Small Scale Swine Farm Wastewater Treatment using Effective Microorganism (EM)

Abstract

The objective of this research was to examine the efficiency of the effective microorganism (EM) to
treat a small scale swine farm wastewater. The effective ratio of EM: wastewater and the effective retention
time as also examined. The wastewater in this study was collected from small scale swine farm in Amphoe
Muang, Lopburi Province. Grab sampling method was used and the wastewater was collected at sump of
the farm. Five parameters were examined: pH, Biochemical Oxygen Demand (BOD), Chemical Oxygen
Demand (COD), Suspended solid (SS), and Total Kjedahl Nitrogen (TKN). Mean, standard deviation,
Relative Standard Deviation (RSD), One-way ANOVA, and Kruskal-Wallis ANOVA were used in this study.
The results showed there were significant differences in five parameters and control group when
treated by EM: wastewater ratio (1: 1,000 1: 2,000 1: 3,000 1:4,000 and 1: 5,000) (p<0.05). The BOD of
wastewater at 1:1,000 ratio showed the most significantly different between control group and treatment
(p=0.004). The COD of wastewater at 1:1,000 ratio showed the most significantly different between control
group and treatment (p=0.004). Moreover, the comparison of mean differences of pH, BOD, COD, SS, and
TKN between control group and treatment by EM in 2 days, 4 days, 6 days, 8 days, and 10 days showed
that 10 day - treated wastewater had significantly different at 0.05 level. The SS of 6 day-treated
wastewater had the most significantly different between control group and treatment. Whereas, the BOD,
COD, and TKN of 10 day-treated wastewater had high percentage of reduction.