What is the estimated biosolids pumping rate for the following wastewater system?

Assume sludge = 8.34 lb/gal

Plant flow = 1.27 mgd

Removed biosolids = 1.08%

Influent total suspended sollids (TSS) = 317 mg/L

Effluent TSS = 105 mg/L

A wastewater treatment pond receives a flow of 243,000 gpd. What is the organic loading rate in pounds of BOD per day per acre (lb BOD/d/acre), if the pond has a surface area of 4.12 acre-ft and the influent BOD concentration is 216 mg/L?

Calculate the influent flow to a trickling filter in mgd, if the BOD loading is 1,470 lb/d and the BOD is 212 mg/L.

What is the soluble BOD if the total BOD is 209 mg/L, the K factor is 0,58, and the suspended solids (SS) are 198 mg/L?

Given the following data, calculate the mean cell residence time (MCRT) for this activated sludge system.

Aeration tank and final clarifier volume = 0.677 mil gal

Mixed liquor suspended solids (MLSS) = 3,580 mg/L

Suspended solids (SS) wasted = 1,910 lb/day

Secondary effluent SS = 368 lb/day

What is the food-to-microorganism (F/M) ratio for an aeration tank with a volume of 419,500 gallons, if the primary effluent flow is 5.77 mgd, the MLVSS is 3,095 mg/L, and the BOD is 238 mg/L?

Given the following data, determine the seed sludge required in gallons.

Digester has a radius of 24.8 ft.

Liquid level in digester is 16.5 ft.

Requires 15.0 % seed sludge

What is the solids loading for a dissolved air flotation (DAF) unit in lb/hr/ft2 that is 59.4 ft. by 18.0 ft., with a sludge flow of 0.201 mgd and a WAS concentration of 7,830 mg/L, and the sludge weighs 8.71 lb/gal?

Calculate the unseeded BOD in mg/L, given the following data:

Start of test bottle DO = 9.3 mg/L

Bottle was incubated for 5 days in the dark at 20 degrees C.

After 5 days DO = 3.8 mg/L

Sample size = 100 mL

Total volume = 300 mL

A soda ash is conical at the bottom and cylindrical at the top. If the diameter of the cylinder is 17.5 ft, with a depth of 34.5 ft, and the cone depth is 14.0 ft, what is the volume of the tank?

What is the solids loading rate for a secondary clarifier, given the following information?

Radius of clarifier = 65.4 ft

Primary effluent flow = 3,779,000 gpd

Return sludge flow = 725,000 gpd

MLSS = 2,110 mg/L

Determine the WAS pumping rate in gpm, given the following data:

Amount of WAS to be wasted = 4,380 lb/day

WAS suspended solids concentration = 3,170 mg/L

What is the organic loading rate in lb BOD/d/1,000 ft3 for a trickling filter that is 68.5 ft in diameter and 5.05 ft. deep, if the primary effluent flow is 2.46 mgd and the BOD is 149 mg/L?

Given the following data, calculate the cost of running a pump in dollars and cents per day.

Flow = 1.58 mgd

TDH = 167 ft.

Motor efficiency = 89,9%

Pump efficiency = 71.4%

Cost in kilowatt hours = $0.076

What is the pressure 5.25 ft. from the bottom of a tank at exactly 48 hr after the pumping started, given the following data?

Tank radius = 35.5 ft.

Initial sludge depth = 3.42 ft.

Sludge flow into tank = 72.5 gpm

What is the organic loading rate in lb BOD/d/1,000ft3 for a trickling filter that is 151 ft. in diameter and 5.10 ft. deep, if the primary effluent flow is 1,220 gpm and the BOD is 207 mg/L?

What is the air-to-solids ratio for a dissolved air flotation (DAF) unit that has an air flow rate equal to 9.10 ft3/min, a solids concentration of 0.76%, and a flow of 0.185 mgd? Know: Air = 0.0807 lb/ft3 at standard temperature, pressure, and average composition.

How many lb/hr of air does a DAF unit receive, if the unit receives air at an average rate of 0.259 m3/min? Know: Air = 0.0807 lb/ft3 at standard temperature, pressure, and average composition and there are 35.3 ft3/m3.