【摘要】：三維電極法是近年來(lái)新興的水處理技術(shù),其具有處理效率高、能耗低、能夠徹底降解污染物、無(wú)二次污染等優(yōu)點(diǎn),是目前研究的熱點(diǎn)之一。但是三維電極反應(yīng)器降解有機(jī)物過(guò)程復(fù)雜,所以其降解機(jī)理至今還未有定論。近年來(lái),國(guó)內(nèi)外持續(xù)關(guān)注藥品和個(gè)人護(hù)理用品(PPCPs)對(duì)環(huán)境的污染。非那西丁就是PPCPs中的一種典型污染物,其具有危害性大、毒性強(qiáng)、很難被一般微生物所降解等特點(diǎn)。論文采用三維電極反應(yīng)器對(duì)非那西丁模擬廢水進(jìn)行電化學(xué)氧化實(shí)驗(yàn)研究。實(shí)驗(yàn)采用石墨電極作為陰極和陽(yáng)極,自制A/B粒子作為第三維粒子電極,對(duì)模擬非那西丁廢水進(jìn)行了處理。實(shí)驗(yàn)揭示其電化學(xué)氧化機(jī)理,發(fā)現(xiàn)非那西丁降解的中間產(chǎn)物并推導(dǎo)其降解過(guò)程,探索三維電極反應(yīng)器降解非那西丁的最佳工藝條件。研究了三維電極對(duì)有機(jī)物的降解機(jī)理。其降解機(jī)理是通過(guò)直接電化學(xué)氧化和間接電化學(xué)氧化共同作用下對(duì)有機(jī)物進(jìn)行降解,直接電化學(xué)氧化主要能夠去除非那西丁分子上的支鏈,間接電化學(xué)氧化產(chǎn)生的羥基自由基能夠打開(kāi)苯環(huán),從而徹底礦化有機(jī)物。氧氣的加入可以使電化學(xué)氧化效率提高。借助液相色譜-質(zhì)譜聯(lián)用儀定性分析三維電極降解非那西丁的9種中間產(chǎn)物,推測(cè)非那西丁電催化氧化可能的兩條降解途徑。采用三維電極反應(yīng)器處理模擬非那西丁廢水,研究了電流密度、廢水初始PH值、曝氣量對(duì)COD去除率的影響。在最佳參數(shù)條件下,即電流密度為10mA/cm2,廢水初始PH為5,曝氣量為0.2m3/h時(shí)廢水電化學(xué)氧化4h,COD去除率可達(dá)到73.4%。
[Abstract]:The three-dimensional electrode method is an emerging water treatment technology in recent years, which has the advantages of high treatment efficiency, low energy consumption, complete degradation of pollutants, no secondary pollution and the like, and is one of the hot spots at present. However, the degradation mechanism of the three-dimensional electrode reactor has not been decided yet. In recent years, the environmental pollution of drug and personal care products (PPCPs) has been continuously concerned at home and abroad. The non-phenacetin is a typical pollutant in PPCPs, which has the characteristics of large harm, strong toxicity, and being difficult to be degraded by the general microorganisms. In this paper, a three-dimensional electrode reactor was used to study the electrochemical oxidation of the non-Nasiddin simulated wastewater. In the experiment, the graphite electrode was used as the cathode and the anode, and the self-made A/ B particles were used as the third-dimensional particle electrode. In this paper, the electrochemical oxidation mechanism was revealed, and the degradation process was derived and the optimum process conditions for the degradation of the non-siddin by the three-dimensional electrode reactor were investigated. The degradation mechanism of the three-dimensional electrode on the organic matter was studied. The degradation mechanism is that the organic matter is degraded under the action of direct electrochemical oxidation and indirect electrochemical oxidation, the direct electrochemical oxidation is mainly capable of removing the branched chain on the non-cidin molecule, and the hydroxyl radical generated by the indirect electrochemical oxidation can open the benzene ring, So as to completely mineralize the organic matter. The addition of oxygen can improve the electrochemical oxidation efficiency. The three-dimensional electrode was used to analyze the nine intermediate products of the non-phenacetin by means of the liquid chromatography-mass spectrometry (LC-MS), and the two degradation pathways of the non-siddin electrocatalytic oxidation were estimated. The effect of the current density, the initial pH of the waste water and the amount of aeration on the removal rate of COD was studied by the three-dimensional electrode reactor. Under the optimum parameters, the current density is 10 mA/ cm2, the initial PH of the waste water is 5, the aeration amount is 0.2m3/ h, the COD removal rate can reach 73.4%.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X703

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