SMSBR处理焦化废水中的短程硝化反硝化 .docx

工程建筑学相关资料ENGINEERING ARCHITECTURE RELATED INFORMATION 工程建筑学相关资料 ENGINEERING ARCHITECTURE RELATED INFORMATION PAGE PAGE 1 SMSBR处理焦化废水中的短程硝化反硝化  摘要：采用一体化膜—序批式生物反应器(Submerged Membrane Sequencing Batch Reactor，简称SMSBR)处理焦化废水的过程中获得了稳定、高效的短程硝化作用，平均亚硝化率(NO2-N/ NOX-N)为91.1%，并通过试验证实了这是由于泥龄太长所产生的微生物代谢产物抑制了硝化反应过程中的硝酸盐细菌的结果。在试验运行初期，由于泥龄短使微生物代谢产物未得到充分积累，硝化过程进行得非常彻底；然后在高效短程硝化的基础上进行反硝化，当反硝化负荷＜0.174kgNOX-N/(kgSS·d)、HRT＞8.44 h时，可实现81.34%的反硝化率，此时外加碳源的COD∶N为2.1∶1。 关键词：SMSBR 焦化废水 短程硝化反硝化 　Study on the Short-cut Nitrification and Denitrification in Coke Plant Wastewater Treatment by Using Submerged Membrane Sequencing Batch ReactorAbstract：The short-cut nitrification can be attained efficiently and steadily in coke plant wastewater treatment by using submerged membrane sequencing batch reactor (SMSBR)，with an average nitrosation rate (NO2-N/NOx-N) of 91.1%.The experimental results show that long SRT has resulted in the inhibition of nitrate bacteria caused by the metabolic products of microorganism.In the initial stage of experiment，　the metabolic products are not adequately accumulated due to short SRT and nitrification is carried out in a complete way.And then denitrification occurs based on the efficient and short-cut nitrification.When denitrification loading is＜0.174 kg NOx-N/(kgSS·d) and HRT＞8.44 h，denitrification rate of　 81.34% can be achieved，with external carbon COD∶N=2.1∶1.Keywords:　SMSBR;coke plant wastewater;short-cut nitrification and denitrification　　短程硝化—反硝化(Shortcut nitrification and denitrification)是指将硝化控制在形成亚硝酸盐阶段，然后进行亚硝酸盐的反硝化。该脱氮工艺可节省供氧量约25%；可节省反硝化所需碳源的40%，在C/N值一定的情况下可提高TN的去除率；可减少50%的污泥生成量，也减少了投碱量；缩短了反应时间，相应地减少了反应器容积。　　短程硝化的标志是获得稳定高效的HNO2的积累，即亚硝酸化率(NO2-N/NOX-N)＞50%。荷兰Delft技术大学开发的SHARON工艺，利用在较高温度(30～35 ℃)下硝酸盐细菌的生长速率明显低于亚硝酸盐细菌的特点，在完全混合反应器中通过控制温度和停留时间，将硝化菌从反应器中洗脱，使反应器中亚硝化细菌占绝对优势，从而使氨氧化控制在亚硝酸盐阶段［1］。　　目前膜生物反应器(MBR)脱氮工艺形式多是建立在传统硝化—反硝化机理之上的两级或单级脱氮工艺，短程硝化反硝化现象在MBR工艺中体现得较少，Wouter Ghyoot［2］和W.J.Ng［3］在各自的MBR研究中都发现有一定程度的NO2-N积累(出水NO2-N/NOX-N＞50%)的现象，并对此进行了解释，但不够理想。笔者在