摘要
为了探索提升基于内源反硝化的厌氧/好氧/缺氧(Anaerobic/Oxic/Anoxic,AOA)工艺脱氮效率的方法,本研究分别考察了前置厌氧时间和好氧阶段溶解氧(DO)对内源反硝化脱氮速率的影响.结果表明:在进水COD浓度为155.1mg/L时,厌氧时间为60min,缺氧阶段内源反硝化速率(EDNR)最高;在不同的进水COD条件下,控制适当的厌氧时间,当内碳源中的聚羟基烷酸酯(PHAs)积累量达到峰值时,EDNR最高;EDNR受到好氧阶段DO过量或不足的影响,当DO控制为1mg/L时,EDNR最高.通过厌氧时间优化与DO控制可将EDNR分别提高31.7%,18.4%.本研究为AOA工艺提高后置缺氧阶段EDNR提供了可行策略,有利于AOA工艺设计与运行策略优化.
The Anaerobic/Aerobic/Anoxic(AOA)process based on endogenous denitrification gained widespread attention in recent years with the benefits of carbon saving and consumption reduction.Nitrogen is mainly removed via the endogeous denitrification occurred in the post-anoxic phase of the AOA process.Therefore,increasing endogenous denitrification rate(EDNR)is the crucial to enhance the nitrogen removal efficiency.To explore the methods to improve the nitrogen removal efficiency of AOA process,the effects of the anaerobic duration and dissolved oxygen(DO)concentration in the aerobic phase on EDNR were investigated in this study.Results showed that the EDNR was the maximum when the anaerobic duration was 60min at the influent COD concentration of 155.1mg/L.Under different influent COD concentration,the accumulation of polyhydroxyalkanoates(PHAs)(a kind of intracellular carbon)reached the peak by controlling the appropriate anaerobic duration,and the EDNR was maximized.The EDNR was affected by excessive or insufficient DO in aerobic phase,and the highest EDNR was achieved when DO was controlled at 1mg/L.The EDNR was increased by 31.7%and 18.4%through anaerobic duration optimization and DO control,respectively.This paper provided a feasible strategy to enhance the EDNR in the post-anoxic phase of the AOA process,which is conducive to the optimization of the AOA process designs and operation strategies.
作者
安泽铭
丁静
高歆婕
彭永臻
AN Ze-ming;DING Jing;GAO Xin-jie;PENG Yong-zhen(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Engineering Research Center of Beijing,Beijing University of Technology,Beijing 100124,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第2期667-674,共8页
China Environmental Science
基金
广州市产业领军人才集聚工程项目(CYLJTD-201607)
污水生物处理与过程控制技术北京市国际科技合作基地资助
北京市教委资助项目。
关键词
生物脱氮
内源反硝化速率
厌氧时间
溶解氧
biological nitrogen removal
endogenous denitrification rate
anaerobic duration
dissolved oxygen control
