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 6.3

WW 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 7

Urban 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 6.3

WW 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 7

Urban 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.