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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.

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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.

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-Oracle-
-Oracle- posted in Debating:
Where one teacher stands in front of 20 kids, each one having different strengths, different needs, different gifts, different dream. And then teach the same thing the same way? That's horrific.Curriculums are created by policy makers. Most of which have never taught a day in their life. Just obsessed with standardized tests. They think bubbling in a multiple choice question will determine success.
reply 20 minutes
Powerslave
Powerslave posted in Debating:
The education system isn't there to create intelligent individuals and definitely not there to teach, it is there to create useful pawns for the elites, we are all brainwashed from day one. So yes I think they should change,  but they most likely won't.
reply about 2 hours
naruto200
naruto200 posted in Debating:
If you are a student in middle through high school these days you might  not feel like you are learning a lot of things that you will use after high school. The truth is, you aren't. Are they teaching you how to obtain money? How about  how to manage a check account? Or how about this are you learning how to handle a job interview in school. No? Maybe you have learned  one of them perhaps if you count elementary, but dude we're way past elementary and ever since the fith grade I aint lean nothing about anything i'l use outside of school since 5th grade. Oh wait, I DID learned something. I learned that half the stuff they teach us are not even on the tests we HAVE TO take. Probably because we should know the information already, but the thing is MOST of us in the U.S don't know half of it or care because it's all useless to us so it has to be re taught again. Some teachers are kind enough to re teach old lessons but  not all do, and I can't believe that i discovered that all it takes to make things right is for a student to confront a teacher in class to ask them to teach me things that we will use in our future, not yesterdays future. If no one does that IN CLASS, IN FRONT of the class. You are just one student, you might save yourself but not the others if you do this alone.. If other unsaved students slow down the class you won't learn a thing. What do you think? about this subject?
reply about 3 hours
KITTENLOVER102
KITTENLOVER102 posted in General:
it is a colorful tiger
reply about 3 hours
aditicoolsome
aditicoolsome posted in General:
its me 
reply about 3 hours