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美国EPA启动短程反硝化(PnDN)-Anammox的Full-scale示范项目

文章来源:admin 更新时间:2020/09/30

   

美国EPA发动短程反硝化(PnDN)-Anammox的Full-scale演示项目 

 

课题详细方针是经过进步厌氧氨氧化细菌(Anammox)在干流体系中的亚硝酸盐利用率,为快速去除氮进程的全面使用铺平道路。

根据部分反硝化(PDN)道路,不是经过洗出NOB(亚硝酸盐氧化细菌)的技能途径(传统短程硝化途径),而是经过PnDN进程将或许供给更牢靠的亚硝酸盐来历,PnDN-Anammox技能道路或许是更有利于出产尺度上加快自养脱氮的施行和推动。

Deion:

Nutrient management and www.w66.com利来国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.

Objective:

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.

Integrated 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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