本文選題：金屬螯合物　切入點(diǎn)：臭氧　出處：《東北石油大學(xué)》2017年碩士論文

【摘要】：我國腈綸廢水排放量逐年增大,而且國內(nèi)幾乎所有腈綸廢水處理沒有達(dá)標(biāo)而排放到鄰近水域,使高濃度有毒污染物殘留在水體中,通過不斷的遷移、累積對廢水排放地區(qū)的環(huán)境造成了嚴(yán)重破壞。國內(nèi)外對腈綸廢水處理雖然有不少研究,但是僅僅局限于腈綸廢水的處理上,而沒有深入到對腈綸廢水典型污染物的降解研究,從而沒有達(dá)到針對性處理的目的。論文著眼于廢水典型污染物的研究,選出腈綸廢水中比較有代表性的污染物丁二腈作為研究對象,利用金屬螯合物催化臭氧法對丁二腈進(jìn)行氧化,旨在找到一種能高效地氧化丁二腈的高級氧化法,為金屬螯合物催化臭氧法處理腈綸廢水提供技術(shù)支持,對推動臭氧法處理工藝的發(fā)展具有積極意義。論文采用金屬螯合物催化臭氧法氧化丁二腈,利用亞鐵離子催化臭氧產(chǎn)生具有強(qiáng)氧化能力的氧化劑羥基自由基(·OH),對丁二腈進(jìn)行無選擇性地氧化,以期達(dá)到良好的降解效果。論文首先簡述金屬離子催化臭氧理論以及絡(luò)合作用的理論,為后續(xù)實(shí)驗(yàn)研究創(chuàng)建了理論基礎(chǔ)。通過對三種體系氧化丁二腈效能的比較,選擇金屬螯合物催化臭氧體系。隨后選擇金屬螯合物。接著進(jìn)行丁二腈氧化效能的單因素實(shí)驗(yàn)研究和正交實(shí)驗(yàn)研究。最后進(jìn)行可生化性及動力學(xué)研究。研究結(jié)果表明,Fe(II)(焦磷酸鈉)螯合物催化臭氧體系氧化丁二腈效能最好。五種單因素下該體系對丁二腈的氧化效能為:隨著Fe(II)離子濃度、氣相臭氧投加濃度和水力停留時間增加,氧化效能呈由快到慢的上升趨勢;金屬離子協(xié)同作用對氧化效能的影響較小;初始pH值的影響呈持續(xù)增大的趨勢;丁二腈濃度的變化對金屬螯合物催化效能的影響較小。正交實(shí)驗(yàn)分析可知,對于選定的四種影響因素主次順序?yàn)樗νＡ魰r間(HRT)、Fe(II)離子濃度、初始pH值、氣相臭氧投加濃度,HRT、Fe(II)離子濃度對實(shí)驗(yàn)結(jié)果有顯著影響,實(shí)驗(yàn)最佳條件為初始pH值為7、Fe(II)離子濃度為0.2mmol/L、氣相臭氧投加濃度為25~30mg/L、HRT為120min。在最佳條件下對丁二腈進(jìn)行三次平行氧化實(shí)驗(yàn),當(dāng)HRT為120min時,丁二腈的平均去除率為72.4%。丁二腈溶液的可生化性能提高,B/C比值由0.18上升到0.46。此外,金屬螯合物催化臭氧氧化丁二腈符合假一級動力學(xué),初始pH值在1~7范圍內(nèi),綜合反應(yīng)速率常數(shù)在0.00486~0.00869(min)-1之間。
[Abstract]:The discharge of acrylic fiber wastewater in China is increasing year by year, and almost all the domestic acrylic fiber wastewater treatment does not meet the standards and discharge to the adjacent waters, so that high concentration of toxic pollutants remain in the water, through continuous migration,The accumulation caused serious damage to the environment in the waste water discharge area.Although there is a lot of research on the treatment of acrylic fiber wastewater at home and abroad, it is limited to the treatment of acrylic fiber wastewater, but does not go deep into the study of degradation of typical pollutants in acrylic fiber wastewater, thus the purpose of targeted treatment has not been achieved.This paper focuses on the study of typical pollutants in wastewater and selects the representative pollutant succinonitrile in acrylic fiber wastewater as the research object and uses metal chelate to catalyze the oxidation of butadionitrile by ozone method.In order to find an advanced oxidation method which can oxidize succinonitrile efficiently and provide technical support for metal chelate catalytic ozone treatment of acrylic fiber wastewater, it is of positive significance to promote the development of ozone treatment process.In this paper, metal chelates were used to catalyze the oxidation of succinonitrile by ozone, and iron ion was used to catalyze ozone to produce oxidizing oxidant hydroxyl radical (OHN), which was used to oxidize succinonitrile nonselectively, in order to achieve a good degradation effect.Firstly, the theory of metal ion catalyzing ozone and the theory of complexation are briefly introduced, which provides a theoretical basis for further experimental study.The metal chelate catalytic ozone system was selected by comparing the performance of the three systems in the oxidation of succinonitrile.Then the metal chelate was selected.Then the single factor and orthogonal experiments were carried out on the oxidation efficiency of succinonitrile.Finally, the biodegradability and kinetics were studied.The results showed that the oxidation of succinonitrile was the best in the ozone system catalyzed by the chelate (sodium pyrophosphate).The oxidation efficiency of the system is as follows: with the concentration of Fe2 +, the concentration of gas phase ozone and HRT increase, and the oxidation efficiency increases from fast to slow.The effect of metal ion synergism on the oxidation efficiency was small; the effect of initial pH value was increasing; and the catalytic efficiency of metal chelate was less affected by the change of succinonitrile concentration.The orthogonal experiment results show that the primary and secondary order of the four factors are the HRT (HRT) FeII) ion concentration, the initial pH value and the gas phase ozone concentration (HRT) FeII) ion concentration, which have a significant effect on the experimental results.The optimum conditions are as follows: the initial pH value is 7% Fe2) ion concentration is 0.2 mmol / L, and the gas phase ozone concentration is 25 ~ 30 mg / L ~ (-1) HRT = 120 min.Under the optimum conditions, the average removal rate of succinonitrile was 72.4 when HRT was 120min.The biodegradability of succinonitrile solution increased from 0.18 to 0.46.In addition, the metal chelate catalyzed ozone oxidation of butylene nitrile accords with pseudo-first-order kinetics, the initial pH value is in the range of 1 ~ 7, and the comprehensive reaction rate constant is between 0.00486~0.00869(min)-1.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X783.4
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本文編號：1687338