| 碳氮比及HRTS对交替缺氧/好氧CAST去除营养物的影响 |
| 摘要点击 3108 全文点击 1280 投稿时间：2009-12-15 修订日期：2010-03-11 |
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| 中文关键词 COD/TN比 HRTS 交替A/O 脱氮除磷 CAST |
| 英文关键词 COD/TN ratio HRTS alternating anoxic/oxic biological nutrients removal CAST |
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| 中文摘要 |
| 以实际生活污水为处理对象，分别研究了碳氮比（COD/TN）为2.6、3.5及4.4时，HRTS（选择器水力停留时间）对交替缺氧/好氧(A/O)CAST工艺去除营养物性能的影响.结果表明，采用交替A/O运行方式，进水COD/TN比及HRTS的变化对COD去除性能影响不明显；而对脱氮性能影响较大.当进水COD/TN比分别为2.6和3.5时，系统氨氮去除率均维持在98%以上，TN去除率则随HRTS的增大而升高；HRTS由1.8 h增至5 h时，2种碳氮比下的TN去除率分别由62.9%、 72.1%升至76.2%、 84.6%.当进水COD/TN比为4.4时， HRTS由1.8 h增至5 h导致系统硝化不完全，TN去除率由86.3%降至58.2%.研究还发现，提高COD/TN比和增大HRTS均能改善系统的除磷性能.本研究中交替A/O运行方式下，进水COD/TN比为4.4（远低于一般城市生活污水的8～10），HRTS为1.8 h时， CAST工艺获得较好的脱氮除磷效果，TN及磷的去除率分别为86.3%和93.8%，出水达到我国城镇污水处理厂污染物排放标准（GB 18918-2002）一级A要求. |
| 英文摘要 |
| The effects of different COD/TN and HRTS (hydraulic retention time of select) on nutrients removal were investigated by using an alternating anoxic/oxic CAST (cyclic activated sludge technology) fed with municipal wastewater. The results showed that various COD/TN and HRTS had a bigger influence on the nitrogen removal efficiency rather than the COD removal efficiency. As the influent C/N ratios were about 2.6 and 3.5, ammonia was removed by 98% and TN removal efficiency was increased from 62.9% to 76.2% and 72.1% to 84.6%, respectively, by increasing the HRTS from 1.8 h to 5 h. When the COD/TN ratio was increased to about 4.4, TN removal efficiency was decreased from 86.3% to 58.2% by enlarging the HRTS, which was due to the incomplete nitrification of ammonia. It was also observed that both of increasing the COD/TN and HRTS could improve the phosphorus removal performance of the system. Furthermore, effluent of CAST reached the demanded A of integrated wastewater discharge standards (GB 18918-2002) when the COD/TN and HRTS were 4.4 and 1.8 h, respectively. |
