galena wastewater treatment upgrades informational presentation for the sassafras river association...
TRANSCRIPT
GALENA WASTEWATER TREATMENT UPGRADES
Informational Presentation for the Sassafras River Association
Presented by Ryan J. Rangel, PE
April 23, 2015
Presentation Outline
1. Overall Project Timeline – (Already Partially Discussed by Mr. Felty)
2. Need for the Project3. Initial Treatment Technologies
Considered4. MDE Becomes a Stakeholder5. Final Treatment and Equipment
Examples6. Expected Benefit of New WWTP7. Questions
Timeline Since McCrone’s Involvement (2012)
June/July 2012 McCrone completes PER/ER for a County sewer system and upgrades to Town WWTP.
December 2012 – Design contract signed and McCrone begins work.
February 2013 – McCrone completes schematic design for 130,000 GPD
April 2013 – Meet with MDE for SD review. MDE offers BRF money.
June 2013 – MDE Planning allows for 110,000 GPD of capacity at new plant. Same time frame, proposed equip. is confirmed to meet BNR limits.
Timeline Since McCrone’s Involvement (2012) - Continued
Late June 2013 – MDE requires denite filter replace cloth filter.
Late August 2013 – McCrone submit revision to Schematic Design Report to address lower flow and how filter can be incorporated into design.
Late February 2014 – MDE provides official comments to August submittal.
May 2014 – McCrone submits additional information to MDE to address comments and add grit removal to the design.
June 2014 – Full design continues after comment from MDE.
Timeline Since McCrone’s Involvement (2012) - Continued
October 2014 – 90% Submittal of Construction Documents made to MDE
December 2014 – MDE Comments on 90% Submittal
March 2015 – 100% Submittal of construction documents made to MDE.
April 2015 – Awaiting MDE comments. Should be shortly.
Late May 2015 – Go to BidEarly October 2015 – Award contract and start
construction.Early 2017 – Complete 15 month construction.
Need for the ProjectExisting WWTP
Need for the ProjectExisting WWTP
Need for the ProjectExisting WWTP - Auto-Enhanced Picture
Need for the Project
Existing WWTP has trouble meeting current limits for Total Suspended Solids and Ammonia
Current discharge limits at 60,000 GPD◦30 mg/L BOD monthly avg. - 5,475 lbs/year
◦90 mg/L TSS monthly avg – 16,425 lbs/year
◦2.5 mg/L – 5.5 mg/L NH3 – No real TN Limit
◦10.7 mg/L Total Phos. – 2605 lbs/year
Need for the Project
Town is under a consent order to design and construct a new facility.
County has areas with failing septic systems that they wanted to address in the Georgetown area. Looked at other service areas while considering Georgetown.
No current County wastewater collection system exists.
Georgetown Collection Area
Lee Avenue Collection Area
Maplewood Lane Collection Area
Olivet Hill Collection Area
Proposed County Collection System Areas
Existing WWTP
Original Treatment Objectives
Avg. Flow Rate (GPD)
BOD5 (mg/L)
TSS (mg/L)
Total Phosphorus (lbs/year)
Total Nitrogen (mg/L) pH
Min. DO (mg/L)
Max. E.Coli (MPN/100
mL)
130,000 5 50.65 based on an annual cap
of 256 lbs
3.88 based on an annual
cap of 1538 lbs
6.5- 8.5 5.0 126
Treatment Technologies AnalyzedSequencing Batch Reactor (SBR)Oxidation DitchMembrane Bio Reactor (MBR)Did not review fourth (Moving
Bed Bio Reactor - MBBR) because of lack of time from vendor
Treatment Technologies Analyzed
Treatment Basics
Treatment Technologies – Project Costs
Project costs for all technologies were within the level of accuracy for a typical study (10%).
McCrone developed a set of subjective factors to evaluate the alternatives from a non-monetary perspective.
The SBR is recommended based on essentially an equivalent cost and higher score on subjective factors.
Influent Screen
Raw Wastewater
Pump Statio
n
Valve Vault
SBR Basins
Post Eq Basin
Tertiary Filtration
UV Disinfectio
n
Post Aeration
Plant Drain (All Structures and Buildings)
Surface Discharge
Wasted SolidsAerobic Digester
Dewatering
Equipment
Solids to Landfill
AirChemicalAddition
Air
Air
Existing Lagoon Used as
Emergency Overflow from
All Process Structures
To Influent Screen
Overflow Return from Ex. Lagoon
Legend
Gravity Flow
Pressure Flow
Air Line
Air
Non-Potable Water
System
Process and
Maintenance Uses
Original Treatment Schematic
MDE Becomes a Stakeholder
At schematic design review meeting with MDE, Bay Restoration Fund (BRF) money was offered if Town decreased limits to ENR levels.
ENR Levels = 3.0 mg/L Total Nitrogen and 0.3 mg/L Total Phosphorus
MDE also required additional treatment processes including grit removal and denitrification filter.
Influent Screen and Grit Removal
Raw Wastewater
Pump Statio
n
Valve Vault
SBR Basins
Post Eq Basin
Denite Filter
UV Disinfectio
n
Post Aeration
Plant Drain (All Structures and Buildings)
Surface Discharge
Wasted SolidsAerobic Digester
Dewatering
Equipment
Solids to Landfill
AirChemicalAddition
Air
Air
Existing Lagoon Used as
Emergency Overflow from
All Process Structures
To Influent Screen
Overflow Return from Ex. Lagoon
Legend
Gravity Flow
Pressure Flow
Air Line
Air
Non-Potable Water
System
Process and Maintenance
Uses
Revised Treatment Schematic
Chemical Addition
ChemicalAddition
Overflows From SBR, Post Eq and Digester
Examples of Pieces of EquipmentInfluent Screen - ¼” self cleaning screen
to remove inorganics and protect equipment and downstream processes.
Examples of Pieces of EquipmentGrit Removal – Remove non-organics from
waste stream. Protects downstream components. Saves space in process tanks.
Examples of Pieces of EquipmentGrit Classifier – Rinse organic matter
from grit and concentrate grit from grit slurry.
Examples of Pieces of EquipmentInfluent Pump Station – Pump up
onsite flows to the SBR process.
Examples of Pieces of EquipmentSequencing Batch Reactor – Main biological
process to remove BOD and nutrients. One basin performs several operations.
Examples of Pieces of EquipmentSequencing Batch Reactor – Main biological
process to remove BOD and nutrients. One basin performs several operations.
Examples of Pieces of EquipmentSequencing Batch Reactor – Main
biological process to remove BOD and nutrients.
Examples of Pieces of EquipmentDenitrification Filter – Sand filter that
helps to polish off nitrogen and suspended solids.
Examples of Pieces of Equipment
Denitrification Filter – Installation in Washington County. Similar unit as Galena’s.
Examples of Pieces of EquipmentUV Disinfection – Use ultraviolent light to
destroy or keep bacteria from regrowing.
Examples of Pieces of EquipmentUV Disinfection – 254 nm wavelength.
Install at Worton WWTP.
Examples of Pieces of EquipmentDewatering Unit – Press water from
solids for lower hauling costs.
Impact of Upgrades
Avg. Daily Flow (GPD)
BOD Limit (mg/L)
Yearly BOD
(lbs/year)
TSS Limit (mg/L)
Yearly TSS.
(lbs/year)
Total Nitrogen (mg/L)
Total Nitrogen
(lbs/year)
Total Phosphorus
(mg/L)
Total Phosphorus (lbs/year)
Present 60,000 30 5475 90 16425NH3 Limit
328710.7*** 1948
Projected* 110,000 10 3349 10 3349 3.0 1339 0.3 101Projected Net Reduction -2126 -13076 -1948 -1847
Questions