# Hacktivateed

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## How do I calculate air blower capacity?

Airflow is rated in cubic feet per minute (CFM) or the metric equivalent, cubic meters per hour (M3/Hr). 1 CFM = 1.6990 x M3/Hr.

How do I calculate the volume of an aeration tank?

1. Example #2: For an assumed aeration tank MLSS of 2100 mg/L and.
2. Solution: The HRT and F:M ratio can be calculated using the last three.
3. VMG = V*7.48/1,000,000 = 170,275*7.48/1,000,000 = 1.27 MG.
4. HRT = 24*VMG/Qo = 24*1.27/3.5 = 8.7 hours.
5. F:M = (8.34*So*Qo)/(8.34*%Vol*X*VMG) = (175*3.5)/(0.75*2100*1.27)

### How do you calculate an aerator?

CALCULATE NUMBER OF AERATORS Number of aerators = Number of acres (rounded upward) Example: The lake is 220ft. wide x 370 ft. long (220′ x 370′ = 81,400 sq. ft = 1.87 acres (rounded up to 2 acres).

How is fan capacity calculated?

Calculating the size of fan needed Calculate the volume of the room in cubic meters by multiplying its length x width x height. Then multiply the room volume by the required number of air changes per hour, i.e. Example. Fan volume (m3/hr) = 10 x 8 x 3 x 10 = 2400m3/hr.

## What is the best CFM for a leaf blower?

Generally, electric leaf blowers have a CFM falling somewhere from just under 200 to 400. If your property is an acre or more, you will probably want a leaf blower with a CFM between 400 to 700. These machines are noisier and obviously more powerful with the ability to handle both wet and dry debris.

How is MLSS calculated?

MLSS consists mostly of microorganisms and non-biodegradable suspended matter. The total weight of MLSS within an aeration tank can be calculated by multiplying the concentration of MLSS (kg/m3) in the aeration tank by the tank volume (m3).

### What should be the MLSS in aeration tank?

The typical optimum MLVSS-to-MLSS ratio in activated sludge plants is between 0.7 and 0.8. Mixed Liquor Suspended Solids (MLSS) is the suspended solids in the mixed liquor of an aeration tank. Well designed and operated primary clarifiers should remove from 20 to 40 percent of BOD.

How much does core aeration cost?

The national average of aeration services is approximately \$125 for a midsize yard. However, you can find services for small yard for less than \$50, and aerator rentals for \$60 to \$75. Large yard spaces or yard with complex landscaping and sloping can average up to \$300.

## What is aeration rate?

Aeration rate is defined as the gas volumetric flow rate per unit volume of culture medium (vvm) .

How do I calculate flow rate?

Q=Vt Q = V t , where V is the volume and t is the elapsed time. The SI unit for flow rate is m3/s, but a number of other units for Q are in common use. For example, the heart of a resting adult pumps blood at a rate of 5.00 liters per minute (L/min).

### What is the minimum daily flow?

Since dry weather flow depends on the quantity of water used, and as there are fluctuations in rate of water consumption, there will be fluctuations in dry weather flow also. In general, it can be assumed that (i) Maximum daily flow = 2 x average daily flow and (ii) Minimum daily flow = 2/3 x (average daily flow).