In Situ Rapid Start-Up and Enhanced Nutrient Removal in a Coupled Partial Nitritation/Anammox and Denitratation/Anammox System: Insights into Multivariate Drivers of Process Performance
Yujie Chen, Gaoxuefeng Feng, Guangze Guo, Yanyan Li, Yu-You Li
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引用次数: 0
Abstract
Anammox-based processes are energy- and cost-efficient
for wastewater
nitrogen removal, but practical application is limited by unavoidable
nitrate production, slow start-up, and instability under fluctuating
influent conditions. Here, a novel hydroxyapatite-enhanced coupled
partial nitritation and anammox (PNA) and partial denitratation and
anammox (PDA) system was developed for simultaneous high-rate nutrient
removal and phosphorus recovery. Compared with a standalone PNA reactor,
the integrated system increased nitrogen and phosphorus removal efficiencies
from 77% and 76% to 91% and 85%, respectively, achieving a nitrogen
removal rate of 2.8 ± 0.2 kg N/m3/d. The reuse of
discharged PNA sludge facilitated the operation and early establishment
of the PDA reactor, supporting rapid system development and stable
performance. Notably, anammox ultimately contributed over 95% of total
nitrogen removal, confirming highly efficient autotrophic nitrogen
conversion. A trade-off between maximizing anammox contribution and
overall PDA removal efficiency was identified. Mechanistically, multivariate
analysis revealed that nitrogen species composition, reactor interactions,
and carbon supply jointly governed system performance. This study
demonstrates a robust and energy-efficient integrated anammox-based
system and provides mechanistic and operational insights for advanced
nutrient removal and resource-oriented wastewater treatment.
厌氧氨氧化工艺在去除废水氮方面具有能源和成本效益，但由于不可避免的硝酸盐产生、启动缓慢以及进水条件波动下的不稳定性，实际应用受到限制。本研究开发了一种新型的羟基磷灰石增强的部分硝化和厌氧氨氧化（PNA）和部分脱硝和厌氧氨氧化（PDA）耦合系统，以同时实现高速率的营养物去除和磷回收。与单独的PNA反应器相比，集成系统将氮和磷的去除率分别从77%和76%提高到91%和85%，达到2.8±0.2 kg N/m3/d的脱氮率。排放的PNA污泥的再利用促进了PDA反应器的运行和早期建立，支持了系统的快速开发和稳定的性能。值得注意的是，厌氧氨氧化最终贡献了总氮去除率的95%以上，证实了高效的自养氮转化。确定了厌氧氨氧化贡献最大化和PDA总体去除效率之间的权衡。从机理上讲，多变量分析表明，氮的种类组成、反应器的相互作用和碳供应共同决定了系统的性能。该研究展示了一个强大且节能的厌氧氨氧化综合系统，并为高级营养物去除和资源化废水处理提供了机制和操作见解。
期刊介绍：
ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources.
The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope.
Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.
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