Is unpolluted rain naturally acidic?

Yes

No

It is not a good idea model a pollutant by using the Gaussian Plume model when;

The terrain is flat.

Using simple meteorology.

Modeling a point source.

The atmosphere carries the plume for a long distance.

Acid Rain has potential effects on aquatic life, damage to crops and forest. Dieback of trees is caused by;

Acid rain destroying the leaves on the trees so it is impossible for photosynthesis to take place.

Acid rain leaches the calcium and magnesium from the soil, lowering the molar ratio of calcium to aluminum, which in turn favors the uptake of alum by the fine roots.

Acid rain reacts with compounds in the soil creating acid isomers of nutrients which are absorbed by the roots of the trees.

If there is a baghouse particle collector already in place controlling air pollution from a chemical process with a efficiency of 95 percent. How many more collectors in series are needed to achieve 99.9999 percent efficiency?

2

5

4

1

Fixed Box Models are the simplest pollution concentration models for cities. They are easy to understand and use, but have drawbacks due to poor assumptions. Select the worst assumption.

The concentration of the upwind and downwind edges of the city are the same.

The wind velocity is constant and independent of time, location, and elevation.

emissions are uniformly distributed over the city.

Moderate rain will remove more pollution in the air through aqueous-phase reactions in one hour then dry deposition can remove over two to three days.

True

False

Gas and aqueous pathways depend on the production of oxidizing free radicals;

HO, CH3, O2

HO, O2, CH2

O2, CH3, HO2

By adding a catalyst to the destruction of VOC’s in a afterburner, the catalyst will;

Decrease the amount of VOC’s to be treated.

Allow the burning of the material below the lower explosive limit.

Allow the reaction to occur at a much lower temperature.

A high efficiency, dry collection of particles from hot gas streams by using an ion field to charge and collect particles is accomplished with;

Wet Scrubber

Baghouse

Electrostatic precipitation

Conversion rates of SO2 to SO4 are independent of PH and are very fast, however many times they are limited by the supply of;

OH

O3

HO2

If a fuel CxHy is burned in air with 45 percent excess air and a moisture of 0.0116mol/mol dry air, what is the equivalence ratio?

0.31

0.69

0.02

If the equivalence ratio is less than one;

All the fuel will be consumed.

There is not enough O2 for combustion of all the fuel.

Both, the fuel and the O2, will not be totally consumed.

When treating a gas stream for air pollution, why is it important to know the temperature of the exiting stack gas?

If the temperature is cool enough the moisture in the vapor can condense and cake the filter.

The temperature will effect the stack gas velocity.

Temperature is linearly related to the concentration of the pollutants.

Free radical attack initiated by sunlight, causing VOC’s to decompose by various pathways resulting in the production of the oxidizing free radicals HO (hydroxy), HO2 (hydroperoxy), RO (alkoxy), RO2 (Alkylperoxy), are most predominant;

At noon when the sun is highest n the sky.

During early morning sunrise.

At sunset.