不同污水处理工艺非二氧化碳温室气体的释放  

Non-CO_2 Greenhouse Gas Release from Different Biological Wastewater Treatment Processes

作　　者：李惠娟[1] 彭党聪[1] 刘文博[1] 姚倩[1] 卓杨[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境科学》2017年第4期1640-1646,共7页Environmental Science

基　　金：陕西省住房城乡科技开发项目(2015-K65)

摘　　要：甲烷和氧化亚氮是两种重要的非二氧化碳温室气体.城市污水处理厂是甲烷和氧化亚氮的重要释放源.因此,为探究不同污水处理工艺甲烷和氧化亚氮的释放现状和变化规律,通过浮流式表面集气罩对西安市第三污水处理厂(Orbal氧化沟工艺)和第四污水处理厂(A/A/O工艺)生物处理过程中甲烷和氧化亚氮的排放情况进行测定,比较不同污水处理工艺中非二氧化碳温室气体的释放情况,并以第四污水处理厂为例研究溶解氧、温度对非二氧化碳温室气体释放量的影响.结果表明,西安市第三污水处理厂每m^3进水释放甲烷1 181 mg(以CH_4计)、氧化亚氮36.20 mg(以N_2O计),西安市第四污水处理厂每m^3进水释放甲烷209 mg(以CH_4计)、氧化亚氮54.64 mg(以N_2O计).温度、曝气方式、溶解氧浓度、亚硝酸盐氧化速率和最大产甲烷活性是甲烷和氧化亚氮释放量的重要影响因素.Methane（CH_4） and nitrous oxide（N_2O） are two of the most important non-CO_2 greenhouse gases.And municipal sewage treatment plant is an important anthropogenic source of CH_4 and N_2O.Therefore,it is essential to measure the production and emission of CH_4 and N_2O during biological wastewater treatment process.The surface emission flux isolation chamber was employed to collect the gas sample from the Xi＇an No.3 WWTP（the Orbal oxidation ditch process） and Xi＇an NO.4 WWTP（A/A/O process） to determine the contents of methane and nitrous oxide.And the effects of temperature and dissolved oxygen concentration on non-CO_2 greenhouse gases emission from Xi＇an NO.4 WWTP were discussed.The results showed that methane and nitrous oxide emission factors from No.3WWTP were 1 181 mg CH_4 per m^3influent and 36.20 mg N_2O per m^3 influent,respectively while those from the No.4 WWTP were209 mg CH_4 per m^3influent and 54.64 mg N_2O per m^3 influent.In addition,the important influencing factors which affected methane and nitrous oxide emission were temperature,aeration strategy,DO,nitrite oxidation rate and specific methanogenic activity.

关 键 词：甲烷 氧化亚氮 A/A/O ORBAL氧化沟 污水生物处理 

分 类 号：X16[环境科学与工程—环境科学]