硫酸根对缺氧脱氮影响的研究

发布时间：2018-05-20 07:35

本文选题：硫酸根 + A~2/O工艺　；参考：《河南工业大学》2017年硕士论文

【摘要】：A~2/O工艺是由Marais和Rabinowitz提出的,并率先在欧洲运行,且脱氮效果良好,随后被引入国内。但是该工艺在国内运行很难达到与欧洲相同的运行效果。调查欧洲以及国内废水中各物质的含量发现:欧洲生活污水水质中硫酸根含量普遍较高,而国内生活污水水质中硫酸根含量普遍较低。受地域以及季节的影响,硫酸根的含量差异很大,国内A~2/O工艺运行效果不佳可能与进水硫酸根含量偏低有关。本文通过在实验室建立A~2/O实验装置,连续运行模拟污水处理厂开放的水处理环境,力争达到与污水处理厂一样的处理效果。配制不同浓度的硫酸根废水,研究硫酸根浓度与总氮去除率之间是否存在相关性。通过研究本课题,论证A~2/O工艺中硫酸根对于总氮去除的影响,丰富A~2/O脱氮过程的影响因素,即适宜高浓度的进水硫酸根会使A~2/O工艺总氮的去除率得到提高。间接证明为什么A~2/O工艺在欧洲的运行效果比国内要好。本研究也对A~2/O工艺好氧池低氧条件下运行的脱氮处理过程中可能存在的机理进行了探索研究,包括可能存在的硫酸盐型厌氧氨氧化作用、同步脱硫反硝化等。通过大量的实验研究,我们论证了A~2/O工艺厌氧池是否存在SO42-和NH4+的反应。硫酸根在厌氧条件下氧化氨态氮,自身被还原为低价硫化物。而低价硫化物则伴随污泥一起进入后续的反硝化单元,作为电子供体,完成后期的脱氮。硫酸根每氧化1kg的氨氮,可以净产生1.71kg的COD。这意味着硫酸盐型厌氧氨氧化过程可以提供多余的碳源供给后续的反硝化单元,有助于解决生活污水处理过程中常见的碳源不足问题。中国乃至世界绝大多数地区都面临着缺乏碳源而导致总氮超标继而出现湖泊水库的富营养化问题,此反应的研究无疑具有重要意义。综上所述,本研究围绕硫酸根浓度对A~2/O工艺脱氮处理的影响,并对硫酸根参与下A~2/O工艺脱氮机理问题开展研究。证实了生活污水也可能发生硫酸盐型厌氧氨氧化,研究结果表明适宜浓度的硫酸根离子能够够提高A~2/O工艺去除总氮的能力,为后期进一步开发利用奠定了基础。
[Abstract]:An 2 / O process was proposed by Marais and Rabinowitz and was first run in Europe with good denitrification effect and then introduced into China. However, it is difficult to achieve the same operation effect as Europe in domestic operation. It is found that the content of sulphate in European domestic wastewater is higher than that in domestic wastewater, but it is generally low in domestic wastewater. Due to the influence of region and season, the content of sulphate is very different, and the low content of sulphate in influent may be related to the poor operation effect of A2 / O process in China. In this paper, through the establishment of an A2 / O experimental device in the laboratory, continuous operation of simulated wastewater treatment plant open water treatment environment, and strive to achieve the same treatment effect as sewage treatment plant. The correlation between sulfate concentration and total nitrogen removal rate was studied. By studying this topic, the effect of sulphate on total nitrogen removal in An 2 / O process is demonstrated, and the factors affecting the nitrogen removal process are enriched. That is, the removal rate of total nitrogen in An 2 / O process can be improved by suitable high concentration of influent sulfate radical. Indirectly, the A2 / O process works better in Europe than at home. The possible mechanism of denitrification in aerobic tank under low oxygen condition was also studied, including the possible sulphate anaerobic ammonia oxidation and simultaneous desulfurization and denitrification. Through a large number of experimental studies, we have demonstrated whether there is a reaction between so _ 4 _ 2- and NH4 in the anaerobic tank of An _ 2 / O process. Sulfate oxidizes ammonia nitrogen under anaerobic conditions and is reduced to low-valent sulfides. Low-valent sulfides enter the subsequent denitrification unit along with the sludge and act as an electronic donor to complete later denitrification. Each time the sulfate radical oxidizes the ammonia nitrogen of 1kg, the COD of 1.71kg can be produced net. This means that the sulfate-type anaerobic ammonia oxidation process can provide excess carbon sources for subsequent denitrification units and help to solve the problem of inadequate carbon sources in the treatment of domestic sewage. Most areas in China and even the world are faced with the problem of eutrophication of lakes and reservoirs due to the lack of carbon sources. The study of this reaction is undoubtedly of great significance. To sum up, the effect of sulfate concentration on denitrification of An _ 2 / O process and the mechanism of denitrification of An _ 2 / O process with the participation of sulphate were studied in this study. It is confirmed that sulphate anammoxidation may also occur in domestic sewage. The results show that the suitable concentration of sulfate ion can improve the ability of removing total nitrogen in An 2 / O process, which lays a foundation for further development and utilization in the later stage.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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