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活性半焦(炭)脱硫性能影响因素的研究 总被引:2,自引:0,他引:2
在不同炭化条件(炭化温度、炭化时间)和活化条件(活化温度、活化时间以及水蒸汽流量)下制取活性半焦。用碘吸附值和硫容表征了活性半焦的微孔结构及其脱硫能力,考察了制备条件对活性半焦微孔及其脱硫能力的影响。并探讨了脱硫能力与活性半焦微孔之间的关系。 相似文献
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活性炭烟气脱硫技术研究新进展 总被引:3,自引:0,他引:3
研制了新型活性炭脱硫剂-脱硫活性碳纤维。研究表明,脱硫活性碳纤维由于含碳量高、比表面积大、微孔丰富、孔径分布窄、有较多适于吸附SO2的表面官能团,因而吸附能力及吸附、脱附速度显著大于普通活性炭。在相同工艺条件下,脱硫活性碳纤维吸附容量为粒状疾性炭的4-5倍,空速粒达活性炭的10倍。采用活性碳纤维脱硫可比普通活性碳脱硫剂用量成倍减少。另外,由于活性碳纤维阻力小,系统能耗可显著降低。活性碳烟气脱硫采用 相似文献
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介绍了水浴式除尘器除尘、脱硫双净化系统的构造、工作过程和除尘脱硫原理。该净化系统与同类除尘器相比,构造简单,施工方便,节水,节电,无二次污染,除尘、脱硫净化效率高,是中小型锅炉消烟除尘脱硫的理想除尘设备。 相似文献
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在分析我国煤炭资源状况、煤中硫的赋存状态和燃煤引起的SO2污染状况的基础上,探讨了国内外控制SO2排放的研究现状,研究了燃烧前、燃烧中和燃烧后三大类脱硫方法的可行性与适用范围。研究认为,对洗选脱硫要先对煤中硫的赋存状态进行研究,否则效率难以得到保证;固硫剂脱硫比较适合我国国情,但脱硫效率有待提高。固硫剂脱硫和洗选脱硫可结合使用,以提高脱硫率。 相似文献
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简要介绍了广东省7个火电厂现有的5种烟气脱硫技术装置:海水脱硫、荷电干式烟气脱硫、湿式石灰石/石膏法烟气脱硫、DCL燃煤固硫剂脱硫及烟气循环流化床脱硫技术,对它们的经济、技术性进行了分析比较。 相似文献
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通过对循环流化床锅炉炉内脱硫与炉外脱硫两种脱硫方法的脱硫效果、投资、运行成本进行综合比较分析,认为两种脱硫方法在工程及设备上的投资基本相当,但采用炉外脱硫的效果较好、运行成本较低,因此炉外脱硫应是目前循环流化床锅炉脱硫的首选方法。 相似文献
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本文对国内外脱硫技术进行了综合性比较,分析了国内研究现状,同时对引进的脱硫工艺作了分析汇总,在此基础上,预测了脱硫技术在我国的应用前景,并就开展脱硫工艺提出相关建议。 相似文献
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本文基于对我国环保市场的调查,分析了国内外工业锅炉的烟气脱硫现状,指出了我国目前中、小型工业锅炉烟气脱硫技术的特点及存在的问题,并就我国中、小型工业锅炉的烟气脱硫提出了初步的看法。 相似文献
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脉冲电晕等离子法烟气脱硫脱硝的研究 总被引:1,自引:0,他引:1
本文探讨了脉冲电晕等离子法脱硫脱硝的基本原理,较系统地研究了影响脉冲电晕等离子烟气脱硫脱硝的主要因素,进行了加NH3脱硝的探索试验。实验表明:该法能有效地去除烟气中的SO2,但脱硝效果不明显,加NH3后可大量提高脱硝的效率;湿度对脱硫影响较大,湿度越高,脱硫效率也越高,当相对湿度达80%时,脱硫率基本达到最大,而湿度对脱硝的影响不如脱硫明显;脉冲电压越高,功率越大,脱硫脱硝效率越高;增加放电极长度 相似文献
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Many studies have reported the presence of antibiotic-resistant Pseudomonas aeruginosa in environmental samples such as hospital wastewater and surface water. The present study evaluated the contribution of untreated hospital wastewater to the dissemination of resistant P. aeruginosa strains in aquatic environments, through the analysis of their antibiotic susceptibility profile and genetic similarity. Wastewater samples were collected from two hospitals located in Rio Grande do Sul, RS, Brazil. Superficial water samples were collected from water bodies that received this wastewater discharge. The antibiotic susceptibility profiles of the strains were determined using the disk-diffusion technique and their genotyping was done by amplification of the Enterobacterial Repetitive Intergenic Consensus sequences (ERIC-PCR). The antibiotic resistance was higher among the hospital wastewater strains and the multiresistant phenotype was also observed only among these strains. The ERIC-PCR profiles did not reveal any genetic similarity among the P. aeruginosa strains from the wastewater and superficial water samples. On the contrary, they showed that genetically distinct populations were established in these different environments and probably that some other contamination source could be contributing to the presence of resistant strains in these water bodies. 相似文献
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Bacteriophages (phages) associated with Salmonella were collected from nine swine manure lagoons in Mississippi. Phages were isolated by an enrichment protocol or directly from effluent. For enrichment, chloroform-treated samples were filtered (0.22 mum) and selectively enriched by adding a cocktail of Salmonella strains in trypticase soy broth. After overnight incubation at 35 degrees C, chloroform was added and samples stored at 5 degrees C. Enriched samples were tested by double agar layer (DAL) plaque assay against individual Salmonella isolates. Phage titers of 2.9 x 10(8) to 2.1 x 10(9) plaque forming units (pfu) per mL were produced, but estimation of phage titers in lagoons was not possible. For direct isolation, effluent was clarified by centrifugation, filtered (0.22 microm), and used in DAL plaque assays to select single-plaque isolates for 15 Salmonella strains. Plaque counts varied among Salmonella strains and lagoons. The most sensitive strain for direct phage recovery was ATCC 13311. Phage titers estimated by direct isolation with ATCC 13311 ranged among lagoons from 12 to 148 pfu per mL. In limited host range tests, 66 isolates recovered by the enrichment protocol produced plaques only on Enteritidis and Typhimurium strains of Salmonella and none produced plaques on lagoon isolates of Citrobacter, Escherichia, Proteus, Providencia, or Serratia. Electron microscopy (EM) showed purified enrichment isolates had Podoviridae morphology (tailless 50-nm icosahedral heads with tail spikes). Electron microscopy of clarified concentrated effluent showed 5.5:1 tailless to tailed phages. The isolated phages have potential as typing reagents, specific indicators, and biocontrol agents of Salmonella. 相似文献
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高效纤维素分解菌复合系的构建及其环境适应性研究 总被引:1,自引:0,他引:1
以纤维素培养基和纤维素刚果红培养基为初筛和复筛培养基,从采集的样品中分离得到具有纤维素分解能力的菌株20株。选择其中具有较高纤维素酶活力的12个菌株与2株自生固氮菌和EM菌进行正交实验,得到3个组合表现出协同降解纤维素的作用,对滤纸降解效果为组合12〉组合8〉组合5。选用组合12进行了一系列的环境适应性研究,结果表明,碳源为微晶纤维素+CMC-Na时CMC酶活最高,最适氮源为蛋白胨+酵母膏,最适pH6.5,最适培养温度为30℃。培养第6天CMC酶活最高。 相似文献
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聚丙烯酰胺降解菌的分离和鉴定 总被引:1,自引:0,他引:1
三次采油产生的大量含聚丙烯酰胺(PAM)的污水急需处理,其核心问题是PAM的生物化学降解。文章叙述了从含聚合物油田污水中分离到七株PAM降解菌的过程,并对其营养物体系进行了初步研究及分子生物学鉴定。结果表明,分离到的七株菌可以以PAM为唯一氮源和碳源进行生长,但是生长速度较慢,添加液蜡或酵母膏等可导致微生物菌群的共代谢,能加快PAM的生物降解。七株菌分别归类于放线杆菌纲和α-变形菌纲及芽孢杆菌,与数据库中已知菌的同源性均超过98%。 相似文献
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This study was conducted to investigate microbial organisms that can be used for preventing clogging in drip irrigation systems caused by biological factors. A total of 25 fungi isolate and 121 bacterial strains were isolated from water samples collected from drip irrigation systems in tomato greenhouses in the eastern Anatolia region of Turkey in the spring season of 2001. Biological clogging of emitters in a model drip irrigation system was experimentally caused by application of the microorganisms (fungi and bacteria) isolated in the study. Three antagonistic bacterial strains in the genus Bacillus spp (ERZ, OSU-142) and Burkholdria spp (OSU-7) were used for treatment of biological clogging of the emitters. The results showed that the antagonistic bacterial strains tested have the potential to be used as anti-clogging agents for treatment of emitters in drip irrigation system. This is the first study that demonstrated that antagonistic microorganisms can be utilized for treatment of clogging in drip irrigation systems. 相似文献
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Adebayo A. Otitoloju Geraint B. Rogers Nicholas R. Bury Christer Hogstrand Kenneth D. Bruce 《The Environmentalist》2009,29(1):85-92
Bacterial strains were isolated from sediment samples from the Thames River. Successive transfer growth of the various strains
on nutrient agar containing increasing concentrations of AgNO3 revealed that three of the bacterial isolates were found to be capable of tolerating high concentrations of AgNO3 ranging from 20 to 80 mM on a solid medium and up to 10 mM AgNO3 in liquid medium. Molecular characterization and identification based on 16S rDNA gene sequencing of three strains of bacteria
that are tolerant to silver nitrate showed that the major tolerant strains include the superbug, Shewanella oneidensis, Pseudomonas sp. and Bacillus sp. Protein extraction and two-dimensional (2D) sodium dodecyl sulfate SDS-polyacrylamide gel electrophoresis (PAGE) of the
protein extracts in bacteria exposed to very high concentrations of AgNO3 revealed a general reduction in the number of expressed proteins, although two protein spots were conspicuously over expressed
in the exposed bacteria compared to control. The N-terminal amino acid sequence analysis of the protein spots identified the
major up-regulated proteins as the outer membrane protein To1C (45.2 kDa) and the structural protein of the flagellar filament,
flagellin (28.34 kDa), encoded for by the to1C and fliC genes, respectively. The roles of these genes in a number of multi-drug resistant pathogen and potentials for biotechnological
applications in toxic metal control for treatment of contaminated ecosystems and biomining were discussed. 相似文献
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To increase reliability and electrical performance, shallow-trench isolation (STI) (or called field-oxide (FOX)) structures were inserted in the bulk-contact region of 60-V high-voltage p-channel lateral-diffused MOSFET (pLDMOS) devices in this study. As the FOX ratio increased with the addition of FOX segments, the value of the secondary breakdown current (It2) was enhanced. Therefore, the anti-electrostatic discharge ability of a pLDMOS device can be efficiently improved using this novel method. In addition, when the weighting ratio of FOX structures increased, variation values in the trigger voltage (Vt1) and holding voltage (Vh) of the corresponding samples remained within the range of approximately 1–4 V. The Ron value decreased because of more uniform conduction. The experimental data for the FOX structures added to the bulk revealed that the It2 value was improved by approximately 13.98%, Vh values were greater than 60 V (which is favorable for latch-up immunity), and the Ron value was decreased by approximately 12.62% compared with a reference device under test (without FOX segments in the bulk-contact region). 相似文献