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COD预处理对CPNA工艺尿液脱氮效率的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第17期 页码: 10-17 栏目: 出版日期: 2023-09-01
Title:
Effect of COD Pretreatment on Urine Nitrogen Removal Efficiency of CPNA Process
作者:
胡兰兰1， 孙利利2， 陆茵2， 郑敏3， 汪诚文4， 徐康宁1
（1.北京林业大学环境科学与工程学院 水体污染源控制技术北京市重点实验室，北京 100083；2.北京国环清华环境工程设计研究院有限公司，北京 100084；3.昆士兰大学 水管理高等研究中心，澳大利亚；4.清华大学 环境学院，北京 100084）
Author(s):
HU　Lan-lan1， SUN　Li-li2， LU　Yin2， ZHENG　Min3， WANG　Cheng-wen4， XU　Kang-ning1
（1. Beijing Key Laboratory for Source Control Technology of Water Pollution， College of Environmental Science and Engineering， Beijing Forestry University， Beijing 100083， China； 2. Beijing Guohuan Tsinghua Environmental Engineering Design & Research Institute Co. Ltd.， Beijing 100084， China； 3. Advanced Water Management Centre， The University of Queensland， Australia； 4. School of Environment， Tsinghua University， Beijing 100084， China）
关键词:
尿液;  短程硝化;  厌氧氨氧化;  COD/N;  脱氮
Keywords:
urine;  partial nitrification;  anammox;  COD/N ratio;  nitrogen removal
摘要:
一体式短程硝化/厌氧氨氧化（CPNA）SBR工艺可以有效进行源分离尿液的原位脱氮处理。然而，尿液中高浓度的有机物不利于此工艺的长期稳定运行。为解决此问题，通过一种简易预处理方法去除尿液COD，并初步分析了COD预去除对CPNA-SBR脱氮效率的影响。在尿液中接种SBR污泥可以有效实现部分COD的预去除，这是一个耗氧过程，氧气来自于溶液表面的自然复氧作用，增加气液界面面积有助于加快COD的预去除速率。预处理使得尿液的COD/N从1.78~2.45降至0.81左右，将预处理后的尿液作为反应器进水，SBR运行的周期时间显著缩短约10%~45%，且总氮去除率可由83%升至93%。因此，这一预处理方法适用于尿液中COD的预去除，尤其适用于源分离尿液分散式原位脱氮处理工艺。
Abstract:
The combined partial nitrification/anammox (CPNA) SBR process is suitable for in?situ nitrogen removal from source-separated urine. However, high concentration of organic matter may pose a potential risk to the long-term stable performance of the process. In order to avoid this problem, a simple pretreatment technology was employed to remove COD in urine, and its influence on the nitrogen removal via the CPNA-SBR process was evaluated. Part of COD in urine was successfully removed in advance through inoculating the SBR sludge which used the oxygen diffusing from the liquid-gas surface. Increasing the liquid-gas surface could accelerate the removal of COD. The pretreatment reduced the COD/N ratio in urine from 1.78-2.45 to about 0.81. When pretreated urine was used for reactor influent, the cycle time of SBR was reduced significantly by about 10%-45%, and the removal rate of total nitrogen increased slightly from 83% to 93%. Therefore, this simple pretreatment is suitable for the removal of COD in urine in advance, especially in decentralized on site nitrogen removal process for source? separated urine.

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更新日期/Last Update: 2023-09-01