THE IMPACT OF METHODS USING MICROBIAL PREPARATIONS ON ODOR EMISSIONS IN LAYING HEN FARMING IN TRAN LAM WARD, HUNG YEN PROVINCE

Abstract

The study evaluated the deodorizing effectiveness of microbial biotechnology applied at chicken farms in Tran Lam ward, Hung Yen province. The research focused on two treatments using Emuniv microbial products: 1) a powdered formulation used solely for bio-bedding and solid waste treatment (GC1) and 2) a combination treatment where the powdered bio-bedding was enhanced with a liquid microbial spray (GC2). The results showed a clear odor reduction effect, especially the reduction of nuisance unpleasant odors in the barn. The results demonstrated a significant reduction in unpleasant odors, particularly inside the poultry barn. Emuniv microbial products were used either in powder form as biological bedding (GC1) and the combination of this powder microbial products with the Emuniv liquid formulation as a deodorizing spray (GC2). Both treatments effectively decreased the concentrations of odor-causing gases (NH₃, H₂S, VOCs) and CH₄ inside and outside the barn compared to before applying deodorizing measures. This reduction rate was greater than that of the control. The reduction rates of gases in the barn compared to before applying deodorizing were: 55.2 - 68.5% for NH₃; 66.3 - 75% for H₂S; 50.9 - 53.8% for CH₄ and 10.9 - 34.7% for VOCs. While this reduction rate in the control treatment reached the highest of only 11.4% for H₂S. Moreover, using Emuniv powder for bio-bedding and solid waste treatment reduced the investment cost of deodorizing materials per square meter of barn by approximately 20%. The combined application of Emuniv powder and liquid deodorizing spray (GC2) achieved enhanced deodorizing efficiency without increasing overall treatment costs compared to the control.