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一株碱性脱除硫酸盐细菌的筛选及其生长特性研究 总被引:1,自引:0,他引:1
生化铁碱溶液催化法气体脱硫方法(简称DDS法)具有良好脱硫效果,但是DDS溶液在脱硫后会导致脱硫能力降低,为了达到使DDS脱硫残液得到再生的目的,从自然环境中筛选能够使DDS脱硫残液得到再生的微生物并对其进行了研究。通过富集培养及纯化,从黑龙江省五大连池火山口附近土样中筛选出一株碱性条件下脱除硫酸盐的菌株WT-1。对该菌株的生长曲线进行了测定,培养4~6 h菌株进入对数期,20 h左右到达稳定期。并研究了温度、pH值和摇床转速对其生长特性和活性的影响,结果表明,该菌株的最适生长条件为:温度35~45℃,pH值8,摇床转速120 r/min。同时,脱硫试验表明WT-1确实具有脱除硫酸盐的能力。 相似文献
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目的 开展时效过程中61.5%IACS高导耐热铝合金导线析出第二相特性及其电导率与拉伸力学性能变化规律的研究,评价其热稳定性。方法 经过150~230 ℃长达630 h时效,揭示第二相的组成、形态与分布及其对时效态铝合金导线电导率与拉伸力学性能的影响规律。结果 时效态铝合金导线中,颗粒状及针状A13Zr(Y, Er)、A13(Zr(Y)xErl?x)第二相在Al晶内、晶界析出,A13Fe相颗粒弥散分布于Al晶界。伴随着时效过程,铝合金导线的抗拉强度与伸长率先上升、再逐渐下降;同时,铝合金导线的电导率先增大、后逐渐趋于稳定。该趋势随时效温度的升高而越加明显。结论 第二相的析出、长大是影响时效态铝合金导线力学性能及电导率的主要原因。经230 ℃、1 h时效,铝合金导线的强度保持率高达94%,满足GB/T 30551—2014的要求。所有时效态铝合金导线的电导率均高于其初始值,该高导耐热铝合金导线的热稳定性良好。 相似文献
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Isolation and characterization of ferrous- and sulfur-oxidizing bacteria from
Tengchong solfataric region, China 总被引:2,自引:0,他引:2
Microbial oxidation and reduction of iron and sulfur are important parts of biogeochemical cycles in acidic environments such as
geothermal solfataric regions. Species of Acidithiobacillus and Leptospirillum are the common ferrous-iron and sulfur oxidizers from
such environments. This study focused on the Tengchong sofataric region, located in Yunnan Province, Southwest China. Based on
cultivation, 9 strains that grow on ferrous-iron and sulfuric compounds were obtained. Analysis of 16S rRNA genes of the 9 strains
indicated that they were a liated to Acidithiobacillus, Alicyclobacillus, Sulfobacillus, Leptospirillum and Acidiphilium. Physiological
and phylogenetic studies indicated that two strains (TC-34 and TC-71) might represent two novel members of Alicyclobacillus. Strain
TC-34 and TC-71 showed 94.8%–97.1% 16S rRNA gene identities to other species of Alicyclobacillus. Di erent from the previously
described Alicyclobacillus species, strains TC-34 and TC-71 were mesophilic and their cellular fatty acids do not contain !-cyclic
fatty acids. Strain TC-71 was obligately dependent on ferrous-iron for growth. It was concluded that the ferrous-iron oxidizers were
diversified and Alicyclobacillus species were proposed to take part in biochemical geocycling of iron in the Tengchong solfataric region. 相似文献
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为进一步提升全程高温堆肥效率,经筛选和高温驯化,获得高有机质降解效率的耐热复合菌系(TMC),设置全程高温接种TMC堆肥组(T1)、全程高温堆肥组(T2)和常温堆肥组(T3),通过理化指标、粗脂肪和粗蛋白含量、GI等指标的检测和优势细菌演替规律分析,以揭示TMC对全程高温堆肥工艺的影响。结果显示:堆肥结束后有机质含量、C/N、粗脂肪和蛋白含量降幅顺序均为T1>T2>T3(P<0.05),且两两处理之间均具有显著性差异,证明TMC可缩短全程高温堆肥进程。堆肥第14天,T1、T2处理的GI值分别为110%和99%,T3处理仅为80%,表明全程高温堆肥可加速植物毒性物质降解,显著提高堆肥品质,而TMC接种可进一步促进堆肥无害化。PCR-DGGE结果表明:T1、T2处理均显著提高了耐热细菌和耐热木质纤维素降解菌多样性,且并未降低嗜中温木质纤维素降解菌多样性;2类降解菌协同配合实现木质纤维素的更快降解,有利于缩短堆肥进程。综上所述,TMC接种可显著提高全程高温堆肥效率、提升堆肥品质。 相似文献
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《中国个体防护装备》2007,(3):29-29
2007年是杜邦Nomex耐热纤维产品上市40周年,由于对高性能材料需求的不断增长和其自身的广泛应用,Nomex耐热纤维应用领域遍及防护服、电气绝缘等诸多方面。 相似文献
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