Page 63 - Fundamentals of Water Treatment Unit Processes : Physical, Chemical, and Biological

18 Fundamentals of Water Treatment Unit Processes: Physical, Chemical, and Biological

Describe how you would respond with respect to treat- Concerning the boxes, the author requested permission
ment technologies. from the late Dr. Harvey Ludwig (1916–2010) to use his
1.17 Site Visit to WTP biography and photograph, and to provide corrections regard-
Visit a WTP, and based upon your visit, comment on ing accuracy. Dr. Ludwig commented (October, 2009) that the
any aspect of the plant that you found of interest. This summary of ES was accurate, subject to a few minor correc-
could be related to operation, design, the selection of tions. The biography was done, however, by the author alone
unit processes for the treatment train, the appearance of based on a long-time personal knowledge going back, in fact,
the influent water, the appearance of the product water, to 1957 and on Dr. Ludwig’s autobiography (Ludwig, 1985).
the particular characteristics of any unit process, the
control system, the monitoring, the requirements for GLOSSARY
product water, etc.
1.18 Site Visit to WWTP Active process: A process that is controlled by actions of the
Visit a WWTP, and based upon your visit, comment on operator.
any aspect of the plant that you found of interest. This Box (n.): A short, often boxed auxiliary story that is printed
could be related to operation, design, the selection of alongside a longer article and that typically presents
unit processes for the treatment train, the appearance of additional, contrasting, or supplemental views.
the influent water, the appearance of the product water, Constant: A ratio of two or more variables that is char-
the particular characteristics of any unit process, the acteristic of a group of materials or a system.
control system, the monitoring, the requirements for Examples of the former include the universal gas
product water, etc. constant for gases, and the modulus of elasticity for
solid materials. Often, a coefficient is called a con-
stant.
ACKNOWLEDGMENTS
Discipline: A family-like grouping of individuals sharing
The Denver Water Department, Denver, Colorado, is known intellectual ancestry and united at any given time
commonly as Denver Water, which is the citation used in this by an interest in common or overlapping problems,
text. William C. Lauer, American Water Works Association, techniques, and institutions . . . Some are happy fam-
formerly manager, Denver Potable Water Reuse Plant, filled ilies, with little controversy over methods and goals.
in knowledge about the plant, its evolution, and its design. Others are fractured into many research schools,
Trina McGuire-Collier, manager of Community Relations, each with a different agenda, each evolving its own
Denver Water, facilitated permissions to use brochure mater- traditions of thought and work, and each competing
ial, i.e., Figures 1.5, from the Denver Potable Water Reuse for resources and recognition . . . . Disciplines not
Demonstration Plant. only lend structure and meaning to lives, they also
John Rawlings, Miller-Coors Brewing Company, Golden, bring order and significance to knowledge. (Excerpts
Colorado reviewed the section on the Coors WWTP and from the Preface of Servos, 1990.)
provided corrections and Figure 1.6. The author is responsible Engineered process: A unit process that has been designed
for the use of the material and its accuracy. by an engineer (as opposed to a natural process).
Sylvie Roy, communications and marketing manager, Natural process: An influence within the ambient environ-
Infilco Degremont, Richmond, Virginia, gave permission to ment that causes changes in water quality. Examples
use the ABW filter images of Figure 1.3. She also provided include dilution due to mixing of streams, dispersion
additional images to use as needed. within a stream, heat transfer involving ambient
Regarding Colorado Springs, Jim Phillips and later water, microbiological reactions within an ambient
Daryl Gruenwald hosted many class field trips to the water body, etc.
plant during the 1970s and provided brochures and plant Passive process: A process that occurs largely without oper-
descriptions from that period that were utilized in this ator intervention. Slow sand filtration or trickling
chapter. Since the 1970s, the main plant has been filter treatment are examples. All natural unit pro-
expanded and the tertiary plant has been modified to elim- cesses are passive.
inate the lime clarification and GAC adsorption, with new Process: An influence that causes change, i.e., a ‘‘state’’
rapid filters constructed; the 1970s plant was used, how- change. As applied to water quality, a process causes
ever, for the examples in this chapter since it illustrated the change in one or more water-quality characteristics.
points useful for this introductory chapter. Tony Woodrum Science: Systematized knowledge obtained from observation,
and Pat McGlothlin in a May 2001 tour of the facility study, and experiment in order to determine the
provided an update of the changes that had occurred nature of that studied. George A. Olah, 1994 Chem-
since the 1970s. Woodrum, Wastewater Operations Super- istry Nobelist at ACS Symposium as reported in
intendent, gave permission (2010) to utilized photographs Chemical & Engineering News, Vol. 76(35):6, 31
of the 1970s plant. August 1998.