本文選題：含酚廢水 + UASB��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：本論文研究了萃取劑甲基異丁基(甲)酮(MIBK)、氨氮以及鳥糞石沉淀、高酚沖擊等因素對含酚廢水厭氧處理效能的影響,并通過分析污泥的比產(chǎn)甲烷活性、酚降解活性、粒度大小、污泥比阻等性質(zhì),揭示上述各因素對厭氧處理效能產(chǎn)生影響的作用機制,并得到如下的結(jié)果:(1)當(dāng)進水總酚濃度為1000 mg·L~(-1)時,UASB出水總酚濃度約為0.22mg·L~(-1),且COD去除率大于97%。當(dāng)進水中含有0.1 g·L~(-1) MIBK時,UASB反應(yīng)器對酚類污染物的去除效能未受影響。但是,當(dāng)進水MIBK濃度增至10 g·L~(-1)時,UASB反應(yīng)器的總酚去除效率下降了1-2%。然而,厭氧污泥的比產(chǎn)甲烷活性卻下降了45-75%。通過對MIBK厭氧降解性能的分析,發(fā)現(xiàn)其厭氧降解速率符合偽一級動力學(xué)方程(MIBK初始濃度為35 mg·L~(-1),k=0.0115 h~(-1),R~2=0.9664)。此外,在MIBK濃度分別為0.1,0.5,5和10 g·L~(-1)的條件下,MIBK的相對產(chǎn)甲烷速率常數(shù)分別為0.00816,0.00613,0.00273和0.00207 d-1。相較于苯酚降解速率,高濃度MIBK會短時抑制污泥的產(chǎn)甲烷活性。(2)當(dāng)進水氨氮濃度為0.23,1,3 g·L~(-1)時,UASB反應(yīng)器對總酚和COD的去除效率均維持在99.90%左右,厭氧污泥的活性未受到氨氮的顯著影響。但是,當(dāng)氨氮濃度提高至5 g·L~(-1)時,總酚和COD去除率分別下降了55%、12%。此時,污泥的產(chǎn)甲烷活性下降了72%。當(dāng)氨氮濃度達到10 g·L~(-1),厭氧反應(yīng)器的總酚去除率接近零,COD去除率僅為50%左右。采用鳥糞石沉淀法降低進水氨氮濃度,結(jié)合正交試驗和反應(yīng)器運行條件,確定當(dāng)氨氮濃度為10 g·L~(-1)時,鳥糞石沉淀法去除氨氮的最優(yōu)條件為:pH=8.5、n(Mg~(2+)):n(NH_4~+):n(PO_4~(3-))=1:1:1。在鳥糞石沉淀預(yù)處理與厭氧工藝組合運行條件下,總酚去除率恢復(fù)至60-80%。(3)當(dāng)進水苯酚濃度達到1,2,4 g·L~(-1)時,UASB反應(yīng)器對苯酚和COD的去除率分別維持在95%和90%以上。當(dāng)進水苯酚濃度達到8 g·L~(-1)時,UASB反應(yīng)器出水苯酚濃度快速上升至4.63 g·L~(-1),且污泥的比產(chǎn)甲烷活性受到嚴重抑制。
[Abstract]:In this paper, the effects of the extraction agents, such as methyl isobutyl (methyl) ketone MIBK, ammonia nitrogen, bird dung stone precipitation and high phenol impact on the anaerobic treatment efficiency of phenol containing wastewater were studied, and the specific methanogenic activity, phenol degradation activity and particle size of sludge were analyzed. The effects of the above factors on anaerobic treatment efficiency are revealed. The results are as follows: 1) when the influent total phenol concentration is 1000 mg / L ~ (-1), the total phenol concentration is about 0.22mg L ~ (1) ~ (-1), and the removal rate of COD is more than 97%. The removal efficiency of phenolic pollutants by UASB reactor was not affected when the influent contained 0.1 g L ~ (-1) MIBK. However, when the influent concentration of MIBK increased to 10 g / L ~ (-1), the removal efficiency of total phenol decreased by 1 ~ 2%. However, the specific methanogenic activity of anaerobic sludge decreased by 45-75. By analyzing the anaerobic degradation performance of MIBK, it is found that the rate of anaerobic degradation accords with the pseudo-first-order kinetic equation that the initial concentration of MIBK is 35 mg / L ~ (-1) ~ 0.0115 h ~ (-1) ~ 0.9664 ~ (-1). In addition, the relative methanogenic rate constants of MIBK were 0.00816 ~ 0.00613 ~ 0.00273 and 0.00207 d ~ (-1) under MIBK concentration of 0.1g / L ~ (-5) and 10 g / L ~ (-1), respectively. Compared with the degradation rate of phenol, high concentration of MIBK could inhibit the methanogenic activity of sludge for a short time. The removal efficiency of total phenol and COD was about 99.90% when the influent ammonia nitrogen concentration was 0.23 ~ 1g / L ~ (-1). The activity of anaerobic sludge was not significantly affected by ammonia nitrogen. However, when the concentration of ammonia nitrogen increased to 5 g / L ~ (-1), the removal rates of total phenol and COD decreased by 55 / 12 and 55 / 12, respectively. At this time, the methanogenic activity of sludge decreased by 72%. The removal rate of total phenol in anaerobic reactor is only about 50% when the concentration of ammonia nitrogen reaches 10 g / L ~ (-1). The method of bird dung stone precipitation was used to reduce the influent ammonia nitrogen concentration. In combination with the orthogonal test and the operating conditions of the reactor, it was determined that when the ammonia nitrogen concentration was 10 g / L ~ 1), the optimum conditions for removal of ammonia nitrogen by the bird dung stone precipitation method were as follows: (1) pH = 8.5% (n = 10). The optimum conditions for removal of ammonia nitrogen by the method were as follows: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1. Under the combined operation conditions of gustonite precipitation pretreatment and anaerobic process, the removal rate of total phenol returned to 60-80%. 3) when the influent phenol concentration reached 1 ~ 2 ~ 2 ~ 4 g / L ~ (-1), the removal efficiency of phenol and COD in UASB reactor was over 95% and 90%, respectively. When the influent phenol concentration reached 8 g / L ~ (-1), the effluent phenol concentration of UASB reactor increased rapidly to 4.63 g / L ~ (-1), and the specific methanogenic activity of sludge was severely inhibited.
【學(xué)位授予單位】：合肥工業(yè)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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