By Clark, J. The Blackwater River
From (http://fiddlefreak.com/2009/12/08/coal-country-mp3/)
The following paragraphs are for update the scientific stub
in Wikipedia – Blackwater (coal).
During coal preparation, certain wastes like blackwater are
produced. The untreated blackwater can
damage the ecosystems and people themselves. Blackwater contains numerous
amounts of hazardous substances, including carcinogenic compounds and heavy
metals, which make it extremely dangerous; the blackwater damages everything it
touches.
According to 2005’s coal production country list, China
(2,204,729,000 ton) produces the most coal in the world, followed by United
State (531,822,000 ton) and India (407,013,000 ton).
China, as the largest coal produced country, but failed to
hander the coal waste. Certain companies give up the advanced blackwater
treatment, because those technologies are too expensive for them. Eventually
they dig a huge hole in the ground to dispose the blackwater. Every year, 2.5
million ton of untreated blackwater are discharged into the hole. Regardless it
would seep into the aquifer below.
A blackwater recycling system can reduce the damage of
blackwater. There are several types of recycling system, for plant use, garden
use, even for drinking water. The following system is for plant use only. First
of all, let the blackwater settle and added primary colony of bacteria to work
for 24 hours. Then let the backwater goes into three separate rooms, which are
Aeration, Sludge settling and Irrigation.
Aeration step
Once the blackwater is injected into this room, bacterial
settle and multiply on the sludge particles, digesting a variety of nutrients
and oxygen from the sludge.
Sludge settling
After the aeration step, the blackwater goes into a sludge
settling chamber. Sludge sinks to the bottom, and partially treated water is
forced upwards through a mechanism that has another bacteria biomass covering
it. This colony of bacteria then consumes most of the oxygen in the mix and
breaks down any remaining solid particles.
Irrigation
The remaining blackwater passes into the irrigation chamber
where it is clarified and chlorinated. This process required by the local
health authorities.
After the last step, the machine would pump the recycled
blackwater out automatically. The treated blackwater is no longer harmful to
the environment or people.
I have to say, Wikipedia is not reliable
because everybody can create an account to edit the information online.
Beside no one would correct the mistake. Like our TA – Erin Dul said, on
average there are three or more mistakes in Wikipedia. Well, we should never
ever use Wikipedia as our academic research.
I don’t understand why, when I Google something,
the Wikipedia site always pop up in the first place. So when you have no idea
what the topic is, Wikipedia might be a good tool to get an idea what is that.
External Link: http://en.wikipedia.org/wiki/Blackwater_(coal)
We both have the same idea of Wikipedia, unreliable but still useful.
Internal Link: http://www.ales204n-briggs.blogspot.ca/2012/03/wonderful-world-of-wikipedia-wiki-sites.html
