Questions and answers about wastewater

Used water from toilets, bathrooms, kitchens, laundries, hospitality venues and industrial processes is known as wastewater.  Ninety-nine percent of this wastewater is water, the other one percent is the contaminating waste.

Much of the wastewater we produce turns into wastewater due to;

  • warming or cooling it,
  • adding human wastes;
  • adding oil, grease or fat;
  • adding organic matter such as food wastes; and
  • adding poisons such as pesticides, some organic compounds, synthetic chemicals and heavy metals.

Remote Water Treatment Services assists with the process of wastewater treatment throng our sewerage treatment plant for treatment before it is released back into the environment.

Where does industrial wastewater come from?

Sources of wastewater include hospitality establishments, shops, offices and factories, agriculture, heavy wash vehicles, transport and fuel depots, vessels, quarries and mines.

Wastewater from manufacturing and industrial operations such as food processing or metal refining is industrial or trade waste. This includes liquid waste from any process (e.g. water used to cool machinery or clean plant and equipment).

What is the wastewater treatment process?

The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.

In Queensland, most wastewater is treated at sewage treatment plants. Wastewater is transported from industrial sites through a system of sewers and pump stations, known as sewerage reticulation, to a sewage treatment plant.

At Remote Water Treatment Services we process wastewater through a 5 stage process:

  1. Pump stations
  2. Raw Screening
  3. Biological Process SBR
  4. Final Disinfection Process
  5. Treated Effluent Discharge

What happens in a wastewater or sewage treatment plant?

Wastewater treatment occurs in three stages:

1—Primary treatment

Removes solid matter. Larger solids, such as plastics and other objects wrongly discharged to sewers, are removed when wastewater is passed through screens. Grit tanks cause small, heavy particles like sand to sink to the bottom of a tank and a scraper removes it.

Wastewater then flows into large tanks where solids settle and are removed as sludge. Grease and scum are skimmed from the surface.

2—Secondary treatment

At this point the wastewater looks relatively clear. But there are still bits of organic matter and dissolved nutrients that need to be removed.

Uses tiny living organisms knows as micro-organisms to break down and remove remaining dissolved wastes and fine particles. Micro-organisms and wastes are incorporated in the sludge.

Next, we separate the activated sludge from the treated wastewater. The treated wastewater flows to tertiary treatment. The activated sludge is turned into biosolids.


Removes disease-causing micro-organisms by filtering the water and disinfect it with chlorine or ultraviolet light (UV). This kills any remaining microorganisms.