WeCo’s public toilets use a state of the art technology capable of saving, retrieving and upgrading water and waste.
– A flush in closed circuit –
At first glance, WeCo toilets seem to be simple and conventional toilets.
But, after the utilization, the water from the flush is retained and filtered by a sophisticated system in order to be reused for the next flushes.
The filtering process disinfects the mix and kills bacteria and pathogens and lowers the ammonia concentration of urine. In the end, the process generates reusable water.
– Filtration and electrolysis –
The flush transports the raw material (urine and feces) into a tank. The feces are denser and they will sink to the bottom of the tank. Then, a pump will push the liquid part and the little remaining solids into another tank.
Then, the urine is put into an electrolysis cell. This specific equipment will react with the urine, thus producing ion and chlorine compounds.
It is those chlorine compounds (chlorine and chloramine) which will destroy the bacteria and purify the urine.
– Clean water and fertilizer production –
The purification stage can last between one and four hours depending on the quantity of solids and liquids contained in the tank at the beginning of the process.
The settled sludge is collected on a regular basis. It can be used as compost and/or be transformed into fertilizer.
Regarding the clean water, it is treated one last time by passing through different filters (active carbon, micro-membrane). It will clean the water of all traces of bacteria. This stage also lowers chlorine concentration.
Purified water is then stocked to be re-used in the toilets. The surplus can be used to water plants for example.