Fenton氧化絮凝处理垃圾渗滤液中腐殖酸的研究

发布时间：2018-04-26 12:23

本文选题：Fenton + 氧化　；参考：《中国矿业大学》2015年硕士论文

【摘要】：本研究通过Fenton氧化絮凝处理垃圾渗滤液中腐殖酸开展了一系列的实验,主要分为三部分进行研究。第一部分,考察垃圾渗滤液腐殖酸的物化和凝聚沉降特性,结果表明:腐殖酸是一种复杂的有机物,主要由C和O元素组成,含有多种官能团,有羧基、酚基、芳香环等。2009年填埋的垃圾渗滤液中腐殖酸(简称09HA)中含有的酸性基团,羧基、酚羟基较2006年填埋的垃圾渗滤液中腐殖酸(简称06HA)的多,且它们结构不同,元素含量不同,分子量及粒度都不同。可见不同填埋时间下垃圾渗滤液中腐殖酸的复杂性。且用氯化铁和亚铁为絮凝剂处理两种腐殖酸时,对高浓度的腐殖酸絮凝沉降效果都差。考虑到实际的垃圾渗滤液情况,添加几种主要的组分进行试验,结果是氨氮对絮凝去除腐殖酸有一定的促进作用;碱度、EDTA、柠檬酸三钠抑制腐殖酸的去除,絮凝效果差。第二部分,通过Fenton氧化絮凝来考察对高浓度腐殖酸的处理效果,实验结果表明,(1)Fenton氧化絮凝处理腐殖酸的初步实验中,无论是低剂量亚铁还是高剂量亚铁,作用于两种腐殖酸的效果不同,COD的去除率和过氧化氢添加量相关。COD氧化(CODoxid)去除率随着过氧化氢的添加而增大,而COD絮凝(CODcoag)去除率则先增大后下降。09HA最佳COD去除率达到80%,TOC去除率达到60%;06HA的COD和TOC的去除率最大可达到83%。在Fenton处理中,09HA以氧化为主;06HA氧化降解难,主要是靠Fenton絮凝去除COD和TOC。(2)考察不同初始p H、亚铁和过氧化氢条件下,对两种腐殖酸的作用效果不同,实验结果表明:在初始p H=5的条件下,对于06HA在亚铁3 mmol/L,过氧化氢93.75 mmol/L时,COD和TOC去除率达到83%;对于09HA在亚铁5 mmol/L,过氧化氢93.75 mmol/L时,COD去除率80%,TOC去除率65%。(3)Fenton氧化特性实验:通过测定p H值、氧化还原电位(ORP)、溶解态铁离子和H2O2浓度等在Fenton反应中(初始Fe2+浓度=10~200 mmol/L)的变化,考察了葡萄糖、苯酚等对Fenton反应过程的影响,分析了生成的次生铁矿物。结果表明:初始Fe2+浓度≥50 mmol/L条件下的瞬时ORP和p H值随H2O2:Fe2+摩尔比的增加呈现逐渐增加到快速降低的变化过程。初始葡萄糖和苯酚浓度=4.17 mmol/L和初始葡萄糖浓度=8.33 mmol/L条件下的H2O2基本耗尽时间分别为约15 min,10 min,2 min;初始苯酚浓度=8.33 mmol/L和初始葡萄糖和苯酚浓度=16.66mmol/L条件下的Fe2+浓度至60 min末分别为7.40,27.40,58.83 mmol/L。初始p H=3.3条件下Fenton反应形成的次生铁矿物经X射线衍射(XRD)分析初步鉴定为施氏矿物,其中添加葡萄糖或苯酚Fenton反应生成的球形次生铁矿物其表面形成刺突。第三部分,考察了Fenton氧化絮凝腐殖酸的红外光谱和絮体分形维数变化,试验结果表明:通过红外光谱测定Fenton氧化絮凝反应的分析,可知Fenton氧化对腐殖酸的官能团及絮凝有一定的影响。絮体分形维数中,在低剂量的亚铁时,09HA的面积比06HA的大,维数大;高剂量亚铁时,没有回调p H为7时,絮凝06HA的比09HA的絮体大;而回调p H为7后,06HA和09HA的絮体都增大,维数增大。可见针对不同的腐殖酸Fenton氧化絮凝的效果不同。
[Abstract]:In this study, a series of experiments were carried out to treat humic acid in landfill leachate by Fenton oxidation flocculation. It was divided into three parts. The first part, the physicochemical and coagulation characteristics of humic acid in landfill leachate were investigated. The results show that humic acid is a complex machine, mainly composed of C and O elements, and contains a variety of functional energy. In the landfill leachate, such as carboxyl, phenolic base and aromatic ring, the acid group, carboxyl group and phenolic hydroxyl group in the landfill leachate (09HA) in.2009 years are more than the humic acid (06HA) in the landfill leachate in 2006, and their structure is different, the content of the elements is different, the molecular weight and the grain size are different. The humic acid in the leachate is complex. When two humic acids are treated with ferric chloride and ferrous as flocculant, the effect of flocculating and settling of high concentration humic acid is poor. Taking into account the actual landfill leachate condition, several main components are added to experiment. The result is that ammonia nitrogen has a certain promotion effect on flocculation and removal of humic acid; alkalinity, EDTA The three sodium citrate inhibits the removal of humic acid and the flocculation effect is poor. The second part, through Fenton oxidation flocculation, investigates the treatment effect of high concentration humic acid. The experimental results show that (1) Fenton oxidation flocculation treatment of humic acid in the preliminary experiment, whether low dose ferrous or high dose ferrous, effect on two kinds of humic acid effect is different The removal rate of COD removal and the addition of hydrogen peroxide (CODoxid) removal rate increases with the addition of hydrogen peroxide, while COD flocculation (CODcoag) removal rate increases first and then decreases.09HA, the best COD removal rate reaches 80%, TOC removal rate reaches 60%, 06HA's COD and TOC removal rate can reach 83%. in the treatment. Main: 06HA oxidation degradation is difficult, mainly by Fenton flocculation to remove COD and TOC. (2) to investigate different initial P H, ferrous and hydrogen peroxide, the effect of the two kinds of humic acid is different. Experimental results show that, under the initial P H=5 conditions, for 06HA in ferrous 3 mmol/L, hydrogen peroxide 93.75 mmol/L, COD and removal rate of 83%; for When A was 5 mmol/L and 93.75 mmol/L hydrogen peroxide, the removal rate of COD was 80%, and the TOC removal rate was 65%. (3) Fenton oxidation experiment. The changes of P H value, redox potential (ORP), dissolved iron ion and H2O2 concentration in the Fenton reaction were investigated. The results showed that the instantaneous ORP and P H value of the initial Fe2+ concentration increased to a rapid decrease with the increase of the H2O2:Fe2+ molar ratio. The initial glucose and phenol concentration =4.17 mmol/L and the initial glucose concentration =8.33 mmol/L were basically depleted when the initial concentration of the initial concentration was more than 50 mmol/L. About 15 min, 10 min, 2 min, respectively, the concentration of initial phenol concentration =8.33 mmol/L and the initial glucose and phenol concentration =16.66mmol/L conditions are 7.40,27.40,58.83 mmol/L. initial P H=3.3 conditions, respectively, under the initial P H=3.3 condition. The surface of the globular sub pig iron mineral formed by the reaction of glucose or phenol Fenton forms a spiny surface. The third part, the infrared spectrum and the fractal dimension change of the flocculation humic acid of Fenton are investigated. The experimental results show that the analysis of the oxidation flocculation reaction of Fenton by the infrared spectrum is used to determine the functional groups of the humic acid by the Fenton oxidation and the analysis of the functional groups of the humic acid. Flocculation has a certain influence. In the fractal dimension of floc, the area of 09HA is larger and larger than that of 06HA in low dose ferrous. When high dose ferrous metals, when the P H is 7, flocculation 06HA is larger than that of 09HA, and the floc of 06HA and 09HA increases and the dimension increases after the return of P H is 7. Therefore, the flocculation of different humic acids will be oxidized and flocculated. The effect is different.

【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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