Annual Conference Brochure - AZ Water Association

TECHNICAL SESSIONS
and installation of the new UV disinfection equipment in
the allotted timeframe a pre-selection process must be
implemented to ensure timely manufacturing of equipment.
3:00 - 3:30pm
Kinetics of Ciprofloxacin Degradation by Ozonation:
Effects of Natural Organic Matter, the Carbonate
System, and pH
Corin Marron, ARCADIS / Malcolm Pirnie, Inc.
The presence of pharmaceutical compounds in water
supplies is an environmental and public health concern.
Conventional drinking water treatment processes are
often ineffective for removing trace organic contaminants.
Advanced treatment processes, such as ozonation, have
demonstrated the ability to remove pharmaceutical
compounds from water supplies. During ozonation of
drinking water, the primary oxidants are ozone and hydroxyl
radicals, which form during ozone decomposition. Both
oxidants contribute to the transformation of pharmaceutical
compounds; however, the relative rates of transformation by
these oxidants depend on treatment operating conditions,
background water chemistry, and structure of the target
compound. This presentation discusses the relative impact
of natural water characteristics, such as natural organic
matter, the carbonate system, and pH, on the removal of
the fluoroquinolone antibiotic ciprofloxacin by ozonation.
TRACK 6 -
WASTEWATER TREATMENT
8:00 - 8:30am
Nitrification/Denitrification, Bio-P, and Recycle Rates
for these Systems
Roger Greaves, Burns & McDonnell
The presentation will focus on the IFAS process, major
equipment, technology advantages, process flow diagrams
and process control considerations.
8:30 - 9:00pm
Aeration System Upgrades at the
Chandler Ocotillo WRF
Lance Mason, Brown and Caldwell
During an upgrade to the aeration system at the Chandler
Ocotillo WRF, the fine-bubble diffusers were significantly
increased at the head of the aeration trains and the
aeration blowers were replaced with the new high-speed
direct drive units. With the high-speed unit installation came
many new considerations in terms of design, construction,
and start-up. These upgrades have proved to be most
beneficial in terms of energy efficiency but have also proved
valuable in reducing maintenance costs, noise, and initial
capital costs. The lessons learned during this installation of
new technology will be discussed in this presentation along
with the associated power efficiency improvements that
have been observed subsequent to the installation.
9:00 - 9:30am
Showcasing Energy Recovery Possibilities for WRFs
David Emon, City of El Mirage
This presentation is a brief showcase of energy recovery
technologies fit into a WRF. Many, many, gadgets,
technologies, and conceptual possibilities exist that could be
applied to a WRF. The presentation is intended to allow your
imagination to flourish and to share ideas, example: imagine
a wind turbine mounted on an odor control discharge running
every day, all day. What about thermal energy locked up in
effluent discharge being utilized to cool a nearby industrial
process, or ever thought about in-pipe turbine generators for
all of the water flowing down hill that is inherent to WRF?
Energy recovery is a green means to do the right thing.
9:30 - 10:00am
Buy One, Get One Free – One Design for Two MBR
Scalping Plants
Andrew Gilmore, Carollo Engineers
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The design team developed a one-plant design approach,
for two MBR WRPs that would minimize design and
construction costs, provide commonality in operations, and
meet more stringent future effluent quality requirements.
This presentation will focus on the main challenges,
approaches, and solutions of an innovative one-plant design
concept for two sub-regional MBR WRPs.
10:30 - 11:00am
Solar Membrane Distillation
Bryan Moravec, University of Arizona
We will discuss the development of a fresh water recovery
pervaporation reactor that is envisioned as the core unit in a
complete, ZLD, solar-driven, membrane distillation process.
In its current configuration, solar-heated, brackish water is
fed to the reactor on the outside of a hydrophobic, hollow
fiber membrane bundle, while air is passed through the
inside of the membrane fibers. Water evaporates through
air-filled membrane pores and is swept from the reactor via
the air stream. As the air cools, water vapor condenses and
is collected as pure product. Results show that permeate
fluxes from 1-6 L/m2∙d can be achieved with average
transmembrane temperature differences of 20-40˚C. Current
efforts focus on further improving permeation flux as a
function of transmembrane temperature difference and feed
solution salinity.
11:00 - 11:30am
Nanofiltration Softening – Soften Water with Effluent
Reuse in Mind
Joshua Brown, DSWA, A Jacobs Company
The Pinal County Justice Complex in Florence, AZ is
constructing a 150 gpm nanofiltration (NF) water
treatment system to provide softened water for its facilities
including the Superior Court, Sherriff’s Office, the 1200+
bed County Jail and Juvenile Detention Center. Softening
the water will protect valuable plumbing infrastructure,
most notably the thousands of solenoid valves used to
operate prison sinks, showers and toilets. The County opted
for an NF system in lieu of the typical ion exchange system
to avoid adding sodium to the wastewater stream. The
new system includes GAC for chlorine removal prior to NF
and calcium carbonate for post filtration pH control. This
presentation will discuss the basis for process selection and
describe the system design.
11:30 - 12:00pm
New Primary Solids Rotary Drum Thickener
Steven Puterbaugh, Brown and Caldwell
A new primary solids (PS) thickening process utilizing rotary
drum thickeners and a new rapid solids withdrawal pumping
system were installed at the Tolleson WWTP. Intent of the
upgrades was to reduce the volume of PS discharged to
anaerobic digesters and improve operation of the primary
sedimentation tanks (PST’s). Rapid solids withdrawal
reduced septicity in the PST’s, and benefited downstream
biological treatment at first and second stage trickling filters
that would otherwise have increased requirements to treat
additional BOD loadings resulting from solubilization of
PS. Anaerobic digestion also benefited by increasing the
mass of PS delivered. A secondary benefit was a noticeable
reduction in soluble sulfides discharged in the primary
effluent which normally volatilizes at the trickling filters and
contributes to hydrogen sulfide odor generation.
1:30 - 2:00pm
Focused Pulsed (FP) Treatment for Internal Utilization
of Waste Activated Sludge as an Electron Donor for
Denitrification or Enhanced Methane Production
Prathap Parameswaran, Arizona State University
Recent research from our group has elucidated the
significance of using Focused Pulsed (FP) (OpenCEL®) pretreatment
as a feasible technology for enhancing methane
production rates in anaerobic digesters and for utilizing
waste activated sludge (WAS) as an internal electron
donor to fuel denitrification. In FP treatment, the WAS is
subjected to high-voltage pulsed electric fields for a short
time, and the sludge flocs and cells are disrupted, making
them readily bioavailable for use as an electron donor. Here,
we evaluate using FP-treated WAS from the Irvine Ranch
Water District (IRWD). In particular, we evaluate methane
production through Biochemical Methane Potential (BMP)
tests and denitrification using batch denitrification rates
compared to a wide range of conventional electron donors,
such as methanol, ethanol, and glycerol.
2:00 - 2:30pm
Controlling Aeration With Ammonium Sensors
Bob Dabkowski, Hach, Inc.
The City of Peoria’s Beardsley Water Reclamation Facility
had a problem. The original ammonium sensors installed
with their aeration upgrade weren’t working and would
have to be sent back to Europe for repair. Also, running
the aeration system using only a DO setpoint was using an
excessive amount of power. An upgrade of the facility was
in the planning stages to ensure water quality standards
were being met. Instead, staff decided to give another
instrument manufacturer a try, replacing the original
ammonium sensor with the Hach NH4Dsc ammonium
probe. The NH4Dsc proved to be reliable, and allowed the
aeration system to be controlled correctly. That, along with
a few other improvements saved the facility $90,000 in
energy costs and $3,000,000 in capital improvements.
2:30 - 3:00am
Designing High-Speed Direct Drive Turbo Blower
Installations to Achieve a 20 Year Operating Life
Edmond Low, Brown and Caldwell
Recent experiences in the design, testing, installation and
start-up of high-speed direct-drive turbo blowers have
identified installation temperatures, factory test standards
and integrated control equipment as important design
considerations that could impact long term reliability.
Turbo blowers come prepackaged in sound enclosures with
onboard PLC’s, HMI’s and VFDs, and utilize permanent
magnet electric motors which make them susceptible to
high ambient temperatures. Current testing codes (PTC-10
and ISO 5389) fall short of providing rigorous criteria for
testing turbo blowers. Because of ultra high operating
speeds and the catastrophic effects of operating under
surge conditions, fully integrated local and master controls
equipment are essential. Turbo blower technology relies
heavily on instrumentation, power conditioning and
harmonic filtering equipment which have specialized
operational and maintenance requirements.
3:00 - 3:30pm
Using the Oxidation Index (OXI) as an Activated
Sludge Process Control Tool
Ronald G. Schuyler, Tetra Tech, EAS-IMR
A common activated sludge process control approach is
to adjust the amount of biomass according to the season
of the year. As temperatures depress from summer to
winter, process controllers usually try to increase mean cell
residence time (MCRT). The opposite occurs from winter
to summer. However, the nagging question is always How
much should I change the MCRT? The answer is related to
amount of Treatment Power (TP) required. The TP required
can be determined, compared to the TP provided (OXI) and
the process modified. The OXI depends upon the number
of microorganisms available, controlled by MCRT; the time
in which they have to act, controlled by return sludge flow
rate; and the temperature of the process related through
the factor ‐T-20.
TRACK 7 - COMMITTEE MEETINGS
Committee Meetings are TBA
8:00am – 3:30pm
AZ Water Association 84th Annual Conference & Exhibition Arizona’s Water Future is Here!