首页
登录
职称英语
Scientists have known for decades that coffee beans contain oil. Mohapatra and c
Scientists have known for decades that coffee beans contain oil. Mohapatra and c
游客
2024-05-29
11
管理
问题
Scientists have known for decades that coffee beans contain oil. Mohapatra and colleagues, however, were the first to analyze coffee grounds.
Used grounds usually end up in landfills, though gardeners sometimes use them as a kind of fertilizer. The scientists collected used grounds from Starbucks, which gives bags of grounds away as part of the company’s "Grounds for your garden" program.
To prepare the grounds for analysis, the team first dried them in an oven. They mixed the resulting powder with a combination of solvents (溶剂) that caused the oil to separate from the solution. They extracted the oil, saving the solvents for the next round of processing. The remains could still be used as compost, ethanol feedstock, and fuel pellets.
"We’re not wasting anything, " Mohapatra told Discovery News. "It’s a recycling process."
The study showed that used grounds contain about 15 percent oil by weight, depending on the type of coffee. That’s not too far off the proportions in soybean, rapeseed, and palm oils, which are also used as sources for bio-diesel. And coffee oil is more stable than these other sources because of its high antioxidant content, found the study, which appeared in December in the American Chemical Society’s Journal of Agricultural and Food Chemistry.
Around the world, growers produce more than 16 billion pounds of coffee each year, according to the U.S. Department of Agriculture. The scientists estimate that spent grounds could add 340 million gallons of bio-diesel to the global fuel supply.
Mohapatra pictures a streamlined coffee recycling system, in which the same trucks that deliver beans to Starbucks could pick up the brewed waste and head to a bio-diesel plant. The plant would be close by, to save on transportation costs and emissions.
Coffee grounds appear to produce high-quality oil, granted Robert McCormick, an engineer at The National Renewable Energy Laboratory in Golden, Colorado. But, he said, coffee probably won’t be a practical solution to the world’s energy needs.
For one thing, the country’s main sources of bio-diesel-cooking oil and animal fat-are 100 percent oil, compared to coffee’s 15 percent. And even when a cafe brews a large amount of coffee, relatively few grounds are left behind. It takes 50 gallons of spent grounds to produce just 1 gallon of oil, Mohapatra said.
Still, McCormick commends the researchers for thinking outside the box about the world’s energy issues.
"Anything that takes a waste product and makes a fuel out of it is really a positive," he said. "This is pretty cool. " [br] What has been mentioned as the advantage of coffee oil when it is compared with soybean, rapeseed and palm oils?
选项
答案
It is more stable.
解析
第5段第3句中these other sources对应题干中的soybean,rapeseed and palm oils,答案应为It is more stable.
转载请注明原文地址:https://tihaiku.com/zcyy/3610458.html
相关试题推荐
[originaltext]W:Kevin,Youarehavinganothercupofcoffee?That’syourthird
[originaltext]W:Kevin,Youarehavinganothercupofcoffee?That’syourthird
[originaltext]W:Kevin,Youarehavinganothercupofcoffee?That’syourthird
Scientistshaveknownfordecadesthatcoffeebeanscontainoil.Mohapatraandc
Scientistshaveknownfordecadesthatcoffeebeanscontainoil.Mohapatraandc
Climatescientistsneedtoswallowtheirmistrustsandsharetheirdataa
Climatescientistsneedtoswallowtheirmistrustsandsharetheirdataa
Climatescientistsneedtoswallowtheirmistrustsandsharetheirdataa
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrols
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrols
随机试题
Receivingvisitorsandguestsisanimportantpartofthesecretary’sdaily
Peoplebecomequiteillogicalwhentheytrytodecidewhatcanbeeatenand
坚持不懈取决于三个方面——目标、意志和热情。有目标的人总能集中他的力量。凭借坚定的意志,就能使希望和计划不致化为梦幻,而是日有所进,积沙成塔。冲天的热情
甲亢初始治疗的首选方法是A.放射性碘治疗 B.替代治疗 C.抗甲状腺药物治疗
女性,45岁,风湿病史多年,近年来呼吸困难进行性加重,并出现颈静脉怒张,肝脏肿大
与喜食过硬、过热食物,进食过快、龋齿、口腔不洁,慢性刺激或炎症有关的疾病是A.胃
药物稳定与否的根本原因在于自身的化学结构,外界因素则是引起变化的条件,影响药物制
2013—2020年,全国普通高校毕业生人数同比增速超过4%的年份有几个
以应用知识为基础的薪酬是( )。A.岗位薪酬 B.绩效薪酬 C.技术薪酬
(2015年真题)环戊噻嗪、氢氯噻嗪、呋塞米、氯噻嗪的效价强度和效能见下图,对这
最新回复
(
0
)