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A2O工艺处理低C/N比生活污水的试验研究
引用本文:吴昌永,彭永臻,彭轶.A2O工艺处理低C/N比生活污水的试验研究[J].化工学报,2008,59(12):3126-3131.
作者姓名:吴昌永  彭永臻  彭轶
作者单位:哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江 哈尔滨 150090;北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京 100022 ;
基金项目:国家自然科学基金-海外青年学者合作研究基金,北京市教委科研基地-科技创新平台项目
摘    要:采用52.5 L的A2O试验装置处理实际生活污水,研究了A2O工艺在处理低C/N比生活污水时的脱氮除磷特性,并探讨了如何通过强化缺氧吸磷来提高系统的脱氮除磷效率。试验结果表明:在厌氧/缺氧/好氧体积比为1/1/2、HRT为8 h、污泥回流比为70%、内回流比为300%的工况下处理C/N为7.89的生活污水,TN和SOP去除率分别能够达到85.4%和93.3%,系统中存在反硝化除磷,缺氧吸磷占总吸磷量的25.3%。同样的运行条件下处理C/N为4.20的生活污水时,SOP去除几乎不受影响,但TN去除率降低至62.2%,平均出水TN浓度也超过20 mg•L-1。维持厌氧区体积不变,增大缺氧区体积,使得缺氧/好氧体积比为5/8时,TN去除率可上升到70.7%,缺氧吸磷占总吸磷量的55.2%。同时改变内回流比的试验表明250%的内回流比能最大程度地强化反硝化除磷的作用,此时TN去除率可提高至77.3%。强化A2O工艺中的反硝化除磷,能克服碳源不足对脱氮除磷的影响,显著提高低C/N比污水的脱氮除磷效率。

关 键 词:污水处理  脱氮除磷  反硝化除磷  A2O工艺  
收稿时间:2008-4-2
修稿时间:2008-9-12  

Biological nutrient removal in A2O process when treating low C/N ratio domestic wastewater
WU Changyong,PENG Yongzhen,PENG Yi.Biological nutrient removal in A2O process when treating low C/N ratio domestic wastewater[J].Journal of Chemical Industry and Engineering(China),2008,59(12):3126-3131.
Authors:WU Changyong  PENG Yongzhen  PENG Yi
Abstract:In order to investigate the performance of biological nutrients removal and denitrifying phosphorus removal in the A2O process when treating low C/N ratio domestic wastewater,a reactor,with a working volume of 52.5 L,was used in this study.The volume ratio of anaerobic/anoxic/aerobic zone was 1/1/2 and the major operating parameters were:HRT 8 h,sludge recycle ratio(r)70%,aerobic(nitrate)recycle ratio(R)300%.The results showed that 85.4% of TN and 93.3% of SOP could be removed when the C/N ratio was 7.89.There was denitrifying phosphorus removal in the system.Moreover,up to 25.3% of the SOP could be removed in the anoxic zone by this way.The TN removal efficiency was reduced to 62.2% when decreasing the C/N ratio to 4.20 with the same operating parameters.However,the SOP removal efficiency was kept over 96.0%.The TN removal efficiency was 70.7% and up to 55.2% of SOP was removed in the anoxic zone when changing the volume ratio of anoxic/aerobic to 5/8.With the same anoxic/aerobic ratio,when changing the aerobic(nitrate)recycle ratio to 250%,the maximal denitrifying phosphorus removal could be achieved,removing 77.3% of the TN from the system.Enhanced denitrifying phosphorus removal in the A2O process is an effective way to counteract the disadvantages of carbon shortage for biological nutrients removal.
Keywords:wastewater treatment  biological nutrients removal  denitrifying phosphorus removal  A2O process
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