Transcript Compliance Check - United Nations Statistics Division

Wastewater generation & treatment: the
questionnaires and water accounting tables
Michael Nagy
05.04.2004 | Slide 1
Reporting of waste water data
Eurostat / OECD
JQ
Eurostat / DG REGIO
Reg. Quest.
Eurostat
Water Accounting
Purpose for data collection?
Reporting frequency?
Coverage?
Reporting threshold?
Aggregation level?
Definitions and terminology?
Reporting authorities?
…
Country
type A
Country
type B
DG ENV
UWWTD
DG ENV / EEA
EPER
Other quest.
….
UNSD
Env. Quest.
FAO
Water Accounting
05.04.2004 | Slide 2
First Question: What do we want to achieve
with harmonisation?
Questionnaire I
Questionnaire II
Data
needed
I II III …
Country A
Other questionnaires
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 3
First Question: What do we want to achieve
with harmonisation?
Questionnaire I
Questionnaire II
Data
needed
I II III …
Country A
Other questionnaires
International level: Consistent
data for multiple purposes
National level:
Complementary reporting by
the different institutions
05.04.2004 | Slide 4
First Question: What do we want to achieve
with harmonisation?
Questionnaire I
Questionnaire II
Other questionnaires
International level: different
data flows, but harmonised
definitions
I II III …
Country A
National level: One single set
for reporting purposes –
developed jointly by all
relevant institutions
05.04.2004 | Slide 5
Second question: Do we need complementary
data collection?
Eurostat / OECD
JQ
Overlaps?
Gaps?
+
UNSD
Env. Quest.
=
FAO
…
UNESCO
05.04.2004 | Slide 6
UNSD/UNEP: Table W4A Waste Water
Generation
Priority
!
Category
Total waste water generated
by: Agriculture, forestry and fishing
(ISIC 01-05)
Unit
1990*
1000 m3/d
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 7
Eurostat/OECD-JQ: Table 7: Generation and discharge
of waste water
VOLUME
WASTE WATER GENERATED (58) BY SOURCE AND BY SECTOR POINT SOURCES (Total) (a)
Of which:
* Agriculture, forestry, fishing (b)
* Mining and quarrying
* Total manufacturing industries
of which: foodprocessing industry
basic metals
transport equipment
textiles etc.
paper & paper products
chemical products & refined petroleum
* Production & distribution of electricity
* Construction
* All industrial activities
* Domestic sector (c)
of which: Other activities
of which: households
NON POINT SOURCES (d)
ALL SOURCES
Other units: BOD, SS, N tot, P tot, heavy metals
mio m³/y
(10-14)
(15-37)
(15)
(27)
(35)
(17-19)
(21)
(23-24)
(401)
(45)
(10-45)
(50-93)
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
mio m³/y
05.04.2004 | Slide 8
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
05.04.2004 | Slide 9
water?!
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 10
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 11
Cyclic Procedure of Data Management
Intern.
Quest.
Water management and nat. statistics
Information needs
Information utilization
Data manag. strategy
Reporting
Cyclic
procedure
Monitoring points / areas
Sample collection
Data analysis
Data handling
Int.
Quest.
(Laboratory) analyses
05.04.2004 | Slide 12