Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
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