W.C.Water-Winter
Across
- 1. A collection of minute bubbles formed on the surface of a liquid by agitation, fermentation.
- 5. A chemical change resulting from biological action.
- 8. Engineering guidelines that typically specify the amount of influent flow that can be expected on a daily basis over the course of a year.
- 10. The dynamic response of a system to the addition or deletion of a substance until equilibrium is reached; adjustment to the change in the environment, typically used to describe the response of microorganisms to a change in environment.
- 14. Limestone that has been 'burned' and treated with water under controlled conditions until the calcium oxide portion has been converted to calcium hydroxide.
- 16. Pertaining to measurement by volume.
- 18. A discrete clump of microorganisms on a surface as opposed to dispersed growth throughout a liquid culture medium.
- 19. The concentration of a test material that causes death of a specified percentage of a population, typically expressed as the median or 50% level.
- 20. The study of the rates at which changes occur in chemical, physical, and biological treatment processes.
Down
- 2. A process that produces contact between air and a liquid by spraying, bubbling air through the liquid or agitating the liquid surface.
- 3. The determination, checking, or rectifying of the graduation of any instrument giving quantitative measurements.
- 4. The condition of water, wastewater or soil that contains a sufficient amount of alkali substances to raise the pH above 7.0.
- 6. A substance that resists a change in pH.
- 7. Materials, generally organic that can be driven off from a sample by heating, typically to 550 deg C.
- 9. Finely divided solids (smaller than 0.002 mm and larger than 0.000001mm) that will not settle but may be removed by coagulation, biochemical action or membrane filtration; they are intermediate between true solutions and suspensions.
- 11. The reproducibility of a test or measurement.
- 12. The application of chlorine compounds to water or wastewater, generally for the purpose of disinfection, but frequently for chemical oxidation and odor control.
- 13. The liquor in which activated sludge or other matter is kept in suspension.
- 15. Occurring during the day.
- 17. Liquid removed by a centrifuge.