本文選題：膜生物反應(yīng)器　切入點：絮凝劑　出處：《浙江工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：通過在膜生物反應(yīng)器(MBR)持續(xù)運行過程中投加聚二甲基二烯丙基氯化銨(PDMDAAC)、聚合氯化鋁(PAC)以及兩者的復(fù)合絮凝劑,分別考察其緩解MBR膜污染的效果。試驗測定MBR的運行周期、活性污泥毛細(xì)管吸水時間(CST)、Zeta電位、污泥體積指數(shù)(SVI)、污泥絮體粒徑分布和胞外聚合物含量等參數(shù)的變化,并觀察反應(yīng)器運行過程中活性污泥變化情況,確定了三種絮凝劑量少最佳的補加劑量和投加方式。試驗結(jié)果表明:通過投加絮凝劑能有效緩解膜污染。三種不同絮凝劑在相同劑量投加時緩解膜污染的效果PDMDAAC最好,復(fù)合絮凝劑次之,PAC效果最差。在補加劑量和投加時間間隔方式的試驗中,PDMDAAC、復(fù)合絮凝劑、PAC都表現(xiàn)出補加劑量比投加方式對緩解膜污染更為有效。依據(jù)試驗中跨膜壓差(TMP)的變化趨勢可確定首加400 mg/L PDMDAAC后,最佳補加劑量為90 mg/L。最佳補加劑量90 mg/L能明顯延長MBR持續(xù)運行周期,是未補加絮凝劑反應(yīng)器運行周期的3.4倍,而PAC的最佳補加劑量是120 mg/L。通過質(zhì)量比6:4復(fù)合PDMDAAC和PAC的復(fù)合絮凝劑不僅能有效緩解膜污染,而且能夠降低由單獨使用PDMDAAC帶來的運行費用。綜合TMP增長趨勢和SVI值變化可確定復(fù)合絮凝劑補加最佳劑量為60 mg/L。投加絮凝劑后,能減小污泥混合液的CST值,增大混合液Zeta電位,降低SVI值和EPS、SMP含量,絮凝劑的投加使活性污泥絮集更緊密,膜組件表面形成的濾餅層變薄,延長MBR恒流量下運行周期。絮凝劑對MBR出水水質(zhì)無明顯影響,投加PDMDAAC的MBR反應(yīng)器對COD、TN的平均去除率分別為93.1%和89.1%,出水的濃度分別在45、5 mg/L以下,達(dá)到一級A排放標(biāo)準(zhǔn)。
[Abstract]:The effects of polydimethyldiallylammonium chloride (PDMDAAC), polyaluminum chloride (PAC) and their composite flocculants on MBR membrane fouling were investigated by adding polydimethyldiallylammonium chloride (PDMDAACN) and their composite flocculants during the continuous operation of the membrane bioreactor (MBR). The operating cycle of MBR was measured. The changes of activated sludge capillary water absorption time, such as Zeta potential, sludge volume index (SVI), particle size distribution of sludge floc and extracellular polymer content, etc., were observed during the operation of the reactor. Three kinds of flocculants with less dosage and optimum dosage were determined. The experimental results showed that the flocculant could effectively alleviate membrane fouling. The effect of three different flocculants on reducing membrane fouling was the best when the same dosage of flocculant was added. In the experiment of adding dosage and time interval, the compound flocculant PAC showed that the dosage of the compound flocculant was more effective than the adding way to mitigate the membrane fouling, according to the transmembrane pressure in the experiment. The variation trend of mg/L can be determined after the first addition of 400 mg/L PDMDAAC. The optimal dosage of 90 mg / L was 90 mg / L. The optimal dosage of 90 mg/L could prolong the continuous running period of MBR obviously, which was 3.4 times of that of the reactor without adding flocculant. The optimum dosage of PAC is 120mg / L. The composite flocculant with 6: 4 mass ratio of PDMDAAC and PAC can not only effectively alleviate the membrane fouling. The optimum dosage of compound flocculant is 60 mg 路L ~ (-1). After adding flocculant, the CST value of sludge mixture can be reduced, and the Zeta potential of mixed sludge can be increased. By reducing the SVI value and the content of SVI, adding flocculant makes the flocculation of activated sludge more compact, and the filter cake layer formed on the surface of membrane module becomes thinner, prolonging the running period under the constant flow rate of MBR. The flocculant has no obvious effect on the effluent quality of MBR. The average removal rate of COD ~ (2 +) TN in MBR reactor with PDMDAAC was 93.1% and 89.1, respectively, and the effluent concentration was below 45 ~ 5 mg/L, which reached the first class A discharge standard.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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相關(guān)期刊論文 前1條

1 曹蕾;張敏健;劉舒華;齊菲;陸繼來;;膜生物反應(yīng)器運行條件對膜污染的影響[J];污染防治技術(shù);2013年05期

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本文編號：1575422