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Glenn AffleckCEng, MIChemE, Assoc. DBIADesign Manager
Upgrading Solids Dewatering at Rehoboth Beach WWTP
Background01Project Drivers02Project Scope03Dewatering Building04
Waste Sludge Holding Tanks05Construction Sequencing 06Next Steps07
Background
Plant Located in Sussex County, DESeasonal PopulationInfluent Flows
Criteria Winter SummerMax
Historical Month
Permitted
Influent Flow (MGD) 0.65 1.75 2.18 3.4
– Biosolids are aerobically digested and thickened to 1-1.5%– Land Applied for Disposal– Labor intensive and unreliable– County wide approach to management of biosolids– Regional Dryer system at Inland Bays Regional Wastewater Facility (IBRWF)
Project Drivers
– Phased CIP Upgrade currently ongoing at the plant– This project is Phase 3B of this upgrade and is the second to last phase of the
upgrade– Phase 3B Scope
• Demolish Gravity Thickener• Build new Biosolids Dewatering Building• Convert Aerobic Digesters to Waste Sludge Holding Tanks (WSHT)• Miscellaneous upgrades to other plant components as necessary to support these
new process areas
Project Scope
Project Scope – Existing Conditions
Sludge Thickener
Aerobic Digesters
Project Scope – After Dewatering Upgrade
New Dewatering Building
Waste Sludge Holding Tanks
Washwater Supply Pumps
Dewatering Building
Container Room
Blower Room
Sludge Pump Room
Electrical Room
Filter Press Room
Waste Sludge Holding Tanks
Demolish:‒ Catwalks‒ Agitators‒ Air piping
Air Diffuser System
Decant Pumps
– Project requires demolition of thickener– City needs to be able to dispose of sludge during operation– Unthickened sludge would require up to 9 trucks per day during an average summer
and up to 11 trucks per day on the average max historical month– Need to maintain some thickening capability during construction
Construction Sequencing
Title 2Example
T-6A
T-6B
T-7 B-3 Pumps
T-9CFrom PS-1
Truck Fill
B-3 Blowers
City Drains T-6A
T-6A
T-6B
From PS-1
T-7 B-3 Pumps
T-9CFrom PS-1
Truck Fill
B-3 Blowers
Convert to WSHT
Temp Suction Pipe
Construction Sequencing
Title 2
Construction Sequencing
T-6A
T-6B
From PS-1
T-7B-3
Pumps
T-9CFrom PS-1
Truck Fill
B-3 Blowers
Temp Suction Pipe
Temp Blower
Demo T-7
T-6A
T-6B
From PS-1
B-3 Pumps
T-9CFrom PS-1
Truck Fill
B-3 Blowers
Temp Suction Pipe
Temp Blower
B-7 Dewatering
Building
B-7 Blowers
Title 2Example
Construction Sequencing
T-6A
T-6B
From PS-1
T-9C
From PS-1
Truck Fill
B-7 Blowers
B-7 Dewatering Building
Cake
Convert to WSHT
B-3 Pumps
B-3 BlowersT-6A
T-6B
From PS-1
T-9CFrom PS-1
Truck Fill
B-7 Blowers
B-7 Dewatering Building
Cake
– Design is complete and awaiting bidding– Phase 2 to be completed prior to commencing Phase 3B construction– At this stage looking at commencing construction in Q2 2022
Next Steps
Thank You