LOW-LEVEL PHOSPHORUS: SIMPLE TECHNOLOGY FOR COMPLIANCE
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1 July 24, 2014 LOW-LEVEL PHOSPHORUS: SIMPLE TECHNOLOGY FOR COMPLIANCE MWOA Annual Meeting Author Leon Downing, PhD,PE Co-Authors Eric Lynne, PE Mike Gerbitz, PE
2 Phosphorus Limits
3 Phosphorus Regulations Number of states with nutrient criteria increasing Number of States with Nutrient Criteria * 2016* Year (* denotes projection)
4 Phosphorus Regulations 100% 90% 80% 70% % of Major Dischargers with P Limit 60% 50% 40% 30% 20% 10% 0% Top 10 States
5 Phosphorus Regulations 100% 90% 80% 70% % of Major Dischargers with P Limit 60% 50% 40% 30% 20% 10% 0% Minnesota: Ranks 6th Top 10 States
6 Phosphorus Regulations 100% 90% 80% 70% % of Major Dischargers with P Limit 60% 50% 40% 30% 20% 10% 0% Minnesota: Ranks 6th Wisconsin: beginning implementation of lowlevel phosphorus limits Top 10 States Wisconsin: mg/l
7 What is Low-Level P? Secondary Effluent Filtration Effluent Brookfield, Wisconsin Phosphorus (mg/l) /30/13 7/31/13 8/1/13 8/2/13 Blue dots: secondary treatment to <0.4 mg/l Red dots: <0.1 mg/l achievable with filtration
8 What is Low Level P? Secondary Effluent Filtration Effluent Brookfield, Wisconsin Phosphorus (mg/l) /30/13 7/31/13 8/1/13 8/2/13 Blue dots: secondary treatment to <0.4 mg/l Red dots: <0.1 mg/l achievable with filtration Low Level P definition: Requires filtration, <0.3 mg/l
9 Low-Level Phosphorus Treatment
10 Low P Treatment Soluble P Particulate P
11 Low P Treatment Soluble P Chemical and biological conversion Particulate P Soluble P Particulate P
12 Low P Treatment Soluble P Chemical and biological conversion Particulate P Soluble P Particulate P Particulate P
13 Low P Treatment Soluble P Chemical and biological conversion Particulate P Soluble P Particulate P Particulate P Physical Separation
14 Low P Treatment Soluble P Chemical and biological conversion Particulate P Soluble P Soluble P Particulate P Particulate P Particulate P Physical Separation
15 Low P Treatment Soluble P Chemical and biological conversion Particulate P Soluble P Soluble P Particulate P Particulate P Particulate P Physical Separation or Ballasted Sedimentation
16 The Type of P is Important
17 The Type of P is Important Removed by solids separation OK
18 The Type of P is Important Removed by solids separation Removed by solids separation OK
19 The Type of P is Important Removed by solids separation Removed by solids separation Available soluble P OK
20 The Type of P is Important Removed by solids separation Removed by solids separation Available soluble P Very difficult to remove Trouble
21 Technologies Lower than 0.1 mg/l technologies Ultra Filtration Membranes ACTIFLO - Kruger, Inc. Densadeg - Infilco Degremont, Inc. AquaDAF - Infilco Degremont, Inc. Blue PRO - Blue Water Technologies, Inc. CoMag - Cambridge Water Technology DynaSand D2 Dual Filtration System - Parkson
22 Late 2012/Early 2013: Disc Filtration Manufacturers Offered Low Cost Pilot Testing to Prove Technology
23 Step 1 Get Soluble P Into Particulate P That Can Be Separated
24 Step 1: P into Flocs
25 Secondary effluent Step 1: P into flocs
26 Step 1: P into flocs Secondary effluent After ferric and polymer addition
27 Step 2 Remove the Flocs
28 Disc Filtration
29 Disc Filtration Polymer Ferric or Alum Coagulation Flocculation Filtration
30 Clean, enclosed installation Disc Filtration
31 Disc Filtration Clean, enclosed installation Inside-out flow pattern
32 Disc Filtration Clean, enclosed installation Inside-out flow pattern Influent to center of filters
33 Disc Filtration Clean, enclosed installation Inside-out flow pattern Influent to center of filters Effluent surrounds discs
34 Disc Filtration Pilot Units Sun Prairie Brookfield Stevens Point HOV Beloit Brookfield Beloit Sheboygan
35 Disc Filtration Pilot Unit
36 Disk Filter Pilot Results Effluent TP (mg/l) < mg/l achieved High chemical demand Molar Ratio (Me:P)
37 Disc Filter Pilot Results % increase in chemical from 0.1 to mg/l Effluent TP (mg/l) Molar Ratio (Me:P)
38 Pilot Results Show Need to Do Best You Can in Upstream Processes Goal: TP to filters <0.6 mg/l
39 Low-Level P is Achievable, How Might it be Controlled?
40 Control
41 Ferric or Alum Control
42 Control Ferric or Alum Ferric or Alum Polymer
43 Control Orthophosphate Analyzer Ferric or Alum Ferric or Alum Polymer
44 Control Orthophosphate Analyzer?? Ferric or Alum Ferric or Alum Polymer
45 Online Analyzer Feedback Trim Allows Upstream Optimization Goal: TP to filters <0.6 mg/l
46 Effluent Limit May Provide Opportunity to Right-Size Equipment
47 Right Sizing RWW Flow (mgd) % 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percent Equal or Less Than
48 Right Sizing RWW Flow (mgd) Flows below 15 mgd 95% of the time 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Percent Equal or Less Than
49 Conservative Sizing
50 Right Sizing
51 Right Sizing
52 Takeaways
53 Takeaways Low P can be achieved (<0.1 mg/l)! Membrane not a necessity Cloth-media filtration and ballasted sedimentation Phosphorus speciation important Filtration pore size important Upstream treatment is critical High tertiary dosing rate (18 to 30 Me:P) Tight control on secondary treatment process May not need to meet low-level P limit at peak flows
54 Questions? Leon Downing, PhD, PE Donohue & Associates
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