With this question for wastewater treatment, i can't figure out what formulas to use!

calculate the pounds of solids under aeration of the given plant:

influent bod: 310 mg/l

influent tss: 210 mg/l

aerbay: 110' x 15' x 12 feet deep (operating level of the tank is 10')

aerbay mlss (mixed liquer suspended solids) 2,800 mg/l

effluent bod: 2.5 mg/l

effluent tss: 1.5 mg/l

2884.17 lbs

Explanation:

Data provided:

Influent BOD = 310 mg/l

Influent TSS = 210 mg/l

Dimensions of Aerbay = 110' × 15' × 12'

Operating level of the tank = 10'  

thus,

The operating volume of aerbay = 110 × 15 × 10 =  16500 ft³

also,

1 ft³ = 7.48052 gallons

Thus,

16500 ft³ = 16500 × 7.48052 gallons = 123428.58 gallons  

Now,

Aerbay MLSS (mixed liquor suspended solids) = 2,800 mg/l

Therefore,

Pounds of solids under aeration

= Operating volume of aerbay × concentration of aerbay MLSS

also,

1 mg/L = 8. 3454 × 10⁻⁶ lbs/gallon

thus,

Pounds of solids under aeration

= 123428.58 gallons × ( 2800 × 8. 3454 × 10⁻⁶ lbs/gallon )

or

= 2884.17 lbs

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.