摘要
采用厌氧/缺氧/好氧与生物接触氧化工艺组成的双污泥系统(A^2/O-BCO)处理实际生活污水.通过投加乙酸钠调节进水碳氮比(C/N=2.44~8.85),考察了系统的反硝化除磷特性.试验结果表明:进水有机物主要是通过改变硝化性能(即缺氧段反硝化负荷)以及聚-β-羟基链烷酸脂(PHA)的贮存和利用,进而影响系统的脱氮除磷效果.当进水C/N为4~5时,COD、TN和PO_4^(3-)-P去除率分别达到88%,80%和96%,实现了有机物、氮和磷的同步高效去除.碳平衡分析表明,A^2/O反应器去除的COD占去除总量的71.86%~77.28%,BCO反应器去除的COD仅占2%~12%,碳源的高效利用是A^2/O-BCO工艺在低C/N条件下实现深度脱氮除磷的重要原因.此外,通过进水C/N与曝气量、硝化液回流比、厌/缺氧反应时间等相关性的分析,提出了系统的优化运行策略.
A two-sludge system combined anaerobic/anoxic/oxic with biological contact oxidation process（A^2/O-BCO） was used to treat domestic wastewater.By adding sodium acetate to adjust influent carbon/nitrogen ratio（C/N=2.44 ～ 8.85）,the denitrifying phosphorus removal characteristics of the system were investigated.The results showed that nitrification performance（anoxic denitrifying loading） and poly-β-hydroxyalkanoates（PHA） storage and utilization were mainly influenced by organic matter,which further effected the nitrogen and phosphorus removals.When the influent C/N ratio was 4 ～ 5,COD,TN and PO_4^（3-）-P removals reached to 88%,80% and 96% respectively,which achieved high-efficiency removal of organic matter,nitrogen and phosphorus simultaneously.The material balance analysis of carbon revealed that COD removal in the A^2/O reactor was 71.86% ～ 77.28% of the total COD removal,and COD removal in the BCO reactor only accounted for 2%～ 12%,where the efficient utilization of carbon source in the A^2/OBCO process was the main reason to achieve deep denitrification and phosphorus removal under the condition of low C/N.In addition,through the correlation analysis of C/N with aeration rate,nitrate recycling ratio and anaerobic/anoxic reaction time,the optimal operation strategy of the A^2/O-BCO process was proposed.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2016年第5期1366-1375,共10页
China Environmental Science
基金
国家自然科学基金(51578014)
北京市教委资助项目
