苯酚和喹啉同时生物降解过程中对氧和电子的竞争
发布时间：2018-08-17 17:49
【摘要】：目前,由于社会经济的迅速发展,在日常生产和生活中存在着难以生物降解并对生态环境有毒害作用的各种有机化合物。这些物质具有长期存留、污染范围广等特点,一旦进入自然环境,对生态环境和人体健康构成了严重的威胁。本研究选取其中具有代表性的有毒难降解有机污染物:苯酚和喹啉。苯酚是现代化学工业中常用的生产原料,由于苯酚具有活泼的化学性质和稳定的苯环结构,苯酚污染物已经成为环境中残留的难降解、有毒和有害污染物质的代表。喹啉是一种典型的含氮杂环化合物,其分子结构是由一个苯环和一个吡啶环耦合而成,是一种芳香族化合物。喹啉具有生物毒性,对动植物体会起到不同程度的毒害作用,如果进入人体,会导致“三致”——致畸、致癌、致突变作用。而随着喹啉这种化工原料的广泛使用,许多地区的土壤、地表水和地下水中都检测到了喹啉的存在。因此,含酚废水和含喹啉废水的处理方法和相关学术研究日益受到关注。本研究利用一种新型的垂流式挡板生物膜反应器(vertical baffled bioreactor,简称VBBR)分别对苯酚和喹啉进行生物降解,重点讨论了溶解氧和电子在其生物降解过程中的加速作用。通过Monod和Aiba两种动力学模型探讨了电子是如何加速苯酚和喹啉生物降解速率的。主要实验结果如下:1.在30℃,pH=7.0,DO值为5.0-6.0 mg/L条件下,在苯酚生物降解过程中,检测到有邻苯二酚的产生;在喹啉的生物降解过程中,检测到有2-羟基喹啉的产生。其中,苯酚的中间产物仅在苯酚与喹啉同时生物降解时检测到其产生;而在喹啉单独生物降解以及与苯酚同时生物降解过程中均检测到喹啉中间产物的产生。2.溶解氧和电子是苯酚、喹啉生物降解的主要限制因素,在30℃,pH=7.0,DO值为5.0-6.0 mg/L条件下,添加不同浓度的外源电子供体对苯酚、喹啉生物降解速率有促进作用,两者成正比关系;当设置不同浓度的溶解氧,对苯酚、喹啉的生物降解速率有不同程度的促进作用,在溶解氧浓度在0-6.0 mg/L范围内,两种有机物的生物降解速率随着反应体系中溶解氧浓度的增大而增大。3.对苯酚、喹啉单独生物降解分别进行动力学研究,当单独生物降解时,苯酚、喹啉生物降解均符合Monod动力学模型,当同时生物降解时,苯酚、喹啉均符合Aiba动力学模型,通过动力学研究为电子对生物降解的加速作用提供了科学解释。
[Abstract]:At present, due to the rapid development of social economy, there are various organic compounds which are difficult to biodegrade and toxic to the ecological environment in daily production and daily life. These substances have the characteristics of long-term existence and wide range of pollution. Once they enter the natural environment, they pose a serious threat to the ecological environment and human health. In this study, phenol and quinoline were selected as the representative toxic and refractory organic pollutants. Phenol is a common raw material in modern chemical industry. Because of its active chemical properties and stable benzene ring structure, phenol pollutant has become the representative of environmental residual refractory, toxic and harmful pollutants. Quinoline is a typical nitrogen-containing heterocyclic compound. Its molecular structure is composed of a benzene ring and a pyridine ring, which is an aromatic compound. Quinoline has biological toxicity and plays a different degree of toxicity to animal and plant experience. If it enters the human body, it will lead to "three causes"-teratogenicity, carcinogenesis, mutagenicity. With the widespread use of quinoline, quinoline was detected in soil, surface water and groundwater in many areas. Therefore, phenol-containing wastewater and quinoline-containing wastewater treatment methods and related academic research has been paid more and more attention. In this paper, a novel vertical baffle biofilm reactor (VBBR) was used to biodegrade phenol and quinoline respectively, and the accelerated effects of dissolved oxygen and electrons in the process of biodegradation were discussed. Two kinetic models, Monod and Aiba, were used to investigate how electrons accelerate the biodegradation rate of phenol and quinoline. The main experimental results are as follows: 1. Catechol and 2-hydroxyquinoline were detected during phenol biodegradation and quinoline biodegradation at 30 鈩，
本文编号：2188415
[Abstract]:At present, due to the rapid development of social economy, there are various organic compounds which are difficult to biodegrade and toxic to the ecological environment in daily production and daily life. These substances have the characteristics of long-term existence and wide range of pollution. Once they enter the natural environment, they pose a serious threat to the ecological environment and human health. In this study, phenol and quinoline were selected as the representative toxic and refractory organic pollutants. Phenol is a common raw material in modern chemical industry. Because of its active chemical properties and stable benzene ring structure, phenol pollutant has become the representative of environmental residual refractory, toxic and harmful pollutants. Quinoline is a typical nitrogen-containing heterocyclic compound. Its molecular structure is composed of a benzene ring and a pyridine ring, which is an aromatic compound. Quinoline has biological toxicity and plays a different degree of toxicity to animal and plant experience. If it enters the human body, it will lead to "three causes"-teratogenicity, carcinogenesis, mutagenicity. With the widespread use of quinoline, quinoline was detected in soil, surface water and groundwater in many areas. Therefore, phenol-containing wastewater and quinoline-containing wastewater treatment methods and related academic research has been paid more and more attention. In this paper, a novel vertical baffle biofilm reactor (VBBR) was used to biodegrade phenol and quinoline respectively, and the accelerated effects of dissolved oxygen and electrons in the process of biodegradation were discussed. Two kinetic models, Monod and Aiba, were used to investigate how electrons accelerate the biodegradation rate of phenol and quinoline. The main experimental results are as follows: 1. Catechol and 2-hydroxyquinoline were detected during phenol biodegradation and quinoline biodegradation at 30 鈩，
本文编号：2188415
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