本文選題：高鐵酸鹽 + Fenton　； 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)、社會(huì)、科學(xué)技術(shù)的迅猛發(fā)展,以及人民生活水平的逐步提高,水環(huán)境的污染問題也日趨嚴(yán)重。焦化廢水是一類難降解的有機(jī)廢水,多環(huán)芳烴是其中一類典型的有機(jī)污染物,具有可生化性低、生物毒性高,且致畸、致癌、致突變的性質(zhì),因其化學(xué)穩(wěn)定性較高,故在自然界中不易被降解,很可能通過食物鏈的形式進(jìn)入生物體內(nèi),對(duì)人類的發(fā)展產(chǎn)生嚴(yán)重的危害。除此之外,焦化廢水中還含有大量懸浮的原煤和焦煤顆粒,這種小粒度的懸浮顆粒沉降性能較差,為焦化廢水的凈化處理帶來了一定的麻煩。本文嘗試將高鐵酸鹽氧化法與Fenton氧化法聯(lián)用,以菲作為研究對(duì)象,探索了高鐵酸鹽-Fenton聯(lián)合氧化法氧化降解菲的最佳反應(yīng)條件及其降解效果,隨后探究了高鐵酸鹽-Fenton聯(lián)合氧化法對(duì)水溶液中懸浮煤顆粒的絮凝效果,并考察了此方法對(duì)實(shí)際焦化廢水的處理效果,為實(shí)際焦化廢水的處理拓展了思路。首先利用單因素實(shí)驗(yàn)探索了高鐵酸鹽氧化法對(duì)菲的氧化降解。結(jié)果表明,高鐵酸鉀與菲的反應(yīng)在100 s后就已基本結(jié)束,且pH為中性時(shí),高鐵酸鉀對(duì)菲的氧化效果最好。溫度對(duì)反應(yīng)的影響不大,溫度的升高有助于高鐵酸鉀對(duì)菲的降解率和反應(yīng)速率的提升。通過改變反應(yīng)物濃度發(fā)現(xiàn),高鐵酸鉀濃度與菲降解率呈現(xiàn)正相關(guān)趨勢(shì),高鐵酸鉀濃度的增加能夠有效推動(dòng)反應(yīng)的進(jìn)行,而菲初始濃度對(duì)反應(yīng)的影響卻很小,隨著菲初始濃度的增加,菲的降解率及反應(yīng)速率有輕微的下降。通過對(duì)反應(yīng)動(dòng)力學(xué)的研究發(fā)現(xiàn),當(dāng)高鐵酸鉀或菲初始濃度過量時(shí),高鐵酸鉀對(duì)菲的降解過程符合假一級(jí)反應(yīng)動(dòng)力學(xué)。在單因素實(shí)驗(yàn)結(jié)果的基礎(chǔ)上,設(shè)計(jì)了高鐵酸鹽-fenton聯(lián)合氧化法降解菲的正交試驗(yàn)。結(jié)合成本因素,高鐵酸鹽-fenton聯(lián)合氧化法降解菲的最佳條件為:初始溶液ph=5、K_2FeO_4反應(yīng)時(shí)間為40s、后續(xù)fenton反應(yīng)時(shí)間為15min,試劑投加比例為:phe:K_2FeO_4(n/n)=3:1,phe:H_2O_2(n/n)=1:2。通過對(duì)fenton試劑硫酸亞鐵投加量的研究發(fā)現(xiàn),過量的硫酸亞鐵會(huì)導(dǎo)致菲降解率的下降,而從經(jīng)濟(jì)方面考慮,硫酸亞鐵的投加并不是必要的。測(cè)定反應(yīng)過程中的toc可知,在本實(shí)驗(yàn)濃度范圍內(nèi),對(duì)菲的完全降解并未能得以實(shí)現(xiàn)。對(duì)比高鐵酸鹽氧化法、fenton氧化法和高鐵酸鹽-fenton聯(lián)合氧化法發(fā)現(xiàn),高鐵酸鹽-fenton聯(lián)合氧化法有著明顯的優(yōu)勢(shì)。通過對(duì)煤顆粒表面zeta電位的測(cè)定,研究高鐵酸鹽-fenton聯(lián)合氧化法對(duì)煤顆粒絮凝沉降的影響。結(jié)果表明,煤顆粒表面帶負(fù)電,降低溶液ph有利于降低煤顆粒表面zeta電位的絕對(duì)值。高鐵酸鉀在中性溶液中對(duì)煤顆粒表面zeta電位的影響較為明顯,隨著高鐵酸鉀投加量的增加,煤顆粒表面zeta電位的絕對(duì)值先降低后升高。在本實(shí)驗(yàn)濃度范圍內(nèi),無機(jī)陽離子的適量加入能夠改善煤顆粒的沉降性能。過氧化氫的加入可以與高鐵酸鉀形成優(yōu)勢(shì)互補(bǔ),說明高鐵酸鹽-Fenton聯(lián)合氧化法能夠起到促進(jìn)煤顆粒沉降的效果。最后,考察了高鐵酸鹽-Fenton聯(lián)合氧化法對(duì)實(shí)際焦化廢水的處理效果。結(jié)果表明,當(dāng)pH為5、高鐵酸鉀投加量為6 mmol/L、反應(yīng)時(shí)間為40 s、Fenton試劑過氧化氫與高鐵酸鉀的摩爾比為6:1、反應(yīng)時(shí)間為15 min時(shí),高鐵酸鹽-Fenton聯(lián)合氧化法對(duì)實(shí)際焦化廢水的處理效果最好,此時(shí),COD、氨氮、SS的去除率分別達(dá)到了69.27%、75.95%和89.81%。將處理過的水樣與原水樣相比發(fā)現(xiàn),高鐵酸鹽-Fenton聯(lián)合氧化法也會(huì)對(duì)焦化廢水起到較好的脫色作用。
[Abstract]:With the rapid development of economy, society, science and technology and the gradual improvement of people's living standards, the pollution of water environment is becoming more and more serious. The coking wastewater is a kind of refractory organic wastewater. Polycyclic aromatic hydrocarbons are one of the typical organic pollutants, which have low biodegradability, high biological toxicity, teratogenic, carcinogenic and mutagenicity. Because of its high chemical stability, its chemical stability is not easy to be degraded in nature, it is likely to enter the organism through the form of food chain, causing serious harm to human development. In addition, the coking wastewater also contains a large number of suspended raw coal and coking coal particles, and the small particle size of suspended particles has poor settling performance, which is a coking wastewater. This paper attempts to combine the ferrate oxidation method with the Fenton oxidation process and the phenanthrene as the research object, to explore the optimal reaction conditions and degradation effect of the oxidation degradation of phenanthrene by the combined oxidation of ferrate -Fenton, and then explore the combined oxidation of ferrate -Fenton for the suspension of coal in aqueous solution. The effect of the flocculation of the particle on the treatment of the actual coking wastewater was investigated and the thought of the treatment of the actual coking wastewater was expanded. First, the oxidation degradation of phenanthrene by the ferrate oxidation method was explored by single factor experiment. The results showed that the reaction of potassium ferrate to phenanthrene was basically finished after 100 s, and when pH was neutral, high iron was found. The effect of potassium on the oxidation of phenanthrene is the best. Temperature has little effect on the reaction. The increase of temperature can help potassium ferrate to improve the degradation rate and reaction rate of phenanthrene. By changing the concentration of the reactant, it is found that the concentration of potassium ferrate has a positive correlation with the phenanthrene degradation rate, and the increase of the concentration of potassium ferrate can effectively promote the reaction. The effect of the initial concentration of phenanthrene on the reaction was very small. With the increase of the initial concentration of the phenanthrene, the degradation rate and reaction rate of phenanthrene decreased slightly. Through the study of the reaction kinetics, it was found that when the initial concentration of potassium ferrate or phenanthrene was excessive, the degradation process of the phenanthrene accorded with the pseudo first order reaction kinetics. In the single factor experiment results. On the basis of this, the orthogonal experiment of phenanthrene degradation by ferrate -fenton combined oxidation method was designed. Combined with cost factors, the best conditions for the degradation of phenanthrene by the combined oxidation of ferrate -fenton were ph=5, the reaction time of K_2FeO_4 was 40s, the subsequent Fenton reaction time was 15min, and the ratio of the reagent to the reagent was phe:K_2FeO_4 (n/n) =3:1, phe:H_2O_2 (n/n). Through the study of the dosage of Fenton reagent ferrous sulfate, it is found that excessive ferrous sulfate can lead to the decline of phenanthrene degradation rate, and from the economic consideration, the addition of ferrous sulfate is not necessary. The determination of TOC in the reaction process shows that the complete degradation of phenanthrene can not be realized in the concentration range of the experiment. The oxidation method, Fenton oxidation and the combined oxidation of ferrate -fenton have found that the combined oxidation of ferrate -fenton has obvious advantages. By measuring the surface zeta potential of coal particles, the effect of the combined oxidation of ferrate -fenton on the flocculation and settlement of coal particles is studied. The results show that the surface of the coal particles is negatively charged, and the pH of the solution is reduced. The absolute value of the zeta potential on the surface of coal particles is reduced. The effect of Potassium Ferrate on the surface zeta potential of coal particles in neutral solution is more obvious. With the increase of the dosage of potassium ferrate, the absolute value of the zeta potential on the surface of coal particles first decreases and then increases. In the concentration range of this experiment, the amount of inorganic cations can improve the coal particle. The addition of hydrogen peroxide can complementation with potassium ferrate, which indicates that the combined oxidation of ferrate -Fenton can promote the settlement of coal particles. Finally, the treatment effect of the combined oxidation of ferrate -Fenton on the actual coking wastewater is investigated. The results show that when pH is 5, the dosage of potassium ferrate is 6. Mmol/L, the reaction time is 40 s, the molar ratio of Fenton reagent hydrogen peroxide and potassium ferrate is 6:1, the reaction time is 15 min, and the combination of ferrate -Fenton oxidation method is the best for the treatment of the actual coking wastewater. At this time, the removal rate of COD, ammonia nitrogen and SS reached 69.27%, 75.95% and 89.81%. compared with the original water samples. Now, ferrate -Fenton combined oxidation will also play a better role in decolorizing coking wastewater.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X784

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