aiguamolls artificials per a la depuraciÓ d’efluents lÍquids
TRANSCRIPT
AIGUAMOLLS ARTIFICIALS PER A LA DEPURACIÓ D’EFLUENTS LÍQUIDS
Aiguamolls artificials per a la depuració de lixiviats de l’horticultura fora de sòl
(Cabrils, 18 de novembre de 2013)
Joan García (UPC, Barcelona)
Objective
To present recent developments and points of view in constructed wetlands
Koh Phi Phi, Thailand
Primary treatment
(septic tank)
Secondary treatment
(horizontal constructed wetlands)
Pretreatment
(screening)
CONSTRUCTED WETLANDS: conventional setup
Verdú, Lleida, España Verdú, Lleida, Spain
Year
TSS (mg/L)
BOD5 (mg/L)
In Out In Out
2003 200 (140) 10 (8) 120 (77) 5 (2)
2004 150 (60) 19 (11) 88 (29) 9 (5)
2005 250 (340) 22 (20) 230 (190) 16 (12)
2006 110 (80) 15 (10) 110 (40) 12 (6)
2007 330 (270) 24 (12) 250 (120) 15 (7)
2008 270 (170) 20 (20) 230 (120) 11 (6)
Small communities
• Low levels of dissolved oxygen
• No nitrification
• Potential for H2S formation, GHG emissions
CONSTRUCTED WETLANDS: conventional setup
García et al. (2004)
C2-August
Location
Influent
1 2 3 Effluent
SO
42-, m
g/L
0
50
100
150
200C2-December
Location
Influent
1 2 3 Effluent
C2-June
SO
42-, m
g/L
0
50
100
150
200
250C2-July
D2-August
Location
Influent
1 2 3 Effluent
SO
42-, m
g/L
0
50
100
150
200D2-December
Location
Influent
1 2 3 Effluent
D2-June
SO
42-, m
g/L
0
50
100
150
200
250D2-July
In 1 2 3 Out
The cartridge
Clogged zone
Active zone
The cartridge
Modified from Knowles et al. (2013). Ecol. Eng.
Clogged zone Active
zone
The cartridge
Modified from Knowles et al. (2013). Ecol. Eng.
Clogged zone Active
zone
The cartridge
Modified from Knowles et al. (2013). Ecol. Eng.
Clogged zone Active
zone
The cartridge
Modified from Knowles et al. (2013). Ecol. Eng.
CONSTRUCTED WETLANDS: vertical flow development
Brix and Arias (2005)
J.J. Salas
Molle et al. (2005)
CONSTRUCTED WETLANDS: recent developments
Concept of integrated treatment in constructed wetlands
1. Urban wastewater
2. Runoff (overflows)
3. Sludge
4. Reuse
Carrión de los Céspedes, Seville, Spain (Center for New Water Technologies)
Horizontal
subsurface
flow
Vertical flow
Free water
surface flow
Imhoff tank
317 m2
229 m2
240 m2
Phragmites australis
Average flow ~ 14 m3/d
OLR ~ 9.6 g BOD5/m2.d
Wastewater treatment line
Sludge treatment line
Area: 20 m2
Loading regime: 1 time/month
Around 42 kg TS/m2.year
Water tank for water reuse
Receives water from the effluent of constructed wetlands for its reuse Capacity: 20 m3
CONSTRUCTED WETLANDS: integrated wetland system
Treatment unit
Influent Imhoff VF HSSF FWSWater tankE.
Coli
(log
10 u
nits U
FC
/100 m
L)
0
2
4
6
8
10
12
• Its quality fulfills the Spanish guidelines for:
- Recharge of aquifers by percolation through the ground
- Irrigation of green areas non accessible to the public
- Silviculture
Goals of the treatment 1. Produce water with reuse quality
2. Robust systems to treat combined sewer discharges
CONSTRUCTED WETLANDS: integrated wetland system
Reliability of the system to a storm event of 45 mm in 1 hour (Q= 2,5Qd,avg)
FWS
Time (h)
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Co
nce
ntr
atio
n (
mg L
-1)
0
10
20
30
40
50
60TSS
VS
COD
NH4-N
NOx-N
Time (min)
0 30 60 90 120 150 180 210 240 270 300 330 360
Solid
s (
mg L
-1)
0
200
400
600
800
1000TSS
VS
Ávila et al. (2013) Diclofenac
Ibuprofen Acetaminofen Tonalide
Triclosan
Bisphenol A
WATER TANK
CONSTRUCTED WETLANDS: integrated wetland system
mgCOD l-1
HETEROTROPHIC BACTERIA
FERMENTING BACTERIA
1 year 2 years 3 years
MANUAL PARA LA IMPLANTACIÓN DE SISTEMAS DE DEPURACIÓN EN
PEQUEÑAS POBLACIONES. CEDEX-CENTA García, J y Corzo, A. (2009). Depuración con humedales construidos: guía
práctica de diseño, construcción y explotación de sistemas de humedales de flujo subsuperficial. Descarga gratuita en https://upcommons.upc.edu/e-prints/handle/2117/668
Groupe Macrophytes et Traitement des Eaux (2005). Épuration des eaux usees
domestiques par filtres de plantes de macrophytes. Descarga gratuita en http://www.eaurmc.fr/documentation/files/Guide%20Macrophytes.pdf
Kadlec, R.H. y Wallace (2008). Treatment Wetlands. CRC Press, Florida.
REFERENCES
