wastewater design

All wastewater treatment plants/systems work less efficiently when overloaded with
solid wastes. All reasonable and necessary actions and efforts to restrict the flow of
solid wastes, particularly from the kitchen, shall be encouraged and employed by all
present and future owners/ occupiers/users of this Land Application Facility.

A primary wastewater treatment tank (septic tank)

e will need to meet all design, standards and local government requirements,

e will need to be desludged regularly,

e may need a baffled/wiered distribution box set level on 0.9 x 0.9 x 0.1m concrete
to evenly distribute the effluent into the trenches/beds, if and as required by the
design.

Garbage grinders are not to be installed on an Advanced Enviro-septic System as their
use introduces additional solid matter, which must be broken down by the bacteria.
Their use also greatly increases the hydraulic load entering the system.

The choice of cleaning products will influence the environmental impact of
greywater and, equally, will influence the overall performance of treatment
within the septic tank. Only genuine biodegradable products and products with
low phosphorus should be used. Common washing powders contain sodium salts
as bulking agents which produces a saline greywater. Powdered products which
use potassium salts or liquid concentrates produce better quality greywater.
Some detergents and powder cleansers contain boron which not only can be toxic
to plants in high concentrations but can also be toxic to animals.

Operation.

This Land Application Facility shall be used only for effluent application and not used
for purposes that compromise the effectiveness of the system or access for future
maintenance purposes.

In order to reduce sludge build-up in the tank and pipework do not dispose of used
cooking oil grease/fats or food scraps or similar material down the sink.

Do not allow newspapers, disposable or sanitary napkins, rubber products, nappy
liners, cotton buds etc. to enter the system. The use of better quality toilet paper can
also help in improving operation of the system.

Do not allow excessive quantities of disinfectant liquids, bactericides, antiseptics,
strong caustics, acids, alkalis or chemical detergents to enter the wastewater system.
Their use can severely affect the bacterial, biological and chemical processes within
the system. Minimise their use and use more environmentally friendly products.

Where possible, the owners/householders/users should avoid shock loading of the
system, for example, by staggering the hours that the washing machine is used, and
the peak times in the bathroom. Washing machines should be used where possible
throughout the week instead of several loads within one day.

 

Unearthed Geotechnical P/L. 15 Design Report 022-003