A Study on Efficiency of Effective Microoraganisms of Waste Water Treatment

Abstract

The study on the two formula of effective microbial (EM) production was studied. EM Formula 1, the ingredients were 20 liters of water, 1 liter of molasses mixed with 1 liter of the concentrated effective microorganisms starter. Ingredients of EM formula 2 were 20 liters of water, 1 liter of molasses, 50 kilograms of chopped fruits and vegetables, 1 liter of effective microorganisms obtained from formula 1 and 5-10 milliliters of the concentrated effective microorganisms starter. The two EM Formula were used in a model for waste water treatment conducted in a laboratory. The result of the study and the statistic analysis showed that the efficiency between EM formula 1 and formula 2 for waste water treatment was not significance difference at level of 0.05.

From this study, the production cost of EM formula 2 was lower than EM formula 1. EM formula 2 was therefore used for waste water treatment in the real field work in some locations of water sources inside Rajamangala University of Thanyaburi (RMUTT). The result of this field experiment showed the decreases in the water chemical parameters especially the Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Ammonia – nitrate in all experimented water sources. Based on the quality of surface water determined by National Environmental Committee of Thailand 1994, the water quality in the experimented in RMUTT has been improved and location classified to be in category 3-4 after treated by EM formula 2.