Integrated Activated Sludge and Biosolids Treatment to Conserve Energy & Waste Solids Disposal
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1 Integrated Activated Sludge and Biosolids Treatment to Conserve Energy & Waste Solids Disposal Nathan Antonneau, P.E.
2 Presentation Outline Typical Flowsheet Configurations Process Reconfiguration - ISBR (to save $$) ISBR Process History ISBR Process Fundamentals Expected Performance Case Studies
3 Continuous Activated Sludge Treatment Influent Aeration Basin Secondary Clarifier Effluent RAS Digested Sludge (to dewatering and disposal) Aerobic Digester WAS RAS - Return Activated Sludge WAS - Waste Activated Sludge
4 Batch Activated Sludge Treatment Influent SBR Basin Effluent Digested Sludge (to dewatering and disposal) Aerobic Digester WAS RAS - Return Activated Sludge WAS - Waste Activated Sludge
5 The Sequencing Batch Reactor Fill React Settle Decant Idle Time
6 Areas for Cost Savings? All processes produce waste solids, they may need: Stabilization (aeration) Conditioning (chemical treatment) Processing (thickening & dewatering) Hauling & disposal Our goal is to produce less waste solids, thus save $$
7 The Cannibal Process (Continuous) Influent Aeration Basin Secondary Clarifier Effluent Periodic Purge RAS Solids Separation Module Interchange Digested Activated Sludge Sludge (to dewatering and disposal) Aerobic Bioreactor Digestor WAS IAS Trash Dumpster
8 The Cannibal Process (Batch) - ISBR Influent SBR Basin Effluent Periodic Purge RAS Solids Separation Module Interchange Digested Activated Sludge Sludge (to dewatering and disposal) Aerobic Bioreactor Digestor WAS IAS Trash Dumpster
9
10 ISBR Process Flowsheet
11 SBR / Cannibal History Sequence Batch Reactors Used for more than 30 years Thousands of installations 70% Municipal, 30% Commercial/Industrial Marketed by many manufacturers Cannibal Marketing began in Cannibal projects sold to date 10 in long term operation >95% municipal sewage Marketed exclusively by Siemens
12 Elements of the Cannibal Process 1. Solids Separation Module 2. Side-Stream Bioreactor (Cannibal Tanks) 3. SmartCannibal Control System
13 Fine Screen and Hydrocyclones
14 Solids Separation Module Screen Material
15 Screen Discharge
16 Hydrocyclone Separation of Inerts
17 Why the Solids Separation Module? BIOMASS (active biosolids) Trash Fine Inerts Non-biodegradable solids in feed
18 Interchange Bioreactor
19 Interchange Bioreactor Heart of the Cannibal Process Limited aeration Non-aerobic environment stresses and conditions aerobic bacteria - breaks down cells, increases biodegradability Non-aerobic environment selects for low-growth facultative bacteria Interchanged back into main treatment process into nonaerobic zone
20 Smart Cannibal Control System Automated system for ease of monitoring and control ORP and ph probes control the environment in the Bioreactor Suspended solids sensors and level sensors monitor mass flow rates
21 Case Study - Morongo Design Flow Design BOD Design TSS Aeration Tank Volume 0.75 MGD 900 mg/l 350 mg/l 2.4 MG total Current Operating Parameters Flow.0.40 mgd BOD mg/l TSS..300 mg/l Aeration tank BOD load...6 lbs/day/1000 ft 3 (aerobic) MLSS mg/l Trash Yield...~0.15 lb TSS/lb BOD Biological Solids Yield <0.15 lb TSS/lb BOD
22 Morongo Yield Performance Chart
23 Morongo Purged Biosolids
24 Case Study Allen County Solids produced vs BOD treated 500, ,000 y = x R 2 = Cumulative inventory + waste solids 300, , ,000 y = 0.229x R 2 = C annibal Process Operating at R educed Rate y = x R 2 = y = 0.49x R 2 = y = 0.378x R 2 = Cannibal Process Not Operating 0 Cannibal Process Not Operating y = x R 2 = y = x R 2 = , , ,000 1,200,000 1,500,000 Cumulative lbs BOD
25 Typical Cost Savings Approximate savings: Stabilization (aeration) >80% Conditioning (chemical treatment) 50 to 70% Processing (thickening & dewatering) 50 to 70% Hauling & disposal 50 to 70%
26 Questions
27 Contact Information Nathan Antonneau, P.E
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Dave Diehl Applied Technologies, Inc.
Dave Diehl Applied Technologies, Inc. Overview Wisconsin phosphorus regulatory update Big Bend Facilities Plan Phosphorus removal alternatives and evaluation Alternative recommendation Phosphorus Rules
Dave Diehl Applied Technologies, Inc.
Dave Diehl Applied Technologies, Inc. Overview Wisconsin phosphorus regulatory update Big Bend Facilities Plan Phosphorus removal alternatives and evaluation Alternative recommendation Phosphorus Rules