ECOLOGY AND THE ROLE OF MICROORGANIS: A WORK SYSTEM TO OPTIMISE THE SMALL WASTEWATER TREATMENT PLANTS.

Alternative wastewater treatment systems (stabilization ponds, percolating filters, …) are inexpensive methods for small cities.

Control and prediction of wastewater treatment plants takes an important goal to avoid breaking the enviromental balance by always keeping the system in stable operation conditions.

The quality of information is known through a microscopic examination. However, some of these examinations are not easy to analyse and process, and staff with high information about organisms is needed because of the high variety of organisms: microorganisms (bacteria, fungi, algae and protozoa) a large macroinvertebrate animals populations (insects, arachnids, rotifers, etc.).

It is possible to make different analyses such as to count the organisms which appear in the biological treatment, to control the biocenosis (filamentous bacteria, protozoa and metazoan populations, …) and the water saprobic gradient on each system.

The relative abundance of a particular organism in a habitat often indicates its importance within the ecological structure of that treatment system. This information could be an important controlling factor if a specialist controls a few small wastewater treatment plants, because as a consequence, costs are reduced.

The use of organisms (bacteria, protozoa, metazoan, …) as indicators of effluent quality is a practical system of control.

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