基于元胞自动机的好氧颗粒污泥三维多种群数学模型研究
发布时间：2018-10-29 09:13
【摘要】：好氧颗粒污泥是好氧条件下微生物通过自固定作用形成的微生物聚合体,因其在污水处理领域具有很好的应用前景而被广泛研究。但好氧污泥的颗粒化过程仍是影响其工程实际应用的关键因素。本文基于元胞自动机建立了好氧颗粒污泥三维多种群数学模型,研究好氧颗粒污泥的生长过程及不同因素对其的影响。本文研究了好氧颗粒污泥的内源呼吸过程,结果表明内源呼吸过程中细胞会氧化自身及其胞内贮存物从而释放出能量和物质。分别采用活性污泥1号模型(Activated Sludge Model No.1,ASM1)和活性污泥3号模型(Activated Sludge Model No.3,ASM3)拟合实验数据,结果显示ASM3在模拟内源呼吸过程上效果更好,利用ASM3拟合的异养菌内源呼吸速率为0.15 d-1,胞内贮存物的呼吸速率为1.55 d-1。另外,好氧颗粒污泥内源呼吸过程中耗氧呼吸速率(Oxygen Uptake Rate,OUR)曲线分为明显的两个阶段。颗粒污泥中胞内贮存物所占比例很低,但对OUR的贡献较大。在好氧颗粒污泥内源呼吸过程数学模拟的基础上,选择基于ASM3建立双形态多种群抑制动力学模型,研究毒性物质对好氧颗粒污泥和絮体污泥的抑制作用。模型中考虑了物质扩散、贮存、生长和内源呼吸过程。颗粒污泥的OUR实验验证了模型的有效性,模拟结果表明,与絮体污泥相比好氧颗粒污泥对毒性作用呈现较高的承受力。毒性物质对颗粒污泥的特殊抑制现象可能是由于颗粒污泥的密实结构提供了保护作用,限制了毒性物质的扩散。所以,粒径较大的颗粒污泥在处理有毒有害废水上有较好的潜力。在已建的双形态多种群数学模型的基础上,运用元胞自动机的理论,建立好氧颗粒污泥三维多种群数学模型。研究不同条件下好氧颗粒污泥的生长过程及其内部微生物的空间分布。模拟结果显示,较高剪切力下形成的颗粒污泥粒径较小,但颗粒内部自养菌含量较高。而较高溶解氧浓度下形成的颗粒污泥粒径较大,并且颗粒内部自养菌含量较高。另外,毒性物质会抑制颗粒污泥粒径的增长,并且在颗粒污泥内部形成自养菌、毒性物质降解菌主要位于颗粒污泥外层,而普通异养菌主要存在于颗粒污泥内部的空间分布。
[Abstract]:Aerobic granular sludge is a microbial polymer formed by microbial self-immobilization under aerobic conditions. It has been widely studied because of its good application prospect in wastewater treatment. However, aerobic sludge granulation process is still a key factor affecting its practical application. Based on cellular automata, a three-dimensional multigroup mathematical model of aerobic granular sludge was established, and the growth process of aerobic granular sludge and the influence of different factors on it were studied. The endogenous respiration process of aerobic granular sludge was studied in this paper. The results showed that the cells oxidized themselves and their intracellular storage during endogenous respiration, thus releasing energy and substance. The experimental data were fitted with activated sludge model 1 (Activated Sludge Model No.1,ASM1) and activated sludge model 3 (Activated Sludge Model No.3,ASM3) respectively. The results showed that ASM3 was more effective in simulating endogenous respiration. The endogenous respiration rate of heterotrophic bacteria was 0.15 d ~ (-1) and the respiration rate of intracellular storage was 1.55 d ~ (-1) by ASM3 fitting. In addition, the oxygen consumption respiration rate (Oxygen Uptake Rate,OUR) curve of aerobic granular sludge was divided into two stages. The proportion of intracellular storage in granular sludge is very low, but the contribution to OUR is great. Based on the mathematical simulation of endogenous respiration process of aerobic granular sludge, a two-form multi-group inhibition kinetic model was established based on ASM3 to study the inhibitory effect of toxic substances on aerobic granular sludge and floc sludge. Material diffusion, storage, growth and endogenous respiration are considered in the model. The OUR experiment of granular sludge verified the validity of the model. The simulation results showed that aerobic granular sludge had higher tolerance to toxicity than flocculation sludge. The special inhibition of toxic substances on granular sludge may be due to the protective effect of the dense structure of granular sludge, which limits the diffusion of toxic substances. Therefore, granular sludge with large particle size has good potential in treating toxic and harmful wastewater. On the basis of the established mathematical model of two-form multi-group, the three-dimensional multi-group mathematical model of aerobic granular sludge was established by using the theory of cellular automata. The growth process of aerobic granular sludge and the spatial distribution of microorganism in aerobic granular sludge were studied under different conditions. The results showed that the particle size of granular sludge formed under high shear stress was smaller, but the content of autotrophic bacteria was higher. The granular sludge with higher dissolved oxygen concentration had larger particle size and higher autotrophic bacteria content. In addition, toxic substances can inhibit the growth of granular sludge particle size and form autotrophic bacteria in granular sludge. The biodegradation bacteria are mainly located in the outer layer of granular sludge, while the common heterotrophic bacteria mainly exist in the spatial distribution of granular sludge.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
本文编号：2297266
[Abstract]:Aerobic granular sludge is a microbial polymer formed by microbial self-immobilization under aerobic conditions. It has been widely studied because of its good application prospect in wastewater treatment. However, aerobic sludge granulation process is still a key factor affecting its practical application. Based on cellular automata, a three-dimensional multigroup mathematical model of aerobic granular sludge was established, and the growth process of aerobic granular sludge and the influence of different factors on it were studied. The endogenous respiration process of aerobic granular sludge was studied in this paper. The results showed that the cells oxidized themselves and their intracellular storage during endogenous respiration, thus releasing energy and substance. The experimental data were fitted with activated sludge model 1 (Activated Sludge Model No.1,ASM1) and activated sludge model 3 (Activated Sludge Model No.3,ASM3) respectively. The results showed that ASM3 was more effective in simulating endogenous respiration. The endogenous respiration rate of heterotrophic bacteria was 0.15 d ~ (-1) and the respiration rate of intracellular storage was 1.55 d ~ (-1) by ASM3 fitting. In addition, the oxygen consumption respiration rate (Oxygen Uptake Rate,OUR) curve of aerobic granular sludge was divided into two stages. The proportion of intracellular storage in granular sludge is very low, but the contribution to OUR is great. Based on the mathematical simulation of endogenous respiration process of aerobic granular sludge, a two-form multi-group inhibition kinetic model was established based on ASM3 to study the inhibitory effect of toxic substances on aerobic granular sludge and floc sludge. Material diffusion, storage, growth and endogenous respiration are considered in the model. The OUR experiment of granular sludge verified the validity of the model. The simulation results showed that aerobic granular sludge had higher tolerance to toxicity than flocculation sludge. The special inhibition of toxic substances on granular sludge may be due to the protective effect of the dense structure of granular sludge, which limits the diffusion of toxic substances. Therefore, granular sludge with large particle size has good potential in treating toxic and harmful wastewater. On the basis of the established mathematical model of two-form multi-group, the three-dimensional multi-group mathematical model of aerobic granular sludge was established by using the theory of cellular automata. The growth process of aerobic granular sludge and the spatial distribution of microorganism in aerobic granular sludge were studied under different conditions. The results showed that the particle size of granular sludge formed under high shear stress was smaller, but the content of autotrophic bacteria was higher. The granular sludge with higher dissolved oxygen concentration had larger particle size and higher autotrophic bacteria content. In addition, toxic substances can inhibit the growth of granular sludge particle size and form autotrophic bacteria in granular sludge. The biodegradation bacteria are mainly located in the outer layer of granular sludge, while the common heterotrophic bacteria mainly exist in the spatial distribution of granular sludge.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
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