Odor Suppression Technology at Low-cost

Odor Suppression Technology at Low-cost

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.

Location: Brazil


The use of EM • 1® to eliminate odours is simple and has quick results. However, to get complete success, it was necessary to follow a series of procedures that are outlined as follows: NOTE 1: * Stabilization Treatment starts one day after the Shock Treatment. * Applications for stabilization and maintenance can be done on the preliminary treatment or the lifting station or the inlet of the first pond. The results are better when the EM•1 applications are applied at the beginning of the system. NOTE 2: At this phase, it would be possible to apply the preventive treatment for sedimentation and floating material. MATERIALS AND MANPOWER ▪ – 1 Box of water or a similar plastic tank with a lid for 5000L capacity, would be used for activation of EM•1 for application of 30 days. ▪ – Manpower for applications and preparation: 6 hours / Staff / Month. It is not necessary to recruit new staff.


With the application of EM•1 is possible to treat the sludge and the material floating at a very low cost. To treat the sludge they used EM Mudballs pumping into the ponds in a dose of 1 ball/5m2 once at the beginning and then one application every 6 months to eliminate the sediments. Therefore, 8000 mudballs were applied into all ponds and to treat the floating material they used EM Bokashi (wheat bran fermented with Activated EM•1). The EM Bokashi was spread into the ponds on a quarterly basis until the material was completely eliminated. After 15 days of EM•1 application, the bad odours were completed eradicated in the effluent treatment plant. Complains from residents reduced notably and a survey resulted in 90% of the residents noted positive changes with no bad odours anymore.