Kw-logo-smaller

Sewage Treatment: After the Flush

Once upon a time, cities didn't have sewage systems so all the stuff that you would flush down the street today would have been thrown into the streets in those days. In fact, many developing countries still do that. Sewage treatment might sound pretty gross, but things sure would be a lot more gross without it. Let's look at how it works.

Sewage - The Basic Rundown

It's standard in the North America to break down sewage treatment into two categories - storm sewers and sanitary sewers. Storm sewers get less treatment - or sometimes none at all. Sometimes it may be processed to remove stuff like car oil. Sanitary sewers are processed to clean up human waste (yup, we're talking about what you think we're talking about - poo). There are many methods for dealing with human waste. The generally accepted method in North America consists of three stages. Check 'em out.

Sewage Treatment - Primary Treatment

This stage begins when your house's pipes connect up with the sewer. When the waste arrives at the treatment plant it goes through "foreign-object protection." The big pieces of waste get filtered out in this stage. The waste goes through a series of filters to get rid of pieces as varied in size from a few feet wide (eeeew, how did that get in there?!) to pieces the size of sand. This stuff all goes to the landfill. Now sewage is separated into sludge and liquid waste.

Sewage Treatment - Secondary Treatment

Secondary treatment removes bacteria and nasty smells from the sludge and water. It usually uses bacteria to consume the available nutrients and organic compounds. Inorganic salts, carbon dioxide and water are left behind. The basic treatment for the sludge is digestion. That's right: it gets eaten! The sludge is pumped into concrete disgesters where bacteria eat the sludge and produce methane. The sludge is drained of any remaining water. The dry sludge can then be sold to farmers who use it to enhance their soil.

Sewage Treatment - Tertiary Treatment

Tertiary treatment, which means the third level of treatment, removes all the rest of the junk from the remaining water, to restore it to a more natural state. Nitrates and phosphates are usually the most dangerous chemicals left in the water. Algae and rotifers (aquatic organisms) are used to absorb these chemicals. The water is sterilized and then released back into oceans or streams.

Related Stories:
0 Comments

latest videos

F1098487689843

Ever Found a Crocodile in Your Toilet?

  • Yeah! That was scary.
  • No - like crocodiles could get into my toilet.
  • Not yet, but it would be cool if I did.

related stories

Random in the forums

PrincessAmelia
PrincessAmelia posted in General:
gvfoooooooooekfdkjl [Duh! :D:D] Where is the rookery of Penguins?
reply 8 minutes
XxtripleawesomexX
In my opinion, no. It didn't live up to its expectations. I thought the AST part was cool but after that was terrible. I thought it would have like, more explosions and maybe even Gideon or Ilona dying, but no. That's what made this game horrid. All I'm saying is, you don't buy a game for sixty bucks and not get your money's worth.
reply about 1 hour
Navodya
Navodya posted in General:
MaDaRaHeCk 
reply about 2 hours
kareena_12
kareena_12 posted in General:
wiki156
reply about 2 hours
Navodya
Navodya posted in General:
yeah ! 
reply about 2 hours

play online games