流量分配对短程生物脱氮过程中N_2O产生的影响  

The impact of flow distribution on N_2O emission during short-cut biological nitrogen removal process

作　　者：巩有奎[1,2] 彭澄瑶[2] 王淑莹[2] 彭永臻[2] 

机构地区：[1]石家庄铁路职业技术学院,石家庄050041 [2]北京工业大学环境与能源工程学院,北京100022

出　　处：《环境科学学报》2014年第7期1668-1673,共6页Acta Scientiae Circumstantiae

基　　金：河北省高等学校科学技术研究青年基金(No.QN20131172);"十一五"国家科技支撑计划重点项目(No.2009BAC57B01-2);河北省科技厅科技支撑计划项目(No.12273611)~~

摘　　要：利用SBR反应器,通过在线pH曲线控制好氧-缺氧反应时间,成功实现了短程生物脱氮,并考察了分段进水条件下流量分配对SBR反应器运行性能及N2O产量的影响.结果表明,与原水分2次在不同阶段等量加入反应器的二段进水方式相比,原水分3次等量进入反应器的三段进水方式能够有效降低脱氮过程中外碳源投加量和氧化亚氮产量;氧化亚氮主要产生于硝化过程,反硝化过程能够将硝化阶段积累的N2O还原至N2.2次、3次等量进水条件下,生物短程脱氮过程中乙醇投加量分别为0.8和0.6 mL,N2O释放量分别为8.86和5.05 mg·L-1(以N计).硝化过程中NO-2-N的积累是导致系统N2O产生的主要原因.A step-feed sequencing batch reactor（ SBR） was proposed to make full use of the influent carbon source and reduce external carbon source addition. Through on-line pH control,two different step-feed modes were compared in terms of nitrogen removal efficiency and N2O emissions. Compared with two-equal influent flow mode,both the external carbon addition and N2O emission decreased in three-equal influent flow mode. It was found that most of the N2O was produced and emitted during nitrification process. For denitrification,the dissolved N2O accumulated during nitrification process could be reduced to N2provided that sufficient carbon source was added. The amount of ethanol addition for two-and three-equal influent flows were 0. 8mL and 0. 6 mL,respectively,while N2O emission decreased from 8. 86 mg·L-1to 5. 05 mg·L-1. The accumulation of nitrite during nitrification was a potentially key factor that resulted in N2O emission.

关 键 词：生活污水 短程生物脱氮 流量分配 N2O 好氧反硝化 

分 类 号：X703[环境科学与工程—环境工程]