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Natural zeolite and coal cinder were layered as main packing medium of the ecological filter instead of traditional filling to remedy the static lake water in Northern China.The ecological filter was running in a combined upward and downward flow mode.Dynamic experiments were carried out to study the effects of retention time and ambient temperature on pollutants’ removal efficiency of the hybrid ecological filter.The function of plant was also studied by contrast test.It is showed that the removal efficiencies of NH4+-N and TP are increased when the retention time is changed from 1 h to 2 h and 4 h,but the removal efficiency of TN is decreased,the removal efficiency of NH4+-N is increased from 91.5% to 98% and that of TP is increased from 31.8% to 52.5%.When the temperature declines,the temporal removal efficiency of NH4+-N is reduced,but the removal efficiency of 24 h and 48 h is remained.The removal efficiency of TP after 24 h and 48 h is decreased when the temperature declines evidently.The retention time plays an important role in NH4+-N and TP removal,and the ambient temperature is significant for TP removal.The plant favors for TP and organic matter removal but has little effect on TN removal. 相似文献
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以热带假丝酵母(Candida tropicalis)HY4-17为出发菌株,采用电子束辐射技术诱变,经过初筛、复筛及遗传稳定性试验选育核酸高产菌株,通过Plackett-Burman试验、最陡爬坡试验及响应面法优化培养基,并优化接种量和发酵时间以提高核酸产量。结果表明,获得一株生长快速,遗传稳定的突变菌株EBI-21,其核酸含量较出发菌株HY4-17提高了25%。最佳培养基组成为:糖蜜185 g/L,硫酸铵3 g/L,硫酸锌0.05 g/L,硫酸镁0.5 g/L,硫酸亚铁0.05 g/L,磷酸1 mL/L,pH值为4.5。在优化培养基及接种量8%,发酵时间12 h条件下,核酸产量达到1.73 g/L,较未优化前提高了80.21%,培养时间缩短了10 h。 相似文献
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基于CuBB为阴极缓冲层有机太阳能电池性能的研究 总被引:2,自引:2,他引:0
通过定向合成Cu(I)配合物,首次将 其作为阴极缓冲层引入到有机太阳能电池(OSCs)中。实验分析发现,OSCs的光电能量转换效 率(PCE)与CuBB层厚度紧密相关,在标准太阳 光照条件下,结构为ITO/CuPc (20nm)/C60(40nm)/CuBB (x m m)/Al (100nm)的器件PCE随着CuBB厚度的增加 先增大后变小,当厚为8nm 时PCE达到0.94%。器件性能提高的原因主要是CuBB具有良好 的电子迁移率,但厚度过大时则由于串联电阻增加及电子不能经阴极缓冲层传输而使性能降 低。 相似文献
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文章将基于WWW的搜索引擎技术与基于数据库的图象检索技术有机结合起来,提出了一种基于视觉特征的图象搜索引擎方案,并实现了一个图象搜索引擎系统。该系统先用网络机器人在WWW上搜索图象,提取其颜色、纹理或形状特征,与提交的示例图象特征作比较,把图象的URL按与示例图象的相似度大小顺序存入数据库,然后从数据库中返回结果给用户,并在屏幕上显示。实验结果表明,该系统简单易行,能较好地满足用户的需求。 相似文献
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采用电子束辐射方法对铜绿微囊藻生长进行抑制和去除,通过呼吸速率及主要酶活性的变化,研究不同辐射剂量对藻细胞生理活动的影响.结果表明:电子束辐射使铜绿微囊藻受到严重迫害,呼吸速率及抗氧化酶活性在逆境胁迫条件下先增加后降低.3~5 kGy辐射迫害较为严重:藻细胞在辐射胁迫下引起抗氧化酶系统活性降低,体内活性氧产生和清除间的... 相似文献
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在辐射剂量分别为1、2、3、4、5kGy的情况下,研究电子束辐射对铜绿微囊藻生长过程及繁殖规律的影响。结果表明:1kGy的辐射剂量能减缓铜绿微囊藻的正常生长,2~5kGy有明显的灭活效果。实验结束时,对照组和1kGy辐射组光密度上升1.082和0.407;2~5kGy下降分别为0.533、0.731、0.889和0.946。铜绿微囊藻叶绿素a含量的变化规律与光密度变化规律相似。电子束辐射降低藻液的pH值,铜绿微囊藻通过光合作用和生理调节使pH值升高并逐渐稳定下来。电子束辐射使藻液的电导率增加,并通过对藻细胞的破坏使电导率保持增加。电子束辐射使铜绿微囊藻的细胞结构发生明显变化。电子束辐射首先减少细胞外的糖类物质,进而破坏类囊体结构,使光合作用受阻。 相似文献
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An ecological filter is constructed for successful nitrification instead of conventional filter system. Zeolite and coal cinder compose main substrates of this micro-ecological filter. Nitrogen contamination removal process is investigated in three different systems (D system, A system and N system) contrastively. Dominant bacteria colony is applied to intensify the remedying process. The data showed that, NH4+-N removal efficiency in D system is better than those in the other two systems for zeolite absorption, nitrogen removal efficiency by nitrification increased. Functional bacterium consortium can adsorb much NH4+-N in short time. Most nitrogen removal is hastened through nitrification by abundant nitrous and nitride bacterium in dominant colony. That dominant consortium keeps high activity in long time. Phosphorus removal is improved by abundant aboriginal bacterium. Complex functional bacterium is benefit to decompose organic phosphorus and its removal. 相似文献