生物电化学强化对印染废水厌氧生物处理的影响研究

发布时间：2018-01-06 18:27

  本文关键词：生物电化学强化对印染废水厌氧生物处理的影响研究　出处：《武汉纺织大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 活性艳红X-3B EGSB反应器 纳米零价铁 生物电化学 脱色

【摘要】：印染废水含有多种难降解有机污染物,是具有高化学需氧量(COD)、高色度、“三致”毒性的难降解有机废水。印染废水大量流入我国水体环境,已经成为威胁我国水环境安全的重要因素之一。生物处理法是实现染料废水处理的有效技术之一。膨胀颗粒污泥床(EGSB)是目前很有发展前景的一种“高速”厌氧生物反应器。纳米零价铁(nZVI)不仅可高效还原转化污染物,其腐蚀产H2过程还可作为厌氧微生物电子供体,从而偶联生物降解。本论文首先进行了EGSB反应器的启动工作,将葡萄糖、尿素、磷酸二氢钾按质量比100:5:1配制成营养液,以驯化EGSB反应器中的厌氧污泥,经90d后系统稳定运行,EGSB反应器的COD降解率保持在90%以上;接着分别开展了两种生物电化学强化厌氧生物处理的研究:(1)采用纳米零价铁(nZVI)-EGSB反应器耦合处理印染废水,以活性艳红X-3B溶液模拟印染废水,单独nZVI和单独EGSB作为空白对照,考察了不同nZVI浓度、pH、初始X-3B浓度、温度等条件对该耦合体系处理效果的影响。试验结果表明:nZVI-EGSB耦合体系能有效去除印染废水的色度,在染料X-3B初始浓度为100mg/L,nZVI投加量为0.5g/L,pH6.0,30℃的条件下,48h以内去除率可达98.93%。该耦合体系脱色效果明显高于单独nZVI或单独EGSB反应器处理效果。(2)nZVI活化过硫酸钾(PS)系统与EGSB反应器联合处理印染废水,以活性艳红X-3B溶液模拟印染废水,考察了不同nZVI浓度对脱色率的影响,nZVI-PS体系作为对照。试验结果表明:nZVI浓度为0.2g/L时,nZVI-PS体系在60min的脱色率为96.68%;nZVI-PS-EGSB三者联合体系的脱色率可达99.38%。nZVI-PS-厌氧微生物三者联合体系的处理效果明显优于nZVI-PS联合体系。(3)针对EGSB反应器进行了初步的反应机制研究,取稳定运行的EGSB反应器中已驯化好的污泥,通过平板划线分离法,筛选出三种优势菌株,分别对其进行了分子生物学鉴定、生长曲线绘制、降解染料X-3B能力和nZVI-单种菌体处理染料X-3B效果的研究。
[Abstract]:Printing and dyeing wastewater contains a variety of refractory organic pollutants. It is a refractory organic wastewater with high chemical oxygen demand (COD), high chromaticity and "three toxicity". The printing and dyeing wastewater flows into the water environment of our country in large quantities. Biological treatment is one of the effective technologies for dye wastewater treatment. Expanded granular sludge bed (EGSBB) has become one of the most important factors that threaten the safety of water environment in China. It is a kind of "high speed" anaerobic bioreactor with good prospect at present. Nanometer zero-valent iron (NZVI) can not only reduce and convert pollutants efficiently. It can also be used as an electronic donor of anaerobic microorganism to couple biodegradation. In this paper, the start-up of EGSB reactor was first carried out, glucose and urea were added into the reactor. Potassium dihydrogen phosphate was prepared into nutrient solution by mass ratio of 100: 5: 1 to acclimatize anaerobic sludge in EGSB reactor. After 90 days, the system operated stably. The COD degradation rate of EGSB reactor was kept above 90%. Then, two kinds of bioelectrochemical enhanced anaerobic biological treatment were carried out respectively. (1) Nano-zero-valent iron nZVII-EGSB reactor was used to treat printing and dyeing wastewater. The reactive brilliant red X-3B solution was used to simulate printing and dyeing wastewater. NZVI and EGSB were used as blank control. The pH and initial X-3B concentration of nZVI were investigated. The effect of temperature and other conditions on the treatment effect of the coupling system was studied. The experimental results show that the coupling system of 1: nZVI-EGSB can effectively remove the chroma of printing and dyeing wastewater. The initial concentration of dye X-3B is 100 mg / L ~ (-1) L ~ (-1) ZVI = 0.5 g 路L ~ (-1) L ~ (-1) (pH = 6.0 ~ (30) 鈩，

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