本文選題：微孔曝氣器 + 氧轉(zhuǎn)移率　； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：微孔曝氣器以傳統(tǒng)的曝氣方式在處理廢水時,電耗的費用占整個污水處理系統(tǒng)運行費用的40%,其中曝氣系統(tǒng)約占污水處理系統(tǒng)電耗的60%以上。對曝氣系統(tǒng)進行研究,尋求新的曝氣運動方式來提高污水處理效率、降低運行成本,對推進水處理系統(tǒng)推廣及運行具有重要意義。針對曝氣池連續(xù)曝氣過程中氧轉(zhuǎn)移率低、能耗高的問題,本文結(jié)合污水處理中的實際情況,分析影響氧轉(zhuǎn)移速率的因素,提出了利用盤式微孔曝氣器間歇性充氧方法來提高氧的轉(zhuǎn)移率的方法。本文一共分為五章,內(nèi)容組織如下:第一章基于污水處理的工程系統(tǒng)及耗能因素現(xiàn)狀分析,討論了微孔曝氣器現(xiàn)存的不足,提出微孔間歇性曝氣器設(shè)計思想,詳細(xì)分析了盤式微孔曝氣的工作原理及特點,同時對微孔間歇性曝氣和自激式曝氣元件的工作原理進行簡單的概述。第二章基于曝氣充氧的原理,深入分析了氧傳質(zhì)經(jīng)典理論,并研究了曝氣膜片、孔口特性和參數(shù)對氣泡生成的影響,從理論上得出間歇性曝氣可減小氣泡的尺寸,增加氣液接觸面積,從而提高氧轉(zhuǎn)移率,建立了間歇性曝氣氧傳質(zhì)模型,分析其影響因素。第三章詳細(xì)分析了微孔間歇性曝氣氣泡生成理論,就柔性孔和剛性孔進行了氣泡生成的對比和給出了發(fā)現(xiàn)了間歇性氣泡生成的規(guī)律,討論了間歇性曝氣相對于連續(xù)曝氣對曝氣充氧性能的影響。第四章闡述了微孔間歇性曝氣實驗設(shè)計過程和實驗方案的實施。詳細(xì)介紹了利用PLC控制曝氣結(jié)構(gòu)裝置和自激閥曝氣結(jié)構(gòu)裝置,同時簡述了用于曝氣效果檢測的實驗儀器和藥品,以及曝氣性能測定的原理和方法。第五章基于實驗數(shù)據(jù)進行了總結(jié)分析。利用圖像處理分析氣泡生成狀況,得到間歇性曝氣可以有效減小氣泡尺寸;利用充氧性能評價標(biāo)準(zhǔn)對間歇性曝氣和連續(xù)曝氣實驗數(shù)據(jù)分別進行處理,對比各項性能指標(biāo),驗證微孔曝氣器間歇性曝氣可以提高曝氣充氧效率、降低能耗,獲得最佳間歇曝氣周期。本文通過4組不同類型的盤式微孔曝氣器分別在間歇性和連續(xù)曝氣下的實驗對比發(fā)現(xiàn),間歇性曝氣產(chǎn)生的是氣泡簇,對生成的氣泡進行圖像統(tǒng)計分析,得出同一區(qū)域范圍內(nèi)間歇式曝氣生成的氣泡數(shù)量多、平均直徑小。實驗數(shù)據(jù)分析結(jié)果顯示:雖然間歇性曝氣達到氧飽和所需的時間較連續(xù)曝氣方式增加了10%左右,但是氧的利用率增加了50%以上,動力效率大幅提高。結(jié)果顯示間歇性曝氣方式可有效提高氧的利用率,節(jié)約能耗的同時又具有更好的充氧效果,為活性污泥好氧生化處理系統(tǒng)工藝提供了新的研究思路。
[Abstract]:In the treatment of wastewater with the traditional aeration method, the cost of electricity consumption accounts for 40% of the total operating cost of the wastewater treatment system, in which the aeration system accounts for more than 60% of the power consumption of the wastewater treatment system. It is of great significance to promote the popularization and operation of water treatment system by studying aeration system and seeking new aeration movement mode to improve sewage treatment efficiency and reduce operation cost. In view of the problems of low oxygen transfer rate and high energy consumption in continuous aeration process of aeration tank, the factors affecting oxygen transfer rate are analyzed according to the actual situation in wastewater treatment. A method of increasing oxygen transfer rate by intermittent oxygenation of disc microporous aerator is proposed. This paper is divided into five chapters. The content is organized as follows: in Chapter 1, based on the analysis of wastewater treatment engineering system and energy consumption factors, the shortcomings of microporous aerator are discussed, and the design idea of microporous intermittent aerator is put forward. The working principle and characteristics of disc micropore aeration are analyzed in detail. At the same time, the working principles of micropore intermittent aeration and self-excited aeration element are briefly summarized. In the second chapter, based on the principle of aeration and oxygenation, the classical theory of oxygen mass transfer is deeply analyzed, and the effects of the characteristics and parameters of aerated diaphragm, orifice and orifice on bubble formation are studied. It is theoretically concluded that intermittent aeration can reduce the bubble size. The oxygen transfer rate was improved by increasing the gas-liquid contact area. The oxygen transfer model of intermittent aeration was established and the influencing factors were analyzed. In chapter 3, the theory of intermittent aeration bubble formation is analyzed in detail. The bubble formation is compared between flexible pore and rigid pore, and the regularity of intermittent bubble formation is found. The effect of intermittent aeration on aeration performance was discussed. The fourth chapter describes the design process of micropore intermittent aeration experiment and the implementation of experimental scheme. This paper introduces the aeration structure device controlled by PLC and the aeration structure device of self-excited valve in detail. At the same time, the experimental instruments and drugs used for aeration effect detection, as well as the principle and method of aeration performance measurement are briefly described. Chapter 5 is based on the experimental data. The bubble size can be effectively reduced by using image processing to analyze the bubble formation, and the experimental data of intermittent aeration and continuous aeration are processed separately by using the oxygenation performance evaluation standard, and the performance indexes are compared. It is proved that intermittent aeration of microporous aerator can improve aeration efficiency, reduce energy consumption and obtain optimal intermittent aeration cycle. In this paper, the experimental results of four different types of disc microporous aerators under intermittent and continuous aeration show that the bubbles produced by intermittent aeration are bubble clusters, and the generated bubbles are analyzed by image statistics. The results show that the number of bubbles generated by intermittent aeration in the same area is large and the average diameter is small. The experimental data show that although the time required for intermittent aeration to achieve oxygen saturation is increased by about 10% compared with continuous aeration, the utilization rate of oxygen is increased by more than 50%, and the dynamic efficiency is greatly improved. The results show that intermittent aeration can effectively improve the utilization rate of oxygen, save energy consumption and have better oxygenation effect. It provides a new research idea for aerobic biochemical treatment system of activated sludge.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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