Case Studies

Odor Suppression Technology at Low-cost

Mato Grosso province, Brazil
Country:
Brazil
Category:
Water Treatment
Tag:
Governmental project, Mudball
Odor Suppression Technology at Low-cost

Sewage Treatment Plant

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 commercial and business field have been contibutated to progress of the city.

Due to the fast growing of the city, the company Águas de Primavera began operating a sewage system. At the begining, 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 operation system with the construction of new inlet and oulet 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 labor 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 regarding bad odors generated by the plant.
 
Mr. Marcio Akira, knowing the effects of EM Technology recommended to the technical group  of the plant to introduce EM Tecnnology to eliminate bad odors. Finally, after months of negotiation, EM•1® was applied in the plant.
                  
Because the problem was serious, municipality and environmental agencies were making  pressure to do somenthing to fight the odors. There was an official ceremony to launch the project in the plant with the participation of members of the local government, television and  newspapers.

Treatment Applying EM Technology
 
The use of EM • 1® to eliminate odors is simple and has quick results. However, to get completely success, it was necessary to follow a series of procedures that are outlined as follows:
 
 
Basic Information – Pond System
Treatment Time: 3 Months
Maintanaince Time: 9 Months
Scale: 38000 m2
Volume: 63000 m3
Capacity per Day 2500 m3 /day
Residence Time:: 25 days
Application of Activated EM1
Content Shock Treatment Stabilization (Oxidation) Treatment Monthly Maintanace
Activated EM1 1 L / 5 m3 1 L / 10 m3 /day 1 L / 50 m3  /day
Applications Only 1 3 monthes After 3 months
Application Site Apply directly and uniformely to the pond * Apply directly into the equalization tank or inlet of the first pond * Apply directly into the equalization tank or inlet of the first pond
Times Only 1 Daily Daily
Volumen per Aplication 12600 L 250 L / Day 50 L / Day
TOTAL VOLUMEN 12600 L 22500 L / 3 Months 13500 L / 9 Months
TOTAL OF ACTIVATED EM1 APPLIED   48600 L
 
NOTE 1: * Stabilization Treatment starts one day after the Shock Treatment. * Applications for stabilization and maintanance 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 begining 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 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 a new staff.
 
 
 
With the application of EM•1 is possible to treat the sludge and the material floating in a very low cost. To treat the sludge they used EM Mudballs pumping into the ponds in a dosis of 1 ball/5m2 once at the begining 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 spreaded into the ponds on quaterly basis until the material was completely eliminated.
After 15 days of EM•1 application, the bad odors were completed erradicated in the effluent treatment plant. Complains from residents reduced notably and a survey resulted on 90% of the residents noted positive changes with no bad odors anymore.
 
Photo 4: Tanks for making Activated EM・1®
Photo 4: Tanks for making Activated EM・1®
Photo 5: EM Mudballs made by the staff of the plant, Aguas de Primavera
Photo 5: EM Mudballs made by the staff of the plant, Aguas de Primavera
Photo 7: Applying Activated EM・1® into the ponds.
Photo 7: Applying Activated EM・1® into the ponds.
Photo 8: Application of EM Mudballs into the pond.
Photo 8: Application of EM Mudballs into the pond.
Photo 9: Local TV shooting the first applications of Activated EM•1® into the treament plant
Photo 9: Local TV shooting the first applications of Activated EM•1® into the treament plant