一体化反应器处理高氨氮废水的中试启动及运行控制研究

发布时间：2018-05-23 06:20

本文选题：亚硝化 + 厌氧氨氧化　；参考：《苏州科技大学》2017年硕士论文

【摘要】：本文针对高氨氮废水的处理,启动了中试PN-ANAMMOX一体化实验装置。本文首先从亚硝化的启动着手,研究了亚硝化启动过程中的控制策略以及能力提升过程中的参数控制。然后通过降低进水氨氮负荷以及同步降低曝气量等方式实现了符合ANAMMOX工艺进水配比的亚硝化反应器的调控。最后将PN-ANAMMOX联合在一起,实现联合工艺的稳定运行及其脱氮能力的提升,并借助于qPCR分析了各区域功能菌的变化。本研究旨在为高氨废水的高效低耗脱氮提供新思路和理论指导。主要研究结果如下:(1)中试连续流亚硝化反应器在中温(19~27℃)的条件下,通过对不同运行阶段的溶解氧进行调控(前期DO=6.0±1.0mg·L-1、后期DO=0.6±0.1mg·L-1),以及根据亚硝酸盐产生速率的提升合适的提高进水氨氮负荷和对曝气量的合理调控是中试连续流亚硝化反应器成功启动的关键。经过110天的运行,反应器的NPR达到了1.2 kg N m-3·d-1。(2)通过高FA、高FNA以及低DO的联合抑制可以有效的启动亚硝化过程,本实验在启动过程中控制了FA浓度在5.0~20mg·L-1、FNA浓度在0.025~0.033 mg/L及DO浓度在0.6±0.1mg·L-1之间,实现AOB的富集、NOB的淘汰、中试连续流亚硝化反应器的成功启动,亚硝化成功启动后出水硝氮浓度稳定在8 mg·L-1,NAR稳定在0.98以上。(3)通过110天的运行,中试连续流亚硝化反应器中功能微生物AOB的占比逐渐提高,从启动初期的5.3×109到成功启动后AOB的拷贝数达到了1.6×1011,NOB的拷贝数反而从1.1×1010下降到1.2×109,AOB拷贝数的数量级比NOB的要高2个数量级,这也是反应器内部硝氮浓度较低以及高NAR的原因所在。(4)中试连续流亚硝化反应器在中温(31~35℃)的条件下,通过降低进水氨氮负荷,降低供气量以及将反应器内部多余的亚硝化污泥排除系统,成功的实现了匹配ANAMMOX工艺进水的亚硝化反应的调控。匹配成功后ANAMMOX工艺进水水质配比亚氮:氨氮=(1.0-1.5):1。(5)通过高FA、适宜的温度以及低DO的联合抑制可以有效的抑制NOB的活性。本实验在调控匹配ANAMMOX工艺进水的亚硝化过程中控制了FA浓度在2~8mg·L-1、温度在31℃~35℃及DO浓度在0.5~1mg·L-1之间,可有效的抑制NOB的活性,NAR稳定在0.92以上。(6)在联合工艺脱氮能力提升的过程中,通过提高进水氨氮浓度和提高进水流量两种方式提高进水氮负荷,经过71天的运行,反应器脱氮速率达到0.431kg N m-3·d-1。(7)采取可实时监测联合工艺运行参数的WTW监测仪器对反应器运行状况进行监测,可及时获取相关数据,并对当前的运行状况可作出及时调整,可减少反应器在运行过程中处于非正常运行状态的时间,对反应器脱氮能力的提升起到了非常大的作用。(8)根据反应器出现问题应及时的采取相应措施进行恢复,尽量减少反应器处于不正常状态下的时间,同时实现对反应器内部的数据也应进行及时的监测,只有了解了反应器内部的情况后才能对参数上得出的相关经验结论进行验证,并进行调整。
[Abstract]:Aiming at the treatment of high ammonia nitrogen waste water, a pilot PN-ANAMMOX integrated experimental device was started. Firstly, starting from the start of nitrification, the control strategy and the parameter control during the process of nitrosation start were studied, and then the characters were realized by reducing the load of inflow ammonia nitrogen and reducing the aeration synchronously. The ANAMMOX process is controlled by the nitrosation reactor of the influent ratio. Finally, the PN-ANAMMOX is combined to achieve the stable operation of the combined process and the lifting of the nitrogen removal capacity, and the changes in the functional bacteria in various regions are analyzed with the help of qPCR. The aim of this study is to provide new ideas and theoretical guidance for the high efficiency and low consumption of nitrogen in the high ammonia wastewater. The results are as follows: (1) under the condition of medium temperature (19~27 C), the pilot continuous flow nitrosation reactor regulates the dissolved oxygen at different stages (pre DO=6.0 1.0mg / L-1, DO=0.6 + 0.1mg L-1), as well as the improvement of the influent ammonia nitrogen load and the reasonable regulation of aeration according to the enhancement of nitrite production rate. After 110 days' operation, the NPR of the reactor reached 1.2 kg N m-3. D-1. (2) through high FA, high FNA and low DO, which could effectively start the nitrosation process. The concentration is between 0.6 + 0.1mg and L-1, which realizes the enrichment of AOB, the elimination of NOB, the successful start of the continuous flow nitrosation reactor, the nitrite nitrogen concentration is stable at 8 mg. L-1, and the NAR is stable over 0.98. (3) the ratio of functional microorganisms AOB to the continuous flow nitrosation reactor is gradually increased through the operation of 110 days. The number of copies of AOB reached 1.6 * 1011 from the initial start of the initial start, and the copy number of NOB dropped from 1.1 x 1010 to 1.2 * 109, and the number of AOB copies was 2 orders of magnitude higher than that of NOB. This was also the cause of the low nitrate concentration and high NAR in the reactor. (4) the continuous flow nitrosation reactor in the medium temperature (3) (4) was in the middle temperature (4). Under the condition of 1~35 C), by reducing the load of ammonia nitrogen, reducing the amount of gas supply and removing the excess nitrification sludge removal system inside the reactor, the subnitrification reaction was successfully realized by matching the influent of the ANAMMOX process. After the match, the water quality of the ANAMMOX process was proportional to nitrogen: ammonia nitrogen = (1.0-1.5): 1. (5) passed the high FA, suitable temperature. The combined inhibition of degree and low DO can effectively inhibit the activity of NOB. In this experiment, the concentration of FA was controlled in 2~8mg. L-1 during the process of regulating the influent nitrosation of the matched ANAMMOX process. The temperature was between 0.5~1mg and DO at 31 degrees C and DO concentration. The NOB activity was effectively suppressed, and NAR stabilized at 0.92. (6) the ability to remove nitrogen from the combined process. In the process of rising, the influent nitrogen load is increased by increasing the influent ammonia nitrogen concentration and increasing the influent flow rate. After 71 days of operation, the nitrogen removal rate of the reactor reaches 0.431kg N m-3. D-1. (7). The WTW monitoring instrument which can monitor the operating parameters of the joint process can monitor the operating condition of the reactor, and the relevant data can be obtained in time. And the current operation condition can be adjusted in time, which can reduce the time of the reactor in the abnormal running state and improve the nitrogen removal capacity of the reactor. (8) according to the problem of the reactor, the corresponding measures should be taken in time to recover and minimize the unnormal state of the reactor. At the same time, the data within the reactor should be monitored in time. Only after understanding the internal situation of the reactor can the relevant empirical conclusions from the parameters be verified and adjust.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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