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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: [email protected]
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