Okay so after much discussion with council we have decided to go with the Super Treat system - and council will approve it. Its not as eco-friendly as the other systems (we still have to put chlorine tablets in every 3 months) but its better than pouring chemicals into a holding tank and getting that hauled away.
Having said all that, I have to admit, I was at a real loss with all the systems actually on offer and today, I finally cracked it and started to draw every system we have looked at as a diagram... I tend to think in pictures.
For those who are looking at building their own house in the future, here is a rundown of
my interpretation of the systems. Please contact suppliers themselves over the ins and outs. :-)
BiolytixThis system won an Environmental Protection Agency award. Basically it goes like this:
Grey water (eg. laundry and shower) AND Black water (eg. toilet and kitchen sink)
goes into
chemical-free processing tank (uses combo of worms, soil (ie filtration) and aeration)
goes into
underground hoses under the property land
The water can not be diverted to vegie gardens but can be used for ornamental gardens. Downside is that relying on this system alone would mean we would need to use our fresh water to wash our cars, climbing equipment etc etc.
More info at:
www.biolytix.comPerpetual WaterThis system is fairly new but has gotten endorsement by the ACT Master Builder's Association, the Master Plumber's Association, the Housing Industry Association and the Australian Water Association.
This was the system that council did not approve because they did not want any of the water to be used above ground. Having said that, this system has got NSW Health Accreditation and is in use quite widely here in Canberra.
The process basically goes like this:
Grey Water
goes into
processing tank (uses settling and filtration (not biological filtration though) method - small amount of settling agent)
goes into
storage tank (add small amount of chlorine)
goes into
Toilet OR laundry OR showers OR hand-held hoses OR above ground sprinklers OR drip hose
The great thing about this system is that it would have given us the flexibility to re-use the water to clean our cars etc. Like the Biolitix, however, we can not use the water for any vegie gardens. Further, it does not treat black water. That was why we were hoping to use this in combination with the Biolytix.
More info:
www.perpetual.com.auSuper Treat Sewage SystemThis system is the oldest of the eco-friendly on-site treatment systems sold in Australia. They are approved in all Australian States and also in New Zealand.
Process is like this:
Grey water AND Black water
goes into
processing tank (uses settlement, compost and aeration - add small amount of settling agent)
goes into
24 hour holding tank (add small amount of chlorine)
goes into
under-ground hoses, OR above ground sprinklers, OR hand-held hoses, OR drip hose
Further there is an add-on to this system where we can install a UV filter so that we can store the grey water indefinitely safely for re-use. The reason why grey water needs to be used within 24 hours is that it could develop pathogens and spread disease. The UV filter will get rid of pathogens.
Anyway, so that's a run-down of how I see on-site wastewater systems.
More info:
www.supertreat.com.auNext big decision for us is to decide whether we go with a totally eco-friendly oven (ie one that doesn't leak air) or a "normal" oven and make the eco-friendly saving elsewhere.....