Water Services Training Group
Regional Training Centre,
Ballycoolin
June 28th 2011
Meeting the Challenges of the
Changed Economic Environment
Annual Conference September 2009
Integrated Constructed Wetlands
A Case Study, Glaslough, Co. Monaghan
Dan Doody
Senior Engineer (Retired)
Monaghan County Council
Meeting the Challenges of the
Changed Economic Environment
Annual Conference September 2009
Glaslough Location Map
Glaslough Village


ICW at Glaslough, Co. Monaghan
Glaslough

Why an Integrated Constructed
Wetland?
Glaslough

New Treatment Works Required
 Pre 2001 – ‘Combined’ collection system
delivered effluent to a 1940’s plant
(discharging to Glaslough Stream) overloaded. MCC prosecuted by ERFB
 Preliminary Report by Nicholas O’Dwyer
1989
350pe
IR£205k
Jan 2002
650pe
€950K
(2008
650pe
€1.5m)
Glaslough
2001 Discharge Pipework Extended
 Temporary FM Environmental Package
Plant (350pe) installed discharging to the
Mountain Water River

Glaslough/Castle Leslie ICW
May 2003 – Dr Rory Harrington, DEHLG
& Paul Carroll, Waterford Co Co (invited
by Billy Moore, Co Eng MCC) –
Presentation in Monaghan on ICWs
 Aug 2003 – Samantha Leslie, Dan
Doody & Mark Johnston MCC – Field trip
to Anne Valley in Waterford to view
working ICWs

Glaslough/Castle Leslie ICW
DEHLG Funding Measures
€635k
€1m

Small Schemes
pre 2007
post 2007

Major Schemes
pre 2007 over €635K
post 2007 over €1m
Glaslough/Castle Leslie ICW

Major Scheme Measures – Priority to
larger towns (Monaghan, Carrickmacross,
Castleblayney, Clones, & Ballybay)

Small Schemes Solution Sought –
Capital Cost less than €1m – ICW??
Glaslough/Castle Leslie ICW


Single major issue – Effluent Quality
Castle Leslie – Land Ownership,
Amenity Value & Use (related to
Castle/Hotel & Equestrian Centre)
Glaslough/Castle Leslie ICW

2004 – 2006 Design, Land Lease, Tree
felling, Part 8 Planning, Site
Investigation, Tender Docs.

Oct 2006 Construction commenced
(Contractor Eamon Sherry)
Glaslough/Castle Leslie ICW

Q2 – Q3 2007 Earthworks, Planting (by
Aila Carty, Vesi Environmental, Little
Island, Cork) Ductwork, Cabling,
Sampling & Monitoring Equipment)

26th Oct 2007 ICW Commissioned.

2008 Finishing Works, Riding Trails etc.
Glaslough/Castle Leslie ICW





Design
(Current Load
Footprint Area
Water Surface Area
Capital Cost
Meeting the Challenges of the
Changed Economic Environment
Annual Conference September 2009
1750pe
1400pe)
6.74ha
3.25ha
€770k
Costs for Glaslough ICW




Total cost including land
Less monitoring
Less exceptional costs,
riding trails, bridges etc
€770k
€144K
Net cost of wetland
€406k
€220k
Budget cost for conventional waste treatment
plant for 650pe is €1.5m
PLAN
OF
ICW
Glaslough ICW - POND 1
Glaslough ICW - POND 1
Glaslough ICW - POND 1
Glaslough ICW - POND 1
Glaslough ICW - POND 1
Right: Eamon De Butlier with Dr.
R. Harrington
Left: Minister Gormely visits
ICW, June 2008
PLAN
OF
ICW
Stroll from
Castle Leslie
to…
Integrated
Constructed
Wetland
Equestrians using
Riding Trails on
Embankments of
Ponds
Monitoring equipment.
SCADA layout of ponds
Performance of Glaslough ICW
Parameter
Influent
Effluent
UWWD*
(mg/l)
Removal
Efficiency (%)
(mg/l)
BOD5
997
6.4
99.4
25
COD
1444
45
97
125
TSS
2952
18
99.4
35
Total N
50
0.4
99.2
15
Total P
9.23
0.14
98.5
2
Ammonia
36.7
0.23
99.4
Nitrates
5.5
0.4
93
MRP
4
0.02
99.5
(mg/l)
NOTE: In the Consultation Paper on Environmental Objectives (Surface Water ) Regulations
2008 the level of Molybdate Reactive Phosphorus in river water body is 0.025 mgP/l for High
Status and 0.035 mg p/l for Good Status.
*UWWD = Urban Waste Water Directive
Discharges Glaslough ICW
‘The Pure Drop’ (Autumn 2010)
No Discharge (1 May 2011)
Quality of Receiving Waters
Glaslough ICW
Parameter
Mountain River
Influent
Effluent
Upstream
(mg/l)
(mg/l)
(mg/l)
Downstrea
m
UWWD
*
(mg/l)
(mg/l)
BOD5
997
6.4
2.35
2.39
25
COD
1444
45
29.74
29.33
125
TSS
2952
18
0.51
0.61
35
Total N
50
0.4
3.47
2.73
15
Total P
9.23
0.14
0.15
0.15
2
Ammonia
36.7
0.23
0.36
0.37
Nitrates
5.5
0.4
0.91
0.88
MRP
4
0.02
0.1
0.08
*UWWD = Urban Waste Water Directive
ICW Coliform Results (20/01/09)
CELL
NUMBER
SAMPLING
POINT
DATE
SAMPLED
ECOLI
(Fecal Coliforms)
per 100 mls
TOTAL
COLIFORMS
per 100 mls
ACCUMULATIVE
PERCENTAGE
OF
ICW AREA
Sludge pond
INLET
20-Jan-09
559950
>1209800
1.2
1
INLET
20-Jan-09
86640
>241960
15
2
INLET
20-Jan-09
20924
48392
29
3
INLET
20-Jan-09
292
1074
67.5
4
INLET
20-Jan-09
<10
63
96
5
OUTLET
20-Jan-09
<5
49
100
Mountain River
Upstream
RIVER
20-Jan-09
698
2897
Mountain River
Downstream
RIVER
20-Jan-09
429
2737.5
Leixslip raw water – total coliforms/100mls: Range 52 to 41,000 for 2008
– faecal coliforms/100mls: Range 8 to 17,200 for 2008
Comparison
ICW Glaslough (1750pe)
GLASLOUGH ICW
Parameter
v
Emyvale (2000pe)
EMYVALE STW
UWWD
Influent
mg/l
Effluent
mg/l
to river
Removal
efficiency
%
Influent
mg/l
Effluent
mg/l
Removal
efficiency
mg/l
Total N
46.6
1.42
97
73.75
16
78
15
Ammonia
37.83
0.29
99.2
10.7
2.7
75
-
Nitrates
8.15
0.33
96
6.15
10
-
-
Total P
7.33
0.03
MRP
5.02
0.01
99.8
6
4.99
17
-
COD
1377
47.14
96.6
687
86
87.5
125
TSS
4542
2.48
99.9
231
30.44
87
35
BOD
1147
5.12
99.6
389
25.5
94
25
*UWWD = Urban Waste Water Directive
2
Conclusion






The discharge from the ICW in Glaslough not only
complies with the UWWD but improves the quality of the
receiving waters.
Average removal efficiency for key parameters > 97 %
A consistently good effluent quality
Low operating and maintenance costs
Positive feedback from public & Castle Leslie
Keen interest (Nationally & Internationally) from Industry
Professionals
Contact Information
danjdoody@gmail.com
 Tel. 047 88811
 Mob. 087 6470832
