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
2023-09-07
31
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] The research shows that the oil contained in used grounds varies according to______.
选项
答案
the type of coffee
解析
此处应填入名词(词组)。题目中的according to“随……而定”与文中的depending on对应,其后的内容就是答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2994191.html
相关试题推荐
Popularideologicalassumptionsaboutsocietychangewiththedecades,asw
Popularideologicalassumptionsaboutsocietychangewiththedecades,asw
Popularideologicalassumptionsaboutsocietychangewiththedecades,asw
Popularideologicalassumptionsaboutsocietychangewiththedecades,asw
Inrecentdecades,thereisaphenomenonwhichmakesusgivesomeattention
Inrecentdecades,thereisaphenomenonwhichmakesusgivesomeattention
Inrecentdecades,thereisaphenomenonwhichmakesusgivesomeattention
Inrecentdecades,thereisaphenomenonwhichmakesusgivesomeattention
Inrecentdecades,thereisaphenomenonwhichmakesusgivesomeattention
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
随机试题
TacklingHungerinMsekeniATherearenotenoughclassroomsattheMsekeniprim
Celebritiesandthemediahaveadistinctly’love-hate’relationshipand,wh
[originaltext]M:Hello.Ineedtotalkwithsomeoneaboutmydriver’slicense.
某工程有5个施工过程,分4个施工段组织固定节拍流水施工,流水节拍为2天。则流水施
使用二波波形梁板(310mm×85mm×4mm)的安全护栏级别有()。A.
下列选项中,属于现代美术教学媒介的是()。A.实物模型 B.多媒体课件
某企业拟建立新的零售商场、开拓新市场之前通常有针对性的进行一次市场调查,根据调查
“六艺”和“七艺”分别指什么?
关于工程预付款的说法,正确的是()。A.包工包料工程的预付款支付比例不得高于签约
根据《建设工程质量管理条例》,建设工程保修期自()之日起计算。A.竣工决算完成
最新回复
(
0
)