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Fernely Wastewater Facility

Final Design for CEE 457
by

Samantha McBride

on 29 September 2014

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Transcript of Fernely Wastewater Facility

East Fernely Wastewater Reclamation Facility
Peter Benchetler and Samantha McBride
Overview
Introduction
Unit Operations
Headworks
Grit Removal
Flow Equalization
Activated sludge/secondary clarification
Sludge Processing
Filtration
Disinfection
Plant Layout
Cost Analysis
CEE 457 Spring 2013
University of Nevada, Reno
Headworks
East Lift Station
Grit Removal
Flow Equalization
Activated Sludge
Secondary Clarifiers
Sludge Processing
Filtration
Disinfection
Cost Analysis
Plant Layout
Questions?
Introduction
Remove existing bypass channel, replace with similar channel for redundancy
Construct screening building
Remove existing aerated grit chamber
Expand Wet Well and Dry Well, add space for 4th Flygt 3500 gpm pump
Highway 50 Lift Station
Analyzed at 1 MGD (20% of design flow)
Existing Infrastructure is sufficient
MLE Process
Influent concentrations determined using ratio method
Based on target effluent: 1 mg/L NH4-N and 6 mg/L Total N
Analyzed at 12 and 25 C
East Lift Station
Screening
Wet Well / Dry Well
Construct building to prevent freezing
Odor control
Estimated screenings volume: 2.7-5 yards/ day
Anoxic Zone
3 selector zones
Flygt low speed mixers
Internal recycle using Flygt low head, high capacity pumps
Aerobic Zone
Ecologix disc diffusers (9.5" di.)
1,220 diffusers operating at 2 m^3/hr to supply 40.6 m^3/min
Tapered aeration pattern
Air supplied by Tuthill PD blowers
Activated sludge flows to solids wet well
RAS is constantly pumped at 1042 gpm (60% of Q) using recessed impeller centrifugal pumps (EGGER)
WAS pumped for 2 hrs/ day at 320 gpm using progressive cavity pumps (Seepex)
Ferric chloride can be added for H2S control
The wastewater facility at Fernley requires upgrades
Improve effluent quality
Prepare for future demands
Population and flow projections were performed based on data used for the recent water treatment facility
Design flow: 5 MGD for 2030
2.5 MGD for 2015
Extra room left for 7.5 MGD total
Rectangular grit channels
high area requirement
lower power than vortex
4 channels
Target velocity of 1 ft/s
Minimal flow area of each to achieve target
Conveyor system to remove grit
Design strategy
Minimize power costs and maximize available land
Design plant that can operate under variable flows
Use land contour and operation elevations for gravity flow
Mitigate variable flows throughout the day
Constant pump rate
2.5 MGD for 1 pump
5 MGD for 2 pumps
During low flows, pond empties
During high flows, pond fills up
Traditional dual media over upflow
reduce power costs
Anthracite and sand with similar bulk densities to avoid backwash stratification
Typical low-power sludge treatment train
Gravity thickening
Anaerobic digestion
Drying beds
RAS/WAS Pumping
Low rate digesters designed
to recover energy
Sludge drying beds recover
some water
lots of area
low maintenance
UV over chlorine
cost effective
No dechlorination
In-line blender for residual
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Full transcript