處理難降解有毒有機(jī)物的旋流式壅塞空化技術(shù)研究
本文選題:壅塞空化 + 降解苯酚; 參考:《湖南工業(yè)大學(xué)》2016年碩士論文
【摘要】:在水污染問題日益嚴(yán)重的今天,研究開發(fā)新的水處理設(shè)備及技術(shù)受到越來越多的重視?栈(yīng)在空泡潰滅瞬間產(chǎn)生具有強(qiáng)氧化性的羥自由基,微射流,激波和剪切擾動,能夠使難降解有毒有機(jī)物得到降解。本文在環(huán)流式壅塞空化器的基礎(chǔ)上,提出一種新型水力空化發(fā)生器——旋流式壅塞空化器,并對難降解有毒有機(jī)物的旋流式壅塞空化處理技術(shù)進(jìn)行研究。利用CFD軟件對旋流式壅塞空化器內(nèi)部流場進(jìn)行數(shù)值仿真,改變壅塞空化器的背壓、旋流芯長度等結(jié)構(gòu)參數(shù),研究產(chǎn)生壅塞空化效應(yīng)的參數(shù)組合。結(jié)果表明:旋流式壅塞空化器能產(chǎn)生壅塞空化現(xiàn)象,兩股旋轉(zhuǎn)射流形成的大渦環(huán)有利于空泡的產(chǎn)生和長大,空泡在壅塞截面處得到有效潰滅。有利于空化產(chǎn)生的參數(shù)組合為3/4導(dǎo)程長度的旋流芯和0.2MPa的背壓。搭建難降解有毒有機(jī)物的旋流式壅塞空化處理技術(shù)試驗平臺,以苯酚水溶液模擬難降解有毒有機(jī)物廢水,以旋流式壅塞空化器為處理裝置,實驗研究旋流式壅塞空化的處理技術(shù)。通過改變背壓、旋流芯長度、苯酚溶液初始濃度以及循環(huán)次數(shù)等參數(shù),對苯酚進(jìn)行降解試驗,采用高效液相色譜儀對處理前后的苯酚濃度進(jìn)行檢測。研究結(jié)果表明:旋流式壅塞空化器能有效地降解苯酚水溶液。旋流式壅塞空化器發(fā)生壅塞空化具有最佳的背壓和旋流芯長度。當(dāng)苯酚溶液初始質(zhì)量濃度為5mg/L,循環(huán)200次,背壓約200k Pa,旋流芯長度為3/4時,苯酚溶液的降解率達(dá)到最高值28.8%。
[Abstract]:With the increasing water pollution problem, more and more attention has been paid to the research and development of new water treatment equipment and technology. The cavitation effect produces strongly oxidized hydroxyl radical, micro-jet, shock wave and shearing disturbance at the instant of cavitation collapse, which can degrade the refractory toxic organic matter. On the basis of circulating choking cavitation device, a new type of hydraulic cavitation generator, swirl choking cavitation generator, is proposed in this paper, and the treatment technology of swirling choking cavitation which is difficult to degrade toxic organic matter is studied. The numerical simulation of the internal flow field of the swirling choking cavitation device is carried out by using CFD software. The backpressure of the choking cavitation device and the length of the swirl core are changed, and the combination of the parameters that produce the choking cavitation effect is studied. The results show that the swirl choking cavitation can cause choking cavitation. The large vortex ring formed by two rotating jets is favorable to the generation and growth of cavitation, and the cavitation collapses effectively at the choked section. The parameters favorable to cavitation are the swirl core with 3 / 4 lead length and the back pressure of 0.2 MPA. The experimental platform of swirl choking cavitation treatment technology for refractory toxic organic compounds was set up. The phenol aqueous solution was used to simulate the refractory toxic organic wastewater, and the swirling choking cavitation device was used as the treatment device. Experimental study on the treatment of swirling choking cavitation. The phenol degradation test was carried out by changing the parameters such as back pressure, swirl core length, initial concentration of phenol solution and the number of cycles. The phenol concentration before and after treatment was detected by high performance liquid chromatography (HPLC). The results show that the swirling choking cavitation device can effectively degrade phenol aqueous solution. The choking cavitation of swirl choking device has the best backpressure and swirl core length. When the initial mass concentration of phenol solution is 5 mg / L, circulation is 200 times, back pressure is about 200 k Paand the length of swirl core is 3 / 4, the degradation rate of phenol solution reaches the highest value of 28.8g 路L ~ (-1).
【學(xué)位授予單位】:湖南工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:X703.3
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