前沿关注 进展：美国全面启动短程反硝化[PnDN]-Anammox示范项目

本项目题目“When a Detour Becomes a Shortcut: Going Full-scale with Partial Denitrification/Anammox as an Alternative Strategy for Mainstream Deammonification and Incorporating Biological Phosphorus Removal”，Project Amount999,670；项目实施周期是2020年9月至2023年8月31号，3周年时间。
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课题具体目标是通过提高厌氧氨氧化细菌(Anammox)在主流系统中的亚硝酸盐利用率，为快速去除氮过程的全面应用铺平道路。

! J! b3 U& k4 H基于部分反硝化(PDN)路线，不是通过洗出NOB（亚硝酸盐氧化细菌）的技术路径（传统短程硝化路径），而是通过PnDN过程将可能提供更可靠的亚硝酸盐来源，PnDN-Anammox技术路线可能是更有利于生产尺度上加速自养脱氮的实施和推进。




Description:

) N* ~! z) {8 q2 B2 M( @6 vNutrient management and removal technologies currently in use at point sources, such as wastewater treatment plants, are mainly biological (for nitrogen (N) and phosphorus (P) removal) or a combination of biological and chemical (for P removal) processes that have been used since the early 1970s. In recent years, research has been focused on alternative N removal strategies that can reduce capital, chemical, and energy costs. Mainstream shortcut N removal and mainstream deammonification processes represent a paradigm shift for the industry, offering the opportunity for sustainable N removal, energy neutral or even energy positive facilities and dramatic reductions in treatment costs, which has widespread environmental benefits in reducing the formation of HABs. But full-scale implementation has met with limited success.
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Objective:      
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The specific objective of this project is to pave the way for full-scale applications of shortcut N removal processes, by increasing nitrite availability for anaerobic ammonium oxidizing bacteria (anammox) in mainstream systems. Shortcut N removal systems developed based on the partial denitrification (PdN) route rather than the NOB (nitrite oxidizing bacteria) out-selection route, will likely provide more reliable nitrite production and could accelerate full-scale implementation of shortcut N technologies.   

Partial denitrification/anammox (PdNA) technologies span a range of readiness levels. The attached growth polishing PdNA concepts that will be explored further in this project have already been partially validated in pilot testing and full-scale treatment plants. HRSD transitioned their York River Treatment Plant post-dentification filters to PdNA almost two years ago, the first real full-scale example of mainstream anammox oxidizing a relevant amount of the influent ammonia load. Based on the successful outcome of piloting PdNA in a polishing moving bed biofilm reactor (MBBR) process, the pending full-scale nutrient upgrade for the HRSD James River plant will include this technology. This project will address remaining unknowns with designing and operating polishing PdNA processes.        

! R  }1 e( E6 e6 Z9 V' T/ }5 U6 Q. kIntegrated PdNA applications, whereby anammox are incorporated into the main plant BNR process pre- or post-anoxic zones, have been validated conceptually in laboratory and pilot studies at DC Water and Columbia University, and this project will move these concepts rapidly to full-scale application. This project will also evaluate the integration of biological P removal with PdNA shortcut N removal.
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