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光强与氮源是影响微藻生长与物质积累的重要因子,文章研究了光强、氮源、氮源浓度对一株自然条件下分离的绿球藻GN38的生长和油脂积累的影响。实验通过在不同光照强度(179μmol/m2·s-1和84μmol/m2·s-1)条件下,分别以具浓度梯度(1N,1/3N,1/5N)的NaNO3和CO(NH2)2为氮源培养绿球藻,获得了GN38生长与产油的较佳条件。结果表明,较高光强能促进GN38生长和总脂积累;CO(NH2)2有利于GN38积累油脂;不同氮源均表现出氮源浓度与生物量成正比,无氮组除外;179μmol/m2·s-1光强、1/5N时GN38的总脂含量最高。综合考虑,产油微藻GN38的最佳培养条件为179μmol/m2·s-1光强和0.528 g/L CO(NH2)2,在此条件下干重达到6.7g/L,总脂含量为38%,总脂产量为2.54 g/L,脂肪酸成分中C16和C18含量高达95.15%。实验为该藻的后续深入研究及产业化培养奠定了基础。 相似文献
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木质纤维素酒精发酵菌种的筛选 总被引:9,自引:3,他引:9
为对本质纤维素水解糖液进行酒精发酵,同时代谢葡萄糖和木糖成酒精的9个菌种以木糖为唯一碳源进行驯化,从中选出3个菌株。并对3个菌株进行固定化,进行酒精发酵研究,以进一步阐明该菌株代谢葡萄糖和木糖成酒精的能力。以总糖利用率、葡萄糖和木糖利用率、酒精产率为指标,3株菌具有较好的同时发酵葡萄糖和木糖成酒精的能力。Pachysolen tannophilis ATCC 32728的总糖(5%葡萄糖和2%木糖)利用率达到了85.08%(36h),葡萄糖的利用率为99.21%(36h),木糖利用率80.38%(36h),菌株Cadida shehatae ATCC 34887的酒精产率达到理论值的82.91%。 相似文献
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混合菌群用于纤维素糖化和燃料酒精发酵的试验研究 总被引:2,自引:0,他引:2
采用刚果红纤维素平板法分别从田间腐烂的秸秆、潮湿地中的腐烂落叶内筛选出12株分解纤维素的菌株,分别进行了在不同温度、pH和时间条件下的羧甲基纤维素酶活(CMC)和滤纸酶活(FPA)的检测,筛选出了4株分解效率较高的菌株。采用正交实验研究了2株菌活性的主要影响因素,最终筛选出了2株产酶稳定的纤维素分解菌。采用扫描电镜,对菌株形貌进行了分析。应用2株纤维素分解菌和酵母菌混合菌种发酵的同时糖化发酵工艺,分别进行了单菌株和混合菌株的玉米秸秆糖化及燃料酒精发酵的试验研究,研究表明,混合菌群发酵后酒精产量为16g酒精/100g秸秆。 相似文献
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稻壳粉水解液发酵生产燃料酒精的研究 总被引:7,自引:1,他引:7
在试验室内分离、筛选、驯化培养出一株高效木糖酒精发酵菌株g-13,采用该菌株发酵稻壳粉水解液,可以同时将水解液中的葡萄糖和木糖转化为酒精,酒精转化率为0.38g/g(酒精/消耗的糖).该试验技术可操作性强,发酵条件易于控制.文章最后还对稻壳粉的水解条件进行了优化探索. 相似文献
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高浓度含盐有机废液焚烧技术 总被引:2,自引:0,他引:2
介绍了有机废液焚烧处理的国内外现状、焚烧工艺及焚烧设备,比较了各自的处理效果及优缺点,针对有机废液中的碱金属和碱土金属盐在焚烧过程中容易形成低熔点的共晶体,造成焚烧炉的结焦、结渣、流化失败等危害,着重分析了含盐有机废液的焚烧处理技术,最后提出了采用蒸发结晶技术对有机废液进行脱盐处理的可行性。 相似文献
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Vanadium pentoxide (V2O5) is a common cathode material for lithium‐ion battery, but its low electronic and ionic conductivity seriously affect its electrochemical performances. In this paper, a type of carbon‐coated V2O5 and S composite cathode material with PVA as the carbon source is utilized to lithium‐ion batteries. X‐ray diffraction and Raman test results illustrate that sulfur can make the V2O5 lose part of oxygen atoms and become nonstoichiometric vanadium oxide (V2O5‐x). Electrochemical test results show that sulfur can provide a considerable proportion of the specific capacity of the whole cathode. This illustrates that the synergistic effect of sulfur can optimize the structure of vanadium pentoxide in order to increase more electron transfer channels, and at the same time, it also can provide additional specific capacity for the whole cathode. When the ratio of V2O5 and sulfur is 1:3, the discharge specific capacity can reach 923.02, 688.37, and 592.70 mAh g?1 at 80, 160, and 320‐mA g?1 current density, respectively, and after 100 times charge and discharge cycles at 320‐mA g?1 current density, the capacity retention rate can achieve to more than 60%. 相似文献
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A transient computer model has been developed to investigate the effect of a black plastic bubble sheet on the evaporation process in a shallow salt pond. The transient behaviour of the evaporation process and the influence of various parameters such as the depth of the brine layer, weather, and wind speed are discussed and compared for ponds with and without a black plastic bubble layer. The results show that the influence of soil properties on the evaporation process is small for a pond with a plastic bubble sheet, and that the evaporation rate may be higher with the black sheet. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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《Journal of power sources》2006,159(1):405-411
In the present paper the effect of the type of inorganic filler on the composite polymeric electrolyte–lithium electrode interfacial behavior is analyzed. Studies are performed in the wide LiClO4 concentration range using poly(ethylene oxide)dimethyl ether (PEODME) as an electrolyte matrix. It is demonstrated that both the formation and the growth of the resistive layers at the polymer electrolyte–lithium electrode interface are determined by the salt concentration range and depend also on the type of the filler used. It is demonstrated that for salt concentrations lower than 10−3 mol kg−1 or higher than 1 mol kg−1 addition of filler results in the suppression of the growth of the resistance of the interfacial layer. This effect has been related to an increase in lithium cation transference number observed in these salt concentration ranges in composite electrolytes compared to the pure PEODME–LiClO4 analogues. The effect of the filler on conductivity, microstructure and thermal characteristic of electrolytes studied is also discussed. 相似文献
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生物炭的制备及其对氮肥吸附效果的研究 总被引:1,自引:0,他引:1
以玉米秸秆为原材料,分别在350、400、450℃下炭化3 h制备玉米秸秆生物炭(分别命名为B350、B400、B450),利用X射线衍射仪、扫描电镜仪、比表面积及孔径分布仪、红外光谱仪等对材料进行表征,确定材料的相关性能,并探讨其与氮肥吸附的相关性。以平衡实验法研究了溶液pH对生物炭吸附氨氮的影响。实验结果表明:玉米秸秆生物炭B350、B400、B450对氨氮的吸附过程均遵循二级吸附动力学模型,且采用Langmuir方程能更好地描述吸附等温线模型;玉米秸秆生物炭对氨氮的饱和吸附量按从大到小依次为B400、B350、B450,且均为有利吸附;玉米秸秆生物炭对氨氮吸附的最佳pH为8~12。 相似文献
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通过采用A/O膜生物反应器工艺处理生活污水的动态模拟方法,研究污泥膨胀对该系统脱氮效果的影响。结果表明,污泥膨胀对总氮的去除率基本无影响,丝状菌比表面积大,在低底物浓度的条件下对基质的亲和能力比菌胶团强,使得CODcr的平均去除率提高3.8%,NH3-N的平均去除率提高3%。丝状菌的捆绑、覆盖所引起的膜污染极其严重,膜通量无法保持稳定。 相似文献