OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 1
INTERNATIONAL OFFICE FOR WATER
Wastewater generation & treatment statistics
Reliable statistics
Intersecretariat Working Group on Environment Statistics
Work Session on Water Statistics
(Vienna, 20-22 June 2005)
Benoît FRIBOURG-BLANC
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 2
INTERNATIONAL OFFICE FOR WATER
Wastewater : from generation to dischargeVarious pathways
UWWTP
Separate system
Combined system
Independent system
IWWTP
Stormwater overflow
UWWTP
Separate system
Combined system
Independent system
IWWTP
Stormwater overflow
Source : L’assainissement des grandes villes, RNDE, France, 1998
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 3
INTERNATIONAL OFFICE FOR WATER
Wastewater : from generation to discharge Wastewater loading scheme
4 steps Water quantity and transfers pollution quantity and transfers (non conservative) Equipments and performance
POINT SOURCES:
Agriculture
NON-POINT SOURCES:
• Run-off rainwater• Agriculture• Atmospheric deposition
WW 6.3WW 4.1
WW 5.2.2
WW 7.1
WW 4.2.2
WW 6WW 6.1
WW 5.2.1
UWWTP
WW 4.2.1
WW 7.2
Drainage from soils, direct transfers etc.
WW 5.2
WW 4.2
WW 5.1
WW 7Urban Waste Water CollectingSystem
Inland
Water
Rainwater run-off from paved area, infiltration and drainage intocollecting system
Industrial Activities •Mining and quarrying•Manufacturing Industry•Prod./Distr. Electricity•Construction
Domestic Sector•Other activities•Households
IWWP
Independenttreatment
Independent Waste Water CollectingSystem
SOURCES COLLECTING SYSTEMS TREATMENTS RECEIVING WATERS
WW_4
WW_5
SLUDGES
WW 6.2
POINT SOURCES:
Agriculture
NON-POINT SOURCES:
• Run-off rainwater• Agriculture• Atmospheric deposition
WW 6.3WW 4.1
WW 5.2.2
WW 7.1
WW 4.2.2
WW 6WW 6.1
WW 5.2.1
UWWTP
WW 4.2.1
WW 7.2
Drainage from soils, direct transfers etc.
WW 5.2
WW 4.2
WW 5.1
WW 7Urban Waste Water CollectingSystem
Inland
Water
Rainwater run-off from paved area, infiltration and drainage intocollecting system
Industrial Activities •Mining and quarrying•Manufacturing Industry•Prod./Distr. Electricity•Construction
Domestic Sector•Other activities•Households
IWWP
Independenttreatment
Independent Waste Water CollectingSystem
SOURCES COLLECTING SYSTEMS TREATMENTS RECEIVING WATERS
WW_4
WW_5
SLUDGES
WW 6.2
Source : Data Collection Manual for the OECD/Eurostat Joint Questionnaire on Inland Waters, Tables 1 – 7, June 2004
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 4
INTERNATIONAL OFFICE FOR WATER
Definitions for WastewaterProposed sources organisation
NACE/ISIC approach
Source : Data Collection Manual for the OECD/Eurostat Joint Questionnaire on Inland Waters, Tables 1 – 7, June 2004
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 5
INTERNATIONAL OFFICE FOR WATER
Definitions for WastewaterSome characteristics of sources
Only the agent that emit the pollution (avoid double counting)
Point, small point and diffuse sources
A link with NACE/ISIC
Process based vs Source based : NOSE
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 6
INTERNATIONAL OFFICE FOR WATER
Definitions for Wastewaterthe collection systems
The first part of the wastewater treatment system,
Many equipments,
Estimation of performance,
Reduced to connection rate,
Private part neglected,
Population served vs connected.
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 7
INTERNATIONAL OFFICE FOR WATER
Definitions for Wastewaterthe treatment
Definition / delimitation
Primary, Secondary and Tertiary treatment (JQ: design and real performance)
Investment - working costs / pollution destruction - transfers
Source : SANDRE-OIEau 1997
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 8
INTERNATIONAL OFFICE FOR WATER
Definitions for Wastewaterthe pollution
the direct or indirect introduction, as a result of human activity, of substances or heat into the air, water or land which may be harmful to human health or the quality of aquatic ecosystems or terrestrial ecosystems directly depending on aquatic ecosystems, which result in damage to material property, or which impair or interfere with amenities and other legitimate uses of the environment. (EU Water Framework Directive)
Parameters and substances
Geographical and temporal
Available classification systems (CAS, ELINCS, EINECS)
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 9
INTERNATIONAL OFFICE FOR WATER
data collection for Wastewaterthe raw data
Temporal and geographical variations,
High influence of processes and human activities,
Multiple pathways
Reliable monitoring (continuous, quality check…)
High cost of monitoring,
combination of monitoring and calculating
(formula, emission factors, models, experts)
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 10
INTERNATIONAL OFFICE FOR WATER
data collection for Wastewaterdata aggregation
A wide use of thresholds : reliable individual data,
A need to complete the picture,
A need to aggregate for international statistics,
Geographical or temporal aggregation (frequency, quality),
Wide use of all possible methods from monitoring to modelling
OfficeInternationalde l'Eau
Water Statistics, Vienna, 20-22 June 2005 slide 11
INTERNATIONAL OFFICE FOR WATER
Wastewater generation and dischargeThe main conclusions
Reliability is crucial for priority setting
Completeness vs confidence
shared terminology (definitions, data format, nomenclature)
EN 1085:1997 wastewater treatment
Not only monitoring but also design capacity, emission factors and other estimations.
