05.04.2004 | Slide 1

Wastewater generation & treatment: the questionnaires and water accounting tables

Michael Nagy

05.04.2004 | Slide 2

Reporting of waste water data

Countrytype A

Eurostat / OECDJQ

EurostatWater Accounting

Eurostat / DG REGIOReg. Quest. DG ENV

UWWTD

DG ENV / EEAEPER

Other quest.….

Countrytype B

FAOWater Accounting

UNSDEnv. Quest.

Purpose for data collection?Reporting frequency?Coverage?Reporting threshold?Aggregation level?Definitions and terminology?Reporting authorities?…

05.04.2004 | Slide 3

First Question: What do we want to achieve with harmonisation?

Dataneeded

Country A

I II III …

Questionnaire I Other questionnairesQuestionnaire II

International level: Consistent data for multiple purposes

National level: One single set for reporting purposes – developed jointly by all relevant institutions

05.04.2004 | Slide 4

Dataneeded

Country A

I II III …

Questionnaire I Other questionnairesQuestionnaire II

International level: Consistent data for multiple purposes

National level: Complementary reporting by the different institutions

First Question: What do we want to achieve with harmonisation?

05.04.2004 | Slide 5

Country A

I II III …

Questionnaire I Other questionnairesQuestionnaire II

International level: different data flows, but harmonised definitions

National level: One single set for reporting purposes – developed jointly by all relevant institutions

First Question: What do we want to achieve with harmonisation?

05.04.2004 | Slide 6

Second question: Do we need complementary data collection?

Eurostat / OECDJQ

UNSDEnv. Quest.+ =

FAO

UNESCO…

Overlaps?Gaps?

05.04.2004 | Slide 7

UNSD/UNEP: Table W4A Waste Water Generation

Priority Category Unit 1990*

! Total waste water generated 1000 m3/d

by: Agriculture, forestry and fishing (ISIC 01-05) 1000 m3/d

Mining and quarrying (ISIC 10-14) 1000 m3/d

Manufacturing Industries (ISIC 15-37) 1000 m3/d

Production and distribution of electricity (ISIC 40) 1000 m3/d

Construction (ISIC 45) 1000 m3/d

Other economic activities 1000 m3/d

Households 1000 m3/d

05.04.2004 | Slide 8

Eurostat/OECD-JQ: Table 7: Generation and discharge of waste water

mio m³/y

mio m³/y* Mining and quarrying (10-14) mio m³/y* Total manufacturing industries (15-37) mio m³/y of which: foodprocessing industry (15) mio m³/y basic metals (27) mio m³/y transport equipment (35) mio m³/y textiles etc. (17-19) mio m³/y paper & paper products (21) mio m³/y chemical products & refined petroleum (23-24) mio m³/y* Production & distribution of electricity (401) mio m³/y* Construction (45) mio m³/y* All industrial activities (10-45) mio m³/y* Domestic sector (c) mio m³/y of which: Other activities (50-93) mio m³/y of which: households mio m³/yNON POINT SOURCES (d) mio m³/y

mio m³/y

Of which: * Agriculture, forestry, fishing (b)

ALL SOURCES

VOLUME WASTE WATER GENERATED (58) BY SOURCE AND BY SECTOR - POINT SOURCES (Total) (a)

Other units: BOD, SS, N tot, P tot, heavy metals

05.04.2004 | Slide 9

Comparison of WW Generation Tables W4A and 7

Breakdown to branches comparable UNSD/UNEP-Quest: volumes of WW only Open question: Is the definition of „waste water“ comparable?

Eurostat/OECD-JQ: Water which is of no further immediate value to the purpose for which it was used or in the pursuit of which it was produced because of its quality, quantity or time of occurrence. However, waste water from one user can be a potential supply to a user elsewhere. Cooling water is not considered to be waste water for purposes of this questionnaire.

UNSD/UNEP (2004-Quest):The quantity of water in cubic meters (m3) that is discharged due to being of no further immediate value to the purpose for which it was used or in the pursuit of which it was produced because of its quality, quantity or time of occurrence.

This definition of UNSD/UNEP covers also cooling water?!

05.04.2004 | Slide 10

Other observations

Definition of Urban Waste Water is comparable, Eurostat-OECD-JQ more precise (e.g. WW transported with trucks

Types of urban waste water treatment are not comparable: Eurostat /OECD: primary / secondary / tertiary UNSD/UNEP: mechanical / biological / advanced

Sludge production: Both Questionnaires: DS Eurostat / OECD: Splitted into urban / other / independent UNSD/UNEP:Total sludge production

05.04.2004 | Slide 11

Conclusion

Some of the definitions of UNSD/UNEP-Questionnaire are to be improved

Be careful with comparisons: WW treatment types Cooling water?

There is a high potential for developing one single information system available for world-wide comparison

Questionnaires are mainly from the environmental point of view – variables for humanitarian aspects (to be checked critically)?

If data is in bad quality – this may indicate need for improving of water management

05.04.2004 | Slide 12

Cyclic Procedure of Data Management

Water management and nat. statistics

Information needs

Data manag. strategy

Monitoring points / areas

Sample collection

(Laboratory) analyses

Data handling

Data analysis

Reporting

Information utilization

Cyclic procedure

Intern.Quest.

Int. Quest.