本文選題：自由基 + 紫外光　； 參考：《大連工業(yè)大學(xué)》2015年碩士論文

【摘要】：基于自由基處理難降解有機(jī)廢水是一種效率較高的新型高級氧化技術(shù),近年來受到國內(nèi)外廣泛的關(guān)注。自由基的種類很多(如羥基自由基、硫酸根自由基等),不同的活化方式和反應(yīng)條件對有機(jī)廢水的處理效果也各不相同。在提高有機(jī)廢水的處理效率方面,研究不同的自由基及其活化方法的選擇成為國內(nèi)外研究的熱點(diǎn)方向。本文采用微波、紫外的活化方式,以較為常見的有機(jī)污染物苯酚為處理對象,分析對比反應(yīng)前后的苯酚和COD的濃度變化,研究硫酸根自由基,氯自由基,以及羥基自由基在不同反應(yīng)條件下處理苯酚的降解效果。具體研究內(nèi)容如下:(1)微波輔助活性炭活化過硫酸鹽產(chǎn)生硫酸根自由基降解苯酚,研究結(jié)果表明:在微波功率560 W下,輻射5 mi n,活性炭的投加量為0.17 g,m(K2S2O8)/m(苯酚)=0.5,pH=4時,苯酚的降解效果較好,去除率可達(dá)到86%,COD去除率達(dá)到85%。(2)通過紫外光照次氯酸鹽產(chǎn)生氯自由基降解苯酚,通過改變反應(yīng)條件得出苯酚的優(yōu)化處理?xiàng)l件:在紫外光照射2 h下,加入有效氯為5 g/L的次氯酸鈉溶液,使m(有效氯)/m(苯酚)=0.7,調(diào)節(jié)pH=12,可使苯酚的降解率達(dá)到60%,COD的去除率達(dá)到51%。(3)過碳酸根在紫外光的誘導(dǎo)下產(chǎn)生具有強(qiáng)氧化性的羥基自由基降解苯酚,通過改變光照時間、過碳酸鈉的投加量、pH,得出苯酚降解的優(yōu)化條件:在紫外光照下3 h,加入過碳酸鈉0.035 g,使m(活性氧)/m(苯酚)=1,pH在4~11之間時,苯酚的去除率可達(dá)85%以上,COD的去除率可達(dá)80%以上。在酸性條件下,加入Fe2+,考察紫外光照時間、過碳酸鈉投加量(以活性氧計(jì))、Fe2+投加量以及pH的變化對苯酚去除率的影響。結(jié)果表明:Fe2+的存在加速了苯酚的降解,在紫外光下照射20 min,m(活性氧)/m(苯酚)=0.6,m(Fe2+)/m(苯酚)=0.06,pH=5,苯酚的去除率就可達(dá)到85%。(4)在微波的誘導(dǎo)下,過碳酸根產(chǎn)生羥基自由基降解苯酚。實(shí)驗(yàn)表明:在微波功率800 W下消解3 mi n,加入過碳酸鈉,使m(活性氧)/m(苯酚)=1.6,pH=4~9之間時,苯酚的去除率可達(dá)85%以上,COD的去除率可達(dá)到84%。
[Abstract]:The treatment of refractory organic wastewater based on free radical is a new type of advanced oxidation technology with high efficiency, which has attracted wide attention at home and abroad in recent years.There are many kinds of free radicals (such as hydroxyl radical, sulfate radical and so on). Different activation methods and reaction conditions have different effects on the treatment of organic wastewater.In order to improve the treatment efficiency of organic wastewater, the choice of different free radicals and their activation methods has become a hot research direction at home and abroad.In this paper, microwave and UV activation methods were used to treat phenol, a common organic pollutant. The concentration of phenol and COD were compared before and after the reaction, and the sulphate radical and chlorine free radical were studied.And the degradation effect of phenol treated by hydroxyl radical under different reaction conditions.The specific contents of the study are as follows: microwave-assisted activated carbon activates persulfate to produce sulfate radical to degrade phenol. The results show that when microwave power is 560 W, radiation time is 5 min, the dosage of activated carbon is 0.17 g / m K2S _ 2O _ 8 / m (pH = 4).The degradation efficiency of phenol was better, and the removal rate of COD reached 850.The phenol was degraded by chlorinated hypochlorite by UV irradiation. The optimum treatment conditions of phenol were obtained by changing the reaction conditions: under UV irradiation for 2 h.By adding 5 g / L sodium hypochlorite solution with available chlorine, the degradation rate of phenol can reach 60% and COD removal rate can reach 51% by adding 5 g / L sodium hypochlorite solution. The hydroxyl radical can degrade phenol by hydroxyl radical with strong oxidation ability induced by ultraviolet light.By changing the illumination time and the dosage of sodium percarbonate (pH), the optimum conditions for phenol degradation were obtained: under ultraviolet light irradiation for 3 h, adding sodium percarbonate 0.035 g, the pH value of m (Ros / m) (Phenol) was between 4 ~ 11,The removal rate of phenol can reach more than 85% and the removal rate of COD can reach more than 80%.Under acidic conditions, the effects of UV irradiation time, sodium percarbonate dosage (Fe2 addition by Ros) and pH on phenol removal rate were investigated by adding Fe2.The results showed that the presence of% Fe _ 2 accelerated the degradation of phenol. Under microwave irradiation, hydroxyl radical was produced by percarbonate to produce hydroxyl radical to degrade phenol under the irradiation of 20 min (reactive oxygen species / m (phenol ~ (0.6) / m) Fe ~ (2 +) / m (pH ~ (5)). The removal rate of phenol could reach 85 路L ~ ((4)) under microwave irradiation.The experimental results show that the removal rate of phenol can reach more than 85% and the removal rate of COD can reach 84% when the microwave power is 800W and sodium percarbonate is added.
【學(xué)位授予單位】：大連工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X783

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 許濤,宋國勇;難降解有機(jī)廢水的高級氧化技術(shù)[J];遼寧城鄉(xiāng)環(huán)境科技;2005年03期

2 張汾;;高濃度難降解有機(jī)廢水的治理與控制[J];水處理技術(shù);2007年04期

3 魏奇鋒;張s，

本文編號：1766211