【摘要】：好氧顆粒污泥是好氧條件下微生物通過自固定作用形成的微生物聚合體,因其在污水處理領(lǐng)域具有很好的應(yīng)用前景而被廣泛研究。但好氧污泥的顆�；^程仍是影響其工程實(shí)際應(yīng)用的關(guān)鍵因素。本文基于元胞自動(dòng)機(jī)建立了好氧顆粒污泥三維多種群數(shù)學(xué)模型,研究好氧顆粒污泥的生長(zhǎng)過程及不同因素對(duì)其的影響。本文研究了好氧顆粒污泥的內(nèi)源呼吸過程,結(jié)果表明內(nèi)源呼吸過程中細(xì)胞會(huì)氧化自身及其胞內(nèi)貯存物從而釋放出能量和物質(zhì)。分別采用活性污泥1號(hào)模型(Activated Sludge Model No.1,ASM1)和活性污泥3號(hào)模型(Activated Sludge Model No.3,ASM3)擬合實(shí)驗(yàn)數(shù)據(jù),結(jié)果顯示ASM3在模擬內(nèi)源呼吸過程上效果更好,利用ASM3擬合的異養(yǎng)菌內(nèi)源呼吸速率為0.15 d-1,胞內(nèi)貯存物的呼吸速率為1.55 d-1。另外,好氧顆粒污泥內(nèi)源呼吸過程中耗氧呼吸速率(Oxygen Uptake Rate,OUR)曲線分為明顯的兩個(gè)階段。顆粒污泥中胞內(nèi)貯存物所占比例很低,但對(duì)OUR的貢獻(xiàn)較大。在好氧顆粒污泥內(nèi)源呼吸過程數(shù)學(xué)模擬的基礎(chǔ)上,選擇基于ASM3建立雙形態(tài)多種群抑制動(dòng)力學(xué)模型,研究毒性物質(zhì)對(duì)好氧顆粒污泥和絮體污泥的抑制作用。模型中考慮了物質(zhì)擴(kuò)散、貯存、生長(zhǎng)和內(nèi)源呼吸過程。顆粒污泥的OUR實(shí)驗(yàn)驗(yàn)證了模型的有效性,模擬結(jié)果表明,與絮體污泥相比好氧顆粒污泥對(duì)毒性作用呈現(xiàn)較高的承受力。毒性物質(zhì)對(duì)顆粒污泥的特殊抑制現(xiàn)象可能是由于顆粒污泥的密實(shí)結(jié)構(gòu)提供了保護(hù)作用,限制了毒性物質(zhì)的擴(kuò)散。所以,粒徑較大的顆粒污泥在處理有毒有害廢水上有較好的潛力。在已建的雙形態(tài)多種群數(shù)學(xué)模型的基礎(chǔ)上,運(yùn)用元胞自動(dòng)機(jī)的理論,建立好氧顆粒污泥三維多種群數(shù)學(xué)模型。研究不同條件下好氧顆粒污泥的生長(zhǎng)過程及其內(nèi)部微生物的空間分布。模擬結(jié)果顯示,較高剪切力下形成的顆粒污泥粒徑較小,但顆粒內(nèi)部自養(yǎng)菌含量較高。而較高溶解氧濃度下形成的顆粒污泥粒徑較大,并且顆粒內(nèi)部自養(yǎng)菌含量較高。另外,毒性物質(zhì)會(huì)抑制顆粒污泥粒徑的增長(zhǎng),并且在顆粒污泥內(nèi)部形成自養(yǎng)菌、毒性物質(zhì)降解菌主要位于顆粒污泥外層,而普通異養(yǎng)菌主要存在于顆粒污泥內(nèi)部的空間分布。
[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.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X703

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本文編號(hào)：2297266