Dissolved Organic Carbon and Copper Speciation in Compost-Amended - - PowerPoint PPT Presentation

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dissolved organic carbon and copper speciation in compost
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Dissolved Organic Carbon and Copper Speciation in Compost-Amended - - PowerPoint PPT Presentation

Dec 15, 2022 30 likes •321 views

Dissolved Organic Carbon and Copper Speciation in Compost-Amended Bioretention Systems Markus Flury, Jessica Mullane, Maninder Chahal, Zhenqing Shi Department of Crop and Soil Sciences Washington State University Markus Flury (WSU) Leaching

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SLIDE 1

Dissolved Organic Carbon and Copper Speciation in Compost-Amended Bioretention Systems

Markus Flury, Jessica Mullane, Maninder Chahal, Zhenqing Shi

Department of Crop and Soil Sciences Washington State University

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 1 / 26

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SLIDE 2

Introduction

Outline

1

Introduction

2

Methods

3

Results

4

Conclusions

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 2 / 26

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SLIDE 3

Introduction

Bioretention Systems

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost What are the impacts of widespread use of compost in bioretention systems?

Source: LID Manual for Puget Sound, 2012

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 3 / 26

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SLIDE 4

Introduction

Bioretention Systems

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost What are the impacts of widespread use of compost in bioretention systems?

  • Dissolved organic carbon (DOC)
  • Copper (Cu)

Source: LID Manual for Puget Sound, 2012

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 4 / 26

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SLIDE 5

Methods

Outline

1

Introduction

2

Methods

3

Results

4

Conclusions

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SLIDE 6

Methods

Column Setup

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SLIDE 7

Methods

Compost

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SLIDE 8

Methods

Compost

Feedstock: Food waste: 1-20% Yard waste: 80-99% Age: 6 and 24 months

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SLIDE 9

Methods

Leachate

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SLIDE 10

Methods

Irrigation and Sample Analysis

Irrigation 6-months 24-hour storm 33 mm/day intermittend, every two weeks 18 storms Leachate Analysis pH, EC, DOC Nitrate, Nitrite, org. N Phosphorus, Cu (total and dissolved) Particulates < 0.45 µm 0.45 - 1 µm 1 - 11 µm > 11 µm

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 10 / 26

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SLIDE 11

Methods

Chemical Speciation Modeling

Model Visual MINTEQ Model Input Stormwater chemistry Leachate chemistry Model Output Cu species

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SLIDE 12

Results

Outline

1

Introduction

2

Methods

3

Results

4

Conclusions

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SLIDE 13

Results

Dissolved Organic Matter

1000 2000 3000 4000 5000 6000

DOC (mg/L)

200 400 600 800 1000 1200 Cumulative Leachate Flux (mm) 200 400 600 800 1000 1200

Replicate 1 Replicate 2 Replicate 3

1000 2000 3000 4000 5000 6000

EC (mmhos/cm)

1 2 3 4 5 6 7 Cumulative Leachate Flux (mm) 1 2 3 4 5 6 7

Replicate 1 Replicate 2 Replicate 3

Dissolved Organic Matter Electrical Conductivity

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 13 / 26

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SLIDE 14

Results

Copper

Storm Number Concentration (μg-Cu/L)

20 40 60 80 100 120 140 1 2 3 4 5 6 8 12 18

* * *

Copper

24 month 24 month 6 month 6 month

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SLIDE 15

Results

Copper

Storm Number Concentration (μg-Cu/L)

20 40 60 80 100 120 140 1 2 3 4 5 6 8 12 18

* * *

Copper

discharge limit for industrial activities

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SLIDE 16

Results

Surface Complexation

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SLIDE 17

Results

Surface Complexation

Metal ion (i.e., Cu) Sorbent functional group (i.e., DOC) Apparent equilibrium constant Activities Monodentate Complex Bidentate Complex

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 17 / 26

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SLIDE 18

Results

Surface Complexation

Metal ion (i.e., Cu) Sorbent functional group (i.e., DOC) Apparent equilibrium constant Activities Monodentate Complex Bidentate Complex

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SLIDE 19

Results

Copper Speciation

10 2 10 1 100 101 102 103

DOC (mg/L)

20 40 60 80 100

Species distribution (%)

Total inorganic Cu species Free Cu (Cu2+) Total organically complexed Cu Copper organic bidentate complex

pH = 7 [Cu_tot] = 28 µg/L

2+

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SLIDE 20

Results

Copper Speciation

10 2 10 1 100 101 102 103

DOC (mg/L)

20 40 60 80 100

Species distribution (%)

Total inorganic Cu species Free Cu (Cu2+) Total organically complexed Cu Copper organic bidentate complex

pH = 7 [Cu_tot] = 28 µg/L

Cu , CuOH , Cu(OH) , CuCO , CuCl

2+ 2+ + + 2 3

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SLIDE 21

Results

Copper Speciation

10 2 10 1 100 101 102 103

DOC (mg/L)

20 40 60 80 100

Species distribution (%)

Total inorganic Cu species Free Cu (Cu2+) Total organically complexed Cu Copper organic bidentate complex

E f f l u e n t D O C

6 7 8 20 40 60 80 100

pH

Total inorganic Cu species at 100 mg/L DOC Total organically complexed Cu species at 100 mg/L DOC Total toxic inorganic Cu species at 0.1 mg/L DOC CuCO3 (aq) at 0.1 mg/L DOC Total organically complexed Cu species at 0.1 mg/L DOC

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SLIDE 22

Results

Copper Speciation

10 2 10 1 100 101 102 103

DOC (mg/L)

20 40 60 80 100

Species distribution (%)

Total inorganic Cu species Free Cu (Cu2+) Total organically complexed Cu Copper organic bidentate complex

Effluent DOC

6 7 8 20 40 60 80 100

pH

Total inorganic Cu species at 100 mg/L DOC Total organically complexed Cu species at 100 mg/L DOC Total toxic inorganic Cu species at 0.1 mg/L DOC CuCO3 (aq) at 0.1 mg/L DOC Total organically complexed Cu species at 0.1 mg/L DOC

  • rganic

inorganic

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SLIDE 23

Results

Copper Speciation

10 2 10 1 100 101 102 103

DOC (mg/L)

20 40 60 80 100

Species distribution (%)

Total inorganic Cu species Free Cu (Cu2+) Total organically complexed Cu Copper organic bidentate complex

Effluent DOC

6 7 8 20 40 60 80 100

pH

Total inorganic Cu species at 100 mg/L DOC Total organically complexed Cu species at 100 mg/L DOC Total toxic inorganic Cu species at 0.1 mg/L DOC CuCO3 (aq) at 0.1 mg/L DOC Total organically complexed Cu species at 0.1 mg/L DOC

  • rganic
  • rganic

inorganic inorganic

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SLIDE 24

Results

Copper Speciation

6 8 10 12 14 16 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 Effluent [DOC]/[Cu] (g DOC/mmol Cu) pH 20 40 60 80 100 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 Effluent [DOC]/[Cu] (g DOC/mmol Cu) pH

pCu Cu-DOM (%) 100 10-1 101 102 103 100 10-1 101 102 103

[DOC]/[Cu] (g DOC/mmol Cu)

Activity of free Cu pCu = −log {Cu} Percentage of Cu complexed with DOC

10

Inflow Inflow Markus Flury (WSU) Leaching from Compost WSC 2019 Review 24 / 26

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SLIDE 25

Conclusions

Outline

1

Introduction

2

Methods

3

Results

4

Conclusions

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SLIDE 26

Conclusions

Conclusions

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost

EC, DOC, and particulates decreased over the course of an individual storm

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 26 / 26

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SLIDE 27

Conclusions

Conclusions

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost

EC, DOC, and particulates decreased over the course of an individual storm Each individual storm mobilizes constituents with increased concentrations

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 26 / 26

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SLIDE 28

Conclusions

Conclusions

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost

EC, DOC, and particulates decreased over the course of an individual storm Each individual storm mobilizes constituents with increased concentrations DOC from compost effectively complexes inorganic Cu

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 26 / 26

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SLIDE 29

Conclusions

Conclusions

filter strip water flow impervious surface retention zone native plants bioretention soil mix

compost

EC, DOC, and particulates decreased over the course of an individual storm Each individual storm mobilizes constituents with increased concentrations DOC from compost effectively complexes inorganic Cu Cu-DOC complexation is an equilibrium process

Markus Flury (WSU) Leaching from Compost WSC 2019 Review 26 / 26