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Performances of biological aerated filter employing hollow fiber membrane segments of surface-improved poly (sulfone) as biofilm carriers 总被引:2,自引:0,他引:2
SHEN Ying-jie WU Guang-xi FAN Yao-bo ZHONG Hui WU Lin-lin ZHANG Shao-lai ZHAO Xian-hong ZHANG Wei-jun 《环境科学学报(英文版)》2007,19(7):811-817
Using the surface of poly (sulfone) hollow fiber membrane segments as grafted layer, the hydrophilic acrylamide chain was grafted on by UV-photoinduced grafting polymerization. The gained improvement of surface wettability for the modified membrane was tested by measuring the contact-angle as well as FTIR spectra. Then correlation between the hydrophilic ability of support material and the biofilm adherence ability was demonstrated by comparing the pollutant removal rates from urban wastewater via two identical lab-scale up-flow biological aerated filters, one employed the surface wettability modified poly (sulfone) hollow fiber membrane segment as biofilm carder and the other employed unmodified membrane segment as biofilm carder. The experimental results showed that under the conditions of influent flux 5 L/h, hydraulic retention time 9 h and gas to liquid ratio (G/L) 10: 1, the removal rates of chemical oxygen demand (COD) and ammonium nitrogen (NH4^+-N) for the modified packing filter and the unmodified packing filter was averaged at 83.64% and 96.25%, respectively, with the former filter being 5%-20% more than the latter. The effluent concentration of COD, NH4^+-N and turbidity for the modified packing filter was 25.25 mg/L, 2 mg/L and 8 NTU, respectively. Moreover, the ammonium nitrogen removal performance of the filter packing the modified PSF was compared with the other bioreactor packing of an efficient floating medium. The biomass test indicated that the modified membrane matrixes provided better specific adhesion (3310-5653 mg TSS/L support), which gave a mean of 1000 mg TSS/L more than the unmodified membrane did. In addition, the phenomenon of simultaneous denitrification on the inner surface of the support and nitrification on the outer surface was found in this work. 相似文献
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为了研究竹炭及其改性产品在污水处理中作为微生物载体的可行性,在曝气生物滤池工艺中研究了竹炭及其改性产品(硝酸改性、双氧水改性和超声改性竹炭)对污染物(COD及NH4+-N)的处理效果。结果表明,超声改性竹炭的处理效果最好,对COD及NH4+-N去除率分别达93.34%和50.94%,而其他改性竹炭的处理效果无显著提高。基于PLFA技术分析各载体上的微生物群落结构,结果表明,所有载体上的微生物均以真核和好氧原核生物为主,超声改性竹炭上的生物量高于其他填料且厌氧细菌数量最多。此外,基于碘吸附值和SEM技术分别对改性竹炭的吸附性能和形貌进行分析发现,超声改性竹炭上的微孔数量增加,孔壁更为粗糙。因此,超声改性竹炭这种生物质新材料有望成为优良的水处理微生物载体。 相似文献
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以亲水化改性聚氨酯为多孔载体的生物膜移动床反应器处理污水中试研究 总被引:3,自引:1,他引:2
载体是生物膜移动术反应器(MBBR)工艺的关键影响因素,利用亲水化改性聚氨酯载体构建MBBR,用于城市污水的中试研究.反应器日处理能力为3~3.5 t.d-1,水力停留时间为7~8 h,在连续进水(进水COD 140~280 mg.L-1,NH4+-N 30~50 mg.L-1,总氮45~65 mg.L-1,总磷2.5~4.0 mg.L-1)条件下对改性载体的挂膜速度、有机物和氮的去除效果及不同温度下的污水处理特性进行了研究.140 d的试验结果表明在24~28℃时,载体上生物膜在6 d左右即可完成挂膜,并达到稳定的处理效果.COD、NH4+-N、TN和TP的平均去除率分别为70%、97%、70%和39%.随着水温逐渐降低到12℃左右,NH4+-N的去除率依然能达到97%,表明通过添加改性载体可以提高反应器低温条件下的硝化能力. 相似文献
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Yonglei Wang Baozhen Liu Kefeng Zhang Yongjian Liu Xuexin Xu Junqi Jia 《Frontiers of Environmental Science & Engineering》2018,12(5):5
Biofilm is an effective simultaneous denitrification and in situ sludge reduction system, and the characteristics of different biofilm carrier have important implications for biofilm growth and in situ sludge reduction. In this study, the performance and mechanism of in situ sludge reduction were compared between FSC-SBBR and SC-SBBR with constructed by composite floating spherical carriers (FSC) and multi-faceted polyethylene suspension carriers (SC), respectively. The variation of EPS concentration indicated that the biofilm formation of FSC was faster than SC. Compared with SCSBBR, the FSC-SBBR yielded 0.16 g MLSS/g COD, almost 27.27% less sludge. The average removal rates of COD and NH4+-N were 93.39% and 96.66%, respectively, which were 5.21% and 1.43% higher than the average removal rate of SC-SBBR. Investigation of the mechanisms of sludge reduction revealed that, energy uncoupling metabolism and sludge decay were the main factors for sludge reduction inducing 43.13% and 49.65% less sludge, respectively, in FSC-SBBR. EEM fluorescence spectroscopy and SUVA analysis showed that the hydrolytic capacity of biofilm attached in FSC was stronger than those of SC, and the hydrolysis of EPS released more DOM contributed to lysis-cryptic growth metabolism. In additional, Bacteroidetes and Mizugakiibacter associated with sludge reduction were the dominant phylum and genus in FCS-SBBR. Thus, the effect of simultaneous in situ sludge reduction and pollutant removal in FSC-SBBR was better. 相似文献
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