本文選題：腐殖質(zhì) + 剩余污泥��； 參考：《北京建筑大學(xué)》2017年碩士論文

【摘要】：《巴黎氣候協(xié)定》簽署將低碳發(fā)展提升到政治高度。各國隨之出臺一系列碳減排計劃�！疤贾泻汀边\行已成為未來污水處理廠發(fā)展的主要方向。污水處理過程產(chǎn)生的剩余污泥蘊含大量潛在有機能源,而污泥厭氧消化是轉(zhuǎn)化污泥有機質(zhì)為能源的重要途徑。然而,污泥厭氧消化存在著污泥細(xì)胞破壁困難、含難降解木質(zhì)纖維素和腐殖質(zhì)成分等問題,往往導(dǎo)致污泥厭氧消化效率不高。其中,腐殖質(zhì)非但難以生物降解,反而因其結(jié)構(gòu)中羧基、酚羥基與水解酶結(jié)合而可致其它有機物水解效率降低。腐殖質(zhì)結(jié)構(gòu)復(fù)雜,預(yù)處理手段可能難以完全破壞其復(fù)雜結(jié)構(gòu),并不能在根本上消除它對厭氧消化的抑制作用,而原位鈍化腐殖質(zhì)含氧官能團方有可能奏效。腐殖質(zhì)抑制厭氧消化水解程度與解抑制策略取決于腐殖質(zhì)含量與結(jié)構(gòu)特征。為此,本課題分析污泥厭氧消化過程腐殖質(zhì)(胡里酸HA與富里酸FA)含量與結(jié)構(gòu)特征變化,為制定解抑制技術(shù)策略提供研究基礎(chǔ)。實驗首先考察無腐殖質(zhì)人工配水生成剩余污泥(人工配泥)厭氧消化過程中HA與FA含量與結(jié)構(gòu)特征變化。分析結(jié)果顯示,HA與FA厭氧消化前含量為370和190 mg/L,腐殖質(zhì)(HA+FA)占污泥總固體(TS)質(zhì)量分?jǐn)?shù)的2.8%;厭氧消化后兩者分別增加至390和200 mg/L,腐殖質(zhì)占TS質(zhì)量分?jǐn)?shù)增至3.5%。紫外光譜與紅外光譜分析表明,HA與FA厭氧消化后其結(jié)構(gòu)組成中脂肪族化合物減少,而芳香族化合物提高,且FA結(jié)構(gòu)組成中脂肪族化合物有消失跡象。含氧官能團分析揭示,相較厭氧消化前,HA與FA厭氧消化后各自羧基與酚羥基含量均增加;HA與FA在厭氧消化過程羧基與酚羥基含量和均在4.07~5.97 mmol/g范圍之內(nèi)。第二階段實驗分析了實際污水廠污泥厭氧消化過程HA與FA各自含量與結(jié)構(gòu)特征變化。分析結(jié)果顯示,液相中HA與FA含量均得到增加,兩者厭氧消化前含量分別是29和139 mg/L,厭氧消化后增加至43和200 mg/L,分別增加48.3%和43.9%;固相HA與FA含量在厭氧消化過程始終呈現(xiàn)降低趨勢,厭氧消化前分別是1 133和242mg/L,厭氧消化后兩者降低至1 057和143 mg/L,分別減少6.7%和40.9%;系統(tǒng)中腐殖質(zhì)含量(HA+FA)在整個厭氧消化過程亦呈現(xiàn)降低趨勢,由厭氧消化前1 543 mg/L降低至1 443 mg/L,減少6.5%。紫外光譜、紅外光譜、含氧官能團分析表明,HA與FA厭氧消化過程朝著腐殖質(zhì)化程度加深、芳香度提高以及含氧官能團增加方向演變。二維紅外光譜分析揭示,固、液兩相中HA與FA在厭氧消化過程其結(jié)構(gòu)組成中均存在先以脂肪族化合物組分變化,而后羧酸鹽物質(zhì)與多糖組分變化的次序。
[Abstract]:The signing of the Paris Climate Agreement raised low-carbon development to a political level.Countries then issued a series of carbon emission reduction plans.Carbon neutralization has become the main direction of future sewage treatment plant development.The excess sludge produced in the process of sewage treatment contains a large amount of potential organic energy, and anaerobic digestion of sludge is an important way to transform sludge organic matter into energy.However, sludge anaerobic digestion is difficult to break down the wall of sludge cells, and it is difficult to degrade lignocellulose and humus, which often leads to the low efficiency of sludge anaerobic digestion.The humus is difficult to biodegrade, but the hydrolysis efficiency of other organic compounds can be reduced because of the combination of carboxyl group, phenolic hydroxyl group and hydrolase in its structure.The complex structure of humus may not be completely destroyed by pretreatment, and the inhibition of anaerobic digestion can not be eliminated fundamentally. However, the in situ passivation of oxygen-containing functional groups of humus may be effective.The degree of anaerobic digestion and hydrolysis of humus inhibition and the decompression strategy depend on the content and structure of humus.Therefore, the content and structural characteristics of humus (HA and FAA) in sludge anaerobic digestion process were analyzed in this paper.The changes of HA and FA contents and structural characteristics during anaerobic digestion of excess sludge (artificial sludge) produced by artificial water distribution without humus were investigated.The results showed that the contents of HA and FA before anaerobic digestion were 370 mg / L and 190 mg / L, and the content of humus HA / FA was 2.8% of the total solid sludge TSN, and after anaerobic digestion they increased to 390 mg / L and 200 mg / L, respectively, and the ratio of humus to TS increased to 3.5 mg / L.UV and IR spectra showed that the fatty compounds in HA and FA decreased, while the aromatic compounds increased, and the aliphatic compounds in FA showed signs of disappearance after anaerobic digestion.The results of functional group analysis showed that the contents of carboxyl and phenolic hydroxyl in HA and FA increased in the range of 4.07 ~ 5.97 mmol/g during anaerobic digestion.In the second stage, the content and structure characteristics of HA and FA in the anaerobic digestion process of sewage sludge were analyzed.The results showed that the contents of HA and FA in liquid phase were increased.Before anaerobic digestion, the contents of HA and FA were 29 mg / L and 139 mg / L, respectively, and increased to 43 and 200 mg / L after anaerobic digestion, which increased by 48.3% and 43.9%, respectively, while the contents of HA and FA in solid phase decreased during anaerobic digestion.Before anaerobic digestion, it was 1 133 and 242 mg / L, respectively. After anaerobic digestion, both of them decreased to 1 057 and 143 mg / L, which decreased by 6. 7% and 40. 9%, respectively. The humus content and HA FAA in the system also showed a decreasing trend during the whole anaerobic digestion process.From 1 543 mg/L before anaerobic digestion to 1 443 mg / L, a decrease of 6. 5%.Ultraviolet spectrum, infrared spectrum and oxygen functional group analysis showed that the anaerobic digestion process of HA and FA evolved towards humic degree, aromaticity increase and oxygen functional group increasing.Two-dimensional infrared spectroscopy revealed that the structure and composition of HA and FA in both solid and liquid phases changed firstly in the anaerobic digestion process, then in the carboxylate and polysaccharide components.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703

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