木薯燃料乙醇生产废水厌氧氨氧化工艺研究
发布时间：2018-09-13 15:23
【摘要】：传统方法处理木薯燃料乙醇生产废水后,仍有大量高浓度的高氮低碳废水未能得到妥善处理,严重影响到我国的水环境,越来越高的水质排放标准也对污水脱氮工艺提出了新要求。厌氧氨氧化作为一种高效节能的新型自养生物脱氮工艺,具有无需外加碳源、污泥产量低等优点,实现了氨氮的最短途径转化。通过研究以期对天冠集团废水厌氧氨氧化反应器的工程实践应用作出有益的改进。研究对比了好氧硝化污泥和厌氧消化污泥不同接种比例下,氨态氮、亚硝态氮和硝态氮浓度和去除率的变化,筛选出厌氧氨氧化污泥菌种的最佳富集方式。采用UASB反应器,处理天冠集团木薯燃料乙醇生产废水,选择和控制适合厌氧氨氧化菌生长的有利条件,寻求最佳的调控因素和运行参数,实现低C/N比废水的经济高效处理,完成废水厌氧氨氧化处理工艺改进。并通过调节进水的pH值和反应温度,解析氨氮浓度与pH值、反应温度和运行时间之间的作用规律。研究结果表明：1.在模拟的ASBR反应器中接种不同比例的厌氧消化泥和好氧硝化泥,通过调控进水氨氮与亚硝酸盐氮的含量,分析出水基质浓度,实现厌氧氨氧化菌的快速富集培养。通过对比发现,接种好氧硝化泥的反应器最先开始厌氧氨氧化反应,接种厌氧消化泥的反应器则耗时最长,其余接种不同比例厌氧消化泥与好氧硝化泥混合污泥三种比例的反应器,则是随着厌氧消化泥比例的增加厌氧氨氧化反应的启动速度逐渐变慢,这说明工业中厌氧氨氧化菌的快速富集培养以接种好氧硝化泥更为有利。2.在有效容积为12L的UASB反应器中接种已具有一定厌氧氨氧化活性的污泥,保持进水pH值7.5左右,反应器温度35℃,通过在不同阶段增加进水氨氮和亚硝酸盐氮浓度,改变水力停留时间,可70 d成功启动厌氧氨氧化反应。3.在UASB反应器成功启动并且稳定运行的基础上,通过改变进水pH值和反应器温度,每隔12h测定反应器中基质浓度,研究pH值和温度对氨氮去除效果的影响。实验结果表明,pH值为7.5、温度在30～35℃时氨氮去除效果最佳,氨氮去除率高达87.88%,在厌氧氨氧化菌生长适宜的范围之内,并且符合工业要求。4.对运行时间、进水pH值及温度对出水氨氮浓度的影响进行多元回归分析,以运行时间、进水pH值及温度为自变量,以出水氨氮浓度为因变量,得到回归方程模型：y=-464.5535154+28.73789971x3-0.077251892x1x3-7.475279169x2x3 +0.010083796x1x2x3+16.04656061x22+0.445154394x23温度是影响厌氧氨氧化反应出水氨氮浓度的主要影响因素,温度与运行时间、温度与pH值的协同作用共同影响出水氨氮浓度。运行时间、温度及pH值三个变量可以影响出水氨氮浓度的84.29%,其余的15.71%可能是由其他因素来影响。根据天冠污水pH和温度的不同,可以根据所建立的模型,适当调控运行时间,从而达到最佳除氮效果。
[Abstract]:After the traditional treatment of cassava fuel ethanol production wastewater, there are still a large number of high concentration of high nitrogen and low carbon wastewater can not be properly treated, which seriously affects the water environment in China. Higher and higher water quality standards also put forward new requirements for wastewater denitrification process. As a new autotrophic biological denitrification process with high efficiency and energy saving, anaerobic ammonia oxidation has the advantages of no additional carbon source, low sludge yield and so on. The purpose of this study is to improve the engineering practice of the anaerobic ammonia oxidation reactor for the wastewater of Tianguan Group. The concentration and removal rate of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen were compared between aerobic nitrifying sludge and anaerobic digested sludge in different inoculation ratio, and the best enrichment mode of anaerobic ammonia oxidized sludge was selected. The UASB reactor was used to treat cassava fuel ethanol wastewater from Tianguan Group. The favorable conditions suitable for the growth of anaerobic ammonia-oxidizing bacteria were selected and controlled. The optimal control factors and operation parameters were sought to realize the economical and efficient treatment of low C / N ratio wastewater. The process of anaerobic ammonia oxidation of wastewater was improved. By adjusting the pH value and reaction temperature of influent, the effect of ammonia nitrogen concentration on pH value, reaction temperature and operation time was analyzed. The results of the study show that 1: 1. Different proportion of anaerobic digestible sludge and aerobic nitrification sludge were inoculated in simulated ASBR reactor. The concentration of water matrix was analyzed by adjusting the content of influent ammonia nitrogen and nitrite nitrogen, and the rapid enrichment culture of anaerobic ammonia-oxidizing bacteria was realized. By comparison, it was found that the reactor inoculated with aerobic nitrifying sludge first began the anaerobic ammonia oxidation reaction, while the reactor inoculated with anaerobic digested sludge took the longest time. The other reactors inoculated with different proportion of mixed sludge of anaerobic digestible sludge and aerobic nitrification sludge, the start-up speed of anaerobic ammonia oxidation reaction became slower with the increase of anaerobic digested sludge ratio. This indicated that the rapid enrichment and culture of anaerobic ammonia-oxidizing bacteria in industry to inoculate aerobic nitrification sludge was more advantageous. In a 12L UASB reactor, sludge with certain anaerobic ammonia oxidation activity was inoculated, the influent pH value was kept around 7.5, the reactor temperature was 35 鈩，
本文编号：2241563
[Abstract]:After the traditional treatment of cassava fuel ethanol production wastewater, there are still a large number of high concentration of high nitrogen and low carbon wastewater can not be properly treated, which seriously affects the water environment in China. Higher and higher water quality standards also put forward new requirements for wastewater denitrification process. As a new autotrophic biological denitrification process with high efficiency and energy saving, anaerobic ammonia oxidation has the advantages of no additional carbon source, low sludge yield and so on. The purpose of this study is to improve the engineering practice of the anaerobic ammonia oxidation reactor for the wastewater of Tianguan Group. The concentration and removal rate of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen were compared between aerobic nitrifying sludge and anaerobic digested sludge in different inoculation ratio, and the best enrichment mode of anaerobic ammonia oxidized sludge was selected. The UASB reactor was used to treat cassava fuel ethanol wastewater from Tianguan Group. The favorable conditions suitable for the growth of anaerobic ammonia-oxidizing bacteria were selected and controlled. The optimal control factors and operation parameters were sought to realize the economical and efficient treatment of low C / N ratio wastewater. The process of anaerobic ammonia oxidation of wastewater was improved. By adjusting the pH value and reaction temperature of influent, the effect of ammonia nitrogen concentration on pH value, reaction temperature and operation time was analyzed. The results of the study show that 1: 1. Different proportion of anaerobic digestible sludge and aerobic nitrification sludge were inoculated in simulated ASBR reactor. The concentration of water matrix was analyzed by adjusting the content of influent ammonia nitrogen and nitrite nitrogen, and the rapid enrichment culture of anaerobic ammonia-oxidizing bacteria was realized. By comparison, it was found that the reactor inoculated with aerobic nitrifying sludge first began the anaerobic ammonia oxidation reaction, while the reactor inoculated with anaerobic digested sludge took the longest time. The other reactors inoculated with different proportion of mixed sludge of anaerobic digestible sludge and aerobic nitrification sludge, the start-up speed of anaerobic ammonia oxidation reaction became slower with the increase of anaerobic digested sludge ratio. This indicated that the rapid enrichment and culture of anaerobic ammonia-oxidizing bacteria in industry to inoculate aerobic nitrification sludge was more advantageous. In a 12L UASB reactor, sludge with certain anaerobic ammonia oxidation activity was inoculated, the influent pH value was kept around 7.5, the reactor temperature was 35 鈩，
本文编号：2241563
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