抄録
The authors made a non-steady state model of NH3 and CO2 gas balance in poultry house and performed simulation to show the effect of removal of manure on environment in poultry house. In this paper, “removal of manure”means to drop the manure on shelf to the 1st floor.
Figure 1 shows the assumed NH3 gas balance in the simulation model of the poultry house where the authors performed measurements in March of 1992. The results of the measurements were reported in the previous paper (Aono et al., Environment Control in Biology, 31 (1), 31-42, 1993) . In the measurements, the authors removed the accumulating manure on shelf on March 15. March 11 was before the removal of manure and March 22 was after the removal of manure.
The measured and calculated NH3 and CO2 gas concentration inside the poultry house before the removal of manure is shown in Fig. 2. The same after the removal of manure is shown in Fig. 3. Table 1 is the calculated terms in NH3 gas balance before and after the removal of manure, showing that NH3 gas generation from manure on shelf (NGM2) plays a major part to heighten NH3 gas concentration at the 2nd floor before removal of manure.
March 11 was the 72nd day after the previous removal of manure. NH3 gas concentration was calculated with relation of the days after removal of manure by means of estimating the surface area of accumulating manure. Figure 4 shows the calculated NH3 gas concentration at the 2nd floor, indicating that removal of manure is needed every one month in order to keep allowable concentration of NH3 gas (25 ppm) .
