Thermal Process Systems Humbert - Three Rivers.pdf · Thermal Process Systems Quality Biosolids...
Transcript of Thermal Process Systems Humbert - Three Rivers.pdf · Thermal Process Systems Quality Biosolids...
Thermal Process Systems
Quality Biosolids Through Advanced Technologies
Three Rivers, Michigan
Three River Fun Fact Population – approximately 12,000
and
Neal Ball, baseball player, was the first player in MLB history to pull off an
unassisted triple play. He played for Three Rivers's semiprofessional
team in 1901.
First Municipal ThermAer
Installation
Agenda
Definitions
Process
Challenges
Benefits
Things to Consider
Definitions
ATAD
HRT / SRT
Sludge
Biosolids
Class A Biosolids
ATAD for CLASS A
A = Autothermal
T = Thermophilic
A = Aerobic
D = Digestion
Autothermal
Self-heating – No external heat source
needed
Thickened material feed to the reactor
Thermophilic
Aerobic
Conditions in the reactor are kept
aerobic
Anaerobic conditions can produce
mercaptans and other odorous
compounds
Oxygen Supply
Back then
Now
Digestion
ATAD
10,000 pounds 5,000 pounds
Dewatering SNDR
Beneficial Reuse
3,800 pounds
HRT / SRT
HRT – Hydraulic Retention
Time
SRT – Solids Retention
Time
Sludge – Solids influent of a
wastewater treatment plant
Biosolids – treated sludge
Class A Biosolids
Pathogen Requirement
Vector Attraction Reduction
Use 38% or higher volitale solids
destruction - alternative
Process Flow
Three Rivers Process
ATAD 1
ATAD 2 Dewatering
Influent feed of:
Primary
WAS Secondary
Septage
Thickening
Cooling
Holding Tank
MORE
COOLING
Either Centrifuge or
Fournier Press
23 to 28 % solids
Jet Aeration
Challenges
Temperature – Thermophilic
temperatures require fuel =
thickening of VS.
Foam – Some is good, but it can
quickly get out of hand.
Odor – BiofiltAer on site
Foam Control
• Integrated System
• Enhances O2 Transfer
• Allows CO2 and
Ammonia Stripping
• Ease of maintenance
– no moving parts
Controlling Foam is Essential to Reactor Health
Foam Control
BiofiltAer™
• Low Operating Costs
• Minimal Head Loss
• Inorganic Layer for
Longer Media Life
• Organic Media for
Biological Culture
• Can treat up to 300
ppm NH4+
Morehead WWTP
Morehead, KY
Benefits – Influent flexibility
• Thickened Feed Solids > 3%
– Lower HRT / Smaller footprint
• Waste Activated Sludge (WAS)
• Primary Sludge
• Septage
• Dissolved Air Flotation (DAF)
• Any Biological Degradable High COD Material
• SBR
• MBR
Benefits - ThermAer SAVES $$
High Volume Reduction
• 55-70% VS Destruction - 50%+ TS Destruction
• Trickle down effect – post digestion equipment
• Cut Hauling and End Use/Disposal Costs by 50%
Improves Dewatering – even on WAS
• Higher % Solids = Less Material to Manage
• Solids Range 25 - 33%
• Reduced Polymer Demand
Benefits - ThermAer SAVES $$
Reduced Manpower
• High Degree of Automation Cuts Operator Time
Energy Efficient – ORP Control Strategy
• System Matches O2 Delivery to Uptake Demand
Things to Consider
Grit removal
60 cubic yards in 2 years ago
160 cubic yards after first 10 years
Foam control – mechanical and operational
- Foam cones added
- Operational changes
- Strategy changes…….
Things to Consider
Use existing equipment
Increase capacity without adding tankage
ODOR CONTROL
Bigger is Better
Industrial influent
Dairy waste
Three Rivers, MI
Marshall, MN
Middletown, OH
Maryville, TN
Marshall, MN
Marshall, MN
Douglas County, WA