B1 中級 美國腔 15701 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
Just a minute ago,
this oil helped make a delicious meal possible.
But now, it's just some nasty goop.
What should we do with it?
Well, the easiest thing would be
to pour it down the drain;
that makes it seem like it's gone,
but it's not really gone.
Instead, it's collecting bits of food
and other random stuff,
producing monstrous, greasy blockages
that clog not only your own drain
but entire sewage systems,
causing flooding and pollution.
Many places have laws for proper disposal of grease,
but we can go one step further.
Instead of just throwing it away safely,
we can turn it into something useful.
And if you're wondering
what anyone could possibly want
with a bunch of disgusting, used cooking oil,
the answer is: biodiesel.
You've probably heard of diesel engines.
They power farming and construction equipment,
trucks, buses, ships, trains, backup generators,
and even some cars.
Most of the fuel that feeds these engines
is refined from petroleum,
which comes from long-dead dinosaurs
and other ancient fossils.
But diesel fuel can also be derived from
more recently-dead organisms,
like plants and animals.
And this type of fuel is what we call biodiesel.
Biodiesel is a biodegradable energy source,
made from plant oils or animal fats,
that can usually be burned in regular diesel engines.
You guessed it,
it's the 'bio' version of diesel.
It's cleaner than normal diesel,
so there has been a push to generate it
from crops like soybeans.
Now, growing plants for fuel,
instead of food, comes with its own problems.
But fortunately, we already have some oils and fats right here.
Preparing your used cooking grease for recycling
is easy.
First, let it cool down to room temperature.
Then, transfer it to a clean container.
You can use any old bottles you have lying around,
like milk jugs,
as long as they're completely empty,
rinsed, and dried.
Use a funnel to avoid spills
and a sieve to filter out any small food particles.
You can even add bacon grease
and other animal fats
or the excess oil from canned food,
like tuna or sardines,
just make sure it's really oil and not brine.
So, what happens now that your oil is safely contained?
Well, many cities have recycling services
that will pick up large amounts of grease
from restaurants and other establishments.
But there are locations
where individuals can drop off their containers, as well.
All of this grease will end up at a processing plant,
where it can be converted to useable biodiesel.
How does this conversion work?
Well, all these oils and fats you donated
are made up of triglycerides,
a glycerol molecule connected to
three fatty acid chains.
To convert fats to fuel,
they react with an alcohol,
usually methanol or ethanol,
which produces long-chain esters and glycerol.
To compare, here are some molecules
of regular diesel fuel.
Now, here are the molecules we created
by breaking apart the triglycerides.
Glycerol is the odd man out,
so it's removed at the end of the process.
But look at these esters!
If you squint, their structures look pretty similar
to those of the long-chain hydrocarbons in regular diesel.
And diesel engines, with a few small modifications,
can also be made to squint
and burn these esters like regular diesel fuel.
Et voila! Biodiesel.
Now, you might be wondering whether all this hassle
over recycling used cooking oil
is even worth it.
After all, how much energy can it possibly generate?
Well, if all the grease that New Yorkers throw away in one day
were converted to jet fuel,
it would be enough to power several hundred flights
from New York to Los Angeles.
And let's not forget that using waste oil
instead of burning more fossil fuels
will limit our negative effects on the environment.
Recycling used cooking grease
turns goop into good.
By contributing a little bit,
individuals and businesses can help create
an alternative, stable source of diesel oil,
while protecting the environment
and keeping our cities cleaner.
And that's pretty slick.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

【TED-Ed】廢油回收利用 - 生質柴油 (Biodiesel: The afterlife of oil - Natascia Radice)

15701 分類 收藏
阿多賓 發佈於 2014 年 6 月 24 日
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔