Project Description

Every day, every hour, every minute, toilets, sinks, washing machines, drains, showers, sprays, dishwashers, and other household fixtures utilise water and produce sewage throughout Moreton Bay and the Sunshine Coast. The average person produces 162 litres of sewage every day.

What Is Sewage?

Most sewage (99%) is simply unclean water. The remaining portion consists of solids, chemicals, lipids, nutrients, nastiness, and a few things that shouldn't be in the sewage system. Poop alone is not sewage. Additionally, it includes anything you flushed down the toilet, sink, or drain. We carefully remove and treat all sewage from your residences, workplaces, and educational institutions every day. We're quite busy behind the scenes, and today you get to tag along. We'll demonstrate what we do and why it's so crucial to society. Did you realise that water is never created from scratch? The exact same water is continuously used, cleaned, and treated.

Natural water cycle

Mother Nature used to clean the water through the natural water cycle before the world's population increased significantly and before there were always homes and other structures. Rain would fall on the earth, evaporate to form clouds, and then return as rain, snow, or sleet. But because of our increased water use and pollution, nature will no longer be able to keep up.

Urban water cycle

The urban water cycle is now available to assist Mother Nature. Huge dams are used to store water when it rains. Before it is ready for use by you, it is processed. After you use the water, we pump the sewage and subterranean pipelines to a sewage treatment facility where it is cleaned and processed before being securely released back into the environment. Our bodies are healthy, and our waterways are clean thanks to sewage treatment.

Sewage without proper treatment can have a negative effect on both our environment and our health. Numerous children in impoverished nations continue to perish each year from illnesses brought on by poor sanitation.

In fact, the flush toilet has been deemed the most significant advancement in medicine during the past 150 years. We treat about 100 million litres of sewage daily here at Waterman Australia. That is equivalent to several Olympic-sized swimming pools. Just consider what would occur if we didn't clean and treat it. What would become of it? What effects would it have on our health and the environment?

The sewage treatment process

Sewerage Network

Find out what happens if all that sewage flows to your sink or toilet by following us. Pigs on noses were ready to travel through the sewer network when he said this. Sewage enters a vast network of pipes that link your home to the sewerage network when it is flushed or drained away from your home. The entire system of sewer pipes, pumps, and treatment facilities is known as the sewerage network. Consider that raw sewage is currently travelling to a sewage treatment plant underneath.

Inlet works

We screen the sewage when it gets to the treatment facility to get rid of all the undesirable items. We discover a wide variety of odd objects that shouldn't be there, including toys, false teeth, jewellery, and even underwear. Additional items that pose serious issues for the treatment plant include nappies, cleaning wipes, baby wipes, and fats and oils.

Balance Tanks

When all the sewage has been filtered, some treatment plants have specific tanks that house it all and limit the amount of sewage that can enter the facility at once. This ensures that the treatment is always of a high standard.

The Bioreactor

The treatment procedure begins when the sewage is released from the holding tanks. One enormous science effort is sewage treatment. It's a difficult procedure, and we need a little assistance from our good friends, the friendly bacteria. Fortunately, these large, voracious men enjoy eating all the organic materials in the sewage that we want to remove from the bug.

These creatures consume all the carbon and lower the phosphorus and nitrogen levels in the sewage, which can have an adverse effect on the health of our rivers. We therefore feed them in enormous bioreactors that are highly oxygenated. They can breathe, eat, and have a lot of hungry young. Are they becoming more and more prevalent?


Move the sewage onto specialised clarifiers to separate the solids from the water once all the nutrients have been consumed. sludge or bio solids are terms used to describe solids.

After the sewage arrived at the sewage treatment plant, between 24 and 48 hours later. It has been cleaned, screened, filtered, disinfected, and tested. It has also been eaten up by bugs and broken down. Now that the water has been cleaned and treated, it is prepared to proceed through the urban water cycle.

Although the procedure is intricate, the job at Waterman Australia Water is never finished. We all consume water, and every day we all produce sewage. Run the water, use the toilet, do the dishes, and take a bath. When you're through, the cycle repeats, and our staff at Waterman Australia is there to safeguard both you and the environment.

How do Sewage treatment plants work.?

Sewage from our houses, hotels, industries, and other facilities is transported via sewerage systems in cities and towns to sewage treatment plants, where it is cleaned up and then certified safe to release into other water sources.

Wastewater is treated through several stages and procedures in order to remove contaminants.

1. Physical contaminants

2. Chemical contaminants

3. Biological contaminants

Pre-treatment process

In the pre-treatment stage, the sewage is passed through grids or vertical bars that can filter out big solids like paper, plastic, and metal cans.

Primary treatment process

Sand, pebbles, and soil sink to the bottom of the grid chamber because of the slow flow of sewage during the first treatment process.

When wastewater enters the settling tank or sedimentation tank, where solid wastes like faeces are permitted to settle, wastes like soap, oils, and grease rise to the surface. Sludge and scum are the names for the waste material that sinks to the bottom and floats to the surface. After that, scum and sludge are removed every several days using the scraper and skimmer, respectively. Clarified water is the term for the water that is not used.

Secondary treatment process

Organic or biological wastes are eliminated during the secondary treatment procedure. The process is biological. This is performed by transferring the purified water to an aeration tank equipped with air blowers that create bubbles of air to encourage the growth of aerobic bacteria that consume organic pollutants including food waste, faeces, and other creatures. Activated sludge then gravitationally separates out of the mixture as it moves from the aeration tank into the clarifier.

The digester is where anaerobic bacteria break down the activated sludge that has been created together with the sludge from the primary phase. The remaining water in the activated sludge drains through the sandpits after some of it evaporates from the mixture. The remaining dried sludge is then left behind and can be used to create compost or fertilisers.

Tertiary treatment process

In the tertiary treatment stage, the leftover wastewater is treated with chlorine to remove microorganisms, phosphorus compounds, and nitrogen compounds that includes chemicals. To eliminate the microorganisms, chlorine pills are administered. Chlorination is the name of this procedure. The water is then directed into the bodies of water.

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