發(fā)布時間：2018-07-02 12:45

  本文選題：電-Fenton法 + TNT生產(chǎn)廢水��； 參考：《沈陽理工大學》2017年碩士論文

【摘要】：TNT生產(chǎn)廢水是一種難降解、排量大的有機廢水。本文選用某軍工廠去酸后的生產(chǎn)廢水,以COD和總硝基化合物去除率為指標,使用自行設(shè)計的電解槽為發(fā)生裝置,采用電-Fenton法對其進行降解,作為預處理的方法。主要內(nèi)容如下:通過查閱文獻確定陽極采用鈦鍍釕銥極板,通過研究石墨和鈦兩種陰極材料對TNT生產(chǎn)廢水COD去除率的影響,確定陰極采用鈦極板,此時體系的處理效果穩(wěn)定。通過單因素實驗確定各影響因素的最佳值為:U=6V、CFe~(2+)=1.2mmol/L、nH_2O_2:nFe~(2+)=20:1、C_(Na_2SO_4) = 10g/L、pH=3、曝氣量Q = 300L/h、D = 6cm、反應時間 t = 30min 。在單因素實驗的基礎(chǔ)上,固定反應條件:pH=3、C_(Na_2SO_4)=10g/L、t = 30min,進行了 L16(45)的正交實驗,確定影響水樣降解效果的因素主次水平為極板間距Fe~(2+)的投加量 曝氣量 nH_2O_2:nFe~(2+)電解電壓。根據(jù)正交結(jié)果,確定了反應條件的最優(yōu)組合,經(jīng)驗證性實驗得到COD和總硝基化合物的去除率分別為69.0225%和97.12%。建立了電-Fenton法降解TNT生產(chǎn)廢水的動力學模型,得出該過程符合二級反應動力學,以COD濃度為考察指標,經(jīng)回歸分析得到二級擬合方程為:Ct=(?),相關(guān)系數(shù) R_2 =0.9909推測TNT生產(chǎn)廢水中硝基化合物的降解歷程為:①苯環(huán)上的硝基逐步被還原成羥基:-NO_2→-NO → -NHOH_4→-NH_2→-OH。②苯環(huán)上的甲基逐步被氧化成羥基:-CH_3→CHO→-CH_2OH →-COOH→-OH③苯環(huán)發(fā)生斷鏈反應,生成含有醛基、羧基等長鏈的中間產(chǎn)物,最后降解為H_2O、CO_2及小分子有機物化合物。
[Abstract]:TNT production wastewater is a kind of organic wastewater which is difficult to degrade and have large displacement. In this paper, the wastewater after acid removal in a military factory is used as an indicator of the removal rate of COD and total nitro compounds, using a self designed electrolyzer as a device, and using electrical -Fenton to degrade it as a pretreatment method. The main contents are as follows: through Cha Yuewen The titanium plating ruthenium and iridium plate was used for the determination of the anode, and the effect of the two cathode materials on the removal rate of COD in TNT production wastewater was studied. The titanium plate was used to determine the cathode. The effect of the system was stable at this time. The best values of the factors were determined by the single factor experiment: U=6V, CFe~ (2+) =1.2mmol/L, nH_2O_2:nFe~ (2+) =20:1, C_ (Na_2SO_4). ) = 10g/L, pH=3, aeration Q = 300L/h, D = 6cm, reaction time t = 30min. On the basis of a single factor experiment, a fixed reaction condition: pH=3, C_ (Na_2SO_4) =10g/L, and the orthogonal experiment is carried out to determine the main level of the factors affecting the degradation effect of the water sample. According to the orthogonal results, the optimal combination of reaction conditions was determined. The removal rate of COD and total nitro compounds was 69.0225% and 97.12%. respectively. The kinetic model of -Fenton degradation of TNT wastewater was established by the confirmatory experiment. It was concluded that the process accorded with the two stage reaction kinetics, and the COD concentration was used as the investigation index and the regression analysis was used. The two level fitting equations are as follows: Ct= (?) and the correlation coefficient R_2 =0.9909 speculates that the degradation process of nitro compounds in TNT production wastewater is: (1) the nitro compounds on the benzene ring are gradually reduced to hydroxyl groups: -NO_2, -NO, -NHOH_4, -NH_2 to -OH. (2) methyl gradually oxidize to hydroxyl groups: -CH_3, CHO, -CH_2OH, -CH_2OH, tertiary and benzene ring hair A chain reaction was formed to produce intermediates containing aldehydes and carboxyl groups, and finally degraded into H_2O, CO_2 and small organic compounds.
【學位授予單位】：沈陽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X789

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本文編號：2090168