Tuesday, 25 September 2012
How do we prepare for the inevitable? Obviously we need to use less water, but recycling water is an obvious way of reducing the impact that future water shortages will have on us, our gardens and possibly our livelihood.
How do you save water?
1) Use less - obviously.
2) Collect more with rain water harvesting.
3) Recycle it with a biogas digester catching:
a) all your black (sewage) water and purifying it to a point where it is ready to go into an aerobic plant - like a Biorock (www.biobox.co.za) or a reed bed. Then use that water for irrigation saving yourself money and saving the environment at the same time.
We would all like to think that we are prepared to live with a dry toilet, but for most of us brought up with a flush loo having to have our waste "up close and personal" is a bridge too far. A biogas digester offers us the luxury of a flush loo with none of the guilt of the water wasteage related to it. The water leaving the digester has already been purified to a degree that it only requires further purification in an aerobic system to get it to a point where it can safely be used for irrigation.
b) all your grey (bath/ shower/ basin) water can go directly into the biogas digester (provided you only use biodegradable soaps) where it can be mixed with all your organic waste (food waste/ animal manure/ grass clippings) generate gas and then the overflow water (which is rich in soil enriching nutrients) after some further purification, can be fed to the garden as a liquid fertiliser/ irrigation water.
c) run all your black and grey water into the digester, add organic waste to improve gas yields and then overflow to the biorock/ reedbed and use the water for irrigation
Read this article about the water shortages/ wasteage in South Africa.