ZHAOLong,ZHANGXian-qing,SONGBo,et al.Impact of Influent Mode and Sludge Form on Dissimilatory Nitrate Reduction to Ammonium in a Mixed Carbon Source System[J].China Water & Wastewater,2025,41(9):17-25.
进水方式与污泥形态对混合碳源系统DNRA的影响
- Title:
- Impact of Influent Mode and Sludge Form on Dissimilatory Nitrate Reduction to Ammonium in a Mixed Carbon Source System
- Keywords:
- dissimilatory nitrate reduction to ammonium (DNRA); denitrification; mixed carbon sources; influent mode; sludge form
- 摘要:
- 异化硝酸盐还原为铵（DNRA）是全球氮循环中不可缺少的部分，但目前关于污水处理系统中DNRA的研究较少。为此，以乙酸钠、葡萄糖和无水乙醇等比例混合碳源为底物，采用两个相同的ASBR反应器（分别代表生物膜系统和活性污泥系统），考察不同污泥形态及进水方式对DNRA菌富集及产铵性能的影响。结果表明，经过145 d的驯化培养，两套反应器均具备一定产铵能力且成功富集出DNRA菌，平均产铵率分别为15.08%和3.34%，属水平上DNRA菌占比分别为4.66%和3.37%，其中优势菌属均为Desulfobulbus。对比发现，当进水方式为间歇流时，两个系统的产铵率相当且均低于5%；而将生物膜反应器进水方式改为连续流，运行稳定后系统的产铵率最高可达到16.57%，远远高于活性污泥系统，说明连续流更有利于DNRA菌产铵。
- Abstract:
- Dissimilatory nitrate reduction to ammonium (DNRA) constitutes an essential component of the global nitrogen cycle. However, limited research has been conducted on DNRA within wastewater treatment systems. In this study, sodium acetate, glucose, and anhydrous ethanol were utilized as substrates, and two identical anaerobic sequencing batch reactors (ASBR), biofilm system and activated sludge system, were employed to investigate the effects of different sludge forms and influent modes on the enrichment and ammonium production of DNRA bacteria. Following 145 days of acclimation and cultivation, both reactors achieved certain capability in ammonium production and successfully enriched DNRA bacteria. The average ammonium production rates were 15.08% and 3.34%, respectively. At the genus level, the proportions of DNRA bacteria were 4.66% and 3.37%, respectively. Desulfobulbus was identified as the predominant bacterial genus. When the reactors were operated in intermittent flow, the ammonium yield in both systems was comparable and remained below 5%. However, upon switching the inflow mode of the biofilm reactor to continuous flow, the system achieved a maximum ammonium production rate of 16.57% after reaching stable operation， which was significantly higher than that of the activated sludge system, suggesting that continuous flow was more favorable for ammonium production by DNRA bacteria.
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