Amid the Brazilian midwestern plains, is “Primavera do Leste”, a city located 237 km from Cuiaba, capital of Mato Grosso province. This is a city developed mainly in agriculture and commerce fields and is one of the cities that stand out in the growth of population (approximately 60,000 in just over 22 years after established as a city). Privileged by its location, as well as strength in the commercial and business field has been contributed to the progress of the city.
Due to the fast-growing of the city, the company Águas de Primavera began operating a sewage system. In the beginning, the effluent treatment system was inefficient because it had a low rate of households coverage; only 1280 households had access to the sewage network. Today, the system has 63,059 meters of collector network and improved the operating system with the construction of a new inlet and outlet for the effluent from the anaerobic pond. Finally, the collection network increased to more than 2845 homes.
The effluent treatment plant uses stabilization ponds, which are one of the most efficient when there are space and time available. Further, no skilled labour is needed to operate this system.
The system consists of:
One separation unit waste and effluent; One sand decantation unit;
One measurement unit; One anaerobic pond; One facultative pond; Three maturation ponds;
As the population increased and the city expanded, upper-class residents who moved nearby the treatment plant, started complaining about bad odours generated by the plant.
Mr Marcio Akira, knowing the effects of EM Technology recommended to the technical group of the plant to introduce EM Technology to eliminate bad odours. Finally, after months of negotiation, EM•1® was applied to the plant.
Because the problem was serious, municipality and environmental agencies were making pressure to do something to fight the odours. There was an official ceremony to launch the project in the plant with the participation of members of the local government, television and newspapers.