Septic Tank Effluent Gravity - Septic Tank Effluent Pump

A sustainable solution for decentralized and rural wastewater collection is an effluent sewer. There is widespread failure of many rural communities using septic systems. Often growing communities are unable to accommodate additional septic systems. The growth in larger communities often finds the existing sewerage system unable to take new connections.

Effluent sewers are a cost effective and sustainable solution for rural areas and fringe development on the outskirts of communities that do not want to, or are unable to expand the existing sewage system.


How an Effluent Sewer System Works

In an effluent sewer system each individual site has a small, underground tank (interceptor tank) which receives all the waste from the dwelling.  The raw wastewater separates into sludge, scum and liquid effluent with primary treatment taking place within the interceptor tank.   The solids remain in the tank for years, with the anaerobic biological process consuming the solids over time.  Most tanks will only need to be pumped out every 7 to 10 years.  The liquid effluent remains in the tank for only a day or two, it is then pumped (STEP) or gravity fed (STEG) to the next treatment point.  Both types of connections can exist on the same collection network.

Innoflow STEP wastewater system.JPG

The Benefits of an Effluent Sewer

Because only liquid effluent is pumped intermittently, using small and energy efficient pumps (generally the PF100552 half horsepower pump is used) the electricity cost to the home owner is minimal.        

Effluent collection lines are generally much smaller than standard sewer lines, typically they measure 50 - 100mm in diameter and can be shallow buried following the contour of the site.  This reduces install costs as well as the impact on the environment

No expensive pumping stations are required, and the water tight effluent sewer system does not require manholes.

In systems built to serve new subdivision developments, the cost of the on-lot equipment is taken care of by the homeowner, so up front investment by the developer or local authority is minimal.

Service can begin as soon as the first home in the subdivision is connected. There is no minimum flow required for an effluent sewer.

Sludge management is greatly reduced through the natural ,passive ,anaerobic digestion in the on-lot interceptor tanks, simplifying the design of the treatment plant and minimising whole-of-life costs.

As primary treatment takes place at each home or business, abuse of the system, such as disposal of chemicals, usually affects only the household responsible.


Managing Effluent Sewer Systems

Remote monitoring allows efficient management of the systems.  The AdvanTex® treatment systems are controlled using TCOM telemetry control panels from Orenco.  In many cases the operator can diagnose the problem remotely and adjust settings to correct it.  STEP units at individual homes can be fitted with VeriComm control panels.  The VeriComm panels communicate via phone line to the system operator to alert to any problems. If a site visit is required, the operator can arrive prepared with information about the likely cause of the problem, such as a stuck float or a leaky toilet.                   

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