The waste tanks are now fitted to the truck, i have started some of the wiring and pipework. One of the interesting things here is the oxygenation system, it slowly bubbles air through the wast tanks to increase the oxygen level in the waste. The science behind this is as follows.
Both aerobic and anaerobic bacteria exist naturally in raw sewage, but only the anaerobic cause unpleasant holding tank odors.
introducing a continuous flow of air into the holding tank through a submerged bubbler upsets the balance between aerobic and anaerobic bacteria. The process establishes an oxygen-rich environment in which anaerobic bacteria cannot survive. When the anaerobic bacteria are gone, so is the odor. I am bored with wast tanks now so i think i will weld some steel tomorrow !!