W.C.Water-Winter

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Across
  1. 1. Pertaining to measurement by volume.
  2. 3. A chemical change resulting from biological action.
  3. 4. A process that produces contact between air and a liquid by spraying, bubbling air through the liquid or agitating the liquid surface.
  4. 5. The application of chlorine compounds to water or wastewater, generally for the purpose of disinfection, but frequently for chemical oxidation and odor control.
  5. 8. Liquid removed by a centrifuge.
  6. 10. Materials, generally organic that can be driven off from a sample by heating, typically to 550 deg C.
  7. 13. The condition of water, wastewater or soil that contains a sufficient amount of alkali substances to raise the pH above 7.0.
  8. 14. Engineering guidelines that typically specify the amount of influent flow that can be expected on a daily basis over the course of a year.
  9. 16. The study of the rates at which changes occur in chemical, physical, and biological treatment processes.
  10. 17. 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. 19. A substance that resists a change in pH.
  12. 20. A discrete clump of microorganisms on a surface as opposed to dispersed growth throughout a liquid culture medium.
Down
  1. 2. The determination, checking, or rectifying of the graduation of any instrument giving quantitative measurements.
  2. 6. Limestone that has been 'burned' and treated with water under controlled conditions until the calcium oxide portion has been converted to calcium hydroxide.
  3. 7. 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.
  4. 9. A collection of minute bubbles formed on the surface of a liquid by agitation, fermentation.
  5. 11. The liquor in which activated sludge or other matter is kept in suspension.
  6. 12. The reproducibility of a test or measurement.
  7. 15. The concentration of a test material that causes death of a specified percentage of a population, typically expressed as the median or 50% level.
  8. 18. Occurring during the day.