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
12
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
[originaltext]W:Theseareveryniceshirts.Howmucharethey?M:Fivedollars
Accordingtothispassage,dyingmainlyfallsintothreecategories.[br]Themo
文字处理软件()是OffiCE的主要程序,它在文字处理软件市场上拥有统治份额。
决策者常常面对许多可选方案但只能选择其中的一个,他们经常在风险或不确定的情况下,
根据板块轮动、市场风格转换调整投资组合是()的代表。A.战术性投资策略
根据《测绘作业人员安全规范》,测绘人员在人、车流量大的城镇地区街道上作业时,下列
革兰阴性细菌的致热物质主要是A.外毒素B.螺旋素C.溶血素D.全菌体、肽聚糖和内
银行业金融机构有违法经营、经营管理不善等情形,不予撤销将严重危害金融秩序、损害公
发行主体向个人和机构投资者销售公债的公债发行方式是()A.直接发行方式 B.
质量管理体系的有效运行中,质量管理体系要素管理到位的前提和保证是管理体系的()。
最新回复
(
0
)