysis revealed that under dissolved oxygen stress, The abundance of Candidatus Brocadia increased from 1 % to 26.1 %, significantly boosting anammox activity. indicating enhanced microbial activity. The upregulation of related genes (sdh, suc, hzs) further boosted AnAOB activity. HAP was identified as the main inorganic component of the granule. This process shows strong potential for nitrogen and phosphorus removal with resource recovery in wastewater treatment.

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低碳氮比和溶解氧限制下颗粒污泥部分反硝化/厌氧氨氧化-羟基磷灰石沉淀（PD/A-HAP）工艺的同时脱氮和磷回收

本研究将部分反硝化/厌氧氨氧化（PD/A）与羟基磷灰石（HAP）结晶结合在一个反应器中，实现了同时脱氮除磷和磷回收。通过调节pH、污泥浓度、低COD/TN比、施加适度的溶解氧胁迫，使系统稳定运行，促进HAP和生物量协同生长。结果表明，该工艺的除氮效率（NRE）为94.13 %，除磷效率（PRE）为73.6 %。宏基因组分析显示，在溶解氧胁迫下，候选菌Brocadia的丰度从1 %增加到26.1 %，显著提高了厌氧氨氧化活性。表明微生物活性增强。相关基因（sdh, such, hzs）的上调进一步提高了AnAOB的活性。羟基磷灰石是该颗粒的主要无机成分。该工艺在污水处理中具有很强的资源化脱氮除磷潜力。

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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.