Soil biological filter deodorization device for livestock and

In order to find out an efficient way for removing odour gas form livestock and poultry farms, a soil biological filter deodorization device was studied. This article described an overview of soil biological filter deodorization device performance index, structure and working principle. The structure parameters and operating parameters of main components were determined. The gas distribution pipes were used in the matrix layer to improve the removal effect. The active soil filtering bed ingredients were grassmould 75%, perlite 20% and black carbon 5%. The height of filter bed was 1 000 mm, surface load of filter material was 15.5-22.0 m3/(m2·h), and the range of filter humidity was controlled at 52%±3%. Prototype application results showed that removal rate of main odour material NH3, CH4 and CO2 were above 95%; CO and nitrogen oxides (expressed in NO2) were above 85%. The removal rates for volatile organic matter and diffusion odour of livestock and poultry, IP-Inhalable particle (PM10) and total suspended solids (TSP) were all above 95%. The odour concentration of vented gas from the system was 7.5-8, which can meet the discharge standards requirements.