Biological purificn of waste water and sewage - for small communities by total oxidn. process

摘要

Biological purifcn. process is intended for waste water and sewage coming from small and medium sized communities. It is of the total oxidation (or extended aeration) type in which the crude effluent is admitted directly into an oxidn-settlement tank; this is equipped with a floating turbine which stirs and homogenises the medium with an intense introduction of oxygen. This causes direct oxidn. and allows the aerobic bacteria to live and multiply. After the aeration phase, the turbine is stopped to allow settlement to take place; the sludge falls to the bottom and the upper layer rapidly becomes limpid; it is evacuated through an automatic overflow valve. After the evacuation of the purified water, the valve closes and the plant is ready for a new aeration cycle.