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The Sewage Treatment Process

The Sewage Treatment Process

Wastewater treatment is one of the most common forms of pollution control used in Australia. The country has an immense number of pumping stations, collection sewers and treatment plants. Liquid wastes from homes and businesses are collected by sewers, for delivery to treatment plants, for purification, before discharge to receiving waters or to use again.

By-Jas Engineering designs, manufactures, and commissions a wide range of sewage treatment plants and technologies that are appropriate for industrial and commercial purposes. We offer our technologies, depending on your specific requirements, and considering several factors, such as flow rates (minimum and maximum), environmental regulations, on site effluent reuse and available pathways.

The sewage treatment process works in four stages, as follows:

Stage 1 – Screening

This is the first stage where large objects such as diapers, sanitary items, wipes, broken bottles, plastics, bottle caps and rags are removed. These items may block and damage the equipment. When grit gets washed into the sewer, there is a special equipment to be used.

Stage 2 – Primary Treatment

In this stage of sewage treatment, the organic solid matter (human waste) is separated from the wastewater, by letting the wastewater flow into large settlement tanks, while the solids sink into the bottom. The solids that settled are called sludge.

The scraper at the bottom of the tank moves the sludge towards the middle, where it is pumped away for additional treatment. The remaining water then flows to the secondary treatment process.

Stage 3 – Secondary Treatment

At this stage, the water flows into the aeration chamber. Here, air is mixed with the water to encourage the growth of aerobic bacteria. These bacteria break down the sludge that was not completely scraped in the primary treatment.

Stage 4 – Final Treatment

The wastewater is now almost treated, and it flows through a settlement tank. The bacterial action has produced more sludge, so it is then scraped and intended for treatment. At this stage of the sewage treatment, the water is nearly clear of harmful substances and chemicals. To complete the sewage treatment process, the effluent is disinfected with chlorine, before it is finally discharged.  Chlorine kills disease causing bacteria and it also reduces odour.

The sewage treatment process provides numerous benefits, but the two most important ones are: (1) upgrading of the quality of life and (2) preserving the natural environment. The operation of the sewage system has improved the quality of life of the people that live in areas near the treatment plant, by providing them a healthier and more suitable method of managing liquid waste.

With the sewage system operation, no more ground water pollution happens. Furthermore, sewage treatment plants produce by-products, such as treated bio solids, which can be used in improving the soil for tree cultivation. The system also produces methane; for generation of electricity, which can cover a portion of the power; needed to run the plant.

If you need additional information or you want to request for a free quote, please contact us on (03) 5979 1096 or visit us at

We serve across Australia, the main capital cities, regional town centers and all other regional areas.


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