CAJ | 학술논문

总氮是城市污水处理的一项重要常规指标，在我国现有的城市污水处理工艺中，生化系统中影响脱氮效率的因素主要包括缺氧池容积负荷、混合液回流比、污泥龄和水温等。本研究通过中试试验发现，当缺氧池HRT大于3 hr （对应容积负荷0.24 kg TN· m-3· d-1）、混合液回流比大于150％、污泥龄不小于10 d、水温高于20℃时， A2/O可以将平均值为30 mg/L的TN去除到10 mg/L以下，去除率接近70％，稳定达到一级A标准。
총담시성시오수처리적일항중요상규지표，재아국현유적성시오수처리공예중，생화계통중영향탈담효솔적인소주요포괄결양지용적부하、혼합액회류비、오니령화수온등。본연구통과중시시험발현，당결양지HRT대우3 hr （대응용적부하0.24 kg TN· m-3· d-1）、혼합액회류비대우150％、오니령불소우10 d、수온고우20℃시， A2/O가이장평균치위30 mg/L적TN거제도10 mg/L이하，거제솔접근70％，은정체도일급A표준。
A pilot scale A 2 O system is used for investigating the main parameters which influence the removal of total nitro -gen.The results reveal that , to reduce the total nitrogen from 30 mg/L to less than 10 mg/L which can meet the first-class A permit-ted criteria of municipal wastewater treatment plants , the volume load of the anoxic pond should be larger than 3 hr( corresponding volumetric loading of 0.24 kg TN· m-3 · d-1 ), the reflux ratio of the mixed liquid should exceed 150%, the sludge age should not less than 10 d and the water temperature should be higher than 20℃.The results can be applied to the removal of the total nitrogen in municipal wastewater treatment plant .