2016-07-12 - Item 14 - Att 1 - Effluent Disposal Planning Study

                  attract pests (mosquitoes, flies and rodents)
                  contribute to the pollution of groundwater, streams and waterways
                  cause degradation of soil and vegetation.

       Owners/occupiers play a crucial role in ensuring that on-site sewage treatment plants are
       regularly maintained and that the system continues to effectively treat the waste water. The
       failure of on-site sewerage systems is generally attributed to one of three factors:
                operation of the system (loading rates, mechanical malfunctions, pump failure)
                maintenance (lack of regular servicing, maintenance and testing)
                siting and design issues (soil types, subsurface water entering system during
                   flooding events)


3.2        Types of Systems
In Queensland the two most common types of on-site wastewater treatment systems are: –
           Primary systems - septic systems where biological processes treat waste which is
            subsequently discharged below ground
           Secondary systems - on-site plant employing mechanical, biological and filtration
            processes to treat waste with discharge either above or below ground.
For legislative purposes the secondary systems are classified into subgroups of secondary quality,
advanced secondary and advanced secondary with nutrient removal. All secondary systems
require the prior approval of the Queensland government before they can be released to the
market. Each system must be accompanied by manufacturer’s specifications, with compliance
with the specifications being a condition of approval for installation.

Figure 3 - Sand Filtration System




On-Site Effluent Disposal in Noosa Shire 2016                                                Page 7