INTRODUCTION TO ALGARVE DEMO SITE, MARSOL PROJECT

PT participants:

Teresa E. Leitão, J.P. Lobo Ferreira, Manuel M. Oliveira, Tiago Martins, Maria José Henriques, Ana Estela Barbosa (LNEC)

Tiago Carvalho, José Martins de Carvalho, Rui Agostinho, Rita Carvalho (TARH)

José Paulo Monteiro, Luís R.D. Costa, Rui Hugman (UAlg)

With the support of: APA Algarve and AdA - Águas do Algarve

Water Quality Workshop, June 24th-26th 2015, Algarve

Introduction to Algarve DEMO site, MARSOL project

� PT1 Algarve, rio Seco

(Campina de Faro

aquifer)

� PT2 Algarve, rib.

Meirinho (Querença-

Silves aquifer)

� PT3 Alentejo, Melides

(lagoon)

Introduction to Algarve DEMO site, MARSOL project

MAR to improve Water Quality

� High nitrate concentrations in the upper aquifer systems caused by agricultural practices� Campina de Faro aquifer system is part of a declared Nitrate Vulnerability Zone by the

applications of the Nitrates Directive (since 1997, enlargement in 2004)

PT1 Algarve, rio Seco (Campina de Faro aquifer)

Portaria n.º 1100/2004(IDRHA)

Nitrate vulnerability zone of Campina de Faro

Introduction to Algarve DEMO site, MARSOL project

PT1 Algarve, rio Seco

(Campina de Faro aquifer)

The aim is to demonstrate that the groundwater qualitycan be improved applying MAR through infiltration basins constructed in the rio Seco river bed as well aslarge wells

The following infrastructures were used during 2014/15:

� the basins constructed during GABARDINE 6FP EU project (PT1_1) were rehabilitated for MARSol

� a new large MARSol basin (PT1_2) was constructed and tested

� large-diameter wells (PT1_3) were tested for infiltration

Introduction to Algarve DEMO site, MARSOL project

PT1_1 Algarve, rio Seco

• Rehabilitation of the existing structures (2 basins, 1 spillway, 1 well and 2 piezometers, leveling of rio Secobed, leveling GABARDINE basins (May/June 2014)

• Hydraulic tests and well log sampling collection to measure clogging (June 2014)

SOUTH NORTH

2.5 m 2.5 m 2.5 m

p1 p2

∇∇∇∇∇∇∇∇

5

7.5

Infiltration pond 1 Infiltration pond 220 m 20 m

15 m5 m5 m15 m5 m

Design of two infiltration ponds in River Seco bed (Carreiros test site) - vertical section

vertical scale (m)

2.5

5.0

7.5

10.0

12.5

15.0

17.5

20.0

Keeping 20 cm level above the basin: a 4.29 m3/h infiltration was attained, representing an average

infiltration rate of 1.03 m/d

Introduction to Algarve DEMO site, MARSOL project

PT1_2 Algarve, rio Seco

• Built new long basin until reaching the n.p., up gradient the existing ones, plus piezometers and a spillway (July/Aug 2014)

• Infiltration test (Set/Out 2014) (18 m3/h)• Tracer test with NaCl (Out 2014)• Continuous monitoring of natural infiltration (on-going)

Introduction to Algarve DEMO site, MARSOL project

PT1_3 Algarve, large-diameter wells: • Infiltration test, 3 flowrates (Sept 2014)

Infiltration capacity > 34 m3/h!

Introduction to Algarve DEMO site, MARSOL project

April 2008May 2014

May 2015

Introduction to Algarve DEMO site, MARSOL project

PT2 Algarve, Rib. Meirinho

(Querença-Silves aquifer)

The aim is to contribute to the development of SAT system to treat WWTP, and to increase groundwater storage and quality

The following infrastructures will be used:

SAT basins will be used to reduce the treated effluents of a WWTP (PT2_4), which discharges water into Ribeiro Meirinho river (PT2_5) -> WP14 soil-column tests

In Cerro do Bardo (PT2_6), a tributary of Ribeiro Meirinho, the available small dam infiltration structure and a large infiltration well will allow the recharge

Introduction to Algarve DEMO site, MARSOL project

Water quality and

main pressures

Electrical conductivity

negative influence of WWTP on surface WQ, as well as some contribution to groundwater in places near this stream

PROWATERMAN Project2012

PT2 Algarve, Rib. Meirinho

(Querença-Silves aquifer)

Introduction to Algarve DEMO site, MARSOL project

Nitrates

agriculture practices contribute with loads around 6 times higher than those from WWTP

Water quality and

main pressures

PROWATERMAN Project2012

PT2 Algarve, Rib. Meirinho

(Querença-Silves aquifer)

Introduction to Algarve DEMO site, MARSOL project

PT2_4 and 5 Algarve, WWTP SB Messines

• A MAR system for soil-aquifer-treatment (SAT) will be constructed to remove pollutants that still exist after the WWTP

• Soil-column lab facilities are being to study specific pollutants and their behaviour

• Soil-column experiments to analyse the pollutants retention capacity (June 2014/15)

• Different soils and mixtures, prior to SAT

NO3

-

NO2

-

NH4

+

PO4

3+

SO4

2-

E-coli

TH

B

Cu

Zn

103 farmaceuticals

Hydrus 1D is being used

Introduction to Algarve DEMO site, MARSOL project

PT2_6 Algarve, Cerro do Bardo

• Infiltration test in the large well (April 2014): infiltrationrate estimates provides an average value of 19.12 m/d

• Large Infiltration test with geophysics (Dec 2014)• Dike rehabilitation (Dec 2014)• Construction of monitoring infrastructures,

piezometer and well (2015)

Introduction to Algarve DEMO site, MARSOL project

PT3_7 Alentejo, Melides The aim is to use SAT to treat water contaminated from agriculture rice fields and from diffuse groundwater water pollution: improve groundwater quality Tests in LNEC artificial aquifer structure: visit

WHAT WE ARE DOING:

• Soil-column experiments to study specific pollutants and their behaviour

• LNEC artificial aquifer will be used to simulated soil-aquifer-treatment (SAT) to remove rice field pollutants prior to the discharge in Melides lagoon