Case Studies

Waste Water Treatment in a Milk Factory

Sri Lanka
Country:
Sri Lanka
Category:
Water Treatment
Tag:
Waste Water Treatment in a Milk Factory
Inlet
Inlet
In Cargills Quality Dairies(Pvt) Ltd., the second largest milk factory in Sri Lanka, they have great result with treating waste water from the factory, using EM.

The factory discharges 450,000L of waste water per day. At the inlet, Activated EM・1 is added every week to start treating the waste water.
The waste water is separated into fluid and solid matter (fat). The fat is transferred to a fat dome where they also throw EM in twice a week.
Fat Dome
Fat Dome
Before the introduction of EM, the fat dome could not process separated fat well. The water used to remain white even after going through the fat dome, and its odor was terrible. With EM application, the dome performs its role perfectly to treat the fat with fermentation and the processed water became gray, instead of white color. (*The color of the water is usually darker when the fat is processed well.)

 
 
The fat is fermented with EM in the dome and put back to anaerobic tanks. After going through 2 different anaerobic tanks, the water is transferred to aerobic tanks for the rest of treatment process.
As a result of the use of EM, the terrible odor is now gone. The final pond, filled with treated water used to be green with water-bloom, but it became clean and transparent. 
Supernatant
Supernatant
Pond
Pond
(Updated in 2016)