Wastewater treatment plant installation process
How we find the perfect wastewater treatment solution
There is a significant process involved in pricing a septic system or wastewater treatment plant. Expenses are broken up into two categories, upfront and ongoing. Each property must be assessed on a case by case basis, there is no ‘best system’, only the system which will work best for your home.
Book an AWTS specialist
Factors to consider when choosing a wastewater system
Many factors need to be considered when choosing the right wastewater treatment option including:
- Soil type - the permeability of the soil, depth of soil, water table depth, etc. These factors will affect the size of the disposal area and may preclude the use of some methods.
- Setbacks to water - creeks, dams, bores, open drains, intermittent watercourses and gullies
- The slope of the block
- Setbacks from dwellings or recreation areas
The process to determine a system and price
- Our team will conduct a desktop study to determine the possible system options suitable for your property. We will study resources such as council overlays, aerial photography of the area etc to make a preliminary assessment.
- An Express Wastewater member will attend the site and mark out the location for a soil test.
- Specialist soil technicians will drill and classify the soil.
- Using all this information our team can then assess what alternatives are available for your property and make expert recommendations on the best couple of options for your project.
- A detailed quote will be prepared for your project and once you are happy we can begin designing the system you have selected.
- The wastewater treatment system design is then submitted to your local council for approval and once received the project will get underway.
Types of systems and price guide
The price of a septic or wastewater treatment system will vary significantly as so many factors need to be considered which makes it very difficult to provide an accurate price guide.
There are 2 broad categories of wastewater systems, passive (no servicing is required) and active (regular servicing required).
Passive wastewater treatment systems
A passive wastewater system can only be distribute treated water below ground using methods like long narrow absorption trenches or wide shallow absorption beds.
Primary effluent septic tank and trenches
This type of system has the lowest level of treatment and therefore requires the furthest setbacks from water. This means an allowance of 50 m from any waterway, creek, dam, or open drain etc. and 1.2 m from the bottom of the trench to the water table needs to be allowed for.
The price of a septic tank system varies a lot due to soil permeability as much of the cost is in the trenches. The extent of the absorption trenches can easily double or halve in size depending on soil permeability in the application area.
The major advantage of the primary effluent septic system is no servicing is required and if you can get fall from the tank to the trenches, power or pumps are not needed as well.
Passive sand filter wastewater system
Like the primary effluent trenches, the major advantage of this system is servicing is not required and if the land enables a fall from the sand filter tank to the trenches there is no need for power or pumps.
This style of system is also very dependent soil type and permeability when determining the costs. The sand filter systems will treat the wastewater to a higher standard than a primary effluent trench which allows for more flexible placement options as they are able to be located closer to waterways. They are, however, generally more expensive to install than primary effluent trenches.
Active wastewater treatment systems
Active wastewater treatment systems are normally the most versatile of options as they can be used in a huge variety of locations. This style of system can usually (depending on council area) dispose of treated effluent above and below ground depending on site conditions which can provide added irrigation for your property and more flexible distribution of wastewater.
Serviceable sand filter wastewater system
Serviceable sand filer systems offer slightly cheaper servicing expenses than an aerated system and do not require an air blower. They are, however, generally considerably more expensive to install.
Aerated wastewater treatment plant
An aerated wastewater treatment plant is generally the most versatile system, as well as being the cheapest system to install. This style provides good clean water in a wide variety of sites. Depending on invert heights and the level of treatment, one of these treatment plants will generally cost between $7000 to $10,000 including spray irrigation to install.