利用复合材料固定微生物降解甲醛废水的应用基础研究
发布时间：2019-06-26 14:23
【摘要】：微生物法降解甲醛废水时,甲醛对微生物具有毒性,会抑制微生物的活性,因此,本文以提高微生物的活性与重复利用率为目的,采用聚乙烯醇(PVA)与海藻酸钠(SA)复合材料对微生物进行固定,并采用固定床反应器和流化床反应器降解甲醛废水,为降解甲醛废水提供一定的实验依据。本研究结论:1、通过对比不添加Na2SO3与添加Na2SO3,考察微生物对甲醛的降解能力和微生物生长能力,结果表明:添加Na2SO3能促进微生物对甲醛的降解;添加Na2SO3能有效的促进微生物的生长,并且使微生物生长稳定期保持七天。2、以凝胶球的传质性能和吸水溶胀率为目标,考察聚乙烯醇(PVA)、海藻酸钠(SA)、活性炭、二氧化钛复合材料浓度范围,结果表明:聚乙烯醇的质量浓度范围为8%-10%、海藻酸钠的质量浓度范围为0.5%-1.5%,活性炭的质量浓度范围为1%-3%,二氧化钛(TiO2)的质量浓度范围为0.5%-1.5%。3、活性炭作为复合材料添加剂时,通过正交实验得到最优复合材料配比为:聚乙烯醇的质量浓度9%,海藻酸钠的质量浓度1.5%,活性炭的质量浓度2%,在最优复合材料配比下测得添加活性炭的凝胶球的传质性能为17.3%。二氧化钛(TiO2)作为复合材料添加剂时,通过正交实验得到最优复合材料配比为:聚乙烯醇质量浓度10%,海藻酸钠质量浓度1%,二氧化钛(TiO2)质量浓度1.5%,在最优复合材料配比下测得添加二氧化钛凝胶球的传质性能为9.5%。4、通过固定化微生物降解液相甲醛实验研究表明:添加活性炭的固定化微生物比添加二氧化钛的固定化微生物降解甲醛的能力更强;固定化微生物的量最佳为50%;对比固定化微生物与游离微生物,对甲醛的降解,固定化微生物的能力强,对pH耐受范围广,对温度的敏感度小。5、对纺织业、制药行业、制革行业工业甲醛废水浓度分别为3000mg/L、5000mg/L和7000mg/L进行降解实验研究,结果表明,固定化微生物对甲醛废水的降解效果显著优于游离态微生物的降解效果。6、通过在固定床反应器和流化床反应器中固定化微生物对甲醛降解影响的探究,结果表明:流化床反应器比固定床反应器对甲醛的降解能力更强,当甲醛被完全降解时,流化床所用时间较少。在流化床反应器中,当固定化微生物与废水的比值为10:50时,处理甲醛的效果较好、成本相对较低。
[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，
本文编号：2506252
[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，
本文编号：2506252
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