This week's quiz involves a treatment process for washing soil and treating the wash water. You'll need to read two documents. First, a description of the the BioTrol process. BioTrol . Second, a process where the BioTrol was used treat wash water from soil at a wood treating site. Biological Treatment. You only need to read Appendix A, pages 17 to 19 . Of the two documents, the first is more of a schematic, while the second has details. The quiz will work from the schematic, except that the interior of the reactor is not shown, and for that we will work with details from the second document.

Question 1 One characteristic of the microorganisms that reside on the fixed film, about which we can be fairly certain - they are

a. anaerobic

b. aerobic

c. cryophilic

d. acidophils.

2. The influent wash water from the soil [prior to the addition of a caustic base] must be

a. acid, because a caustic(base) is added to bring the pH to just above 7.

b. alkaline, because a caustic (base) is added to bring the pH to just above 7.

c. neutral, because a caustic (base) is added to bring the pH to just above 7.

d. Need to know the BOD to determine this.

3. What nutrients are added?

a. Lime and calcium

b. magnesium and iron

c. nitrogen and phosphorus containing compounds

d. Not given

4. The process required extensive filtration to remove suspended solids? T/F

5. Why was air pumped into the system?

a. To cool the mixture

b.To maintain the dissolved oxygen at 5 ppm

c. Air was added by natural convection, not pumping

d. Not given

6. If you used the BioTrol to treat soil washing water, and the soil was a mixture of sand and clay, what physical process are might be used to remove sand before the water is treated.

a. clarification, filtering, centrifuges.

b. charcoal filtration, screening, clarification.

c. evaporation/distillation, flotation, filtering, centrifuges.

d. screening, clarification,charcoal filtration, flotation.

7. If you used the BioTrol to treat soil washing water, and the soil was a mixture of sand and clay, what physical process are might be used to remove clay (a colloid) before the water is treated.

a. screening, clarification, filtering, centrifuges.

b. charcoal filtration, screening, clarification.

c. filtering, possibly centrifuges or flotation.

d. screening, clarification,charcoal filtration .

8. What might you do to extend the range of options to remove the clay?

a. Coagulation/Flocculation

b. Add acid

c. Add base

d. Extraction.

9. If the wash water contained hydrophobic, volatile contaminants, which process might clean the water effectively

a. Addition of acid or base

b. Change the pH and precipitate

c. Air stripping

d. Leaching

10. PCP is an organic compound that contains chlorine. Therefore a waste containing PCP should not be

a. taken to a RCRA TSDF

b. used for backfill, even after the PCP is removed

c. incinerated in a MSW incinerator

d. handled, except by Teflon coated backhoes.