This simply means that we induce airflow through the mix of materials using an electric blower and Flow meter to be provided to find out air low and percentage of Oxygen may be analyses by lab.it is calculated by dividing the measured airflow rate (units: L/m, using a rotameter) by the volume (L) of growth medium (including cultured cells). The process required 30 days to finish without turning, with 10 metric tons of compost (10 piles) obtained each time. A 15-inch squirrel-cage blower was used to force the air through 10 static piles of compost, one at a time, for 15 minute periods twice a day.

The air flow rate in aerated static composting can be theoretically calculated based on the oxygen demand of the composting process1. The aeration rates needed for composting are determined by converting oxygen demands to aeration demands, then by considering the duration over which aeration is needed1. This establishes the average rate of aeration. Aeration rates are usually expressed in cubic feet of air per hour per dry ton (cfh/dt) of mix1.

Practically, in a laboratory setting for 4-5 kg of dry mass in small containers, you would need to measure the actual air flow rate using an airflow meter or anemometer. The air flow rate can be adjusted by controlling the fan speed or the opening of the air inlet.

Please note that the actual air flow rate may need to be adjusted based on the characteristics of the composting material and the environmental conditions1. For example, if the composting material is very dense or wet, it may require a higher air flow rate to ensure adequate oxygen supply1.

Remember, these calculations are theoretical and actual results may vary due to real-world factors such as the specific characteristics of the composting material and environmental conditions1.