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Soil Buffer Effects on Secondary Treated

Wastewater estimated Through Soil Column

Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

WORKSHOP:

Soil and Water

Bioremediation

Pisa 9-10th June 2016

Introduction – Framework

Reuse of treated wastewater (TWW) is nowadays

a relevant issue in EU in water management in

the framework of the circular economy concept

In this context are now under discussion

a new version of the draft Common

Implementation Stragey (CIS) guidance

document of the WFD on water reuse, and a

possible legislation setting minimum

requirements for:

These solutions are now known as water-related ecosystem services

such as phyto-treatment plants and SAT-MAR schemes

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

water reuse in

irrigation

groundwater

recharge

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Introduction

In phyto-treatment and SAT-MAR, several factors

influence the quality of water during the infiltration

Soil-Water-Plant Continuum

Inflow - TWW Outflow – water

for reuse/receptor

Objective

Evaluating the buffer capacity of bare

soils against potential pollutants in

secondary TWW in the provision of

Water Related Ecosystem Services.

In particular

The potentialities of two different

kind of soils are analyzed

through soil column tests

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Materials and Methods – Test Design

Continuos upward flow (6

months)

3 replicas per each soil

4 sampling points per column

Weekly sampled

Secondary TWW used as

infiltration source

Weekly sampled and

refreshed

26 samples per week:

• pH and EC

• Major ions

•Nitrate, Nitrite, Ammonium

•Phosphate

•Iron and Manganese

•Inorganic and NPO Carbon

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Materials and Methods – Column Design

-Main Structure Material PPMA

-Total Column Length 50 cm

- Internal Diameter 9 cm

- Soil Total Thickness 45 cm

(a) Water Observation Screen; (b) Quartz Fine Sand Filter; (c) Soil

Column Infos

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Materials and Methods – Final Setup

Sampling Port Column

Treated

Wastewater

Peristaltic

Pump

Inflow

Head Obs. Tubes

Outflow

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Materials and Methods – Soil Data

Water Content

[%]

C Org.

[%]

C Ino.

[%]

pH -H2O EC

[mS/cm]

Carbonates

[%]

Olsen-P

[mg/L]

M 48.6 47.9 15.9 4.31 1.21 n.d. 2.15

S 8.6 0.9 13.0 8.75 0.18 3.4 0.04

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Materials and Methods – Water Source

Soil Buffer Effects on Secondary Treated Waste

Water estimated Through Soil Column Experiments

1 2 3 4 5 6 7 80

0,5

1

1,5

2

2,5

3

3,5

4

4,5

0

0,05

0,1

0,15

0,2

0,25

0,3

N-NH4 N-NO2 N-NO3

N-N

O3

[mg/

L]

N-N

O2

& N

-NH

4 [m

g/L]

1 2 3 4 5 6 7 8

0,0

0,5

1,0

1,5

2,0

2,5

3,0

3,5

4,0

4,5

PO4

mg/

L

1 2 3 4 5 6 7 80

10

20

30

40

50

60

70

TIC NPOC

mg/L

1 3 4 5 6 7 8 9

Week

Water source

quality, NOT

constant during the

test

Column results

expressed as:

Δ = [Ci column point] – [Csource]

Days after infiltration

Data – pH

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Week

1 2 3 44,5

5,0

5,5

6,0

6,5

7,0

Sampling Port

pH

1 2 3 47,0

7,5

8,0

8,5

9,0

Sampling Port

pH

S.P. T S.P. T

Data – Ammonium

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

1 2 3 40

0,5

1

1,5

2

2,5

Sampling Port

Δ [

mg/L

*d]

1 2 3 4-0,05

-0,04

-0,03

-0,02

-0,01

0

0,01

0,02

0,03

0,04

Sampling Port

Δ [

mg/L

*d]

Week

S.P. T S.P. T

Data – Nitrate

1 2 3 4-4

-3,5

-3

-2,5

-2

-1,5

-1

-0,5

0

Sampling Port

Δ [

mg/L

*d]

1 2 3 4-3

-2,5

-2

-1,5

-1

-0,5

0

0,5

Sampling Port

Δ [

mg/L

*d]

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Week

S.P. T S.P. T

Data – Phosphate

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

1 2 3 4-1

-0,5

0

0,5

1

1,5

2

Sampling Port

Δ [

mg/L

*d]

1 2 3 4-0,7

-0,6

-0,5

-0,4

-0,3

-0,2

-0,1

0

Sampling Port

Δ [

mg/L

*d]

Week Week

S.P. T S.P. T

Data – Iron

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

1 2 3 40

1

2

3

4

5

6

7

Sampling Port

Δ [

mg/L

*d]

1 2 3 4-0,2

-0,15

-0,1

-0,05

0

0,05

0,1

0,15

0,2

Sampling Port

Δ [

mg/L

*d]

Week

S.P. T S.P. T

Data – Non Purgeable Organic Carbon

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

1 2 3 4-1

19

39

59

79

99

119

139

159

Sampling Port

Δ [

mg/L

*d]

1 2 3 4

-3,9

-3,4

-2,9

-2,4

-1,9

-1,4

-0,9

-0,4

0,1

Sampling Port

Δ [

mg/L

*d]

Week

S.P. T S.P. T

Changes along the column:

Conclusion - Recap

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

pH

Ammonium

Nitrate

Phosphate

Iron

NPOC

Conclusion

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

Although the chemical characteristics of soil represent only one over

the factors that play a role in the soil-water-plant continuum, they can

strongly influence many important compounds depending on:

pH

Presence of Organic Carbon

Particles filter effect

Conclusion – Future Activities

Soil Buffer Effects on Secondary Treated Wastewater

estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna

•Evaluate the buffer effect on some selected Pharmaceutical

compounds and Pesticides

• Evaluate the influences of the microbial activity on the

degradation of the organic compounds

Alessio Barbagli Scuola Superiore Sant’Anna

Land Lab – Institute of Life Sciences

Contact Infos:

E-mail: a.barbagli@sssup.it

Phone: +3905088356

Thanks for your attention

Soil Buffer Effects on Secondary Treated Waste

Water estimated Through Soil Column Experiments

Alessio Barbagli

Institute of Life Sciences – Scuola Superiore Sant’Anna