本文選題：木材 + 染色廢水��； 參考：《中南林業(yè)科技大學》2017年碩士論文

【摘要】：木材染色是低質木材增值有效方法之一。木材染色屬于木材化學加工范疇,生產(chǎn)過程中產(chǎn)生大量的廢水已經(jīng)成為木材加工工業(yè)的污染源頭之一,廢水中含有大量的有機污染物,致使化學需氧量高,色度大,成分復雜且具有致癌、致畸、致基因突變等危害,嚴重威脅人類健康和生態(tài)環(huán)境。因此木材染色廢水必須經(jīng)過處理使其達標排放是迫切解決的問題�；谶^氧化物處理的高級氧化技術具有氧化能力強、無選擇性、反應速度快、處理效果好等優(yōu)點,Fe~(2+)催化H_2O_2產(chǎn)生·OH以及以熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)都能夠快速的氧化降解廢水中的難降解有機污染物,是印染工業(yè)廢水處理常用的氧化處理方法之一,但目前應用于木材加工工業(yè)廢水的深度處理鮮有報道。因此,本研究以木材活性染料染色廢水為研究對象,探討兩種不同自由基的氧化降解工藝。并借助UV-Vis,HPLC,FTIR and Raman spectra等手段,深入分析研究熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)氧化木材活性染料染色廢水的降解機理。主要研究內容如下:(1)以Fe~(2+)催化H_2O_2產(chǎn)生羥基自由基處理木材活性染料染色廢水,研究結果表明,各影響因素從大到小的影響順序為pH值氧化劑H_2O_2投加量反應溫度反應時間硫酸亞鐵濃度。優(yōu)化工藝條件為30%H_2O_2投加濃度為7.5ml/L、FeSO_4·7H_2O為0.9g/L、處理液初始pH值為2.5、反應溫度為50℃、反應時間為80min。在此優(yōu)化條件下化學需氧量和色度去除率分別達90.5%和99.99%。(2)以熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)處理木材活性染料染色廢水,結果表明,化學需氧量去除率都是先隨溫度的升高、Na_2S_2O_8投加量的增大、反應時間的延長而升高,分別到達90℃、50g/L、150min后CODCr去除率保持不變;初始pH值對CODCr去除率影響不明顯。得到優(yōu)化工藝條件為反應溫度90℃,Na_2S_2O_8投加量50g/L,反應時間150min,初始pH不調,在此處理工藝條件下,CODCr去除率達到91.06%。(3)利用響應面分析進一步優(yōu)化熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)處理工藝,得到的最優(yōu)工藝參數(shù)為反應溫度為90℃,Na_2S_2O_8投加入量為51.3g/L,反應時間為2.00h,初始pH不調,處理后染色廢水CODCr平均去除率為98.36%,TN平均去除率為89.33%,苯胺類平均去除率為95.64%。(4)基于熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)深度氧化木材活性染料染色廢水,采用UV-Vis,HPLC,FTIR and Raman spectra探討氧化機理。結果表明,熱活化Na_2S_2O_8產(chǎn)生SO_4~(-·)可以使廢水中染料分子結構中的共軛發(fā)色基團-N=N-鍵發(fā)生斷裂,同時使苯環(huán)和萘環(huán)發(fā)生開環(huán)反應,從而使廢水脫色,且萘環(huán)的降解速率比苯環(huán)的降解速率要高,并且-N=N-鍵氧化降解速率符合一級反應動力學方程,速率常數(shù)為0.033 min-1,反應活化能Ea為29.22 kJ/mol。
[Abstract]:Wood dyeing is one of the effective methods to increase the value of low quality wood. Wood dyeing belongs to the category of wood chemical processing. A large amount of wastewater produced in the production process has become one of the sources of pollution in the wood processing industry. The waste water contains a large number of organic pollutants, resulting in high chemical oxygen demand and large chroma. The composition is complex and has the hazard of carcinogenesis, teratogenicity and gene mutation, which is a serious threat to human health and ecological environment. Therefore, it is urgent to solve the problem that wood dyeing wastewater must be treated to meet the discharge standards. The advanced oxidation technology based on peroxide treatment has the advantages of strong oxidation ability, non-selectivity and fast reaction rate. It is one of the commonly used oxidation treatment methods for printing and dyeing wastewater to catalyze the production of OH from H_2O_2 and from thermal activated Na_2S_2O_8 to produce so _ 4 / C _ 4), which can rapidly oxidize and degrade the refractory organic pollutants in the wastewater. However, there are few reports on advanced treatment of wastewater from wood processing industry. Therefore, in this study, two kinds of free radical oxidation and degradation processes were studied with wood reactive dyestuff wastewater as the research object. By means of UV-Vis-HPLCX FTIR and Raman spectra, the degradation mechanism of oxidized wood dyeing wastewater produced by heat-activated Na_2S_2O_8 was studied. The main research contents are as follows: (1) Fe~(2) H_2O_2 was used to produce hydroxyl radical to treat wood dyeing wastewater. The order of influencing factors from big to small is pH value oxidant H_2O_2 dosage, reaction temperature, reaction time, ferrous sulfate concentration. The optimum conditions were as follows: the concentration of 30%H_2O_2 was 7.5 ml / L, the concentration of FeSOs was 0.9g / L, the initial pH value was 2.5, the reaction temperature was 50 鈩，

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