A review of modified A2/O process application for nitrogen and phosphorus removal from low C/N wastewater

doi:10.19965/j.cnki.iwt.2021-0874

Abstract

Abstract:

At present，the carbon to nitrogen ratio（C/N） of urban wastewater in China is generally low，and there exists many problems in traditional A²/O process applied in treatment of low C/N wastewater. The improved A²/O process can dissolve the defects of the traditional A²/O process in the operation process，and improve its nitrogen and phosphorus removal effect. Based on the theory of biological nitrogen and phosphorus removal，the problems in the operation of the traditional A²/O process were summarized，and the characteristics and advantages of several improved processes（inverted A²/O，UCT，MUCT，JHB，Bardenpho） were outlined. Furthermore，the operation optimization methods and principles of segmental feed，supplementary carbon source and additional filler were analyzed. Compared with the traditional A²/O process，the advantages of the modified A²/O process were mainly reflected in the following：optimizing the position of the mixed liquor return and sludge return，reducing the problem of nitrate limitation and sludge age contradiction，optimizing layout of the structure， and alleviating the competition for carbon source，adjusting feed water ratio to improve the utilization rate of the system carbon source and reduce the cost of additional carbon source，using additional filler to reduce the influence of mud discharge on the nitrification rate and improve the impact resistance of the system. Finally，future research directions for the improved A²/O process were proposed：combining different processes to achieve complementary advantages，researching new liquid and solid carbon sources to balance economic costs and environmental benefits，and enhancing microbial culture to further strengthen the system nitrogen and phosphorus removal capacity.

Key words: A²/O process improvement, low C/N wastewater, nitrogen and phosphorus removal, suspension filler, carbon source

摘要：

目前我国城市污水碳氮比（C/N）普遍较低，传统A²/O工艺运用于低C/N废水处理时存在诸多问题。改良A²/O工艺能针对性地解决传统A²/O工艺在运行过程中的缺陷，改善脱氮除磷效果。基于生物脱氮除磷理论，总结了传统A²/O工艺运行中存在的问题，概述了几种改良工艺（倒置A²/O、UCT、MUCT、JHB、Bardenpho）的特点及优势，并分析了分段进水、补充碳源、增设填料的运行优化方式和原理。相比于传统A²/O工艺，改良A²/O工艺的优势主要体现在：优化了混合液回流和污泥回流位置，减少了硝酸盐限制及污泥龄矛盾问题；优化了构筑物布局，缓解了碳源竞争；通过调整进水配比，提高了系统碳源利用率，降低了外加碳源成本；通过增设填料，降低了排泥对硝化速率的影响，并提高了系统抗冲击能力。最后，提出未来改良型A²/O工艺的研究方向：组合不同工艺以实现优势互补；研究新型液体和固体碳源，兼顾经济成本和环境效益；强化微生物培养，进一步提升系统脱氮除磷能力。

关键词: A²/O工艺改良, 低C/N废水, 脱氮除磷, 悬浮填料, 碳源

CLC Number:

X703.1

Baoming HU, Liang LI, Quan QI, Zheng LIU, Xuqing LIU. A review of modified A²/O process application for nitrogen and phosphorus removal from low C/N wastewater[J]. Industrial Water Treatment, 2022, 42(10): 46-52.

胡宝明, 李亮, 祁佺, 刘峥, 刘煦晴. 改良A²/O工艺对低C/N废水脱氮除磷的应用综述[J]. 工业水处理, 2022, 42(10): 46-52.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0874

https://www.iwt.cn/EN/Y2022/V42/I10/46

Figures/Tables 7

References 44

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工艺名称	克服难点	工艺不足	参考文献
倒置A²/O	消除了硝酸盐的干扰；提高了碳源利用率，缓解了碳源竞争；取消内回流，消除了内回流的限制	厌氧释磷阶段得不到优质碳源，总磷去除效果不佳	〔15-17〕
UCT	避免了内回流限制，提高了脱氮效率；降低了厌氧段硝酸盐含量，可提升低C/N污水除磷效率	因内回流交叉，不能完全消除回流的DO对厌氧释磷的影响	〔21-23〕
MUCT	避免了内回流交叉过程中DO对厌氧释磷的限制，提高了除磷效果；内回流和污泥回流独立控制，可缓解污泥龄矛盾问题	操作较为复杂；需增设独立的回流系统	〔29-30〕
JHB	降低了回流污泥中硝酸盐含量过高的影响；充分利用内部碳源，提高了脱氮效果	总磷去除效果不佳，需要额外补充碳源	〔31-32〕
Bardenpho	有效避免了硝酸盐的影响；提高了内部碳源利用率	处理低C/N污水时，需要额外投加优质碳源以提高TN去除率	〔35〕

工艺名称	克服难点	工艺不足	参考文献
倒置A²/O	消除了硝酸盐的干扰；提高了碳源利用率，缓解了碳源竞争；取消内回流，消除了内回流的限制	厌氧释磷阶段得不到优质碳源，总磷去除效果不佳	〔15-17〕
UCT	避免了内回流限制，提高了脱氮效率；降低了厌氧段硝酸盐含量，可提升低C/N污水除磷效率	因内回流交叉，不能完全消除回流的DO对厌氧释磷的影响	〔21-23〕
MUCT	避免了内回流交叉过程中DO对厌氧释磷的限制，提高了除磷效果；内回流和污泥回流独立控制，可缓解污泥龄矛盾问题	操作较为复杂；需增设独立的回流系统	〔29-30〕
JHB	降低了回流污泥中硝酸盐含量过高的影响；充分利用内部碳源，提高了脱氮效果	总磷去除效果不佳，需要额外补充碳源	〔31-32〕
Bardenpho	有效避免了硝酸盐的影响；提高了内部碳源利用率	处理低C/N污水时，需要额外投加优质碳源以提高TN去除率	〔35〕

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A review of modified A²/O process application for nitrogen and phosphorus removal from low C/N wastewater

改良A²/O工艺对低C/N废水脱氮除磷的应用综述

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