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排序方式: 共有192条查询结果,搜索用时 15 毫秒
111.
Mengqing Ge Tao Lin Kemei Zhou Hong Chen Hang Xu Hui Tao Wei Chen 《Frontiers of Environmental Science & Engineering》2021,15(5):93
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Cellulose/polyethylene (CPE) mixture 3:1, w/w with and without three clay catalysts (K10 – montmorillonite K10, KSF – montmorillonite KSF, B – Bentonite) addition were subjected to pyrolysis at temperatures 400, 450 and 500 °C with heating rate of 100 °C/s to produce bio-oil with high yield. The pyrolytic oil yield was in the range of 41.3–79.5 wt% depending on the temperature, the type and the amount of catalyst. The non-catalytic fast pyrolysis at 500 °C gives the highest yield of bio-oil (79.5 wt%). The higher temperature of catalytic pyrolysis of cellulose/polyethylene mixture the higher yield of bio-oil is. Contrarily, increasing amount of montmorillonite results in significant, almost linear decrease in bio-oil yield followed by a significant increase of gas yield. The addition of clay catalysts to CPE mixture has a various influence on the distribution of bio-oil components. The addition of montmorillonite K10 to cellulose/polyethylene mixture promotes the deepest conversion of polyethylene and cellulose. Additionally, more saturated than unsaturated hydrocarbons are present in resultant bio-oils. The proportion of liquid hydrocarbons is the highest when a montmorillonite K10 is acting as a catalyst. 相似文献
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A scaled-up conversion process of fish waste to liquid fertilizer was performed in a 5 L ribbon-type reactor. Biodegradation was performed by inoculation of autoclaved fish waste with 5.84 × 10(5) CFU mL(-1) of mixed microorganisms for 96 h. As a result, the pH changed from 6.92 to 5.72, the cell number reached 7.28 × 10(5) CFU mL(-1), and approximately 430 g (28.3%) of fish waste was degraded. Analyses indicated that the 96 h culture of inoculated fish waste possessed comparable fertilizing ability to commercial fertilizers in hydroponic culture with amino acid contents of 6.91 g 100 g(-1). Therefore, the scaled-up production achieved a more satisfactory fish waste degradation rate (3.61 g h(-1)) than the flask-scale production (0.24 g h(-1)). The biodegraded broth of fish waste at room temperature did not undergo putrefaction for 6 months due to the addition of 1% lactate. 相似文献
116.
在含有残留油品的受限空间内作业时,易发生油气燃爆事故。利用两性离子型氟碳表面活性剂组分制备了具有低表面张力的抑爆剂溶液,能够在易挥发烃类液体表面自由铺展成液膜,从而对烃类液体形成液封,抑制油气挥发。利用超细雾化装置,能够将抑爆剂溶液雾化形成液体气溶胶,气力输送至受限空间内。实验验证了受限空间内液体气溶胶中的微小液滴能够沉积在残留油品的表面形成液封,同时液滴和液膜的气液界面能够吸收空间内的油气分子,从而降低空间内的油气浓度。研究证明,利用抑爆剂液体气溶胶混合物来置换含残留油品受限空间内的油气,能够将受限空间内的油气浓度长久维持在10%LEL(Lower Explosion Limit)以下,降低空间内油气燃爆风险。 相似文献
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Yingchao Zhang Hongqiong Zhang Xinwei Dong Dongbei Yue Ling Zhou 《Frontiers of Environmental Science & Engineering》2022,16(8):99
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高效液相色谱法测定矿区塌陷区水体中多环芳烃 总被引:1,自引:0,他引:1
高效液相色谱法是目前多环芳烃(PAHs)测定最常用技术之一。针对EPA规定的16种优先控制PAHs污染物,采用高效液相色谱法进行矿区塌陷区水体样品的测试。通过紫外-荧光串联使用,紫外检测器变波扫描,荧光检测器波长切换,合理设定流动相梯度洗脱程序等手段优化分析条件,使16个组分在40min内获得良好的分离效果。并分别选取在紫外和荧光检测条件下各组分的最大响应进行定量,使各组分均具有更低的检出限。本方法精密度为0.98%~10.4%,加标回收率达72.4%~112%,可作为各种环境样品中PAHs分析检测的参考。 相似文献
119.
John W. Leung Barrie G.R. Webster 《Journal of environmental science and health. Part. B》2013,48(6):1169-1201
Abstract Radiolabelled end‐use mixtures of glyphosate with and without a cationic surfactant (Ethomeen® T/25) and an organosilicone surfactant (Silwet® L‐77) were applied onto trembling aspen (Populus tremuloids Michx.) leaves at the rate of 1.0 kg of AE (acid equivalent) in 35 L/ha area of foliage. A 5‐mm rainfall with an intensity of 10 mm/h was applied at intervals of 0.5, 8, 24, 36, 48, 72, and 96 h after treatment. Glyphosate washoff was determined by liquid scintillation counting of radioactivity in the rain‐washing. At 36 h post‐treatment, both the adjuvants significantly reduced glyphosate washoff (Ethomeen by 69.6% and Silwet by 59.7%) from foliage, compared to the washoff (82.6%) when Vision alone was applied without the adjuvants. Results on the rate of plant growth indicated that with a rain‐free period of 8 h or more, the growth of most seedlings was stunted within 1 or 2 d. Percentage of foliar browning 20 d after treatment with rain‐free period of 8 to 48 h ranged from 8 to 80% for Vision alone, 75 to 100% for Vision with Ethomeen, and 85 to 100% for Vision with Silwet, respectively. Physical properties of the end‐use mixtures were measured with and without the two adjuvants to examine droplet spreading and drying rates in relation glyphosate rainfastness. The Silwet adjuvant lowered the surface tension of the end‐use mixture, but Ethomeen did not. Droplets containing Silwet were spread more than those containing Ethomeen. However, the greater area of contact caused by Silwet did not contribute to a significant increase in the translocation rate of glyphosate into untreated parts of the seedlings, and showed no relationship with rainfastness of glyphosate deposits on trembling aspen. 相似文献
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