| 低氧污泥丝状菌膨胀的呼吸图谱特征分析 |
| 摘要点击 1767 全文点击 771 投稿时间：2017-01-11 修订日期：2017-04-01 |
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| 中文关键词 低溶氧 丝状菌膨胀 呼吸图谱 比耗氧呼吸速率 亲和系数 |
| 英文关键词 low dissolved oxygen filamentous bulking respirogram specific oxygen uptake rate affinity coefficient |
| 作者 | 单位 | E-mail | | 马智博 | 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, 西安 710055 | fukuokaxa@qq.com | | 李志华 | 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, 西安 710055 | lizhihua@xauat.edu.cn | | 杨成建 | 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, 西安 710055 | | | 贺春博 | 挪威科技大学土木与环境工程系, 特隆赫姆 7050, 挪威 | | | 秋亮 | 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, 西安 710055 | | | 张晶 | 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, 西安 710055 | |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| The current research on filamentous bulking focuses on the effluent quality and the settling properties but the reports on the microbial physiology under filamentous bulking conditions are seldom. In this study, the variations in the respirogram of microorganisms and affinity coefficient during filamentous bulking were explored in a sequence batch reactor. Low dissolved oxygen, regarded as the typical reason for filamentous bulking, was applied as the stimulation method. The results showed that microorganisms entered the physiological adaptation stage in the early period of low DO. The following properties were observed in the system:① a sudden increase in the endogenous specific oxygen uptake rate (SOURe) of activated sludge, ② an abrupt decrease in the specific oxygen uptake rate (SOURn) of autotrophic bacteria, ③ a rapid increase after a slight decline in the specific oxygen uptake rate (SOURc) of heterotrophic bacteria and a sudden increase in the oxygen affinity coefficient (KO). However, maintaining the low DO levels would deteriorate the effluent quality and sedimentation properties, but the SOURn and SOURc could recover to higher levels after a while and the COD affinity coefficient (KS) and KO would decrease gradually. In low DO conditions, a sufficient hydraulic retention time will benefit the effluent quality from a theoretical point of view. Moreover, microorganisms could adapt to low DO conditions, which verifies the feasibility of "low oxygen aeration theory" from the respiration and kinetic parameters. The results from this study provide a theoretical support for energy savings of sewage treatment plant operations. |
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