Thermal Process Systems - Justifying Class A EQ Biosolids Through...ATAD Biosolids = Product Not...
Transcript of Thermal Process Systems - Justifying Class A EQ Biosolids Through...ATAD Biosolids = Product Not...
-
Thermal Process Systems
Quality Biosolids Through Advanced Technologies
-
Class A – How to get there?
503 Regulations for Class A Biosolids lists
6 Alternative Processes.
#6 – PFRP – Process for Further Reduction
of Pathogens. This list includes ATAD –
time under temperature for Pathogen
Destruction.
-
ATAD
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
-
Digestion
Additional 10-15% solids destruction
in SNDR
-
End Product is KEY
WWTP’s Costs for Solids Disposal in the
Top 3 Budget Lines
ATAD Process
• Reduces Sludge Volume by 50%
• Produces a Product, Not a Waste. –
– Class A
– Odor-free
– Stable
-
Jet Aeration
• Varying Depths
• Continuous Operation
• Bottom of Tank Mixing
• Varying Liquid Flow
• Varying Air Flow
-
ThermAer Process Parameters “Mirror Image”
Independent research has proven that Oxygen Uptake Rate (OUR) and Oxidation
Reduction Potential (ORP) are inversely proportional, making this relationship a highly
reliable control variable.
-
SNDR
Storage
Nitrification
Denitrification
Reactor
Solids Conditioning
-
SNDR – solids conditioning
• Mesophilic Conditioning and pH Control
allow for Nitrification and De-nitrification in
a Single Tank
• Reduces Ammonia & Soluble COD
• Reduces Overall Dewatering Cost
– Valence electron ratio
• Cycle Blower On/Off to Control pH
• Satisfies any Residual Oxygen Demand
-
ATAD Process SAVES Money
– High Volume Reduction
• 55-70% VS Destruction - 50%+ TS Destruction
• 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
– Reduced Manpower
• High Degree of Automation Cuts Operator Time
– Energy Efficient – ORP Control Strategy
• System Matches O2 Delivery to Uptake Demand
-
Applications
• 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
-
ThermAer SAVES Money
– High Volume Reduction
• 55-70% VS Destruction - 50%+ TS Destruction
• 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
– Reduced Manpower
• High Degree of Automation Cuts Operator Time
– Energy Efficient – ORP Control Strategy
• System Matches O2 Delivery to Uptake Demand
-
ATAD Biosolids =
Product Not Waste • High Quality Organic Fertilizer – Class A
• Instant Product – NO Further Processing
– Meets Industry Specs for Compost
– Stable and Mature = Low Odor
– Flexible - Long Term Storage or Instant Use
• TPS Total N = 4.5% Compost Total N = 2.5%
-
2011 Corn Study
3 identical corn fields in Western
Minnesota
–ATAD Biosolids
–Commercial Fertilizer
–Cow Manure
103 day corn
-
Corn Study (cont)
Corn Field 1A
• 143.55 lbs/ac Biosolids N
Corn Field 1B
• 80 lbs/ac Fall Urea N
• 182.52 Solid Cow Manure Inc. N 262.52 Total
Corn Field 1C
• 80 lbs/ac Fall Urea N
• 60.84 lbs/ac Manure Surface Applied Winter
-
Corn Study (cont)
5.0 5.1 5.1 5.2 5.2 5.3 5.3 5.4 5.4 5.5 5.5
N (%)
1C-86
1C-421
1B-86
1B-421
1A-86
1A-421
-
Corn Study (cont)
Field Yield ATAD Biosolids 148 Bushels / Acre
Commercial Fertilizer 147 Bushels / Acre
Cow Manure 146 Bushels / Acre
-
Biosolids Conditioning
Can be applied to other digestive processes
- assists with dewatering
- controls ammonia recycle to the front of
the plant
- additional TS and VS destruction
-
SNDR following Anaerobic
• Exceptional ammonia nitrification and
denitrification
• Additional VS and TS destruction
• Elimination of odors created in the
anaerobic digestion process
• Conversion to an aerobic, more visually
appealing solid end-product
-
Speedway, IN
Average Results Since Start-Up
NH4 in
filtrate
Cake Solids VSR
14 mg/L 21% 31.2%
-
Speedway, IN
-
Marshall, MN
Middletown, OH
-
Yorkville, IL
-
Maryville, TN
-
Maryville, TN
-
Waseca, MN
-
Brunswick County WWTP
Brunswick County, NC.
Grand Chute, WI