本文選題：難降解有機物 + 氯貝酸　； 參考：《西安建筑科技大學》2015年碩士論文

【摘要】：藥品及個人護理品(PPCPs)是環(huán)境中出現(xiàn)的一類微量新型有機污染物,來源廣泛,種類繁多,目前在環(huán)境中存在的濃度特別小,但它們中的大多數在城市污水處理工藝中難以去除,隨著二沉池出水及剩余污泥而排放,使之不斷在環(huán)境中積累,對人類健康及環(huán)境存在著一定的風險。其中氯貝酸(clofibric acid)屬于一類調節(jié)血脂類藥物的代謝產物,具有環(huán)境持久和難降解特性,可作為難降解有機物的代表性物質以研究其在污水處理過程中的遷移轉化規(guī)律。本研究通過建立兩組好氧序批式反應器(SBR)來完成,其中SBR 1用來研究以氯貝酸為難降解有機物代表性物質在活性污泥處理系統(tǒng)中的去除特性及遷移轉化規(guī)律,并探討氯貝酸代謝產物的產生與變化情況;SBR 2作為實驗參比對照,不添加氯貝酸物質。通過對水相及泥相中氯貝酸的分析監(jiān)測表明,活性污泥對氯貝酸吸附作用微弱(僅占約6%),而其生物去除率則在10%~12%之間,大部分氯貝酸隨著處理水而排出系統(tǒng)。通過液相色譜技術對氯貝酸的生物降解產物進行分析,結果表明氯貝酸生物降解過程中產生3種代謝產物:α-羥基異丁酸、乳酸、對氯苯酚。其中,α-羥基異丁酸是氯貝酸生物降解的主要產物,最大濃度約200μg/L左右;其次是乳酸,其最大濃度約70μg/L,這兩種物質在水中均呈現(xiàn)先累積然后被微生物逐漸利用而減少的趨勢;而對氯苯酚的含量最少。對兩組反應器中的活性污泥經高通量測序分析,結果表明優(yōu)勢菌門均為變形菌門(Proteobacteria)、放線菌門(Actinobacteria)、擬桿菌門(Bacteroidetes)。其中放線菌門和擬桿菌門在添加氯貝酸之后,其含量分別由30.57%、28.01%下降為25.07%、24.28%,且此類菌門所包含的菌綱組分比例也有所下降,應該是受到氯貝酸一定程度的抑制所致;而變形菌門在兩組工藝中的分布差別較小。對比兩組反應器中的菌屬組成,在添加氯貝酸的反應器中可發(fā)現(xiàn)一種有別于另一組反應器的Porphyromonadaceae菌屬,該菌屬可能與氯貝酸的生物降解有一定的關系。
[Abstract]:Pharmaceutical and personal care products (PPCPs) are a new class of micro-organic pollutants in the environment. They come from a wide range of sources and have a wide variety of sources. At present, the concentrations in the environment are especially small, but most of them are difficult to remove in municipal wastewater treatment processes. With the discharge of effluent and excess sludge from secondary settling tank, it accumulates in the environment, which has certain risks to human health and environment. Among them, clofibric acid) is a kind of metabolites which regulate blood lipids. It has the characteristics of environmental persistence and refractory degradation, and can be used as the representative substance of refractory organic matter to study its migration and transformation in the process of sewage treatment. In this study, two groups of aerobic sequencing batch reactors (SBRs) were established, in which SBR 1 was used to study the removal characteristics and the migration and transformation laws of chlorobenoic acid in the degradation of representative organic compounds in the activated sludge treatment system. The production and change of chlorobelic acid metabolites were also discussed. SBR2 was used as the experimental reference without adding chlorobenoic acid. The analysis and monitoring of chlorobenzoic acid in water and mud showed that the adsorption of chlorobelic acid by activated sludge was weak (about 6%), but its biological removal rate was between 10% and 12%, and most of chlorobenic acid was discharged with the treatment of water. The biodegradation products of chlorobelic acid were analyzed by liquid chromatography. The results showed that three metabolites were produced in the biodegradation process: 偽 -hydroxyisobutyric acid, lactic acid and p-chlorophenol. Among them, 偽 -hydroxyisobutyric acid is the main product of chlorobenoic acid biodegradation, the maximum concentration is about 200 渭 g / L, the second is lactic acid, the maximum concentration is about 70 渭 g / L, the two substances are accumulated in water and then gradually utilized by microorganisms. The content of p-chlorophenol was the least. The results of high throughput sequencing of activated sludge in two groups of reactors showed that the dominant bacteria were Proteobacteria, Actinobacter teriae and Bacteroidetes. After the addition of chlorobenic acid, the contents of actinomycetes and Bacteroides decreased from 30.57% to 25.07% to 24.28.1%, and the proportion of the bacteria contained in this kind of phylum also decreased, which should be caused by the inhibition of chlorobenic acid to some extent. However, the distribution of Proteus in the two groups was smaller. Comparing the composition of bacteria in two groups of reactors, we can find a Porphyromonadaceae genus in the reactor with chlorobenic acid, which may be related to the biodegradation of chlorobenic acid.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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本文編號：1874059