摘要
氨氮是厌氧氨氧菌主要基质之一,但常常因浓度过高而产生脱氮速率不稳定,甚至微生物活性抑制的现象.为了有效避免氨氮对厌氧氨氧化菌活性的抑制,从抑制物形态、主要影响因素和抑制规律探讨了氨氮对厌氧氨氧化菌活性的影响及调控.结果表明,温度、p H值变化对氨氮、游离氨的形态及浓度变化产生重要影响.在恒定进水氨氮浓度500mg/L的情况下,将抑制状态下的p H值从7.9下降到7.3,经过44h运行厌氧氨氧化菌活性获得恢复.在不同进水氨氮浓度下,FA对厌氧氨氧菌活性的半抑制浓度不一样.半抑制浓度与抑制时间存在一定的曲线关系(y=732.38x^(-0.89)).因此,恒定氨氮浓度的条件下,可以通过改变p H值避免FA对厌氧氨氧化菌活性的影响.在不同进水氨氮浓度下,除了考虑降低p H值,还可以通过缩短HRT来避免FA对厌氧氨氧化菌活性的影响.
NH4+-N was one of the important substrate for ANAMMOX bacteria.But instable nitrogen removal processoften occurred and microbial activity even had inhibited by using ANAMMOX bacteria,because of high substrateconcentration.In order to effectively avoid NH4+-N inhibition to anammox bacteria activity,the effect of NH4+-N on theactivity of anammox bacteria was analysis by inhibitor morphology,main influence factors and inhibiting regularity.Theresults showed that temperature and pH were important impact on morphology and concentration changes betweenNH4+-N and FA.The ANAMMOX activity was recovered after44h operation when the pH was decreased from7.9to7.3under the influent concentration of NH4+-N was fixed at500mg/L.Half maximal inhibitory concentration(IC50)of FAon ANAMMOX was different when the influent concentration of NH4+-N was variety.IC50of FA and inhibitory timeunder different NH4+-N concentrations have relationship(y=732.38x-0.89).Thus,we avoided the effect of FA on activity ofanammox bacteria by changing the pH when the influent concentration of NH4+-N was constant.Besides pH decreased,HRT can also be shortened to avoid the effect of FA on activity of ANAMMOX bacteria,when the influent concentrationof NH4+-N was fluctuate.
作者
袁砚
周正
林兴
王凡
李祥
顾澄伟
朱亮
YUAN Yan;ZHOU Zheng;LIN Xin;WANG Fan;LI Xiang;GU Chen-wei;ZHU Liang(School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 2150l1, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第9期3309-3314,共6页
China Environmental Science
基金
国家重点研发计划(2016YFC0401103)
国家自然科学基金项目(51478284
51408387)
江苏省特色优势学科二期项目
江苏省水处理技术与材料协同创新中心项目
苏州市分离净化材料与技术重点实验室(SZS201512)
关键词
厌氧氨氧化
游离氨
半抑制浓度
控制策略
Anammox
free ammonium
half maximal inhibitory concentration
control Strategy
作者简介
袁 砚(1983-),女,四川泸州人,硕士,实验师,主要研究方向为废水脱氮处理理论及新工艺.发表论文10余篇;责任作者, 实验师, lixiang@mail.usts.edu.cn
