The calculation of gas volume in microporous aeration tubes involves multiple parameters and steps. The following is a detailed calculation method:
1、 Determine basic parameters
1. Sewage flow rate: Firstly, it is necessary to determine the sewage flow rate of the sewage treatment facility, usually measured in cubic meters per hour (m3/h).
2. Aeration tank area: Understand the area of the aeration tank in order to calculate the required aeration rate per square meter in the future.
3. Design gas-liquid ratio: Determine the appropriate gas-liquid ratio based on the requirements of the treatment process, which is the ratio of the volume of gas entering the microporous aeration tube per unit time to the volume of liquid.
2、 Calculate the total aeration rate
1. Based on the sewage flow rate and the designed gas-liquid ratio, the total required aeration rate can be calculated. The formula is as follows:
2. Total aeration rate (Q)=sewage flow rate x gas-liquid ratio
3、 Determine the parameters of microporous aeration tubes
1. Ventilation rate: Understand the ventilation rate of the selected microporous aeration tube, which is the amount of gas that each tube can provide per hour.
2. Aeration intensity: Determine the required aeration intensity per square meter of aeration tank area as needed, that is, the amount of gas required per square meter per hour.
4、 Calculate the required number of exposed tubes
1. According to the ventilation volume calculation:
2. The ventilation time of a single aeration tube (t)=1/aeration tube ventilation volume
3. The required number of aeration tubes per square meter (N)=total aeration volume/(aeration tank area x ventilation volume of a single aeration tube)
4. According to the aeration intensity calculation:
5. If the required aeration intensity per square meter is known, the total ventilation volume of the required aeration tubes can be directly calculated, and then divided by the ventilation volume of each aeration tube to obtain the required number of aeration tubes.
5、 Consider other factors
In practical applications, the following factors also need to be considered:
1. Arrangement of aeration tubes: The arrangement of aeration tubes in the aeration tank will affect the distribution and mixing effect of gases.
2. The material and service life of aeration tubes: Different materials of aeration tubes have different corrosion resistance and service life, which need to be selected according to the actual situation.
3. Maintenance and cleaning of the aeration system: Regular cleaning and maintenance of the aeration system can ensure its normal operation and extend its service life.
6、 Example calculation
Assuming the sewage flow rate of a certain sewage treatment facility is 100m3/h, the designed gas-liquid ratio is 15:1, the aeration tank area is 50m2, and the ventilation rate of the selected microporous aeration tube is 0.5m3/h. Then:
1. Total aeration rate=100m3/h × 15=1500m3/h
2. Ventilation time of a single aeration tube=1/0.5m3/h=2 hours
3. The required number of aeration tubes per square meter is 1500m3/h/(50m2 × 0.5m3/h)=6 tubes/m2
Note: This is just a simple example calculation, and in practical applications, more factors may need to be considered, such as the length of the exposure tube, pore size, pore density, and working pressure.
In summary, the calculation of gas volume in microporous aeration tubes is a complex process that requires comprehensive consideration and calculation based on specific circumstances.
