摘要
在(25~28℃)下,接种成熟亚硝化颗粒污泥于连续流反应器,为避免通过蠕动泵的污泥回流所造成的颗粒污泥破碎,采用内置沉淀区进行内回流,调整停曝比为1∶1、2∶1和1∶2,研究不同停曝比对连续流亚硝化颗粒污泥系统稳定性的影响.结果表明,控制停曝比为1∶1和2∶1,亚硝化性能良好,阶段末期亚硝酸盐积累率分别为85.2%和94.5%,控制停曝比为1∶2,亚硝化性能逐渐恶化,阶段末期氨氧化率和亚硝酸盐积累率下降至64.1%和58.7%.批次试验表明,间歇曝气相对连续曝气可在一定程度上较好地抑制亚硝酸盐氧化菌(NOB)的相对活性,停曝时间越长,对NOB的活性抑制越好,但由于停曝时间过长也将导致氨氧化率降低,故在亚硝化工艺中,可采用1∶1停曝比并协同其他控制条件的方式来实现连续流亚硝化工艺的长期稳定运行.污泥性能分析表明,在停曝比为1∶1~1∶2范围内,停曝时间越长,颗粒污泥结构越稳定,停曝时间越短,反应器内选择压较小,致使污泥沉降性能变差,部分亚硝化颗粒污泥解体,此外,胞外聚合物(EPS)化学分析及三维荧光光谱分析显示,停曝比为2∶1条件下,蛋白(PN)含量较高且蛋白/多糖(PN/PS)值也较高.
A continuous flow reactor was inoculated at 25-28℃with mature partial nitrification granular sludge.In order to avoid the granular sludge being crushed because of the sludge backflow through the peristaltic pump,a built-in sedimentation zone was used for internal backflow.The experiment investigated the influence of the different anaerobic time to aeration time ratio(1∶1,2∶1,and 1∶2)on the stability of a continuous-flow partial nitrification granular sludge system.The results showed that when the controlled anaerobic time to aeration time ratio was 1∶1 and 2∶1,the partial nitrification performance was good and the nitrite accumulation rates were 85.2%and 94.5%,respectively.When the controlled anaerobic time to aeration time ratio was 1∶2,the partial nitrification performance gradually deteriorated,and the ammonia nitrogen removal rate and nitrite accumulation rate at the end of the stage decreased to 64.1%and 58.7%,respectively.Batch test results showed that intermittent aeration and continuous aeration can better inhibit the relative activity of NOB in the partial nitrification system to a certain extent.The longer the anaerobic time,the better the NOB activity inhibition.However,too long an anaerobic time will also lead to ammonia nitrogen removal rate.In the process of partial nitrification,the long-term stable operation of continuous flow partial nitrification process can be realized by 1∶1 and coordinated control of other control conditions.An analysis of sludge performance indicated that in the anaerobic time to aeration time ratio range of 1∶1-1∶2,the longer the anaerobic time,the more stable the granular sludge structure.The shorter the anaerobic time,the smaller the selection pressure in the reactor,resulting in poor sludge sedimentation performance and partial disintegration of partial nitrification granular sludge.An EPS chemical analysis and a three-dimensional fluorescence spectroscopic analysis showed that the PN content was higher and the PN/PS value was higher when the anaerobic time and aeration time ratio was 2∶1.
作者
张杰
劳会妹
李冬
魏子清
ZHANG Jie;LAO Hui-mei;LI Dong;WEI Zi-qing(Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第11期5097-5105,共9页
Environmental Science
基金
北京高校卓越青年科学家计划项目(BJJWZYJH01201910005019)。
关键词
亚硝化颗粒污泥
连续流
停曝比
亚硝酸盐积累率
蛋白/多糖(PN/PS)
partial nitrification granular sludge
continuous-flow
anaerobic time to aeration time ratio
nitrite accumulation rate
PN/PS
