The Envirotech ASF (Aerobic Sand Filter) wastewater treatment system

NO CHEMICALS NEEDED – THE NATURAL WAY – SIMPLY THE BEST!

The Envirotech ASF uses the latest and most appropriate technology available. It was designed by an engineer who is one of Australia's foremost specialists in the field of onsite wastewater treatment and disposal systems. It is also appropriate for commercial developments such as caravan parks, motels, shopping centres and schools.

Unlike any other secondary treatment system currently available, the Envirotech ASF does not use mechanical aerators, diffusers, blowers or other costly moving parts, or artificial media material.

A well designed and carefully constructed buried Aerobic Sand Filter offers secondary treatment and "polishing" of the effluent in a completely natural way. The ASF has been designed using the engineering principle of the Long Term Acceptance Rate (LTAR). This ensures that the ASF has a long life without hydraulic surcharging.

Benefits of the Envirotech ASF include:

• It is the most cost-effective system available. The system requires the LEAST MAINTENANCE (only ONCE-A-YEAR servicing, where all other system types require quarterly servicing); there is a minimum of mechanical equipment to wear out and need replacing; and there is negligible electrical power consumption (the filter and effluent pumps run for only approximately 10 minutes per day).
• It has the most consistent and highest quality effluent of all systems. Its extremely stable process can withstand wide fluctuations in both hydraulic and organic loading without any reduction in effluent quality.
• Disinfection occurs NATURALLY without the addition of chemicals such as chlorine, which can be associated with negative environmental effects. The ASF has the added capability to deactivate/remove viruses and Helminths which chlorination of a secondary effluent cannot do. (It is interesting to note that viruses are responsible for 70% of illnesses in man today.)
• It is a long-lived, trouble-free system. The life expectancy of the sand filter is well in excess of 15 years.
• Individually designed systems to suit all specific needs, with low visual impact.

The Envirotech ASF process:

The Envirotech ASF system has been developed for the treatment of all household wastewater to a standard suitable for the renovated water to be irrigated onto lawn and garden areas. It is the "engineered" alternative to the conventional septic tank system without the high maintenance costs inherent with mechanical aeration plants.

The ASF system utilises natural processes of settling and filtration in an environment whereby organisms beneficial to the breakdown of wastes may flourish.

It is simple but clever. All household wastewater is directed to the one house drain (just like being connected to town sewerage) which leads to a large capacity primary treatment chamber (high surface-area-to-depth ratio). In this chamber, naturally occurring bacteria start the treatment process by breaking down the settled solids through anaerbic digestion. Fats and other light matter float to the surface and form a scum. The liquid wastewater (called "mixed liquor"), which has now had a large proportion of the suspended solids removed, flows into a pump chamber where, by simple float switch control, it is pumped onto the buried Aerobic Sand Filter.

This well designed and carefully constructed sand filter offers secondary treatment and "polishing" of the effluent in a completely natural way. Liquid wastewater from the primary treatment pump chamber is dose-loaded onto a bed of clean crushed rock. From there it percolates slowly down through the various layers of specially graded sand and rock. Physical, chemical and biological processes occur naturally within the ASF to remove organic material and, most importantly, harmful bacteria, pathogens and viruses.

At the base of the fully lined ASF, the renovated water is collected and drained to a pump chamber ready for re-use on your lawn or garden. This is re-use that is without the need to add chlorine or other disinfectants which can produce residuals and compounds regarded in many countries as unacceptable contaminants.

For your further information . . .

Wastewater Disposal Areas
There are various ways of disposing of the treated wastewater, which will be decided between your local Council and (in most instances) your Geotechnical Engineer. The simplest way is by above-ground heavy droplet spray, but other methods are shallow subsurface irrigation, evapotranspiration beds or pressure compensating drip systems. Once the method of disposal has been decided, we will provide you with a firm quotation for the installation.

Polishing Unit
This   item is also known within the industry as an EPU (effluent polishing unit) which comprises a rapid sand filtration unit. Some of our local Councils require the addition of these units to all treatment plants installed within their shires, which they claim are designed to improve and maintain the quality of the treated effluent. Should your Council require the attachment of an EPU, we will fit an Onga LSF20" unit to your system.

Site Inspections
Site inspections to your block are easy - just call us.

Excavation
We can provide the excavation service for your treatment plant and/or rainwater tank. This service also includes the required bedding sand, loose backfilling and water. Of course if you wish to provide the excavation yourself, that's OK. We will provide you with a drawing showing the dimensions of the hole to be excavated, the amount of bedding sand required and instructions for filling with water.

Delivery & Placement
Unless otherwise requested, all our quotations include the freight to cart the treatment plant tank to your site, and the crane hire to unload the tank and place them into the prepared excavation (yours or ours).

Treatment Plant Owner's Guide
As part of our commitment to excellent customer service, we have produced an Owner's Guide for your treatment plant. The guide is informative, easy to read and is provided to assist your understanding of your treatment plant.

And very importantly . . .

Our Hand-Over
This is a service provided exclusively by Smart Sewage Solutions. After your treatment plant has been commissioned for use and you have (or are just about to) move into your new home, we will arrange to meet you onsite. Here, we will introduce you fully to the treatment system, explain its correct operation, provide you with an Owner's Guide, and answer any queries you might have.