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Water polluted by a mixture of all sorts of inorganic (sand, clay, salts, ...) and organic (proteins, sugars, oils and fats,...) components. Some of them appear in dissolved form and other in suspended form. The polluted water is from industrial, agricultural or municipal origin.
Wastewater treatment =
The process that removes the majority of the contaminants from wastewater or sewage and produces both a liquid effluent suitable for disposal to the natural environment and a sludge.
The process includes a combination of mechanical, physicochemical & biological treatment steps.
Biological wastewater treatment =
Collective name for the processes that eliminate the organic matter using micro-organisms. Nutrients such as N (nitrogen) and P (phosphorus) can also be removed, thereby reducing the eutrophication risk.
Biological treatment is actually the accelerated version of nature's own way of water cleaning. It produces a clear effluent, harmless for the environment, by removing organic compounds from the wastewater, as well as nutrients such as N and P. From the economical point of view biological treatment is the most feasible method.
The WATERLEAU Lucas® system is an advanced evolution of the most common biologicaltreatment method, using activated sludge.
Activated Sludge =
|A variable and mixed community of micro-organisms in an aerobic aquatic environment.|
These micro-organisms derive energy from organic matter in aerated wastewater for the production of new cells while simultaneously producing energy through the conversion of this organic matter into compounds, such as carbon dioxide (CO2) and water.
The activated sludge process consists of a series of consecutive process steps:
There are two methods for establishing these consecutive steps:
Separated in place: one step next to the other conventional activated sludge systems.
Separated in time: one step after the other fill-and-draw reactor & sequencing batch reactor (SBR) system.