BIOLOGICAL NUTRIENT REMOVAL PROCESSES
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1 BIOLOGICAL NUTRIENT REMOVAL PROCESSES Georgine Grissop PE, BCEE December 1, 2010
2 Milestones 1954 Wuhrman Proposes 2-stage, Aerobic/Anoxic Process 1957 Davidson Patent For A 2-stage, Anaerobic/Aerobic Process 1962 Ludzack And Ettinger Develop 2-stage Anoxic/Aerobic Process 1967 Phostrip tm, Sidestream Phosphorus Removal Process Proposed By Leven Et Al 1967 Excess Biological Phosphorus Removal Reported By Connell And Vacker At San Antonio, Texas, Rilling Plant 1968 Barth Proposes Multiple Sludge Processes For Nutrient Removal 1969 Scalf, Et. Al., Report On Excess Biological Phosphorus Removal At Baltimore, Maryland Back River Wastewater Treatment Plant
3 Milestones 1970 Savage Patents Denitrification Filter 1971 Excess Phosphorus Removal Reported At Los Angeles, California, Hyperion Plant By Bargman, Et Al 1973 Barnard Proposes Modified Ludzack-ettinger Process 1975 Barnard Patents Bardenpho tm Process 1976 Specter Patents A/O tm And A 2 /O tm Processes 1976 Bio-denitro tm Process Patented 1977 Jervis Develops Fluidized Bed Reactor For Denitrification 1980 University Of Cape Town Process Developed
4 Historical Context of Phosphorus Removal In 1960 s and 1970 s several plants reported removal of phosphorus above 80 percent What they had in common: Plug flow or compartmentalized aeration tank Inadequate aeration at head of aeration tank provided low D.O. High dissolved oxygen after low D.O. section Phosphorus release at head of tank Low SVI (less than 100 ml/gm) sludge (non-bulking)
5 Plug - Flow
6 A/O Process
7 Fermentation
8 Volatile Fatty Acid Induced Phosphorus Removal (VIPR)
9 PhoStrip Process
10 HISTORICAL CONTEXT OF NITROGEN REMOVAL
11 Attached Growth Nitrogen Removal
12 Ludzack-Ettinger Process
13 Modified Ludzack-Ettinger Process (MLE)
14 Bardenpho Process
15 Progression for Nitrogen Removal Only Ludzack-Ettinger Modified Ludzack Ettinger Bardenpho
16 Step-Feed Process
17 Bio-Denitro System
18 COMBINING NITROGEN AND PHOSPHORUS REMOVAL
19 The A 2 O Process Combines A/O and MLE Processes A/O A 2 / O ML E
20 Modified Bardenpho Process
21 Progression of BNR Options
22 A 2 O to UCT A 2 O UCT
23 From UCT to VIP UCT VIP
24 UCT and Modified UCT UCT Modified UCT
25 Step BioP Process
26 N & P Removal in Oxidation Ditch Waste
27 BNR Process Performance Process Nitrogen Removal Phosphorus Removal MLE Good (7-9 TN) None Step Feed DN Good (7-9 TN) None AO None Moderate (< 2 TP) A 2 O Good (7-9 TN) Good (< 1 TP) Step Feed DN & bio P Good (7-9 TN) Good (< 1 TP) UCT & VIP Good (7-9 TN) Good (< 1 TP) 4 Stage Bardenpho Excellent (3 6 TN) None 5 Stage Bardenpho Excellent (3 6 TN) Good (< 1 TP) Denitrification Filter w/c feed Excellent (3 4 TN) None Chemical Addition None Excellent (< 0.5 TP) Advanced Processes Excellent (1 TN) Excellent (< 0.1 TP)
28 BNR Process Enhancements Enhancement Nitrogen Removal Phosphorous Removal IFAS MBR Reduces needed volume w/o increasing clarifier load Reduces needed volume, no sec clarifiers required None Enhanced P solids removal Media Filters None Enhanced P Solids removal Cloth Filters None Enhanced P solids removal Ballasted Clarification None Enhanced P solids removal
29 What is IFAS? AS + TF(RBC) = IFAS NOT! Integrated Fixed Film Activated Sludge
30 The Advantages. Higher capacity in same volume Increased biomass w/o increased clarifier loading Re-seeding of suspended phase Self correcting IFAS RAS WAS
31 Wastewater Treatment Traditional vs Membrane Bioreactor (MBR) Aeration Secondary Clarifier Sand Filter TRADITIONAL Return Activated Sludge Waste Activated Sludge Raw Sewage MLSS Recycle Permeate Pump MEMBRANE BIOREACTOR WAS Process Air Air Scour
32 Denite Filters Removes biosolids (contain N & P) Removes P solids Denitrification mode Add carbon source Methanol Acetate Nitrate to Nitrogen gas
33 QUESTIONS?
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