共查询到16条相似文献,搜索用时 93 毫秒
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生物膜填料塔净化低浓度有机废气研究 总被引:5,自引:0,他引:5
研究了入口 中甲苯浓度,气体流量,液体喷淋量,填料层高度,操作方式等因素对生物膜填料塔净化低浓度甲苯废气性能的影响,研究结果为生化法净化低浓度为机废气的工业应用提供了依据。 相似文献
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采用模拟含氮废水对自行设计制作的A/O生物膜反应器进行脱氮性能研究。研究结果表明:在水温为20~23℃、水力停留时间为18h、进水总氮质量浓度为61~78m g/L、曝气量为25L/min、进水COD分别为110~165m g/L和205~272m g/L的条件下,废水的COD去除率均在90%以上,硝化率分别为98%和95%,总氮去除率分别为50%和78%。采用荧光原位杂交技术对反应器各区域中的硝化细菌进行了检测。结果表明,反应器中的硝化菌主要为亚硝化螺菌属和硝化螺菌属,有少量亚硝化单胞菌属和硝化杆菌属存在。亚硝化菌和硝化菌在好氧区数量相对较多,在缺氧区数量相对较少。 相似文献
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利用自制的活性碳纤维电极-生物膜反应器对低碳氮比(碳元素与氮元素的质量比)废水进行了脱氮实验.实验结果表明:当进水COD和碳氮比较低时,碳氮比和电流密度均对反应器的脱氮性能有很大影响;当碳氮比小于3.0时,出水的ρ(NO3--N)随进水碳氮比的增大而减小;当进水COD为70 mg/L,ρ( NO3--N)为35 mg/L、碳氮比为2.0、电流密度为0.025 mA/cm2、反应时间为8h时,出水的ρ(NO3--N)达到最低值11.2 mg/L,NO3--N去除率为68.0%.在适宜的碳氮比条件下,电极-生物膜反应器具有显著的强化脱氮作用,其对NO3--N的去除率与单纯生物膜反应器相比可提高6.0~15.0个百分点.保持碳氮比不变,提高进水COD会导致所需电流密度的提高和脱氮能力的下降. 相似文献
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改性填料对移动床生物膜反应器性能的影响 总被引:1,自引:0,他引:1
分别选取3种不同柱状悬浮填料,采用两级好氧移动床生物膜反应器处理低浓度化工废水。实验结果表明,在平均有机负荷为1.67 kg/(m~3·d)、废水pH为7.5~7.8、温度为32~33℃、HRT为8 h、第一级反应器DO为0.5~1.0 mg/L、第二级反应器DO为1.5~2.0 mg/L的条件下,A型悬浮填料(添加改性剂和微量元素、φ10 mm×10 mm)、B型悬浮填料(添加改性剂和微量元素、φ25 mm×10 mm)和C型悬浮填料(无添加剂、φ10 mm×10 mm)的COD平均去除率分别为82.2%、81.8%和70.6%。 相似文献
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Biodegradation is an attractive approach for the elimination of synthetic polymers, pervasively accumulated in natural environments and generating ecological problems. The present work investigated the degradation of low‐density polyethylene (PE) by three Bacillus sp., that is, ISJ36, ISJ38, and ISJ40. The degree of biodegradation was assessed by measuring hydrophobicity, viability, and total protein content of bacterial biofilm attached to the PE surface. Although all three bacterial strains were able to establish an active biofilm community on the PE surface, ISJ40 showed better affinity toward PE degradation than the other two. Bacterial colonization and physical changes on the PE surface were visualized by scanning electron microscopy. Fourier transform infrared spectroscopy analysis revealed alteration in the intensities of functional groups along with an increase in the carbonyl bond indexes. The study results suggest that the Bacillus strain ISJ40 can be used as a potential degrader for the eco‐friendly treatment of PE waste. 相似文献
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Maria Swiontek Brzezinska Maciej Walczak Urszula Jankiewicz Marcela Pejchalová 《Journal of Polymers and the Environment》2018,26(2):589-595
The research was aimed at determining the abundance of biofilm formation by Escherichia coli and Staphylococcus aureus on the surface of polycaprolactone (PCL) with polyhexamethylene guanidine (PHMG) derivatives and effect of the derivatives on extracellular hydrolytic enzymes and intracellular dehydrogenases. Biofilm abundance was determined by spectrophotometry, using crystal violet staining. Hydrolytic enzymes after contact with the film were determined with the use of non-specific substrate—fluorscein diacetate. The effect of PHMG derivatives on dehydrogenases activity was assessed using the test, where triphenyltetrazolium chloride (TTC) is reduced to triphenylformazan (TF). The PCL containing PHMG granular polyethylene wax and salt of sulfanilic acid (0.6–1% wt.) strongest inhibited biofilm formation. PHMG derivatives introduced into PCL were found to slightly affect hydrolases activity in both E. coli and S. aureus at a concentration of 0.2 and 0.6%. It was also found that dehydrogenases activity was inhibited by PCL films containing PHMG derivatives. PCL containing 1% of PHMG sulfanilate strongest inhibited hydrolases activity, whereas PCL modified with 1% of PHMG granular polyethylene wax showed the highest inhibitory effect on the activity of both enzymes. W-PCL and A-PCL composites (at concentration of 0.6%) have optimal combination of antibiofilm activity and biodegradability. 相似文献
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生物滴滤塔处理甲苯废气 总被引:2,自引:0,他引:2
分别以生物陶粒和聚氨酯泡沫为生物滴滤塔填料,对甲苯废气进行处理,考察不同生物滴滤塔挂膜启动时间以及气体流量和甲苯质量浓度条件下生物滴滤塔对甲苯废气的去除效果。实验结果表明:生物陶粒为填料的生物滴滤塔所需要的挂膜启动时间更短;在气体流量为450L/h时,以生物陶粒为填料的生物滴滤塔甲苯去除率稳定在72%左右,聚氨酯泡沫为填料时甲苯去除率稳定在65%左右。以聚氨酯泡沫为填料时,随甲苯质量浓度提高,甲苯去除率下降幅度较小,甲苯质量浓度为1.80g/m3时,甲苯去除率仍在72%以上。 相似文献
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采用混凝—A/O生物膜法处理乳液聚合ABS树脂生产废水,确定了混凝预处理工序PAC和PAM的投加量,考察了混合液回流比(R)和A/O段总水力停留时间(HRT)对废水中COD,NH_4~+-N,SS,TN等污染物去除效果的影响。实验结果表明,在HRT为18~24 h、R为2~3的工艺条件下,A/O生物膜法好氧段发生了同步硝化反硝化反应,废水经处理后,出水COD小于60.0 mg/L,ρ(NH_4~+-N)小于5.0 mg/L,TN小于15.0 mg/L,达到了GB 31570—2015《石油炼制工业污染物排放标准》的要求。 相似文献