低氧污泥丝状菌膨胀的呼吸图谱特征分析
发布时间：2019-04-11 17:08
【摘要】：目前对污泥丝状菌膨胀的研究主要关注出水水质和沉降性等特征,而鲜有关于活性污泥微生物生理状态的报道.针对这一问题,采用降低SBR系统中溶解氧(DO)这一引发污泥丝状菌膨胀的典型条件,研究了污泥丝状菌膨胀过程中微生物受冲击过程中呼吸图谱与亲和系数的变化.结果表明,降低DO初期,微生物进入生理适应期,其特征为活性污泥内源比耗氧呼吸速率(SOURe)突然上升,自养菌比耗氧呼吸速率(SOURn)大幅下降,异养菌比耗氧呼吸速率(SOURc)小幅下降后迅速上升,同时氧亲和系数KO突增;维持低DO时期特征为出水水质和沉降性恶化,但SOURn和SOURc均恢复至较高水平,且COD亲和系数KS和氧亲和系数KO逐步减小,从理论上证明了低DO环境下足够的水力停留时间可以使出水水质更好,也就说明微生物通过适应性调整可以适应低DO环境,从呼吸代谢和动力学参数的角度验证了"低氧曝气理论"的可行性.研究成果对于污水处理厂节能提供新的理论支持.
[Abstract]:At present, the research on the expansion of the filamentous bacteria of the sludge mainly focuses on the characteristics of water quality and sedimentation, but few reports about the physiological state of the activated sludge. In order to solve this problem, a typical condition of reducing the amount of dissolved oxygen (DO) in the SBR system is used to expand the filamentous bacteria of the sludge, and the change of the respiration pattern and the affinity coefficient during the expansion of the filamentous fungus of the sludge is studied. The results showed that, in the early stage of DO, the microorganisms enter the physiological period, which is characterized by a sudden increase of the endogenous specific oxygen-consumption respiration rate (SOURe) of the activated sludge, a significant decrease in the respiration rate of the autotrophic bacteria (SOURn) and a rapid rise in the rate of respiration of the heterotrophic bacteria (SOURc) after a small decrease in the oxygen-consuming respiration rate (SOURc), at the same time, the oxygen affinity coefficient KO is increased; the low DO period is maintained to be characterized in that the water quality and the sedimentation property of the effluent are deteriorated, but both the SOURCE and the SOURc are recovered to a higher level, and the COD affinity coefficient KS and the oxygen affinity coefficient KO are gradually reduced, It is proved theoretically that sufficient hydraulic retention time in the low DO environment can make the water quality better, and the feasibility of the "low-oxygen aeration theory" is verified from the angle of the respiratory metabolism and the kinetic parameters. The research results provide new theoretical support for the energy-saving of the sewage treatment plant.
【作者单位】： 西安建筑科技大学环境与市政工程学院西北水资源与环境生态教育部重点实验室;挪威科技大学土木与环境工程系;
【基金】：陕西省住房和城乡建设厅科技计划项目(2015-K63) 西安市社会发展引导计划-社会发展科技示范项目(2016063SF/SF09)
【分类号】：X172
本文编号：2456601
[Abstract]:At present, the research on the expansion of the filamentous bacteria of the sludge mainly focuses on the characteristics of water quality and sedimentation, but few reports about the physiological state of the activated sludge. In order to solve this problem, a typical condition of reducing the amount of dissolved oxygen (DO) in the SBR system is used to expand the filamentous bacteria of the sludge, and the change of the respiration pattern and the affinity coefficient during the expansion of the filamentous fungus of the sludge is studied. The results showed that, in the early stage of DO, the microorganisms enter the physiological period, which is characterized by a sudden increase of the endogenous specific oxygen-consumption respiration rate (SOURe) of the activated sludge, a significant decrease in the respiration rate of the autotrophic bacteria (SOURn) and a rapid rise in the rate of respiration of the heterotrophic bacteria (SOURc) after a small decrease in the oxygen-consuming respiration rate (SOURc), at the same time, the oxygen affinity coefficient KO is increased; the low DO period is maintained to be characterized in that the water quality and the sedimentation property of the effluent are deteriorated, but both the SOURCE and the SOURc are recovered to a higher level, and the COD affinity coefficient KS and the oxygen affinity coefficient KO are gradually reduced, It is proved theoretically that sufficient hydraulic retention time in the low DO environment can make the water quality better, and the feasibility of the "low-oxygen aeration theory" is verified from the angle of the respiratory metabolism and the kinetic parameters. The research results provide new theoretical support for the energy-saving of the sewage treatment plant.
【作者单位】： 西安建筑科技大学环境与市政工程学院西北水资源与环境生态教育部重点实验室;挪威科技大学土木与环境工程系;
【基金】：陕西省住房和城乡建设厅科技计划项目(2015-K63) 西安市社会发展引导计划-社会发展科技示范项目(2016063SF/SF09)
【分类号】：X172
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