energy guidelines for waste water treatment and water supply
TRANSCRIPT
www.aquabench.de
Energy Guidelines for Waste Water Treatment and Water Supply
Workshop on energy check KPI
June 24 & 25, 2014
Tunis, Tunisia
26.06.2014 / Seite 2 www.aquabench.de
aquabench is an water industry based management consultant
• 16 engineers and economists working
in Hamburg and Cologne, Germany
• Benchmarking is developed by the
German industry since 1996;
aquabench in 2003
• More than 800 participants
• aquabench online software used also
in French benchmarking
• Regional hub of European
Benchmarking Cooperation
• Member of IWA SG„Benchmarking
and performance assessment“ / ISO
TG “Benchmarking”
• Seven trainings for GIZ since 2010 /
Support of ACWUA TWG
“Benchmarking”
Hamburg
Cologne
26.06.2014 / Seite 3 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 4 www.aquabench.de
Programme (1st day)
Time Subject
09:00 Opening session
09:30 Scope of KPI system for energy checks in MENA water sector
10:30 Coffee break
11:00 Energy check water supply (performance indicators)
12:30 Lunch break
14:00 Energy check water supply (data variables)
15:30 Coffee break
16:00 Energy analysis water supply
17:30 Closure
26.06.2014 / Seite 5 www.aquabench.de
Programme (2nd day)
Time Subject
09:00 Opening session
09:30 Benchmarking energy efficiency
11:00 Coffee break
11:30 Energy check wastewater disposal (performance indicators)
13:00 Lunch break
14:30 Energy check wastewater disposal (data variables)
16:00 Coffee break
16:30 Energy analysis waste water disposal
17:30 Closure
26.06.2014 / Seite 6 www.aquabench.de
The main objective of this workshop is to identify the key energy
efficiency related performance indicators in water supply and for
waste water disposal. We will work on the deliverables below.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 7 www.aquabench.de
Lets get together!
What expectations do you have for the upcoming two days?
26.06.2014 / Seite 9 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 10 www.aquabench.de
We will develop a mutual understanding about the scope of the
energy check and the energy benchmarking.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 11 www.aquabench.de
Three methodological terms need to be clarified. They can be
distinguished by their different objectives.
• rough estimation of the energy efficiency by focusing on the relevant energy consuming aggregates
• seasonally
Energy check
• more detailed energy efficiency monitoring by focusing on main business process
• learning and adapting methods for best-practices from partner utilities
• annually
Energy benchmarking
• detailed energy efficiency study by establishing an energy balance
• evaluation of energy performance
• establish energy efficiency actions
• when needed
Energy analysis
26.06.2014 / Seite 12 www.aquabench.de
Both, the assessment level and the scope cover different areas.
level
utility
process
plant
aggre-gates
aspects
consum-ption
cost
product-ion
recovery
sources
reliabilty
26.06.2014 / Seite 13 www.aquabench.de
To get an idea about the possible scope see example of energy
efficiency KPI from a German bulk water supplier below.
Specific energy consumption per main business process
• total energy consumption per authorised consumption
• energy consumption
• water abstraction per m³ authorised
• water treatment per m³ authorised
• water transmission per m³ authorised
• water storage per m³ authorised
• support process per m³ authorised
Specific energy consumption main energy consumers
• energy consumption horizontal filter well per m³ abstracted
• energy consumption treatment plant per m³ raw water
• energy consumption main pumping station per m³ produced
• energy consumption booster pumps 1/2 per m³ pumped
• energy consumption low voltage busbar + main pumping station per m³ produced
• total gross CO2 emission
Specific energy production from energy recovery
• energy recovery turbine 1/2/3 per m³ at storage tank inlet 1/2/3
27 data variables, annually collected, main data sources are SCADA system and the bills from the energy supplier.
26.06.2014 / Seite 14 www.aquabench.de
The scope of the energy KPI used is on all levels of the utility but they
deal only with energy consumption and energy recovery.
level
utility
process
plant
aggre-gates
aspects
consum-ption
cost
product-ion
recovery
energy sources
reliabilty
26.06.2014 / Seite 15 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 16 www.aquabench.de
The main objective in this session is to develop a set of water supply
related energy KPI’s to be included in either energy check or
benchmarking methodology of the guidelines.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 17 www.aquabench.de
The set of proposed KPI‘s covers all levels and aspects of energy
discussed – but it is not complete.
• “Supermarket” of performance indicators.
• Let’s “shop” those that appeal relevant to you for a consideration in energy check and
energy benchmarking for water supply!
26.06.2014 / Seite 18 www.aquabench.de
For further preparation of the energy guidelines two questions
need to be discussed.
• Where do you see an implementation barrier?
• Please provide feedback on clue cards.
• Where do you see a need for definitions?
26.06.2014 / Seite 19 www.aquabench.de
We see a need in defining clear process boundaries within the
water supply value added chain.
Taken from DVGW Wasser-Information 77 (2010), DVGW, DBU, Bonn und Osnabrück
Water abstraction
Water treatment
Clean water storage Main
pumping
station
Drinking
water
storage
tanks
Customers
Water transmission and distribution
Booster stations
Water works facility
Drinking water production
26.06.2014 / Seite 20 www.aquabench.de
To have a sound foundation for energy checks, the data below
should be considered to collect on a regular basis.
26.06.2014 / Seite 21 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 22 www.aquabench.de
In the upcoming minutes we will determine the relevant energy
consumers in MENA water supply sector to be considered for the
energy balance of the energy analysis in the guidelines.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 23 www.aquabench.de
What energy consuming aggregates should be included to
establish the energy balance for the energy analysis?
Please check list for water supply!
26.06.2014 / Seite 24 www.aquabench.de
Brunnenkopf (BK)
30 mNN
2,9 bar
WG 16,8 kWh
WG 11,2 kWh
Eingang Wasserwerk (EWW)
35 mNN
2 bar
Wasseraufbereitung
10 kWh
WA 10 kWh
Ohne Aufteilung
Mit Aufteilung
6 bar
75 m³/h
16,8 kWh
Betriebswasserspiegel Brunnen (betrWSP)
0 mNN
WA 15,6 kWh
Energy balance without allocating a proportion of well pumps to
treatment:
• water abstraction: 16,8 kWh
• water treatment: 10 kWh
Energy balance with allocation:
• water abstraction
• water treatment
Only a proportion of the energy consumed by the well pumps is
utilised for water abstraction. This needs to be considered for the
energy balance.
kWh
kWh
mbarmmbar
barkWh
1,11
)34,01(8,16
))/0980665,0)030(9,2(
21(8,16
Operating water level
0 m.a.s.l.
75 m³/h
16,8 kWh
Well head
30 m.a.s.l.
2,9 bar
Raw water valve at intake
35 m.a.s.l.
2,0 bar
Water works
facility
10 kWh
kWh
kWhkWh
kWhmbarmmbar
barkWh
7,15
][10))34,0(8,16(
][10)))/0980665,0)030(9,2(
2(8,16(
Taken from aquabench benchmarking methodology
26.06.2014 / Seite 25 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 26 www.aquabench.de
Now the link between the energy check and an MENA water sector
energy efficiency benchmarking needs to be established.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 27 www.aquabench.de
A sound database of energy related reference values is a major reason
to introduce an MENA water sector energy benchmarking initiative.
Taken from DWA (2013), DWA-A 216, Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V., Hennef, Germany
Distribution
of values
(%)
26.06.2014 / Seite 28 www.aquabench.de
Benchmarking is a management tool focused on adaptation of
good practices
‘Benchmarking is the systematic and continuous process for the identification of becoming
acquainted with and adaptation of successful instruments, methods and processes from
benchmarking partners identified as being better.’ (DWA, DVGW 2008)
‘Benchmarking is a tool for performance improvement through systematic search and
adaptation of leading practices.’ (IWA 2011)
Source: DVGW/DWA “Benchmarking in Water Supply and Wastewater Supply” / IWA “Benchmarking Water Services”
26.06.2014 / Seite 29 www.aquabench.de
Besides the data base aspect , also learning from best practices is
an argument for an energy efficiency benchmarking.
non-quantifiable action
analysis:
quantifiable Action
non-modifiable proportion
… due to operating environment
theoretic
area for
improve-
ment
best-practice own
position prospective
Value
implement
actions
performance
assessment
performance
improvement
stakeholder
communication Source: DVGW/DWA “Benchmarking in Water Supply and Wastewater Supply” / IWA “Benchmarking Water Services”
26.06.2014 / Seite 31 www.aquabench.de
Action proposal 10
„Analyze Investment – Cost of Relining < DN 1200“
Initial:
Our cost/meter of relining are 250% above average
Goal:
Find reasons for high costs and develop action proposals
Effect on KPI:
[KBK345] Cost Sewage construction [€ / m]
Describe action proposal:
Contact regional benchmarkinng partner and research on
quality standard, way of tender process, involved external
firms
Date:
I. Quartal 2011
Contact person
Thomas xxx
Tel.: (099) 9998-99900
Email: [email protected]
Action proposals are a result of benchmarking
26.06.2014 / Seite 32 www.aquabench.de
More than 400 action proposals within seven years
> 400
action
proposals
Project No. of
participants Optimising areas
No. of action
proposals
Analysis 14
Investigation scope; sampling efficiency ;automation; work
load laboratories; procedures; outsourcing; quality
assurance
37
Indirect
discharger 17
Strategy (activities and frequencies); efficiency of
sampling and laboratories, staff qualification, price and
charges models
39
Sewer
operation 23
Camera and flushing technology; work time models; crew
strengths, cleaning intervals; vehicles and outside
management; work preparation and operational
management systems
92
Sewer pumping
stations 20
Modifications cleaning techniques; modifications cleaning
and inspection intervals; differentiation of inspection
activities; optimising of remote actions and energy
consumption
72
WWTPs 24
Per sub-process: investments in plant technology;
maintenance intervals; control systems; use of materials;
controlling; insourcing
over 200
Sewer
construction 13
Time recording software ;reduction of throughput times,
improvement of cost determination; coordination with
other service providers; standards of raw material;
manholes, shoring; award of contract practice
19
Material
management 12
Contract specifications; forecasts of market development,
modifications building cleaning; introduction of E-
procurement, , centralization, condition analysis toner; tie-
up of capital in stock
24
26.06.2014 / Seite 33 www.aquabench.de
Project Planning
Orientation, Training &
Project Control
Data Acquisition & Validation
Data Analysis & Assessment
Reporting
Improvement Actions
Review of Improvement
Actions
Preparation Performance Assessment Performance Improvement
Taken from IWA (2011)
Steps of benchmarking are well defined, supporting tools and
knowledge is in the region available
• Manuals on benchmarking have been
published in Germany (2005) and on
international level (2011)
• Various regional „benchmarking“ approaches
exist in MENA region
• Softwaretool for benchmarking is available
• ACWUA Benchmarking Technical Working
Group consolidates all “know –how” for the
MENA region
26.06.2014 / Seite 34 www.aquabench.de
Project Planning
Orientation, Training &
Project Control
Data Acquisition & Validation
Data Analysis & Assessment
Reporting
Improvement Actions
Review of Improvement
Actions
Preparation Performance Assessment Performance Improvement
Taken from IWA (2011)
.... but how to get started?
• Assessment system needs to be refined:
• Add more performance indicator to the
system
• Adress the question of context
information
• Clarify project organization
• Will ACWUA organize project?
• When? Who will participate?
• ...
26.06.2014 / Seite 35 www.aquabench.de
A single PI can be very misleading if you are lacking
additional information ….
26.06.2014 / Seite 36 www.aquabench.de
For a sound benchmarking context information should be
integrated to the energy performance indicator system.
“The interpretation of the performance of an undertaking cannot be carried out without taking into account the context in which it operates.”
Taken from Matos et al. (2003), Performance indicators for wastewater services, IWA publishing, London 2003
26.06.2014 / Seite 37 www.aquabench.de
Transparency is one reason to include context information.
A B
A B
Body fat in % 8 30
Hair colour black brown
Weekly sports
activity in hours 80 0
26.06.2014 / Seite 38 www.aquabench.de
The major reason to include context information is that they allow for
comparison within defined peer groups.
Cluster body fat < 10% Cluster body fat > 25%
26.06.2014 / Seite 39 www.aquabench.de
Project Planning
Orientation, Training &
Project Control
Data Acquisition & Validation
Data Analysis & Assessment
Reporting
Improvement Actions
Review of Improvement
Actions
Preparation Performance Assessment Performance Improvement
Taken from IWA (2011)
.... but how to get started?
• Assessment system needs to be refined:
• Add more performance indicator to the
system
• Adress the question of context
information
• Clarify project organization
• Will ACWUA organize project?
• When? Who will participate?
• ...
26.06.2014 / Seite 40 www.aquabench.de
Next step?
• Include idea of benchmarking in guidelines
• Clarify with ACWUA how to coordinate next steps (Workshop)
26.06.2014 / Seite 42 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 43 www.aquabench.de
The main objective in this session is to develop a set of wastewater
disposal related energy KPI’s to be included in either energy check
or benchmarking methodology of the guidelines.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking
26.06.2014 / Seite 44 www.aquabench.de
The set of proposed KPI‘s covers all levels and aspects of energy
discussed – but it is not complete.
• “Supermarket” of performance indicators.
• Let’s “shop” those that appeal relevant to you for a consideration in energy check and
energy benchmarking for waste water disposal!
26.06.2014 / Seite 45 www.aquabench.de
For further preparation of the energy guidelines two questions
need to be discussed.
• Where do you see an implementation barrier?
• Please provide feedback on clue cards.
• Where do you see a need for definitions?
26.06.2014 / Seite 46 www.aquabench.de
To have a sound foundation for energy checks, the data below should
be considered to collect on a regular basis for each WWTP.
• total plant
• aeration of activated sludge tank
• stirrer of activated sludge tanks
• pumps in water path
• pumps in sludge path
Energy consumption
• pollution load at plant intake
• ≥ 1 sample per month
• values have to be adjusted to each country
• if not measured at plant intake also back load due to dewatering sludge
Pollution load
• pumps in water path
• head
• volume
• pumps in sludge path
• head
• volume
Pumps
26.06.2014 / Seite 47 www.aquabench.de
1 Opening session
3 Energy check water supply
4 Energy analysis water supply
6 Energy check wastewater disposal
5 Benchmarking energy efficiency
2 Scope of KPI system for energy checks
7 Energy analysis wastewater disposal
26.06.2014 / Seite 48 www.aquabench.de
In the upcoming minutes we will determine the relevant energy
consumers in MENA wastewater disposal sector to be considered for
the energy balance of the energy analysis in the guidelines.
Assessment level
Assessment aspects
Scope energy check
Water supply KPI, definitions, collection guidelines Wastewater disposal KPI, definitions, collection guidelines
Energy check
Main energy consumers water supply
Main energy consumers wastewater disposal
Energy analysis
Database and best practice
Ideas how to get started
Set of context information
Bench-marking