Given the variety of inhibitory compounds may enter accidentally in the treatment process of
wastewater treatment plant, in an exhaustive list is almost impossible .They can be characterized by their
purpose ( respirometric technique ) and not by their nature.
Respirometry seems to be a useful tool in monitoring and good start of treatment plants. Compared to
many other methods, it is relatively easy to implement and low cost, the data could be used for simple
characterization, control of the degradation process , to characterize more complex as the simulation and
design of a treatment plant wastewater.
This study has shown that no reduction in microbial activity was detected at different NaCl
concentrations: 1, 3, 4 and 5 g /l. using synthetic wastewater.
Because it difficult to compare removal efficiencies, and specific activities of microorganisms, this
study was complete with a microscopic examination, no dispersion or deflocculation of floc was
displayed and mobility of microorganisms are still good.