(3)Cleansing pollutants from daily life.

We need to clean the pollutants produced by our daily life. As with any other problem, the best way is to solve it at its source. Human bodily waste and garbage from the kitchen are converted into biogas for cooking. The carbon dioxide from burning biogas flows via a duct from the kitchen to the green house where it gets converted to oxygen by photosynthesis, as can be seen in the next figure. It is well known that the more carbon dioxide a plant gets, the more it will grow. The waste water from the house flows to the greenhouse into an aerogation pool and then successively through other ponds. In the first one bulrushes grow, in the second water hyacinth as an additional source for biogas was planned, however, this idea had to be abandoned as the plant is considered noxious in New Zealand. For the third pond we are considering growing watercress. However, as we have up to now not lived in the house for more than four months a year, not enough waste water has been generated to reach the third pond. Water reeds among bulrushes and other weeds in the first pond are growing, showing that they are able to thrive on the gray water.

Greenhouse and cleansing ponds

The first measurement of BOD value, on 1996 May 31, was 135ppm at the entrance and 85ppm at the exit in the first pond. The second was 170ppm at the entrance and 21ppm at the exit. It is evident that the change to biodegradable detergent for washing dishes and laundry has had a great effect.