Curious Kids: Where does my poo go when I flush the toilet? Does it go into the ocean? (2024)

Curious Kids: Where does my poo go when I flush the toilet? Does it go into the ocean? (1)

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  1. Ian A. Wright

    Senior Lecturer in Environmental Science, Western Sydney University

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Ian A. Wright does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

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This is an article from Curious Kids, a series for children. The Conversation is asking kids to send in questions they’d like an expert to answer. All questions are welcome – serious, weird or wacky!

Where does my poo go when I flush the toilet? Does it go into the ocean? – Clancy, age 4, Austinmer, NSW.

When you press the flush button, your wee, poo, toilet paper and water go down a pipe called a sewer. The toilet flushes the wastes down the sewer pipe. The sewer pipe from your house also collects and removes other wastes. This might be soapy water from baths and showers, or water left over from washing dishes and clothes. Together, all of these wastes are called “sewage”. The pipes they travel through are called “sewerage pipes”. People sometimes get “sewage” and “sewerage” mixed up.

The wastes from your house flow downhill. They join those from other homes and flow into bigger sewer pipes. Some of these pipes are bigger than a bus! If you live in a big city the wastes from thousands of people looks like a river of sewage.

The big sewer pipes take all the sewage to a place where it is treated. This place is called a sewage treatment plant. All towns and cities have these. They are like a big factory where any harmful materials are removed. This is a very important part of our city life.

Sewage contains lots of germs and if people come into contact with it, it can make them very sick. The treatment also removes things that people have flushed down the toilet. This includes things like toys, jewellery or even money. There are some things you should never flush down the toilet, like baby wipes – even if it says “flushable” on the packet – because they clump up and cause big problems for the sewerage system.

The sewage is cleaned in the treatment plant. This can take many days. It makes sure that harmful parts of the sewage are removed. Chemicals are added to kill as many germs as possible. Then the treated water is released into a local river or even the ocean. If you live near the coast your treated sewage probably goes into the ocean.

The treated sewage is cleaned to make sure that it does not cause environmental problems. This means that it should not harm the plants and fish that live in the river or ocean where it is released. If the sewage is not fully treated it can cause water pollution. It also should not make people sick if they swim in the river or ocean. Scientists test the water and the sewage wastes to make sure that it is OK.

Some treated sewage can be used to make energy or recycled to make water that can be used in factories or farms. Some countries, including parts of Australia, can even make water from treated sewage that is safe enough to drink. Singapore makes “recycled” drinking water out of treated sewage that is even purer than the level that the World Health Organisation (which is a group that makes a lot of suggestions about what’s healthy and what’s not) says is safe to drink.

Hello, curious kids! Have you got a question you’d like an expert to answer? Ask an adult to send your question to us. You can:

* Email your question to curiouskids@theconversation.edu.au
* Tell us on Twitter by tagging @ConversationEDU with the hashtag #curiouskids, or
* Tell us on Facebook

Curious Kids: Where does my poo go when I flush the toilet? Does it go into the ocean? (6)

Please tell us your name, age and which city you live in. You can send an audio recording of your question too, if you want. Send as many questions as you like! We won’t be able to answer every question but we will do our best.

  • Sewage
  • Toilets
  • Sewers
  • Water treatment
  • Curious Kids
Curious Kids: Where does my poo go when I flush the toilet? Does it go into the ocean? (2024)
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