Schwing Bioset, Inc Waste water Sedimentation inlet Pre treatment Primary Aeration Tank Secondary...

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Eric WanstromSchwing Bioset, Inc.

Schwing Bioset, Inc

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In partnership with:

Nutrient (struvite) Recovery

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Nutrient Recovery

________________________________ www.schwingbioset.com

Waste water inlet

Pre treatment

Primary Sedimentation

AerationTank

SecondarySedimentation

Post treatment

Sludge Thickener

Digester Biogas tank Cogen

Sludge Dewatering

Integrated Phosphate Management

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1. Phosphorus return load

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2. Pipe clogging / scaling issues

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3. Struvite grit accumulation

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4. Dewatering issues Bio-P

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5. Stabilizing Bio-P process

What are the Issues:

Case Specific Issues = Case Specific Approach

6. Increased sludge with iron salt

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Plant Issues: Mechanical:

Clogged pipes & damaged equipment Accumulations in tanks

Regulatory: Reduced Phosphorous effluent limits

Process: Poor dewatering characteristics resulting from biological

phosphourus removal process


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Nutrient Recovery

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Plant Opportunity: Struvite can be recovered by precipitating into prills High value fertilizer product with opportunity to market Improve dewaterbaility of biosolids Global steward of phosphate management


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Struvite recovery is a two stage process: Air Stripping Crystallization

Two stages allow for: Greater process control Stabilize operations by limiting variables to

control in each vessel Design flexibility to solve more/specific plant

issues Process can be applied to Digestate streams,

Filtrate streams or combination of both


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Features: Concentrations reduced to ~15 - 20 ppm PO4-P regardless of starting

concentrations on centrate applications Reduced to ~40 ppm on digestate applications


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Current Installations since 2006 5 Municipal installations (4 operating, 1 PO received) 5 Industrial installations

Municipal Installation List: Apeldoorn, Netherlands (Hybrid Solution) Aaenmaas Beijersbos, Belgium (Centrate Solution) Aquafin Aartselaar, Belgium (Digestate Solution) Nieuwegein, Netherlands (Digestate Solution) Braunschweig, Germany (Centrate Solution)


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Three primary configurations:1. Digestate

Improved dewatering due to residual MgEliminate scalingHarvest up to 50% of produced struviteTanks twice the size as operating on CentrateReduce PO4-P levels to 40-50 ppm regardless of starting concentration


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Three primary configurations:2. Centrate

Harvest up to 90% of produced struviteAir Stripper & Crystallizer tanks half the size as operating on digestateDoes not help with dewatering performanceDoes not help with scaling controlReduce PO4-P levels to 15-20 ppm regardless of starting concentration


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Three primary configurations:3. Hybrid

Harvest up to 90% of struvite produced in CrystallizerCrystallizer tank half the size as operating on digestatePrevents scalingDoes not help with dewatering performanceReduce PO4-P levels to 15-20 ppm regardless of starting concentration


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Air Stripper

Struvite recovery is a two stage process:

Stage 1: Stripping Reactor Blow air to remove CO2

Raises pH to 7.5 – 8.0 pH acts like an accelerator in a car

Higher pH = faster reactiono Smaller prills

Lower pH = slower reactiono Larger prills


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MgCl2

Crystallizer

Truck Load

Stage 2: Crystallization & Settling Reactor Magnesium Chloride is added (MgCl2) Mg reacts with P and N Pure struvite crystals are formed Crystals are recycled to grow like pearl Prills can be harvested and then:

Washed Optionally dried Bagged or truck loaded Settler


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ApeldoornHybrid

1. Digester

2. Equalization tank

3. Stripping reactor

4. Pumps

5. Blowers

6. Odor control (not necessary – can use plant odor control)

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Redundant pumps to transfer settled solids to dewatering. This struvite is not recovered and comes out of plant in dewatered biosolids


ApeldoornHybrid

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Redundant blowers to pump air through diffusers within stripping tank.

Air “strips off” the CO2 and results in a pH increase to 7.5 –8.0

In this pH range the magnesium that is present in the sludge will react and form struvite crystals


ApeldoornHybrid

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1. MgCl2 storage tank

2. Primary crystallization reactor

3. Settling tank

4. Buffer tank to ensure optimum flow to hydrocyclones (area #6) (only used when high recovery rates required)

5. Finished product truck loadout from area #6

6. Additional process equipment indoors


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ApeldoornHybrid


AaenmaasCentrate

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1. Air Stripper

2. Crystallization Reactors

3. MgCl2 tank

4. MgCl2 metering (wall mounted)

5. Blower

6. Product wash

7. Product loading


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AaenmaasCentrate

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1. Air Stripper2. Reaction Tank3. Settling Tank4. Agitator – no bearing in liquid 5. Hydrocyclone


AaenmaasCentrate

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View from below1. Air Stripper2. Reaction Tank3. Recycle


AaenmaasCentrate

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MgCl2 dosing system1. Mg tank2. Parallel metering


AaenmaasCentrate

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Blower for Air Stripper


AaenmaasCentrate


Finished productBottom of washerProcess pumps

AaenmaasCentrate


Finished product to storage Transport in

Classifying screw

Washing zone

AaenmaasCentrate

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Typical grit washer


AaenmaasCentrate

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Pilot Unit

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5 GPM digestate mode10 GPM Centrate modeCan harvest produced struviteCon operate in conjunction with screw press

Struvite Recovery

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Questions

Schwing Bioset, Inc Waste water Sedimentation inlet Pre treatment Primary Aeration Tank Secondary...

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