【摘要】：微生物法降解甲醛廢水時,甲醛對微生物具有毒性,會抑制微生物的活性,因此,本文以提高微生物的活性與重復(fù)利用率為目的,采用聚乙烯醇(PVA)與海藻酸鈉(SA)復(fù)合材料對微生物進行固定,并采用固定床反應(yīng)器和流化床反應(yīng)器降解甲醛廢水,為降解甲醛廢水提供一定的實驗依據(jù)。本研究結(jié)論:1、通過對比不添加Na2SO3與添加Na2SO3,考察微生物對甲醛的降解能力和微生物生長能力,結(jié)果表明:添加Na2SO3能促進微生物對甲醛的降解;添加Na2SO3能有效的促進微生物的生長,并且使微生物生長穩(wěn)定期保持七天。2、以凝膠球的傳質(zhì)性能和吸水溶脹率為目標,考察聚乙烯醇(PVA)、海藻酸鈉(SA)、活性炭、二氧化鈦復(fù)合材料濃度范圍,結(jié)果表明:聚乙烯醇的質(zhì)量濃度范圍為8%-10%、海藻酸鈉的質(zhì)量濃度范圍為0.5%-1.5%,活性炭的質(zhì)量濃度范圍為1%-3%,二氧化鈦(TiO2)的質(zhì)量濃度范圍為0.5%-1.5%。3、活性炭作為復(fù)合材料添加劑時,通過正交實驗得到最優(yōu)復(fù)合材料配比為:聚乙烯醇的質(zhì)量濃度9%,海藻酸鈉的質(zhì)量濃度1.5%,活性炭的質(zhì)量濃度2%,在最優(yōu)復(fù)合材料配比下測得添加活性炭的凝膠球的傳質(zhì)性能為17.3%。二氧化鈦(TiO2)作為復(fù)合材料添加劑時,通過正交實驗得到最優(yōu)復(fù)合材料配比為:聚乙烯醇質(zhì)量濃度10%,海藻酸鈉質(zhì)量濃度1%,二氧化鈦(TiO2)質(zhì)量濃度1.5%,在最優(yōu)復(fù)合材料配比下測得添加二氧化鈦凝膠球的傳質(zhì)性能為9.5%。4、通過固定化微生物降解液相甲醛實驗研究表明:添加活性炭的固定化微生物比添加二氧化鈦的固定化微生物降解甲醛的能力更強;固定化微生物的量最佳為50%;對比固定化微生物與游離微生物,對甲醛的降解,固定化微生物的能力強,對pH耐受范圍廣,對溫度的敏感度小。5、對紡織業(yè)、制藥行業(yè)、制革行業(yè)工業(yè)甲醛廢水濃度分別為3000mg/L、5000mg/L和7000mg/L進行降解實驗研究,結(jié)果表明,固定化微生物對甲醛廢水的降解效果顯著優(yōu)于游離態(tài)微生物的降解效果。6、通過在固定床反應(yīng)器和流化床反應(yīng)器中固定化微生物對甲醛降解影響的探究,結(jié)果表明:流化床反應(yīng)器比固定床反應(yīng)器對甲醛的降解能力更強,當甲醛被完全降解時,流化床所用時間較少。在流化床反應(yīng)器中,當固定化微生物與廢水的比值為10:50時,處理甲醛的效果較好、成本相對較低。
[Abstract]:Formaldehyde is toxic to microorganisms and can inhibit the activity of microorganisms when formaldehyde wastewater is degraded by microbial method. Therefore, in order to improve the activity and reuse efficiency of microorganisms, polyvinyl alcohol (PVA) and sodium alginate (SA) composites were used to fix microorganisms, and fixed bed reactor and fluidized bed reactor were used to degrade formaldehyde wastewater, which provided certain experimental basis for degradation of formaldehyde wastewater. The conclusions of this study are as follows: 1. The degradation ability and microbial growth ability of formaldehyde by microorganisms were investigated by comparing the addition of Na2SO3 and Na2SO3,. The results showed that the addition of Na2SO3 could promote the degradation of formaldehyde by microorganisms. The addition of Na2SO3 can effectively promote the growth of microorganisms and keep the stable growth period of microorganisms for seven days. 2. The concentration range of polyvinyl alcohol (PVA), sodium alginate (SA), activated carbon and titanium dioxide composites was investigated with the goal of mass transfer performance and water absorption swelling rate of gel spheres. The results showed that the mass concentration range of polyvinyl alcohol was 8% 鈮，

本文編號：2506252