本文關鍵詞：光催化與生物降解聯(lián)用技術處理偶氮染料廢水的研究　出處：《山東大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 光催化 偶氮染料 剛果紅 生物降解

【摘要】：染料尤其是偶氮染料廢水因其較高的COD、色度以及較低的生物降解性對環(huán)境產生巨大的影響與危害。物理法、化學法和生物法是偶氮染料廢水常用的處理技術,光催化法作為一種先進的高級氧化技術,具有較好的普適性、降解的徹底性、價廉、安全等特點,具有較大的發(fā)展前途,但缺點是處理成本較高。生化法是目前國內外廣泛應用的廢水處理技術,是最經(jīng)濟和環(huán)保的實用廢水處理技術之一。因此,光催化和生化法的聯(lián)用工藝是當前最具開發(fā)潛力的技術之一。在本文中,采用了光催化和生物處理技術聯(lián)用的方法對偶氮染料廢水進行降解,為了增強光催化的效果和解決實際應用中的問題對光催化劑進行了改性和負載,綜合考察了光催化劑的活性、負載以及改性的機理；并對生物反應器的處理效果和生物活性進行了相應的研究。本論文討論了光催化氧化法與生物法結合對偶氮染料廢水處理的可行性,并且在優(yōu)化實驗條件的基礎上,對聯(lián)用工藝處理剛果紅廢水的各項指標進行監(jiān)測與分析,對光催化效果、中間產物；廢水的可生化性、生物降解性；生物活性及其演化等指標的內在聯(lián)系之間進行了初步的研究,并利用光譜分析技術初步探討了聯(lián)用工藝降解偶氮染料的機理,試圖為光催化-生化法對偶氮染料廢水的處理提供一些應用的基礎研究數(shù)據(jù)和依據(jù)。研究結果表明,WO3-La-TiO2/GAC是一種穩(wěn)定高效的復合改性光催化劑：通過改性,促進了光催化劑TiO2由無定形態(tài)向銳鈦礦型的轉化,使其平均粒徑更加均勻穩(wěn)定,并使其比表面積增大,空隙率增大,有效的提高了其光催化效率；在相同體系中,相比未進行改性的Ti02光催化劑,其催化效率提高30%左右；并且該復合催化劑的穩(wěn)定性較好,連續(xù)運行其處理效率未見明顯下降。光催化-生物法聯(lián)用技術應用于偶氮染料廢水的處理中是可行的：光催化作為生物處理的預處理步驟,可以很大程度促進生物對染料的降解程度；該聯(lián)用工藝的脫色率可以達到85%以上,相對于單獨光催化(60%)和生物法(40%)分別高出了25%和45%左右,其COD和氨氮去除率可穩(wěn)定在85%和90%,而單獨生物處理工藝僅能達到70%和75%；結合對生物反應器中微生物狀態(tài)與表現(xiàn)的分析,說明光催化的處理可以降低毒性,有利于生物生長以及生物降解：光譜分析結果說明了光催化通過氧化偶氮破壞偶氮染料分子的大共軛體系,生成以聯(lián)苯和苯環(huán)為主要結構的中間產物,而生物處理再進一步進行降解。
[Abstract]:Dyes, especially azo dye wastewater, have great influence and harm to the environment because of their high COD, low chroma and low biodegradability. Chemical and biological methods are commonly used in the treatment of azo dye wastewater. As an advanced oxidation technology, photocatalysis has the characteristics of good universality, thorough degradation, cheap and safe. Biochemistry is a widely used wastewater treatment technology at home and abroad, and is one of the most economical and environmental protection practical wastewater treatment technology. Photocatalysis and biochemistry process is one of the most promising technologies. In this paper, the photocatalysis and biological treatment were used to degrade azo dye wastewater. In order to enhance the effect of photocatalysis and solve the problems in practical application, the photocatalyst was modified and supported. The activity, loading and modification mechanism of photocatalyst were comprehensively investigated. The treatment effect and biological activity of bioreactor were studied. The feasibility of photocatalytic oxidation combined with bioreactor in treating azo dye wastewater was discussed in this paper. On the basis of optimizing the experimental conditions, the indexes of treating Congo red wastewater by using process were monitored and analyzed, and the photocatalytic effect and intermediate product were analyzed. Biodegradability and biodegradability of wastewater; The intrinsic relationship between bioactivity and its evolution was preliminarily studied and the mechanism of degradation of azo dyes by combined process was discussed by spectroscopic analysis. This paper attempts to provide some basic research data and basis for the treatment of azo dye wastewater by photocatalysis and biochemistry. WO3-La-TiO2/GAC is a stable and efficient composite photocatalyst. By modification, the conversion of photocatalyst TiO2 from amorphous form to anatase type is promoted. The average particle size is more uniform and stable, and the specific surface area is increased, the void ratio is increased, and the photocatalytic efficiency is improved effectively. In the same system, compared with the unmodified Ti02 photocatalyst, the catalytic efficiency is increased by about 30%. The stability of the composite catalyst is good. The treatment efficiency of continuous operation has not decreased obviously. Photocatalysis combined with biological method is feasible in the treatment of azo dye wastewater: photocatalysis is the pretreatment step of biological treatment. It can promote the biodegradation of dyes to a great extent. The decolorization rate of the combined process can reach more than 85%, which is about 25% and 45% higher than that of the photocatalytic method (60) and the biological method (40), respectively. The removal rates of COD and ammonia nitrogen were stable at 85% and 90, but only 70% and 75 by biological treatment alone. Combined with the analysis of the state and performance of microorganisms in the bioreactor, the photocatalytic treatment can reduce the toxicity. In favor of biological growth and biodegradation: the results of spectroscopic analysis show that photocatalytic degradation of azo dye molecules by oxidation of large conjugated system, the formation of biphenyl and benzene ring as the main structure of the intermediate products. The biological treatment was further degraded.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X791

【共引文獻】

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