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以磷矿浆为脱硫剂进行烟气脱硫研究,比较了自主创新研制的中试规模环栅式喷射鼓泡塔与工业规模的日本千代田CT-121脱硫鼓泡塔的性能。结果表明:塔压降和脱硫剂的pH值是影响脱硫效率的关键因素。鼓泡塔采用三塔串联,控制磷矿浆pH值为3.5~4.2、操作压力为7 000~7 800 Pa时,脱硫效率维持在95%左右。环栅式喷射鼓泡塔维持单塔压降约在3 000 Pa左右,磷矿浆pH值在3.7~4.3时脱硫效率可达67%。环栅式喷射鼓泡脱硫工艺以磷矿为脱硫剂,脱硫除尘效果好,系统投资少,运行费用低,并能资源化利用废渣,是适合我国国情的一项脱硫除尘技术。 相似文献
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Chunping Yang Guanlong Yu Guangming Zeng Haining Yang Fayuan Chen Congying Jin 《环境科学学报(英文版)》2011,23(8):1325-1333
Two identical bench-scale biotrickling filters (BTFs), BTF 1 and BTF 2, were evaluated for toluene removal at various gas empty bed
contact times (EBCTs) and organic loadings. BTF 1 and BTF 2 were packed with structured and cubic synthetic polyurethane sponges,
respectively. At a constant toluene loading of 16 g/(m3 hr), toluene removal efficiencies decreased from 98.8% to 64.3% for BTF 1
and from 98.4% to 74.1% for BTF 2 as gas EBCT decreased from 30 to 5 sec. When the toluene loading increased from 35 to 140
g/(m3 hr) at a gas EBCT of 30 sec, the removal efficiencies decreased from 99.1% to 77.4% for BTF 1 and from 99.0% to 81.5% for
BTF 2. The pressure drop for both BTFs increased with increased air flow rate, and did not significantly vary while the toluene loading
was increased under similar operation conditions. BTF 1 and BTF 2 could start up successfully within 19 and 27 days, respectively,
when packed with fresh sponge media, and the performances could be restored in 3–7 days after biomass was removed and wasted
from the media. BTF 2 displayed higher removal efficiency even under shorter EBCT or higher loading rate than BTF1 when other
operation conditions were similar, while it showed lower pressure drop than BTF 1 during the whole period of operation. These results
demonstrated that both BTFs could treat waste gas containing toluene effectively. 相似文献
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Xiong Ying Dai Xiaolei Liu Yuanyuan Du Chunyan Yu Guanlong Xia Yan 《Environmental science and pollution research international》2022,29(39):59013-59026
Environmental Science and Pollution Research - Nanocarbons have been demonstrated as promising carbon catalysts for substituting metal-based catalysts for the green treatment of wastewater. In this... 相似文献
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为进一步提高Fe-C二元微电解材料去除难降解抗生素氧氟沙星(OFL)的性能,构建了Fe-Cu-C三元微电解体系.主要探究了Fe-Cu-C三元微电解材料的最佳制备及运行条件,通过添加淬灭剂鉴别微电解反应过程中产生的主要活性物质,采用SEM、XRD、EDS、FTIR、UV-Vis对絮体、反应前后的微电解材料及OFL废水进行表征.结果表明:Fe-Cu-C三元微电解材料的最佳制备条件为:Fe/C比为1:1、膨润土比例为35%、碳酸氢铵比例为7%、煅烧温度为900℃、CuO添加比例为4%.该条件下,Fe-Cu-C三元微电解体系对OFL的去除率较Fe-C二元微电解体系提高了15.28%.在OFL初始浓度为20 mg·L-1、pH=6、投加量为20 g·L-1、曝气量为5 L·min-1时对OFL的降解效果最好,达到了88.06%,较Fe-C二元微电解体系提高了10.22%.微电解材料去除OFL主要依靠活性物质的降解作用,而Fe-Cu-C三元微电解体系能够增加电子转移途径,从而加快电子转移速度,产生更多的活性物质,具有更强的OFL断键能力.以上结果表明,Fe-Cu-C三元微电解体系具有更显著的OFL降解效果. 相似文献
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Rotating drum biofilters (RDBs) mounted with reticulated polyurethane sponge media has showed high removal efficiencies over a long period of time when used for volatile organic compound (VOC) removal. Due to the accumulation of biomass within the sponge medium, the porosity of a filter bed usually changes dynamically, which makes it difficult to predict and to control. In this paper, the porosity of a multi-layer RDB bed was investigated by a diffusion-reaction model in which biofilm growth and decay were taken into account at the pore scale of the sponge medium. Temporal and spatial changes of porosity were studied under various organic loadings and gas empty bed contact times (EBCTs). The porosity of the biofilter bed was assumed to be a function of biofilm thickness, and all the pores were assumed to be uniform. Toluene was selected as the model VOC. The model was solved using numerical methods through the MATLAB software. Results show that the porosity decreased with increased time of operation, increased toluene loading, or decreased gas EBCT value. The porosity in the outermost medium layer was less than that in the inner medium layers. Toluene removal efficiencies and porosities calculated from this model correlated with the experimental data well. Porosity variation was proposed to be an indicator for prediction of biofilter performance in biofilters as a consequence. 相似文献